CRN. Series 740 Safety Valves. 4 Aquatrol Safety Relief Valves
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1 Series 740 Safety Valves Series 740 safety and relief valve is designed for accuracy and reliability. Engineered for heavy-duty industrial usage. Multiple purpose safety and relief valve for all services: Liquid, Steam and Air/Gas. ASME and National Board Certified for Section VIII as well as CE and CRN Certifications. Pressures are to 750 PSI. Available with the full array of metal and seating options. Series 740 Brass, bronze construction with stainless steel ring, seat (Disc) and springs. ASME Section VIII to 300 PSI for air/gas and liquid and 250 PSI for steam services. Series 741 Stainless steel nozzle, ring, disc and springs. Bronze bonnet, and body. ASME Section VIII to 750 PSI for Liquid and air/gas. 300 PSI for Steam. Series 742 Stainless steel nozzle, ring, disc and springs. Carbon steel body and bonnet. Ratings same as 741. Used as an all steel option. Series 743 Same as 742, with stainless steel bonnet, body and components. Used where a stainless steel valve is required. Usages: Features: Options: Pressure Vessels, Pumps, Hydraulics, Tanks, Steam Systems, Chemical, Cryogenic, Air and Gas Compressors, Separators, by-pass and over pressure protection. Choose for most industrial applications requiring a safety relief valve. Full nozzle Top guided design Short, precise blow-down Wide choice of inlet/outlet sizes Excellent re-seating characteristics Designed for heavy industrial use Closed hex cap Back-pressure tight Drain hole with threaded plug Cryogenic compatible O-ring seating options (see charts) Packed lift lever Open lift lever BSPT Piping Tri-Clamp Inlets Full array of metal options API 527 Seating 4 Safety Relief Valves CRN 2/16/18
2 Series 740 thru 743 # DESCRIPTION Nozzle B16 SA SS SA SS SA SS 2 Lock Screw B16 B16 SA SS SA SS 3 Lower Ring SA351-CF8M SA351-CF8M SA351-CF8M SA351-CF8M 4 Disc Holder B16 B16 SA SS SA SS 5 Lock Screw 18-8 SS 18-8 SS 18-8 SS 18-8 SS 6 Disc Holder Shaft B16 B16 SA SS SA SS 7 Disc Guide B16 B16 SA SS SA SS 8 Bonnet B16 B16 SA /SA216 SA SS 9 Washer PTFE PTFE PTFE PTFE 10 Seal Wire Steel / Lead Steel / Lead Steel / Lead Stainless / Lead 11 Hood B16 B16 SA SA SS 12 Pressure Screw B16 B16 SA SS SA SS 13 Lock Nut B16 B16 SA SS SA SS 14 Spring Plate B16 B16 SA SS SA SS 15 Spring 302/ / / / Spring Post B16 B16 SA SS SA SS 17 Spring Pin 18-8 SS 18-8 SS 18-8 SS 18-8 SS 18 Guide Washer PTFE PTFE PTFE PTFE 19 Disc SA SS SA SS SA SS SA SS 20 Body B584-C84400 B584-C84400 SA216-WCB A SS 21 Nozzle Washer PTFE PTFE PTFE PTFE 22 Nameplate Stainless Stainless Stainless Stainless 23 Washer PTFE PTFE PTFE PTFE Series 740 thru 743 Dimensions In. (mm) Flow Area Size A A Weight B C Orifice In2 (mm2) Inlet Outlet DN I.D. Closed Cap Lift Lever Lb (Kg) D.125 (80.6) 1/2 3/4 15 C 7 3/8" D.125 (80.6) 1/ D 7 3/8" D.125 (80.6) 3/4 3/4 20 E 7 3/8" D.125 (80.6) 3/ F 7 3/8" D.125 (80.6) G 7 3/8" E.217 (140.0) 1/ A 8 1/8" E.217 (140.0) 1/2 1-1/4 15 B 8 1/8" E.217 (140.0) 3/ C 8 1/8" E.217 (140.0) 3/4 1-1/4 20 D 8 1/8" E.217 (140.0) G 8 1/8" E.217 (140.0) 1 1-1/4 25 F 8 1/8" E.217 (140.0) 1-1/4 1-1/4 32 H 8 1/8" (206) 9 1/4" (235) 2 7/8" (73) 2" (51) 3 (1.4) F.353 (227.7) 1 1-1/2 25 F 9 1/4" (235) 9 5/8" (244) 2 7/8" (73) 2 1/4" (57) 5 (2.3) F.353 (227.7) 1-1/4 1-1/2 32 H 9 1/4" (235) 9 5/8" (244) 2 7/8" (73) 2 1/4" (57) 5 (2.3) F.353 (227.7) 1-1/2 1-1/2 40 G 9 1/4" (235) 9 5/8" (244) 2 7/8" (73) 2 1/4" (57) 5 (2.3) G.554 (357.4) 1-1/ G 10 1/4" (260) 10 5/8" (270) 3 3/8" (86) 2 5/8" (67) 9 (4.1) G.554 (357.4) 1-1/ H 10 1/4" (260) 10 5/8" (270) 3 3/8" (86) 2 5/8" (67) 9 (4.1) G.554 (357.4) F 10 1/4" (260) 10 5/8" (270) 3 3/8" (86) 2 5/8" (67) 9 (4.1) H.923 (595.5) 1-1/2 2-1/2 40 H 11 3/4" (298) 12 1/8" (308) 3 1/2" (89) 2 7/8" (73) 16 (7.3) H.923 (595.5) 2 2-1/2 50 J 11 3/4" (298) 12 1/8" (308) 3 1/2" (89) 2 7/8" (73) 16 (7.3) H.923 (595.5) 2-1/2 2-1/2 65 K 11 3/4" (298) 12 1/8" (308) 3 1/2" (89) 2 7/8" (73) 16 (7.3) J (914.8) J 14 1/4" (362) 14 1/2" (368) 4" (102) 3 1/4" (83) 18 (8.2) J (914.8) 2-1/ K 14 1/4" (362) 14 1/2" (368) 4" (102) 3 1/4" (83) 18 (8.2) J (914.8) L 14 1/4" (362) 14 1/2" (368) 4" (102) 3 1/4" (83) 18 (8.2) Safety Relief Valves 5
3 Seating Materials Min Temp Max Temp Material Names *Use for: F ( C) F ( C) Acetone, Air, Alcohol, Benzine, Butane, Ethylene, Ethylene Glycol, Ethyl Alcohol, Gasoline, FKM Viton-A -13 -(25 ) 446 (230 ) Isobutyl Alcohol, Kerosene, Lube Oil, Natural Gas, Naphtha, Nitrogen, Propane, Water, Xylene Nitrile Buna-N -40 -(40 ) 250 (121 ) EPDM -40 -(40 ) 303 (151 ) FFKM Kalrez -10 -(23 ) 550 (288 ) Air, Butane, Carbon Dioxide, Diesel Oil, Ethyl Chloride, Ethyl Ether, Fuel Oil, Gasoline, Helium, Hydrogen Sulphide, Kerosene, Natural Gas, Nitrogen, Oxygen (Gas), Propane Steam, Water, Hot Water, Acetone, Beer, Brake Fluid, Hydrogen Gas, Sulfur Dioxide, Acids, Alkalies Aromatic Hydrocarbons, Chlorinated Hydrocarbons, Polar Solvents (ketones, esters, ethers), Inorganic and Organic Acids, Water, and Steam (Steam service up to 380 F (193 C) saturated) PTFE (184 ) 450 (232 ) Cryogenic Service including Argon, Carbon Dioxide, Helium, Hydrogen, Nitrogen, Oxygen, Steam Note: This is just a partial listing. Visit for links to websites with more specific applications. PTFE Seating # DESCRIPTION Nozzle B16 SA SS SA SS SA SS 3 Lower Ring SA351-CF8M SA351-CF8M SA351-CF8M SA351-CF8M 4 Disc Holder B16 B16 SA SS SA SS 6 Disc Holder Shaft B16 B16 SA SS SA SS 24 Disc PTFE PTFE PTFE PTFE O-Ring Seating # DESCRIPTION Nozzle B16 SA SS SA SS SA SS 3 Lower Ring SA351-CF8M SA351-CF8M SA351-CF8M SA351-CF8M 4 Disc Holder B16 B16 SA SS SA SS 6 Disc Holder Shaft B16 B16 SA SS SA SS 25 O-Ring Disc SA SS SA SS SA SS SA SS 26 Screw 18-8 SS 18-8 SS 18-8 SS 18-8 SS 27 Disc Insert SA SS SA SS SA SS SA SS 28 O-Ring Various Various Various Various Series Inlet Min. Temp Metals Max. Temp 3,4 Max Pressure 1,2 Sizes F ( C) F ( C) PSI (Bar) Services Certifications 740 1/2 to 3 Brass/Bronze (196 ) 406 (208 ) 300 (20.7) Air / Gas / Steam / Liquid ASME VIII, CE, CRN 741 1/2 to 3 Stainless/Bronze (196 ) 425 (218 ) 750 (51.7) Air / Gas / Steam / Liquid ASME VIII, CE, CRN 742 1/2 to 3 Stainless/Carbon -20 -(29 ) 425 (218 ) 750 (51.7) Air / Gas / Steam / Liquid ASME VIII, CE, CRN 743 1/2 to 3 Stainless (196 ) 425 (218 ) 750 (51.7) Air / Gas / Steam / Liquid ASME VIII, CE, CRN 1) Maximum set pressure for steam service is 300 PSI (20.7 Bar) 2) Maximum set pressure for steam on Series 740 is 250 PSI (17.2 Bar) 3) Maximum temperatures depend upon seating material. 4) Contact for temps over 425 F (218 C) 6 Safety Relief Valves
