OpGL. Globe Control Valve OPTIMUX
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- Elfrieda Spencer
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1 Globe Control Valve
2 Control Valve The OpGL globe control valve provides a superior performance, while permitting easy, fast, inexpensive maintenance. Unlike diaphragm-operated control valves, the spring cylinder-actuated OpGL provides stiffness and maintains high positioning accuracy controlled, and a faithful response. Since it handles up to 150 psi (10.3 Barg) supply air, it also has the thrust necessary to shut off against much higher fluid pressures. Most diaphragm actuators rely entirely on springs to close the valve. But with the OpGL control valve, the spring force, the supply air pressure and the fluid pressure itself, are combined to produce and exceptionally tight shutoff. Because of its self-aligning seat ring, shutoff is made easier to be achieved in the OpGL control valve. Most common maintenance problems with globe control valves can be traced to cage-guiding. The close metal-tometal contact between the cage and the plug often results in galling and sticking. That is why the OpGL is double-top stem guided thus completely avoiding contact between the plug and the seat retainer. The clamped-in seat and top entry trim permits easy, quick maintenance. Plus, with OpGL s high degree of parts interchangeability, fewer inventory parts are needed and costs are therefore reduced. The actuator is also of a compact design, smaller, lighter and easier to handle than comparable diaphragm actuators. With Optimux s quick-and-express manufacturing system, shorter deliveries at no extra costs are possible for the customer. OpGL.The simple, reliable, rugged and economic globe valve. Fail-safe spring Very heavy guiding: Two widely-spaced on large diameter stem. Plug does not guide in retainer. Piston Cylinder Actuator: Three standard sizes cover most valve sizes. Easily reversible, stiffness, repeatability, low hysteresis are provided. Clamped-in seat ring. Valve can be disassembled quickly and easily, by removing bonnet bolts. Interchangeabillity: Class 600 body used for Class 150, 300 and 600 ratings thru 4 inch. Figure 1: OpGL Body Assembly, Class 150, 300 and 600 1
3 OpGL Body Styles Globe Style Body Globe-style bodies feature smooth, streamlined, constant area internal passages with no pockets, permitting high capacity with minimum turbulence. They are designed with nearly constant wall thickness, providing lower weight and cost, specially when the body is manufactured in stainless steel or expensive alloy steels. Angle Style Body The angle-style OpGL is completely interchangeable with the globe-style. Except for the body, all other valve parts remain the same. For additional protection of the body, a special Venturi seat ring which extends to the outlet flange is available, if required. Figure 2: Globe Style body Three-way Body Three-way bodies are used to either combining or diverting services. Due to Optimux s excellent parts interchangeability, a standard globe valve easily converts to three-way service with the addition of a three-way adapter, upper seat ring, two gaskets, and a three-way plug. Figure 3: Angle Style body Steam Jacketed Body The steam jacketed OpGL uses a standard globe-style body with oversized, blind flanges for a full jacket or standard flanges for a partial jacket. The jacket is rated for 150 psi (10.3 barg) and is equipped with a 3/4" NPT supply and drain connection. Figure 4: Three-way body Figure 5: Steam Jacketed Body 2
4 Features and Advantages Performs exactly as required High thrust rugged piston cylinder actuator Precise throttling High repeatability Trusty response High travel speed controlled Galling and sticking not possible, prevent process breakdown Cage-guiding design not applicable Double stem guides positioned away from flowing medium Large clearance completely avoids contact between plug head and seat retainer Easy, fast, inexpensive maintenance Top entry, quick maintenance Clamped-in seat ring Uniformly compressed and controlled packing Separable flanges High interchangeability of valve parts Weight and dimensions reduced Tight shutoff guaranteed when required to close Reinforced spring piston cylinder actuator Self-aligning seat ring Fluid pressure, actuator spring and cylinder pressure assisted tight shutoff If fail safe happens, the spring strokes the valve into the desired position while extra air pressure force is maintained Toughest services construction