Compact. performance. Threaded Safety Relief Valves. Series 437 Type Series 459 Type CATALOG.

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1 Compact performance Threaded Safety Relief Valves Series 437 Type Series 459 Type CATALOG The Safety Valve

2 Series 459 Packed lever H4 Series 459 Balanced bellows design Series 459 Cap H Series 459 Flanged version Series 459 Plain lever H3

3 Contents Contents General Applications 5 Features and Benefits 5 Codes and Standards 5 Overview 6 Series Materials 0 How to Order Numbering System Article Numbers 4 Available Connections 5 Dimensions and Weights 6 Pressure Temperature Ratings 8 Accessories and Options Caps and Levers 0 Metal Seat Soft Seal Heating Jacket 4 Spare Parts 5 Approvals Series Capacities Type Capacities Type 438 / Specification Sheet 3 Series Materials 34 How to Order Numbering System 40 Article Numbers 4 Available Connections 43 Dimensions and Weights 44 Pressure Temperature Ratings 46 Accessories and Options Caps and Levers 48 Balanced Bellows 50 Metal Seat 5 Soft Seal 5 Heating Jacket 54 Lift Indicator 55 Spare Parts 56 Approvals Series Capacities Series Specification Sheet 6 Series 437 Cap H Series 437 Packed lifting device H4 Series 437 Flanged version LWN

4 General LESER s compact performance valves are spring loaded safety relief valves of specially compact design, developed in close cooperation with plant engineers and service specialists to protect special processes and installations against overpressure. Extensive testing at the LESER ASMEcertified test lab together with up to date manufacturing processes ensure LESER s compact performance valves are designed and manufactured to highest standards and compliant with and approved according to ASME (Sec. VIII, Div. ), the Canadian CRN, the European PED standard (CE), the German AD 000- Merkblatt A and those of many other countries, covering requirements from end-users, OEM s and engineering companies worldwide. the reliability of these state of the art products. Type 437 / 438 / 439 Type 459 / 46 4 LWN 47.0

5 Applications Features and Benefits Codes and Standards Applications LESER s compact performance valves represent the ultimate solution for critical applications such as Air/gas compressors and pumps Technical gases and CO plants Chemical equipment and piping Pressure vessels and piping systems containing gas, air, liquid or steam LPG/LNG terminals, carriers etc. Cryogenic systems and oxygen application Thermal relief Features and Benefits LESER s compact performance valves cover a large variety of types, materials and options to fit any application: Scope of Design Four valve sizes from / through / Four orifice sizes from 0.3*D through F Threaded or flanged connections ANSI or DIN, Inlet rating: class 50# to 500# Standard metal sealing: Type 437 and Type 459 or Soft seal: Type 438, 439 and 46 Optional stainless steel bellows for back pressure compensation Packed or plain lifting lever or gastight cap Heating jacket available for high viscosity fluids Compact design and High Performance Single trim for steam, gas and liquid for less spare parts and easier maintenance Broad set pressure range up to 600 psig Self-draining body design, avoids residues and reduces corrosion One-piece spindle reduces friction Unobstructed seat bore for maximum capacity compared to nominal size Heavy duty design Type 459M Various materials: chrome steel, stainless steel, Monel or Hastelloy All parts machined from bar stock for complete valves from special materials within short time Variety of capacities and versions, multiple choice of connections to fit any application Ease of plant design, installation, operation and maintenance Replaceable nozzle and disc Hardened or optional stellited metal sealing for longer product life Soft seat for superior tightness Ringless design, no adjustments Codes and Standards LESER s compact performance valves comply with the following codes and standards: ASME Section VIII National Board certified capacities (single trim for steam, gas and liquid service): UVstamp ASME Section II - materials ASME B 6.34 and ASME B6.5 API 57, NACE MR 075 CRN EN ISO 46- PED 97/3/EC (CE-marking), VdTUEV-SV 00, AD 000-Merkblatt A Others LWN

6 General Overview Overview Series 437 Series 459 Type 437: Metal to metal seat Type 438: Soft seal, o-ring Type 439: Soft seal, vulcanized Common Features Very compact design Medium capacity Two standard body materials: chrome steel, stainless steel All parts machined from bar stock various material options available Various connections The diagram gives a quick overview about the main features of LESER s compact performance valves: capacity and tightness. Type 459: Metal to metal seat Type 46: Soft seal, o-ring Common Features Compact design High capacity compared to nominal sizes: for most common valve size 3/4 x up to.5*d-orifice capacity Four different orifice sizes available Wide range of set pressures Optional balanced bellows Three body materials: cast iron, carbon steel, stainless steel Various connections Tightness Series 437 Series 459 Type 439 Vulcanized soft seal Type 438 Type 437 O-ring disc Sealing plate Type 46 Type 459 O-ring disc Sealing plate Type 437 Metal to metal Type 459 Metal to metal Capacity / Selection of Threaded Safety Relief Valves Set Pressure Criteria > 700psig > 6000psig D F Flanged SRV e.g. 56 High Flow Capacity is required Thermal Expansion application Soft Seats Metal Seats Temperature > 536 F Temperature < -50 F Variable Back Pressure occurs Threaded Connections are required Flanged Connections are required Note: Disc with sealing plate (e.g. PTFE) is available. Series Type 6 LWN 47.04

7 General Overview Metal to metal seat Type 437 and 459 provide for the protection of installations where the metal to metal seat with its wide temperature range and good chemical resistance is suitable. Set Pressure [psig] Type 437 and 459 can be equipped with an optional sealing plate disc for low temperature soft seat applications inch inch 437 Long Version 0. inch 437 Standard Version 0. inch inch inch Capacity/ Metal to metal seat Type 437 Capacity Set pressure Sealing Design 0.5*D up to 60 psig metal to metal very compact Type 459 Capacity Set pressure Sealing Design 0.3*D through F up to 600 psig metal to metal compact, optional bellows, heavy duty design 459M LWN

8 General Overview Soft seal Type 438, 439 and 46 provide for the protection of installations where a soft seat for superior tightness is required like for hard to hold gases. Type 439 allows maintained tightness close to the set pressure especially at lower set pressures due to the advanced design of the vulcanized soft seat. Set Pressure [psig] inch 438 Long Version 0. inch 438 Standard Version 0. inch inch inch inch Capacity/ Soft seal Type 438 Capacity Set pressure Sealing Design 0.5*D up to 60 psig soft seal, O-ring very compact Type 439 Capacity Set pressure Sealing Design 0.5*D up to 3 psig vulcanized soft seal very compact Type 46 Capacity Set pressure Sealing Design 0.75*D through F up to 5075 psig soft seal, O-ring compact, optional bellows 8 LWN 47.06

9 Series 437 Series 437 Type 437 / 438 / 439 Type 437 / 438 / 439 Flanged Version LWN

10 Series 437 Threaded Safety Relief Valves Spring Loaded Materials Type 437 Materials Type Item Part Name Type 4373 Chrome Steel Type 4374 Stainless Steel 8 9 Inlet body SA 479 Outlet body SA Disc Hardened stainless steel Spindle AISI 40 6 / 7 Spring plate AISI 430F SA 479 SA Adjusting screw AISI 430F with bushing PTFE PTFE 9 Lock nut Steel 40 Cap H Steel Spring Pin Stainless steel Stainless steel Stainless steel Stainless steel 6 Ball Hardened stainless steel 36 Flanged Version Inlet body SA 479 SA 479 Outlet body SA SA 479. Outlet adaptor. Outlet flange 48 Inlet flange Type Type 437 Flanged version 0 LWN 47.08

11 Materials Type 438 Type 439 Materials Type 438 Type 439 Item Part Name Type 4383 Type 4393 Chrome Steel Inlet body SA 479 Outlet body SA Disc with soft seal Spindle AISI 40 6 / 7 Spring plate AISI 430F Type 4384 Type 4394 Stainless Steel SA 479 SA Adjusting screw AISI 430F with bushing PTFE PTFE 9 Lock nut Steel 40 Cap H Steel 54 Spring Stainless steel Stainless steel 57 Pin Stainless steel Stainless steel 6 Ball Hardened stainless steel Flanged Version Inlet body SA 479 SA 479 Outlet body SA SA 479. Outlet adaptor. Outlet flange 48 Inlet flange Notes: CR Neoprene NBR Nitrile EPDM Ethylene / Propylene FPM Fluorocarbon FFKM Kalrez (Type 438) ISOLAST (Type 439) Type 438 O-ring seal 40 8 Item 7 only Type Type 439 Vulcanized soft seal Type 438 Flanged version LWN 47.09