4 Inlet / Lift Lever Options Open Lift Lever Options Item Description Material Options Brass Carbon Steel Stainless Steel 1 Handle C1018/Plated C1018/Plated C1018/Plated 2 Hood Anodized Alum. Anodized Alum. Anodized Alum. 3 Lifter Nut B16 Brass SA SS SA SS 4 Jam Nut 18-8 Stainless 18-8 Stainless 18-8 Stainless 5 Lift Lever Pin B16 Brass SA SS SA SS 6 Spring Optional Anti-Vibration Spring Stainless Packed Lift Lever Options Item Description Material Options Brass Carbon Steel Stainless Steel 1 Handle B16 Brass B16 Brass/Plated B16 Brass/Plated 2 Handle Screw Steel/Plated Steel/Plated Steel/Plated 3 Cam B16 Brass SA SS SA SS 4 Retaining Ring Steel/Plated 17-7 SS 17-7 SS 5 O-RIngs Viton Viton Viton 6 Cam Nut B16 Brass SA SS SA SS 7 O-RIng PTFE PTFE PTFE 8 Hood B16 Brass SA108-C1018 SA SS 9 Jam Nut 18-8 Stainless 18-8 Stainless 18-8 Stainless 10 Lifter Nut B16 Brass SA SS SA SS 11 Hood Seal PTFE PTFE PTFE 12 Plug 18-8 Stainless 18-8 Stainless 18-8 Stainless 13 Washer PTFE PTFE PTFE 14 Gag Screw 18-8 Stainless 18-8 Stainless 18-8 Stainless Inlet Options: BSPP NPT or BSPT NPT or BSPT Tri-Clamp Lifting Device as required by the ASME, ASME Section VIII: UG136(3) Each pressure relief valve on air, water at the valve inlet that exceeds 140 F (60 C), excluding over-pressure or relief events, or steam service shall have a substantial lifting device which when activated will release the seating force on the disc when the pressure relief valve is subjected to a pressure of at least 75% of the set pressure of the valve. Safety Relief Valves 7
5 Series 740 thru Threaded Inlet Part Numbers 740 ED 1 V 3 J Series Description Orifice/Size ID Connection Seating Cap Service Options 740 Brass/Bronze DC- 1/2 x 3/4 1- NPT MxF M- Metal 1- Lift lever K- ASME VIII-Air/gas 1- None Ex SS/Bronze DD- 1/2 x 1 2- NPT FxF P- PTFE 2- Closed cap L- ASME VIII-Steam Chrome SS/Carbon DE- 3/4 x 3/4 3- BSPT MxF R- PCTFE 3- Packed lift lever J- ASME VIII-Liquid Plating Stainless DF- 3/4 x 1 4- BSPT FxF V- Viton Lift Lever with P- CE - Air/gas 3- O2 Cleaned 4- DG- 1 x 1 8- BSPP MxF B- Buna Anti-Vibe Spring E- CE - Steam 4- API Seating EA- 1/2 x 1 9- BSPP FxF K- Kalrez Closed Cap D- CE - Liquid O2 Clean / EB- 1/2 x 1-1/4 E- EPDM with Test Gag N- Non-code Air/gas API Seating EC- 3/4 x 1 Packed Lever T- Non-code Steam 6- ED- 3/4 x 1-1/4 with Test Gag U- Non-code Liquid EG- 1 x 1 EF- 1 x 1-1/4 EH- 1-1/4 x 1-1/4 FF- 1 x 1-1/2 Note: FH- 1-1/4 x 1-1/2 This chart is for FG- 1-1/2 x 1-1/2 GG- 1-1/4 x 2 threaded inlets only. GH- 1-1/2 x 2 GF- 2 x 2 HH- 1-1/2 x 2-1/2 HJ- 2 x 2-1/2 HK- 2-1/2 x 2-1/2 JJ- 2 x 3 JK- 2-1/2 x 3 JL- 3 x 3 Series 740 thru Tri-Clamp Inlet Part Numbers 743 ED 5 M 1 L Series Description Orifice/Size ID Connection Seating Cap Service Options 740 Brass/Bronze DE- 3/4 x 3/4 Tri-clamp x M- Metal 1- Lift lever