Corrosion resistant construction High seating force Special anti-cavitation and noise attenuator cartridges optional Heavy duty plug stem available Compact, easy installation The piston cylinder actuator is smaller in size than comparable spring diaphragm actuators Lower center of gravity than comparable spring diaphragm actuators Valve weight lighter means reduced dynamic and static load on the pipeline Separable end flanges allow for multiple installation patterns thus compensating for any flange misalignment Life time lower cost design High interchangeability between sizes and other Optimux products during the valve service life time. Valve design allows for a low inventory of parts Heavy duty designed parts assure a longer servicing life The piston cylinder actuator design permits easy and simple maintenance operations High performance four-way Positioners Pneumatic 3-15 psi Eletropneumatic 4-24 ma Digital 3
5 End connections, Flanges and Bolting OpGL body facings come standard as raised face for either separate and integral flanges. To achieve better sealing with mating piping, the flange face is machined with spiral groove serrations. Other optional facings include smooth face, flat face, ring joint, large and small tongue and large and small groove. Separable End Flanges Interchangeable separable flanges are standard for valve bodies through 4 inch in class 150, 300, and 600 ANSI ratings. With separable end flanges, a class 600 body can be adapted for class 150, 300, or 600 service by simply changing the end flanges. Separable flanges are usually furnished in carbon steel for maximum cost savings, although stainless steel can be specified if process atmosphere or extreme temperature requires it. Figure 6: Separable flanges Bonnet Flanges The bonnet flange incorporates the same separable design as the end flanges. It is normally manufactured in carbon steel; however, it too can be specified in stainless steel when required. Bonnet Flange Bolting Standard bonnet utilizes screwed studs and nuts. Standard material for the studs are ASTM A 193 Gr B7 and nuts ASTM A 194 Gr 2H, suitable for temperatures between -20 F to 800 F (-29 C to 426 C). Studs and nuts can be also furnished in stainless steel and are suitable for temperatures between -423 F to 1500 F (-253 to 816 C). These temperature limits are for maximum pressure permitted by ASTM B Table I: End connections End Valve ANSI Standard Optional Connections size class Face-to- Face-to- (inches) face face Separable Flange 1/ ANSI (a) ISA Integral Flange 1/ ISA Steel & Alloys 1/ ISA 1/ ISA (c) Screwed 1/ ANSI 1/ ISA (c) Socketweld 1/ ANSI ISA (SW) 1/ ISA (c) Buttweld 1/ ANSI ISA (BW) ISA 1/ ISA (c) (a) ANSI B16 Class 600 Globe valves (b) ANSI/ISA S (c) See Table XVII Fig. 7: Integral Flanges Fig. 8: Socketweld (SW) Fig. 9: Buttweld, (BW) 4
6 Gaskets The OpGL is designed with the bonnet and seat ring gaskets fully retained. Since the bonnet bottoms metal-tometal in the body, the bonnet gasket compression is determined by the depth of the gasket step on the bonnet which is machined to provide the compression required by the gasket manufacturer. When the bonnet is fully installed, force is transmitted through the seat retainer to secure the seat ring in position Seat Ring Gasket Bonnet Gasket Figure 10: Body Gasket Unbalanced Trim The body, seat retainer and seat ring are all machined to close tolerances to provide the proper gasket compression. Unlike the bonnet, the seat ring does not bottom in the body, allowing this small clearance to compensate for manufacturing tolerances and thermal expansion. Retainer Gasket Bonnet Table II: Gasket Specifications Figure 11: Body Gasket Balance trim Type Gasket Material Maximum Gasket Minimum Gasket Temperature Temperature F C F C Estandard Flat Teflon (TFE) Gaskets Spiral Wound 304 SS/ AFG Spiral Wound 316 SS/ AFG Alternate Flat AFG Gaskets Flat KEL-F * -196* Flat Teflon (FEP) Flat Grafoil** 1500** 816** Spiral Wound 316 SS/ Grafoil** 1500** 816** Hollow O-ring Inconel X ** 816** -20* -30* * Lower Temperature on request ** Limited to 800 F (427 C) for oxiding service Seat Ring Gasket 5