12 Series 437 Threaded Safety Relief Valves Spring Loaded How to Order Numbering System How to Order Numbering System 3 Article Number Set Pressure Connections Type 437 / 438 / 439 Please state unit (in gauge)! Please do not exceed pressure range mentioned in the spring charts. Please refer to table Available Connections on page 5. Please state one option code for each, inlet and outlet. Types of sealing Metal seat Metal-to-metal Metal-to-metal stellited Soft seat EPDM NBR CR FFKM (Kalrez ) FKM (Viton ) Plastic seat SP Vespel-SP PCTFE Kel-F PTDE-FDA Teflon 437 Type Material Code 3 Body Material Chrome Steel 4 Body Material Stainless Steel Valve Code Identifies valve size, body material and orifice, refer to page 4. Code for lifting device Screwed cap H 4 Packed lever H psig V6 V7 Article No. Set Pressure Connections LWN 47.0

13 How to Order Numbering System Options Documentation Code and Medium Type 437 / 438 / 439 Inlet body stellited (Type 437 only) Option Code L0 Soft seal material (Type 438 / 439 only) NBR N J30 EPDM F J CR K J FKM L J3 FFKM C J0 Heating jacket H9 Please select requested documentation: Material test certificate DIN EN Parts Inlet body Outlet body Bonnet Cap/ lever cover Disc Option Code H0 L34 L30 L3 L3. Code. ASME Section VIII. CE / VdTUEV 3. ASME Section VIII + CE / VdTUEV Medium. Gases. Liquids.3 Steam.0 Steam/ Gases/ Liquids (valid only for CE / VdTUEV) L0 H0 L30. Options Documentation Code and Medium LWN 47. 3

14 Series 437 Threaded Safety Relief Valves Spring Loaded How to order Article Numbers How to order Article Numbers Type 437 Type [Inch ] Set Pressure Range [psig] Body Material Chrome Steel SA Cap H Packed Lever H4 Set Pressure Range [psig] Body Material Stainless Steel SA 479 Cap H Packed Lever H4 Type 437 standard version Type long version Article Numbers Type 438 Type [Inch ] Set Pressure Range [psig] Body Material Chrome Steel SA Cap H Packed Lever H4 Set Pressure Range [psig] Body Material Stainless Steel SA 479 Cap H Packed Lever H4 Type 438 standard version Type long version Article Numbers Type 439 Type [Inch ] Set Pressure Range [psig] Body Material Chrome Steel SA Cap H Packed Lever H4 Set Pressure Range [psig] Body Material Stainless Steel SA 479 Cap H Packed Lever H4 Type 439 standard version Note: The long version is a high pressure version with extended outlet body. 4 LWN 47.

15 How to Order Available Connections Available Connections Threaded ASME ANSI B.0. Inlet Outlet Male NPT Female NPT Female NPT Size Option Code Size Option Code Size Option Code / V6 / V58 / V70 3 /4 V6 3 /4 V59 3 /4 V77 V63 V60 V7 Male thread Available Connections Flanged ASME ANSI B6.5 Size / 3 /4 Inlet ANSI-Class Option Code 50 V V0 V V04 50 V V V V08 50 V V V 500 V Size / 3 /4 Notes: Maximum inlet flange class: #500 Extended center to face dimension outlet: 4 3 /4 (0 mm) Outlet ANSI-Class Option Code 50 V V3 900 V4 50 V V6 900 V7 50 V V9 900 V0 Female thread Different sizes and flange classes inlet and outlet can be combined. Standard flange facing is raised face (RF) according to ASME ANSI B6.5. RJ flange facing as well as other facings are available. Flanged version LWN

16 Series 437 Threaded Safety Relief Valves Spring Loaded Dimensions and Weights Threaded / Flanged Connections US Units a s b s Male thread Female thread Flanged version Dimensions and Weights Threaded Connections US Units Connection Size [Inch] / x / / x 3 /4 3 /4 x 3 /4 3 /4 x x Note: only Type 437 / 438 [Inch ] 0. Center to Face [Inch] Height [Inch] Weight [lbs] Inlet Outlet Standard Long Version Male Female a c a b H max. H max. m 9 /64 55 /64 3 /4 3 / / /8 9 /64 55 /64 3 /4 7 / / /8 9 /64 55 /64 3 /4 7 / / / /64 55 /64 53 /64 7 /6 8 /3 9 3 /64 3 /64 /8 53 /64 7 /6 8 3 /6 9 4 /64 Dimensions and Weights Flanged Connections US Units Connection Size [Inch] Notes: only Type 437 / 438 for / ANSI 50: 3 5 /6 [Inch ] Center to Face [Inch] inlet a outlet b Class 50 s Flange Thickness [Inch] Class 300 / 600 s Class 900/ 500 s / /6 5 /6 3 / / /6 /6 /4 3 /4 /8 9 /6 Class 500 s 7 /6 9 /6 5 /8 Standard H max. Height [Inch] Long Version H max. Weight [lbs] m 0 7 /6 7 / LWN 47.4

17 Dimensions and Weights Threaded / Flanged Connections Metric Units Dimensions and Weights Threaded Connections Metric Units Connection Size [Inch] / x / / x 3 /4 3 /4 x 3 /4 3 /4 x x Note: only Type 437 / 438 [mm ] 78.5 Center to Face [mm] Height [mm] Weight [kg] Inlet Outlet Standard Long Version Male Female a c a b H max. H max. m Dimensions and Weights Flanged Connections Metric Units Connection Size [Inch] / 3 /4 [mm ] Center to Face [mm] inlet a outlet b Class 50 s Flange Thickness [mm] Class 300 / 600 s Class 900 / 500 s Class 500 s Standard H max. Height [mm] Long Version H max. Weight [kg] m Notes: only Type 437 / 438 for / ANSI 50: 00 mm LWN

18 Series 437 Threaded Safety Relief Valves Spring Loaded Pressure Temperature Ratings Type 437 / 438 / 439 US Units Pressure Temperature Ratings Type 437 US Units Valve Size Set Pressure Range [psig] [Inch ] Body Material Standard Version Long Version Temperature Range according to ASME [ F] / 0. min. max. min. max. min. max. Chrome Steel / 0. Stainless Steel Pressure Temperature Ratings Type 438 US Units Valve Size Set Pressure Range [psig] [Inch ] Body Material Standard Version Long Version Temperature Range according to ASME [ F] / 0. min. max. min. max. min. max. Chrome Steel / 0. Stainless Steel Pressure Temperature Ratings Type 439 US Units Valve Size [Inch ] Body Material Set Pressure Range [psig] Standard Version Temperature Range according to ASME [ F] / 0. min. max. min. max. Chrome Steel / 0. Stainless Steel Notes: For flanged versions the pressure temperature rating acc. to ANSI B 6.34 may supersede these limits The temperature is limited by the soft seal material, please refer to soft seal selection table on page 3. 8 LWN 47.6

19 Pressure Temperature Ratings Type 437 / 438 / 439 Metric Units Pressure Temperature Ratings Type 437 Metric Units Valve Size Set Pressure Range [bar] [mm ] Body Material Standard Version Long Version Temperature Range according to ASME [ C] / 78.5 min. max. min. max. min. max. Chrome Steel / 78.5 Stainless Steel Pressure Temperature Ratings Type 438 Metric Units Valve Size Set Pressure Range [bar] [mm ] Body Material Standard Version Long Version Temperature Range according to ASME [ C] / 78.5 min. max. min. max. min. max. Chrome Steel / 78.5 Stainless Steel Pressure Temperature Ratings Type 439 Metric Units Valve Size [mm ] Body Material Set Pressure Range [bar] Standard Version Temperature Range according to ASME [ C] / 78.5 min. max. min. max. Chrome Steel / 78.5 Stainless Steel Notes: For flanged versions the pressure temperature rating acc. to ANSI B 6.34 may supersede these limits. The temperature is limited by the soft seal material, please refer to soft seal selection table on page 3. LWN