K- ASME VIII - Air/gas 1- None Ex SS/Bronze DF- 3/4 x 1 NPT P- PTFE 2- Closed cap L- ASME VIII - Steam Chrome SS/Carbon DH- 1 x 3/4 Tri-clamp x R- PCTFE 3- Packed lift lever J- ASME VIII - Liquid Plating Stainless DG- 1 x 1 BSPT V- Viton Lift Lever with P- CE - Air/gas 3- O2 Cleaned 4- DJ- 1-1/2 x 3/4 B- Buna Anti-Vibe Spring E- CE - Steam 4- API Seating DK- 1-1/2 x 1 K- Kalrez Closed Cap D- CE - Liquid O2 Clean / EC- 3/4 x 1 E- EPDM with Test Gag N- Non-code Air/gas API Seating ED- 3/4 x 1-1/4 Packed Lever T- Non-code Steam 6- EG- 1 x 1 with Test Gag U- Non-code Liquid EF- 1 x 1-1/4 EJ- 1-1/2 x 1 EK- 1-1/2 x 1-1/4 FF- 1 x 1-1/2 Note: FG- 1-1/2 x 1-1/2 This chart is for GE- 1 x 2 GH- 1-1/2 x 2 Tri-Clamp inlets only HH- 1-1/2 x 2-1/2 HJ- 2 x 2-1/2 JG- 1-1/2 x 3 JJ- 2 x 3 8 Safety Relief Valves
6 Liquid Capacity Liquid GPM ASME Section VIII Liquid LPM ASME Section VIII Orifice area in^2 Flow Coefficient =.791 Orifice area mm^2 Flow Coefficient =.791 D E F G H J D E F G H J PSI Bar pressures below 15 PSI (1.03 Bar) are NON-Code Maximum back-pressure is 10% of set pressure or 50 PSI (3.45 Bar) whichever is less Lifting Device as required by the ASME, ASME Section VIII: UG136(3) Each pressure relief valve on air, water at the valve inlet that exceeds 140 F (60 C), excluding overpressure or relief events, or steam service shall have a substantial lifting device which when activated will release the seating force on the disc when the pressure relief valve is subjected to a pressure of at least 75% of the set pressure of the valve. Safety Relief Valves 9
7 Air Capacity Air SCFM ASME Section VIII Air Nm3/hr ASME Section VIII Orifice area in^2 Flow Coefficient =.878 Orifice area in^2 Flow Coefficient =.878 D E F G H J D E F G H J PSI Bar pressures below 15 PSI (1.03 Bar) are NON-Code Maximum back-pressure is 10% of set pressure or 50 PSI (3.45 Bar) whichever is less Lifting Device as required by the ASME, ASME Section VIII: UG136(3) Each pressure relief valve on air, water at the valve inlet that exceeds 140 F (60 C), excluding overpressure or relief events, or steam service shall have a substantial lifting device which when activated will release the seating force on the disc when the pressure relief valve is subjected to a pressure of at least 75% of the set pressure of the valve. 10 Safety Relief Valves
8 Steam Capacity Steam Lbs/hr ASME Section VIII Steam Kg/hr ASME Section VIII Orifice area in^2 Flow Coefficient =.878 Orifice area in^2 Flow Coefficient =.878 D E F G H J D E F G H J PSI Bar pressures below 15 PSI (1.03 Bar) are NON-Code. Maximum back-pressure is 10% of set pressure or 50 PSI (3.45 Bar) whichever is less. Lifting Device as required by the ASME, ASME Section VIII: UG136(3) Each pressure relief valve on air, water at the valve inlet that exceeds 140 F (60 C), excluding overpressure or relief events, or steam service shall have a substantial lifting device which when activated will release the seating force on the disc when the pressure relief valve is subjected to a pressure of at least 75% of the set pressure of the valve. Safety Relief Valves 11
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