20 Series 437 Threaded Safety Relief Valves Spring Loaded Accessories and Options Caps and Levers Accessories and Options Caps and Levers Series 437 is available with the following lever designs Cap H Packed lever H4, threaded design Materials subassembly Item 40 Body Material Chrome Steel Body Material Stainless Steel The packed lever H4 provides some special features: operation by turning the knob anticlock wise remains in open position until the knob is screwed down again open and closed position is indicated Item Component Cap H Packed lever H4 Cap H Packed lever H4 Lever cover Cap Knob Spindle cap 3 Bolt 4 Support ring 6 Pin 9 O-ring Stopper 3 Seal 4 Seal wire 5 Sealing nose Steel Plastic 36SS AISI 430F AISI 430F AISI 40 36SS 36SS Stainless Steel Viton AISI 430F Plastic 36SS Plastic 36SS 36SS 36SS Stainless Steel Viton Plastic 36SS Open Closed Cap H Packed lever H4 0 LWN 47.8

21 Accessories and Options Metal Seat Metal Seat (Type 437) The LESER metal seats (disc and nozzle) are lapped to optical flatness to ensure a tight shut off. LESER safety relief valves are supplied with a standard leak tightness according to API 57. Type 4373 Standard material for the disc is a hardened stainless steel. The combination of a hard disc material and a softer seat material () provides for improved wear resistance and longer product life. Type 4374 Disc and seat are provided in material for highest corrosion resistance. Any other material which is available from bar stock can be supplied as well (e.g. Hastelloy, Monel, Alloy0, ) Metal seat Stellited sealing surfaces Disc Materials subassembly Item 7 Item Item Part Name Type 4373 Body Material Chrome Steel Type 4374 Body Material Stainless Steel Hardened Disc stainless steel Hardness HRC Lifting aid AISI 430F Nut Steel Pin Part Name Optional stellited sealing surfaces Stellited sealing surfaces For high temperature applications, or applications with abrasive fluids wear resistant sealing surfaces are recommended. The sealing surfaces of the disc, seat or nozzle can be stellited by build-upwelding. The minimum thickness of the stellite is 0.06 inch. In addition to the corrosion resistance, the stellited surface also offers a high resistance to impact and sudden changes in temperature. 7. Disc Inlet Body stellited Hardness HRC stellited Hardness HRC LWN 47.9

22 Series 437 Threaded Safety Relief Valves Spring Loaded Accessories and Options Soft Seal Soft Seal O-ring disc (Type 438) Vulcanized soft seal (Type 439) Disc with sealing plate (Type 437, optional) Code letter Code letter Code letter O-ring disc Type 438 Vulcanized soft seal disc Type 439 Disc with sealing plate Type 437 Application Type 437, 438 and 439 are provided with a soft seal disc for superior tightness maintained tightness close to the set pressure Features and Benefits three different designs for extended application range minimized leakage and product loss large selection of soft seal materials simple replacement of soft seal standard ARP o-ring sizes one standard durometer per o-ring material reduced maintenance costs Disc with vulcanized soft seal Type 439 with a vulcanized soft seat allows maintained tightness close to the set pressure especially at lower set pressures. Disc with sealing plate For applications, where the increased tightness of a soft seal is required but the temperature is too low or too high for an o-ring-disc, e.g. liquefied gases. Note: Code letter: Please refer to soft seal selection table For temperature limits and medium resistance refer to the soft seal selection table. Materials subassembly Item 7 Item Type 438 O-ring disc Type 439 Vulcanized soft seal disc Type 437 Disc with sealing plate Part Name Material Part Name Material Part Name Material 7. Disc Disc with vulcanized soft seal, refer to soft seal selection table Disc 7. Lifting aid Lifting aid Lifting aid 7.3 O-ring Refer to soft seal selection table 57 Pin Nut Pin 36 Sealing plate Pin Refer to soft seal selection table 36 LWN 47.0

23 Accessories and Options Soft Seal Soft Seal Selection Type 438 O-ring, Type 439 Vulcanized soft seal Abbrevation ASTM 48 CR NBR EPDM FPM (FKM) Designation Trade name Neoprene (Chloroprene) Buna-N (Nitrile-Butadiene) Buna - EP (Ethylene-Propylene - Diene) Viton (Fluorocarbon) FFKM 3 Kalrez (Perfluoro) Codeletter Option Code [ F] [ F] K J N J D J L J C J0 3 T min [ C] 0 48 T max [ C] Application Paraffin oil, silicone oil and grease, water and waterbased solvents, refrigerants, ozone Hydraulic oil, vegetable and animal grease and oil Hot water and superheated steam up to 30 F, several organic and inorganic acids, silicone oil and grease, FDA compliant For high temperature service (no superheated steam), mineral oil and grease, silicone oil and grease, vegetable and animal grease and oil, ozone, FDA compliant compound available on request Nearly all chemicals, standard compound is Kalrez 6375 with steam resistance, FDA compliant compound available on request Type 437 Sealing plate SP PCTFE VESPEL SP- (Polyimide) Kel-F (Polychlorotrifluoroethylene) T G J49 J High temperature and high pressure applications (no steam), for chemical resistance refer to manufacturers guide Cryogenic and refrigeration application, flammable media, gaseous oxygene application up to 75 psig at 40 ºF Teflon PTFE (Polytetrafluoroethylene) A J Nearly all chemicals Other Please contact LESER LLC Notes: The code letters will be stamped on the disc. For soft seal materials other than listed the code letter X will be used. Pressure and temperature service must be considered in any case. 3 For type 439: material is ISOLAST Set Pressure Limits Sealing plate disc Material [psig] VESPEL SP- 50 Kel-F.5 min. Pressure Range [bar] [psig] max. [bar] Registered Trademarks Buna-N, Teflon, Viton, VESPEL SP-, Neoprene, Kalrez Buna EP Company DuPont Bayer 3M Teflon Kel-F Busak + ISOLAST Shamban LWN 47. 3

24 Series 437 Threaded Safety Relief Valves Spring Loaded Accessories and Options Heating Jacket Heating Jacket (Type 437) Application Pressure relief valves in systems to be protected from media which are viscous, sticky or have a tendency to crystallize out of solution can be fitted with a heating jacket. For type 437 the outlet body is fitted with a fabricated heating jacket. The position of the heating connections is shown in figure. Specifications of the heating jacket The operating data for the heating jacket are shown on a separate name plate. Operating Pressure p max Operating Temperatures T max 60 psig 40 F Available heating connections Connection Option Code Couplings FNPT S0 + H9 Type 437 with heating jacket 4 LWN 47.

25 Spare Parts Discs O-ring Spare Parts Discs Type 437 metal to metal seat (Item 7) Valve Size [Inch ] Type 4373 Hardened stainless steel Type 4374 Stainless Steel all Discs Type 438 soft seal with o-ring, disc material: (Item 7) Valve Size all (standard version) [Inch ] O-ring size ARP-no. CR Neoprene K EPDM Ethylene F FPM (FKM) Viton L NBR Nitrile N FFKM Kalrez C 0. 7 /6 x 3 / ARP all (long version) 0. 7 /6 x 3 / ARP O-ring Type 438 soft seal (Item 7.3) Valve Size [Inch ] O-ring size ARP-no. CR Neoprene K EPDM Ethylene F FPM (FKM) Viton L NBR Nitrile N FFKM Kalrez C all 0. 7 /6 x 3 / ARP Discs Type 439 with vulcanized soft seal (Item 7) Valve Size [Inch ] CR Neoprene K EPDM Ethylene F FPM (FKM) Viton L NBR Nitrile N FFKM ISOLAST C all LWN

26 Series 437 Threaded Safety Relief Valves Spring Loaded Spare Parts Inlet Bodies Inlet Bodies Types 437 Threaded connections Material (Item ) Male NPT Female NPT Size [Inch ] Part Number Size [Inch ] Part Number / / / / Inlet Bodies Types 438 / 439 Threaded connections Material (Item ) Male NPT Female NPT Size [Inch ] Part Number Size [Inch ] Part Number / / / / LWN 47.4

27 Approvals Series 437 Rated slope Approvals Series 437 Coefficient of Discharge Country Code Type Fluid Approval No. ASME Certified K ASME Measured K D United States ASME Sec. VIII / 439 S / G L S / G L Canada CRN 437 / 438 / 439 S / G / L OG077.9C 0. Refer to ASME Sec. VIII Country Code Type Fluid Approval No. Certified Coefficient of Discharge K dr Europe PED 97 / 3 / EC (CE-marking) / 439 S / G L S / G L 0700 Z0008/0/ α w Germany AD 000- Merkblatt A China: / 439 CSBQTS S / G L S / G L TUEV-SV Others Russia: Ship classification authorities: DIN GOST BV, DNV, GL, LROS, RINA Notes: Acc. to ASME Sec. VIII the certified coefficient of discharge K is calculated by K = 0.9 * K D For sizing acc. to ASME Sec. VIII K must be used in the sizing equations. Rated slope Within the capacity certification according to ASME Sec. VIII the coefficients of discharge for series 437 are issued as rated slope values instead of K values. Rated slope values can be converted into K values. The table above shows the converted K values. The original rated slope values are listed below. Fluid Rated slope Type 437 Rated slope Type 438/439 S.86 lb / hr / PSIA.55 lb / hr / PSIA G.0 SCFM / PSIA SCFM / PSIA L.54 GPM PSID.49 GPM / PSID LWN

28 Series 437 Threaded Safety Relief Valves Spring Loaded Capacities US Units STEAM AIR WATER Type 437 STEAM ASME Section VIII [lb/hr] Capacities US Units AIR ASME Section VIII [S.C.F.M.] Capacities US Units WATER ASME Section VIII [US - G.P.M.] Capacities US Units Set pressure [psig] Set pressure 0. Inch [psig] Set pressure 0. Inch [psig] 0. Inch Capacities for saturated steam according to ASME Section VIII (UV), based on set pressure plus 0 % overpressure. Capacities at 30 psig and bellow are based on 3 psig overpressure. Capacities for air according to ASME Section VIII (UV), based on set pressure plus 0 % overpressure at 60 F. Capacities at 30 psig and below are based on 3 psig overpressure. Capacities for water according to ASME Section VIII (UV), based on set pressure plus 0 % overpressure at 68 F. Capacities at 30 psig and below are based on 3 psig overpressure. 8 LWN 47.6

29 Capacities Metric Units STEAM AIR WATER Type 437 STEAM ASME Section VIII [kg / hr] Capacities Metric Units AIR ASME Section VIII [Sm 3 /hr] Capacities Metric Units WATER ASME Section VIII [0 3 kg/ hr] Capacities Metric Units Set pressure [bar] Set pressure 78.5 mm [bar] Set pressure 78.5 mm [bar] 78.5 mm Capacities for saturated steam according to ASME Section VIII (UV), based on set pressure plus 0 % overpressure. Capacities at.07 bar (30 psig) and below are based on 0.07 bar (3 psig) overpressure. Capacities for air according to ASME Section VIII (UV), based on set pressure plus 0 % overpressure at 6 C. Capacities at.07 bar (30 psig) and below are based on 0.07 bar (3 psig) overpressure. Capacities for water according to ASME Section VIII (UV), based on set pressure plus 0 % overpressure at 0 C. Capacities at.07 bar (30 psig) and below are based on 0.07 bar (3 psig) overpressure. LWN

30 Series 437 Threaded Safety Relief Valves Spring Loaded Capacities US Units STEAM AIR WATER Type 438 / 439 STEAM ASME Section VIII [lb/hr] Capacities US Units AIR ASME Section VIII [S.C.F.M.] Capacities US Units WATER ASME Section VIII [US - G.P.M.] Capacities US Units Set pressure [psig] Set pressure 0. Inch [psig] Set pressure 0. Inch [psig] 0. Inch Capacities for saturated steam according to ASME Section VIII (UV), based on set pressure plus 0 % overpressure. Capacities at 30 psig and bellow are based on 3 psig overpressure. Capacities for air according to ASME Section VIII (UV), based on set pressure plus 0 % overpressure at 60 F. Capacities at 30 psig and below are based on 3 psig overpressure. Capacities for water according to ASME Section VIII (UV), based on set pressure plus 0 % overpressure at 68 F. Capacities at 30 psig and below are based on 3 psig overpressure. 30 LWN 47.8

31 Capacities Metric Units STEAM AIR WATER Type 438 / 439 STEAM ASME Section VIII [kg / hr] Capacities Metric Units AIR ASME Section VIII [Sm 3 /hr] Capacities Metric Units WATER ASME Section VIII [0 3 kg/ hr] Capacities Metric Units Set pressure [bar] Set pressure 78.5 mm [bar] Set pressure 78.5 mm [bar] 78.5 mm Capacities for saturated steam according to ASME Section VIII (UV), based on set pressure plus 0 % overpressure. Capacities at.07 bar (30 psig) and below are based on 0.07 bar (3 psig) overpressure. Capacities for air according to ASME Section VIII (UV), based on set pressure plus 0 % overpressure at 6 C. Capacities at.07 bar (30 psig) and below are based on 0.07 bar (3 psig) overpressure. Capacities for water according to ASME Section VIII (UV), based on set pressure plus 0 % overpressure at 0 C. Capacities at.07 bar (30 psig) and below are based on 0.07 bar (3 psig) overpressure. LWN

32 Series 437 Threaded Safety Relief Valves Spring Loaded Specification Sheet Specification Sheet Please fax to: or your local representative Company: Phone: Page: of Location: Name: Reference: Fax: Date: GENERAL Item No.: 9 Basis of Selection: Code: Tag No.: ASME VIII 3 Customer: PED 97/ 3/ EC (CE-marking) Fire 4 Equipment: other: 5 Enquiry/Order No.: 0 Documentation: Material test report 6 Delivery time: inlet body outlet body 7 Number of valves: other: 8 Number of spare valves: SERVICE CONDITIONS Fluid and state: Steam (S) Gas (G) Liquid (L) Two phase Molecular weight: 0 Set pressure / units: 3 Coefficient C: Operating pressure / units: 4 Ratio of specific heats k: Cold diff. set pressure / units: 5 Compressibility factor Z: 3 Const. back pressure / units: 6 Spec. gravity / units: 4 Var. back pressure / units: 7 Viscosity / units: 5 Overpressure: 0 %... % 8 Relieving temperature / units: 6 Blowdown: 0 % 0 % 9 Required capacity / units:... % VALVE CONSTRUCTION 7 Designation: 8 Connection inlet Connection outlet 9 Size: Size: 30 Thread type or Flange class: Thread type or Flange class: 3 Facing type: RF RJ other: Facing type: RF RJ other: MATERIALS 3 LESER Material Code 3: Chrome steel 4: Stainless steel 33 LESER Type: Soft seat CR NBR EPDM 34 Inlet body: seal: FPM FFKM other: 35 Outlet body: 38 Spring: high temp. alloy steel carbon steel 36 Disc (Type 437): SS hardened stainless steel other: other: 39 Comply with NACE MR 075 Yes No ACCESSORIES AND OPTIONS 40 Lifting lever: packed H4 cap H 4 Others (specify): SIZING AND SELECTION 4 Required orifice area / units: 43 Selected orifice area / units: 44 Coeff. of discharge: 45 Calculated capacity / units: Order Code 4 3. Please fill in these fields in any case. Please fill in these fields if possible. These fields will be completed by the supplier. Article No. Set Pressure Connections Options Documentation Code and Medium 3 LWN 47.30

33 Series 459 Series 459 Type 459 / 46 Type 459 / 46 carbon steel LWN

34 Series 459 Threaded Safety Relief Valves Spring Loaded Materials Type 459 Materials Type 459 Item Part Name Type 4593 SG Iron Inlet body SA 479 Outlet body Gr Disc 8 Guide Hardened stainless steel AISI 430F tenifer 9 Bonnet Gr Carbon Steel SA 05 SA 479 Spindle AISI 40 AISI 40 4 Split ring AISI 430F AISI 430F 6/7 Spring plate Steel Steel 8 54 Adjusting screw with bushing Spring standard Spring optional Threaded Connections AISI 430F PTFE 9 Lock nut Steel Steel 40 Cap H Steel Steel Carbon Steel High temp. alloy steel or stainless steel Type 459 Carbon Steel SA 479 SA 479 Hardened stainless steel AISI 430F tenifer AISI 430F PTFE Carbon Steel High temp. alloy steel or stainless steel Type 4594 Stainless Steel SA 479 SA 479 PTFE Stainless Steel Type Pin Gasket Graphite / Flanged Version Inlet body SA 479 SA 479 SA 479 Outlet body Gr SA 479 SA 479. Outlet adaptor. Outlet flange 48 Inlet flange Graphite / Graphite / 6 Ball Type 459 Flanged version LWN 47.3

35 Materials Type 459 Balanced Bellows Design Materials Type 459 Balanced Bellows Design 40 Threaded Connections Item Part Name Type 4593 SG Iron Inlet body SA 479 Outlet body Gr Type 459 Carbon Steel SA 479 SA 479 Type 4594 Stainless Steel SA 479 SA Disc 8 Guide Hardened stainless steel AISI 430F tenifer 9 Bonnet Gr Carbon Steel SA 05 SA 479 Bonnet spacer SA 479 SA 479 SA 479 Spindle AISI 40 AISI 40 4 Split ring AISI 430F AISI 430F 5 Bellows 6 / 7 Spring plate Steel Steel 8 54 Adjusting screw with bushing Spring standard Spring optional AISI 430F PTFE 9 Lock nut Steel Steel 40 Cap H Steel Steel Carbon Steel High temp. alloy steel or stainless steel Flanged Version Inlet body SA 479 Outlet body Gr Hardened stainless steel AISI 430F tenifer AISI 430F PTFE Carbon Steel High temp. alloy steel or stainless steel SA 479 SA 479 SA 479 SA 479. Outlet adaptor. Outlet flange 48 Inlet flange PTFE Stainless Steel 57 Pin Gasket Graphite / Graphite / Graphite / 6 Ball Type 459 Balanced bellows design LWN

36 Series 459 Threaded Safety Relief Valves Spring Loaded Materials Type 46 Materials Type 46 Item Part Name Type 463 SG Iron Inlet body SA 479 Outlet body Gr Disc with soft seal 8 Guide AISI 430F tenifer 9 Bonnet Gr Carbon Steel SA 05 SA 479 Spindle AISI 40 AISI 40 4 Split ring AISI 430F AISI 430F 6 Spring plate Steel Steel 8 54 Adjusting screw with bushing Spring standard Spring optional Threaded Connections AISI 430F PTFE 9 Lock nut Steel Steel 40 Cap H Steel Steel 60 Gasket Carbon Steel High temp. alloy steel or stainless steel Graphite / Type 46 Carbon Steel SA 479 SA 479 AISI 430F tenifer AISI 430F PTFE Carbon Steel High temp. alloy steel or stainless steel Graphite / Type 464 Stainless Steel SA 479 SA 479 PTFE Stainless Steel 57 Pin Graphite / 6 Ball Type Flanged Version Inlet body SA 479 Outlet body Gr SA 479 SA 479 SA 479 SA 479. Outlet adaptor. Outlet flange 48 Inlet flange Note: CR Neoprene NBR Nitrile EPDM Ethylene / Propylene FPM Fluorocarbon FFKM Kalrez Type 46 Flanged version LWN 47.34

37 Materials Type 46 Balanced Bellows Design Materials Type 46 Balanced Bellows Design Item Part Name Type 463 SG Iron Inlet body SA 479 Outlet body Gr Disc with soft seal 8 Guide AISI 430F tenifer 9 Bonnet Gr Bonnet spacer SA 479 SA 479 SA 479 Spindle AISI 40 AISI 40 4 Split ring AISI 430F AISI 430F 5 Bellows 6/ 7 Spring plate Steel Steel 8 54 Adjusting screw with bushing Spring standard Spring optional Threaded Connections AISI 430F PTFE 9 Lock nut Steel Steel 40 Cap H Steel Steel 60 Gasket Carbon Steel High temp. alloy steel or stainless steel Graphite / Flanged Version Inlet body SA 479 Outlet body Gr Type 46 Carbon Steel SA 479 SA 479 AISI 430F tenifer CarbonSteel SA 05 AISI 430F PTFE Carbon Steel High temp. alloy steel or stainless steel Graphite / SA 479 SA 479 Type 464 Stainless Steel SA 479 SA 479 SA 479 PTFE Stainless Steel 57 Pin Graphite / 6 Ball SA 479 SA 479. Outlet adaptor. Outlet flange 48 Inlet flange Note: CR Neoprene NBR Nitrile EPDM Ethylene / Propylene FPM Fluorocarbon FFKM Kalrez Type 46 Balanced bellows design LWN

38 Series 459 Threaded Safety Relief Valves Spring Loaded Materials Type 459 Heavy Duty Design Materials Type 459 Heavy Duty Design Item Part Name Inlet body Outlet body 7 Disc 8 Guide 9 Bonnet Spindle 6/7 Spring plate 8 Adjusting screw with bushing 40 Cap H 54 Spring Threaded Connections Type 4594 Stainless Steel SA 479 SA 479 SA Split ring PTFE 9 Lock nut Stainless Steel 57 Pin Gasket Graphite / 6 Ball Type 459 Heavy duty design Type 459 Heavy duty design with balanced bellows LWN 47.36

39 Material Options Type 4594 The Heavy Duty Design of Type 459 offers the possibility to easily obtain special material versions. The fact that all product wetted parts are machined from bar stock materials makes it easier and faster to fulfill almost all material requirements according to the material availability. Two special material levels are available: Level special materials for the trim = wetted parts in closed position Level special material for trim and outlet = wetted parts in open position Material Options Type 4594 Heavy Duty Design Item 7 Level Trim Part Name Inlet body Disc Level Trim and Outlet Item Part Name Inlet body Outlet body Disc Bonnet spacer Bellows Pin 6 Ball Option Code Material Option Code Material Grade HA Hastelloy Grade HB Hastelloy Grade MA Monel Grade MB Monel Grade DA Duplex Grade DB Duplex Note: Available in, Duplex, Hastelloy, Inconel, Monel. Other materials on request. LWN

40 Series 459 Threaded Safety Relief Valves Spring Loaded How to Order Numbering System How to Order Numbering System 3 Article Number Set Pressure Connections Type 459 / 46 Please state unit (in gauge)! Please do not exceed pressure range mentioned in the spring charts. Please refer to table Available Connections on page 43. Please state one option code for each, inlet and outlet. Types of sealing Metal seat Metal-to-metal Metal-to-metal stellited Soft seat EPDM NBR CR FFKM (Kalrez ) FKM (Viton ) Plastic seat SP Vespel-SP PCTFE Kel-F PTDE-FDA Teflon 459 Type Material Code Body Material Carbon Steel 3 Body Material SG iron 4 Body Material Stainless Steel Valve Code Identifies valve size, body material and orifice, refer to page 4. Code for lifting device Screwed cap H 3 Plain lever H3 4 Packed lever H psig V6 V7 Article No. Set Pressure Connections 40 LWN 47.38

41 How to Order Numbering System Options Documentation Code and Medium Type 459 / 46 Option Code Outlet body L9 heavy duty design (Type 459) Inlet body stellited L0 (Type 459) Soft seal material NBR N J30 (Type 46) EPDM F J CR K J FKM L J3 FFKM C J0 Stainless steel bellows p < 580 psig J78 p > 580 psig J78 + J55 Hastelloy J8 Elastomer bellows J79 Heating jacket H9 Heating jacket H33 bonnet spacer High temperature X0 alloy spring Stainless steel spring X04 Please select requested documentation: Material test certificate DIN EN Parts Inlet body Outlet body Bonnet Cap/ lever cover Disc Option Code H0 L34 L30 L3 L3. Code. ASME Section VIII. CE / VdTUEV 3. ASME Section VIII + CE / VdTUEV Medium. Gases. Liquids.3 Steam.0 Steam/ Gases/ Liquids (valid only for CE / VdTUEV) J78 H0 L30. Options Documentation Code and Medium LWN

42 Series 459 Threaded Safety Relief Valves Spring Loaded How to Order Article Numbers How to order Article Numbers Type 459 Type 4593 Body Material SG Iron Type 459 Body Material Carbon Steel Type 4594 Body Material Stainless Steel [Inch ] Cap H Packed Lever H4 Plain Lever H3 Cap H Packed Lever H4 Plain Lever H3 Cap H Packed Lever H Article Numbers Type 46 Type 463 Body Material SG Iron Type 46 Body Material Carbon Steel Type 464 Body Material Stainless Steel [Inch ] Cap H Packed Lever H4 Plain Lever H3 Cap H Packed Lever H4 Plain Lever H3 Cap H Packed Lever H Article Numbers Type 459 Heavy duty design [Inch ] Cap H Type 4594 Body Material Stainless Steel Packed Lever H (L) (S/G) Notes: Liquid service Steam and gas service Article Numbers Type 46 Heavy duty design [Inch ] Cap H Type 464 Body Material Stainless Steel Packed Lever H LWN 47.40

43 How to Order Available Connections Male thread Female thread Flanged version Available Connections Threaded Option codes Inlet Male NPT Inlet Female NPT Outlet Female NPT Size [Inch ] Size [Inch ] Size [Inch ] / V6 V6 V6 / V58 V58 V58 / 3 /4 V6 V6 V6 3 /4 V59 V59 V59 V59 3 /4 V63 V63 V63 V63 V60 V60 V60 V60 V7 V7 V7 / V64 / V75 / V7 V7 V7 Available Connections Flanged ANSI B6.5 Option codes Inlet [Inch ] Outlet [Inch ] Size / 3 /4 / ANSI-Class / / / / / / V0 V0 V03 V04 V05 V06 V07 V08 V09 V0 V V V0 V0 V03 V04 V05 V06 V07 V08 V09 V0 V V 0.06 V05 V06 V07 V08 V09 V0 V V V05 V06 V07 V08 V09 V0 V V Size / ANSI-Class / / V8 V9 V0 V8 V9 V0 V V V3 V8 V9 V0 V V V V V V3 Notes: maximum inlet flange class: #500 extended center to face dimension outlet: 4 3 /4 (0 mm) LWN

44 Series 459 Threaded Safety Relief Valves Spring Loaded Dimensions and Weights Type 459 / 46 Male thread Female thread Flanged version Dimensions and Weights Threaded Connections US Units Connection Size [Inch] Inlet Center to Face [Inch] Male Female a c a / x /4 x x 3 /4 3 /4 47 /64 55 /64 /64 /8 /64 /64 /64 3 /4 x / 9 /3 55 /64 /4 x / 57 /64 /8 /4 / x / /8 /8 63 /64 Note: not for orifice inch Outlet b 6 /64 Standard Height [Inch] Bellows Weight [lbs] H max. H max. m /6 /6 7 /3 7 /3 /64 /8 6 /64 6 / / / / / Dimensions and Weights Flanged Connections US Units [Inch ] RF 500 RF a 3 5 /6 3 5 / / /64 Center to Face [Inch] Inlet 300 RJ 500 RJ a 4 7 /3 4 7 /3 4 7 /3 4 9 /6 500 RJ a 4 3 / / / /3 Outlet 50 RF 600 RF b 3 5 /6 Standard H 63 /64 63 /64 63 / /64 Height [Inch] Bellows H 4 /4 4 /4 4 3 /8 Weight [lbs] m LWN 47.4

45 Dimensions and Weights Type 459 / 46 Flange Thickness Dimensions and Weights Threaded Connections Metric Units Center to Face [mm] Connection Size Inlet [Inch] Male a c / x /4 x x /4 x / 49 x / 48 7 / x / Note: not for orifice inch Female a Outlet b 75 Standard Height [mm] Bellows Weight [kg] Hmax. Hmax. m Dimensions and Weights Flanged Connections Metric Units [mm ] RF 500 RF a Center to Face [mm] Inlet 300 RJ 500 RJ a RJ a Outlet 50 RF 600 RF b 00 Standard Hmax Height [mm] Bellows Hmax Weight [kg] m 8 Flange Thickness US Units Flange Thickness [Inch] Flange Thickness Metric Units Flange Thickness [mm] Connection Size [Inch] Class 50 s Class 300/600 s Class 900/500 s Class 500 s Connection Size [Inch] Class 50 s Class 300/600 s Class 900/500 s Class 500 s / /4 5 /8 /6 3 /4 / 5 /6 5 /6 5 /6 /8 3 /6 /4 /4 9 /6 9 /6 7 /6 / 5 /8 / / / LWN

46 Series 459 Threaded Safety Relief Valves Spring Loaded Pressure Temperature Ratings US Units Type 459 / 46 Pressure Temperature Ratings US Units Type 459 Notes: [Inch ] min Set Pressure Range [psig] max (600) min. with bellows Temperature Range acc. to ASME [ F] SG Iron Carbon Steel Stainless Steel Stainless Steel Heavy Duty Design min. max. min. max. min. max. min. max for flanged versions the pressure temperature rating acc. to ANSI B 6.34 may supersede these limits above 57 F / 300 C stainless steel bellows is required for spring heat protection 3 value in brackets: special spring required, expect longer lead time Pressure Temperature Ratings US Units Type 46 Notes: [Inch ] min Set Pressure Range [psig] max min. with bellows SG Iron min. max for flanged versions the pressure temperature rating acc. to ANSI B 6.34 may supersede these limits the temperature is limited by the soft seal material, please refer to soft seal selection table on page 53 Temperature Range acc. to ASME [ F] Carbon Steel Stainless Steel min. max. min. max LWN 47.44

47 Pressure Temperature Ratings Metric Units Type 459 / 46 Pressure Temperature Ratings Metric Units Type 459 Notes: [mm ] min Set Pressure Range [bar] max. 590 (800) min. with bellows Temperature Range acc. to ASME [ C] SG Iron Carbon Steel Stainless Steel Stainless Steel Heavy Duty Design min. max. min. max. min. max. min. max for flanged versions the pressure temperature rating acc. to ANSI B 6.34 may supersede these limits above 57 F / 300 C stainless steel bellows is required for spring heat protection 3 value in brackets: special spring required, expect longer lead time Pressure Temperature Ratings Metric Units Type 46 Notes: [mm ] min Set Pressure Range [bar] max min. with bellows SG Iron min. max. for flanged versions the pressure temperature rating acc. to ANSI B 6.34 may supersede these limits the temperature is limited by the soft seal material, please refer to soft seal selection table on page 53 Temperature Range acc. to ASME [ C] Carbon Steel Stainless Steel min. max. min. max LWN

48 Series 459 Threaded Safety Relief Valves Spring Loaded Accessories and Options Caps and Levers Accessories and Options Caps and Levers Series 459 is available with the following lever designs Cap H Plain lever H3 Packed lever H4 Test gag, available for cap H and packed lever H4 Materials subassembly Item 40 Item Component Cap H Body Material Carbon Steel or SG Iron Plain Lever H3 Packed Lever H4 Body Material Stainless Steel. Lever cover Gr Gr CF8M Cap Steel 3 a Spacer 3 b Hex screw B7 4 /.4 Shaft / Bolt Steel Steel.5 Lifting fork Carbon Steel Carbon Steel 6 /.6 Lever Carbon Steel Carbon Steel 36SS.7 Washer Carbon Steel Carbon Steel 36SS.8 Nut H 8M.9 O-ring Viton.9 Bushing Graphite.0 Retaining clip Carbon Steel Carbon Steel.0 Nut. Support ring Carbon Steel 36SS Spindle cap Carbon Steel Carbon Steel 3 Pin 36SS 36SS 36SS 4 Retaining clip 36SS 36SS 36SS Plug Plastic 3 Seal Plastic Plastic Plastic Plastic Plastic 4 Seal wire 36SS 36SS 36SS 36SS 36SS 5 Sealing nose 93 Test gag 36SS 36SS 36SS 36SS 93.5 Washer Fiber Fiber Fiber Fiber Cap H Packed Lever H b Cap H Plain lever H3 48 LWN 47.46

49 Accessories and Options Caps and Levers a BLOCKED. Remove after testing!..9.4 Packed lever H4 Test gag LWN

50 Series 459 Threaded Safety Relief Valves Spring Loaded Accessories and Options Balanced Bellows Balanced Bellows Application Bellows protect the guides, moving parts and the spring from dirt, corrosion, impurities or temperature to guarantee the proper function of the safety relief valve. Additionally they provide for back pressure compensation. Design Series 459 with balanced bellows is provided with a bonnet spacer to house the bellows. The spacer serves for cooling and shields the bellows against turbulences during discharge to avoid vibration and to guarantee longer lifetime. Materials and Limits of Application Bellows material Bellows joint materials Minimum set pressure limit Maximum set pressure limit Superimposed back pressure limit 3 Built up back pressure limit 3 Temperature limits (Type 459) Standard Heavy Duty Option codes J78 J78 + J psig 580 psig 580 psig acc. to set pressure limit of the valve 3 psig 580 psig max. 35 % of set pressure, not to exceed the maximum bellows back pressure limit up to 75 F Hastelloy Hastelloy C Hastelloy C J8 (Hastelloy ) Inconel Inconel Inconel J78 + S5 (Inconel ) Notes: The bellows for type 459/46 is back pressure compensating for orifice size 0.06 Inch (33 mm ). It is over compensating for orifice size Inch (63,6 mm ) and under compensating for orifice size Inch (4 mm ). Please ask factory for details. Type 4594 with heavy duty body: up to 0 F, the temperature limits for type 46 depend on other parts e.g. soft seal materials. 3 The so called built up back pressure limit defines limit for which the proper function of the pressure relief valve is ensured. The superimposed back pressure limit of a bellows refers only to the static stability of the bellows design and does not consider the influence of the backpressure on the opening and closing of a pressure relief valve. Conversion kits are available for an easy change from a conventional design to a balanced bellows design. Conversion kits contain all necessary parts which must be replaced (bellows, spacer, spindle and gaskets). Please refer to page 56 Spare Parts. 50 LWN 47.48

51 Accessories and Options Metal Seat Metal Seat (Type 459) The LESER metal seats (disc and nozzle) are lapped to optical flatness to ensure a tight shut off. LESER safety relief valves are supplied with a standard leak tightness according to API Type 459 / Type 4593 Standard material for the disc is a hardened stainless steel. The combination of a hard disc material and a softer seat material () provides for improved wear resistance and longer product life Type 4594 Disc and seat are provided in material for highest corrosion resistance. Any other material which is available from bar stock can be supplied as well (e.g. Hastelloy, Monel, Alloy0, ). Metal seat Stellited sealing surfaces Materials subassembly Item 7 Item Part Name Type 4593 Body Material SG Iron Type 459 Body Material Carbon Steel Type 4594 Body Material Stainless Steel Disc Hardened stainless steel Hardness HRC Hardened stainless steel Hardness HRC Lifting aid Retaining clip Pin Item 7. Part Name Disc Inlet Body Optional stellited sealing surfaces stellited Hardness HRC stellited Hardness HRC Discs with stellited sealing surfaces For high temperature applications above 84 F, or applications with abrasive fluids wear resistant sealing surfaces are recommended. The sealing surfaces of the disc, seat or nozzle can be stellited by build-upwelding. The minimum thickness of the stellite is 0.06 inch. In addition to the corrosion resistance, the stellited surface also offers a high resistance to impact and sudden changes in temperature. LWN

52 Series 459 Threaded Safety Relief Valves Spring Loaded Accessories and Options Soft Seal Soft Seal O-ring disc (Type 46) Disc with sealing plate (Type 459, optional) Application Type 459 and 46 are provided with a soft seal disc for superior tightness maintained tightness close to the set pressure Features and Benefits two designs with o-ring or sealing plate for extended application range minimized leakage and product loss large selection of soft seal materials simple replacement of soft seal standard ARP o-ring sizes reduced maintenance costs one standard durometer per o-ring material For temperature limits and medium resistance refer to the soft seal selection table. O-ring disc Type 46 Disc with sealing plate Type 459 Disc with sealing plate For applications, where the increased tightness of a soft seat seal is required but the temperature is too low or too high for an o-ring-disc, e.g. liquefied gases. Materials subassembly Item 7 Item Type 46 O-ring disc Item Type 459 Disc with sealing plate Part Name Material Part Name Material Disc Lifting aid Disc Lifting aid 3 Pin 36 3 Retaining clip 4 O-ring Refer to soft seal selection table 4 Sealing plate Refer to soft seal selection table 57 Pin Pin 36 5 LWN 47.50

53 Accessories and Options Soft Seal Soft Seal Selection Code Designation Trade name Codeletter Option Code T min [ F] [ C] [ F] [ C] T max Application CR Neoprene (Chloroprene) K J Paraffin oil, silicone oil and grease, water and waterbased solvents, refrigerants, ozone Type 46 O-ring NBR EPDM FPM (FKM) Buna-N (Nitrile-Butadiene) Buna - EP (Ethylene-Propylene - Diene) Viton (Fluorocarbon) N J D J L J Hydraulic oil, vegetable and animal grease and oil Hot water and superheated steam up to 30 F, several organic and inorganic acids, silicone oil and grease, FDA compliant For high temperature service (no superheated steam), mineral oil and grease, silicone oil and grease, vegetable and animal grease and oil, ozone, FDA compliant compound available on request FFKM Kalrez (Perfluoro) C J Nearly all chemicals, standard compound is Kalrez 6375 with steam resistance, FDA compliant compound available on request Type 459 Sealing plate Notes: SP PCTFE PTFE Other VESPEL SP- (Polyimide) Kel-F (Polychlorotrifluoroethylene) Teflon (Polytetrafluoroethylene) T G A J49 J48 J Please contact LESER LLC High temperature and high pressure applications (no steam), for chemical resistance refer to manufacturers guide Cryogenic and refrigeration application, flammable media, gaseous oxygene application up to 75 psig at 40 ºF Nearly all chemicals The code letters will be stamped on the retainer (Item ). For soft seal materials other than listed the code letter X will be used. Pressure and temperature service must be considered in any case. Set Pressure Limits Sealing plate disc Material [psig] VESPEL SP- 50 Kel-F.9 min. Pressure Range [bar] [psig] max. [bar] Registered Trademarks Buna-N, Teflon, Viton, VESPEL SP-, Neoprene, Kalrez Buna EP Kel-F Company DuPont Bayer 3M Teflon LWN

54 Series 459 Threaded Safety Relief Valves Spring Loaded Accessories and Options Heating Jacket Heating Jacket Application Pressure relief valves in systems to be protected from media which are viscous, sticky or have a tendency to crystallize out of solution can be fitted with a heating jacket. For type 459 the outlet body is fitted with a fabricated heating jacket. The position of the heating connections is shown in the drawing. Balanced Bellows Design For safety relief valves with balanced bellows, the bonnet spacer required to house the bellows is fitted with an additional heating jacket. Both heating jackets are joined by a tubing. Specifications of the heating jacket The operating data for the heating jacket are shown on a separate name plate. Operating Pressure Operating Temperatures p max 60 psig T max 57 F Available heating connections Type 459 with heating jacket Connection Option Code Couplings FNPT H9 54 LWN 47.5

55 Accessories and Options Lift Indicator Lift Indicator (proximity switch) Lift indicators are an important component for automation. They are used to monitor operating status. As an option, Series 459 can be provided with an inductive proximity switch. The lift indicator will indicate an opening of the pressure relief valve when the vessel pressure has increased so that the valve opens with a pop. LESER provides DC proximity switches type N using two-wire technology. These intrinsically safe proximity switches can be used in explosion hazard area zone 0. Other types of switches can be used as well. B A 94 The lift indicator option is available for series 459 in combination with the packed lever H4 either with or without proximity switch. The connection size is M8 x. A = closed position B = open position Option Option Code Lifting device H4 with adaptor for lift indicator M8 x J39 Lift indicator type PEPPERL + FUCHS NJ5-8GK-N (5 V to 5 V d.c.) J93 LWN

56 Series 459 Threaded Safety Relief Valves Spring Loaded Spare Parts Discs Spare Parts Discs Type 459 metal to metal seat (Item 7) [Inch ] Type 459 / 4593 Hardened stainless steel Type 4594 Steam and gas service: Liquid service: Discs Type 46 soft seal, disc material: (Item 7) [Inch ] O-ring size ARP-no. CR Neoprene K EPDM Ethylene D FPM (FKM) Viton L NBR Nitrile N FFKM Kalrez C / x 3 /3 ARP /6 x 3 /3 ARP On Request /6 x 3 /3 ARP On Request O-ring Type 46 soft seal (Item 7) [Inch ] O-ring size ARP-no. CR Neoprene K EPDM Ethylene D FPM (FKM) Viton L NBR Nitrile N FFKM Kalrez C / x 3 /3 ARP /6 x 3 /3 ARP On Request /6 x 3 /3 ARP On Request 56 LWN 47.54

57 Spare Parts Inlet Bodies Inlet Bodies and Flanges Bellows Gaskets Inlet Bodies Type 459 / 46 Threaded connections Material (Item ) Male NPT Size [Inch ] Inlet Body / / / / / / / Female NPT Size [Inch ] Inlet Body / /4 /4 / / / / Bellows and Bellows Conversion Kits Material (Item 5) Valve Size Set pressure Bellows Conversion Kit all p 580 psig (40 bar) all p > 580 psig (40 bar) Note: The bellows for type 459 / 46 is back pressure compensating for orifice size 0.06 In (33 mm ). Gaskets Body Bonnet (Item 60) Valve Size Gasket Material all Graphite + 36 SS all Gylon (filled PTFE) LWN

58 Series 459 Threaded Safety Relief Valves Spring Loaded Approvals Series 459 Approvals Series 459 Coefficient of Discharge Country Code Type Fluid Approval No. ASME Certified K ASME Measured K D United States ASME Sec. VIII 459 / 46 S / G L 37 All 370 All Canada CRN 459 / 46 S / G / L OG0730.9C All Refer to ASME-code Country Code Type Fluid Approval No. Certified Coefficient of Discharge K dr Europe PED 97/3/EC (CE-marking) 459 / 46 S / G L S / G L S / G L S / G L 0700 Z0008/0/ α w Germany AD 000- Merkblatt A 459 / 46 S / G L S / G L S / G L S / G L TUEV-SV China: SELO / AQSIQ (SQLBPV) Others Russia: Ship classification authorities: DIN GOST BV, DNV, GL, LROS, RINA Note: Acc. to ASME Sec. VIII the certified coefficient of discharge K is calculated by K = 0.9 * K D For sizing acc. to ASME Sec. VIII K must be used in the sizing equations. Type 46: K dr = 0.6 / α w = LWN 47.56

59 Capacities US Units / Metric Units STEAM Type 459 / 46 STEAM ASME Section VIII [lb/hr] Capacities US Units STEAM ASME Section VIII [kg / hr] Capacities Metric Units [Inch ] Set pressure [psig] Set pressure [bar] [mm ] Capacities for saturated steam according to ASME Section VIII (UV), based on set pressure plus 0 % overpressure. Capacities at 30 psig (.07 bar) and bellow are based on 3 psig (0.07 bar) overpressure. LWN

60 Series 459 Threaded Safety Relief Valves Spring Loaded Capacities US Units / Metric Units AIR Type 459 / 46 AIR ASME Section VIII [S.C.F.M.] Capacities US Units AIR ASME Section VIII [Sm 3 /hr] Capacities Metric Units Set pressure [psig] [Inch ] [mm ] Set pressure [bar] Capacities for air according to ASME Section VIII (UV), based on set pressure plus 0 % overpressure at 60 F (6 C). Capacities at 30 psig (.07 bar) and below are based on 3 psig (0.07 bar) overpressure. 60 LWN 47.58

61 Capacities US Units / Metric Units WATER Type 459 / 46 WATER ASME Section VIII [US - G.P.M.] Capacities US Units WATER ASME Section VIII [0 3 kg/ hr] Capacities Metric Units [Inch ] Set pressure [psig] Set pressure [bar] [mm ] Capacities for water according to ASME Section VIII (UV), based on set pressure plus 0 % overpressure at 68 F (0 C). Capacities at 30 psig (.07 bar) and below are based on 3 psig (0.07 bar) overpressure. LWN

62 Series 459 Threaded Safety Relief Valves Spring Loaded Specification Sheet Specification Sheet Please fax to: or your local representative Company: Phone: Page: of Location: Name: Reference: Fax: Date: GENERAL Item No.: 9 Basis of Selection: Code: ASME VIII Tag No.: PED 97/ 3/ EC (CE-marking) Fire 3 Customer: Two phase flow 4 Equipment: other: 5 Enquiry/Order No.: 0 Documentation: Material test report 6 Delivery time: inlet body outlet body 7 Number of valves: bonnet: 8 Number of spare valves: other: SERVICE CONDITIONS Fluid and state: Steam (S) Gas (G) Liquid (L) Two phase Molecular weight: 0 Set pressure / units: 3 Coefficient C: Operating pressure / units: 4 Ratio of specific heats k: Cold diff. set pressure / units: 5 Compressibility factor Z: 3 Const. back pressure / units: 6 Spec. gravity / units: 4 Var. back pressure / units: 7 Viscosity / units: 5 Overpressure: 0 %... % 8 Relieving temperature / units: 6 Blowdown: 0 % 0 % 9 Required capacity / units:... % VALVE CONSTRUCTION 7 Designation: 8 Connection inlet Connection outlet 9 Size: Size: 30 Thread type or Flange class: Thread type or Flange class: 3 Facing type: RF RJ other: Facing type: RF RJ other: MATERIALS 3 LESER Material Code : Carbon Steel 3: SG Iron 4: Stainless steel 33 LESER Type Soft seat CR NBR EPDM 34 Inlet Body: seal: FPM FFKM other: 35 Outlet Body: 39 Bellows: Hastelloy 36 Bonnet: Inconel other: 37 Disc (metal): SS hardened 40 Spring: high temp. alloy steel carbon steel other: stainless steel other: 4 Comply with NACE MR 075 Yes No ACCESSORIES AND OPTIONS 4 Lifting lever: plain H3 packed H4 cap H 44 Bellows: yes no 43 Test gag: yes no 45 Others (specify): SIZING AND SELECTION 46 Required orifice area / units: 47 Selected orifice area / units: 48 Coeff. of discharge: 49 Calculated capacity / units: Order Code 4. Please fill in these fields in any case. Please fill in these fields if possible. These fields will be completed by the supplier. 6 Article No. Set Pressure Connections Options Documentation Code and Medium LWN 47.60

63 First in safety a not so brief history of LESER History The company started in 88 as a brass foundry and over the decades developed a product portfolio of components for mechanical equipment and machines during the industrial revolution. At first LESER specialized on tough applications and its level gauges for steam boilers were famous. Soon, the company delivered their first safety valve and as a consequence of quick growing industrialization and improving demand for safety, LESER rapidly became the specialist for safety valves. Safe solutions from the specialist Today, LESER s product range includes 3 different designs with a variety of materials and sizes from / to 6, providing safe solutions for almost every application with Full lift safety valves High-pressure safety valves Safety valves according to API 56 Relief and safety relief valves Clean service safety relief valves Safety valves for critical service conditions Safety valves according to special standards and regulation Safety valves with supplementary pneumatic load Special versions Where to find LESER Headquartered in Germany, with a state-of-the-art factory and more than 90 employees, LESER is present through subsidiaries and qualified partners in over 40 countries, providing products and services worldwide. For the nearest source please contact us at: LESER LLC 664 Headland Drive Fenton, MO 6306 Phone: Fax: sales@leserusa.com Type 44 Type 459 Type 437 Type 488 Type 56 LESER s factory today LESER Headquarter 88 94

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