7 Bonnet Types Standard Bonnet The OpGL standard bonnet is constructed of the same material as the body, and handles fluid temperatures from -20 F to 750 F (-30 C to 400 C) (See Table on page 8 for packing limitations). Extended Bonnet The extended bonnet protects the packing from excessive heat or cold which may inhibit valve performance. It is constructed of carbon steel for temperatures from -20 F to 800 F (-30 C to 427 C) and of 304 or 316 stainless steel for temperatures from -150 F to 1500 F (-100 C to 816 C). Cold Box Extended Bonnet The cold box extended bonnet permits stagnated, moderate temperature gas to form in the bonnet, which protects the packing from the service fluid. It is usually manufactured from 304 or 316 stainless steel to handle fluid temperatures down to -423 F (-253 C). Standard construction consists of stainless steel bonnet flange and bolting Standard Bonnet Extended Bonnet Cold Box Extended Bonnet Figure 12: Bonnet Types for OpGL Table III : Materials: Bonnet Flanges, Screws Valve size (inches) Standard Bonnet Flange Optional Flange Cap Screws Standard Cap Screws Optional 1/2 to 3 Carbon Steel Stainless Steel (1) SAE Grade 5 SS. Series 300 B7-2H Class Same Body Alloy Stainless steel (4) Material 304 and 316 (3,4) 4 Carbon Steel Stainless Steel (1) B-7; 2H (2) Stainless steel 304 Class Same Body Alloy and 316 (3,4) 6 and above Material Class All pressure class (1) When Pressure and temperature exceeds standard limitations for flanges and bolting constructed in carbon steel, and B7-2H, alloy material is required. (2) Limit temperature from -20 F to 800 F (-29 C to 427 C). See for body temperature limitations. (3) Limit temperature from -428 to 1500 F (-253 C to 816 C). See for body temperature limitations. (4) Other materials are dependable on design configurations. 6
8 Packing and Guiding Packing Box Standard Optimux packing boxes are deeper than most conventional types, providing the following advantages: 1. Wide spacing between the wiper set and the main upper packing set. The upper set is positioned far enough away from the wiper set to avoid contact with any part of the plug stem which has been exposed to the flowing medium. 2. Two widely spaced stem guides, when used with the large plug stem diameter, provide exceptional guiding. The upper stem guide also acts as a packing follower. The lower guide is situated close to the plug head for additional guiding support. Table IV: Guides Material Standard Maximum Minimum Maximum Material Temperature Temperature Pressure F C F C Grafoil lined psig up to 2 inch. Stainless 600 psig 3 and 4 inch. Steel psig 6 inch. and above Glass-loaded F Teflon-lined SS F Solid Bronze Same as the body Solid Stellite Same as the body Upper guide Upper Packing set Wiper Packing set Table V: Packing, Temperature Limitations ANSI Material Standard Bonnet (1) Extended Bonnet (2) Class F C F C Teflon TFE -20 to to Braided PTFE 3-20 to to to to 316 Glass-filled Teflon APFI Asbestos 5-20 to to to to Grafoil 6-20 to to to to 816 Teflon TFE -20 to to Teflon PTFE -20 to to to to 371 Glass-filled Teflon APFI Asbestos 5-20 to to to to Grafoil 6-20 to to to to PTG -20 to to to to PT -20 to to to to PTXT -20 to to to to PTG -20 to to to to PT -20 to to to to PTXT -20 to to to to 426 Lower Guide Figure 13: Teflon V-Ring Typical Arrangement (1) ANSI B16.34 specifies acceptable pres sure temperature limits for pressure retaining materials. Consult Optimux for additional information. (2) When used with adequate body and Teflon TFE Bonnet materials. (3) PTFE can be used in temperatures down to -423 F (-253 C). (4) Sizes from 8 to 12 inches class ANSI and 3 to 12 inches, class ANSI can be used in temperatures up to 850 F (455 C). (5) Asbestos free packing. High temperature packing. (6) Do not use Grafoil above 800 F (427 C) in oxiding service such as air or oxygen. (7) For pressure limitations consult Optimux "Control Valve Selection and Sizing Manual". 7
9 Fugitive Emission Control PTG Packing The Optimux PTG packing complies with the regulations of the EPA (U.S. Environmental Protection Agency) on packing fugitive emissions. Designed as a packing set combination of carbon-filled Teflon backup V-rings, PTG can be installed in all existing Optimux control valves. Provided with a simple and easy retrofittable system, it permits also monitoring whether maintenance procedures have been performed properly. In addition, a fire-safe PTG packing set can be furnished on request in case of fire, the packing set is guaranteed against fluid leaks through the stem, even under packing set damage caused by excess of heat. High density fire-safe Grafoil rings Purge port Dualpacking Set (loaded) (unloaded) Carbon-filled PTFE backups Virgin PTFE V-rings Wiper rings Options Standard Design Figure 14: PTG Packing Set PT Packing When temperature exceeds that specified for the standard V-rings or when a high temperature are expected, PT packing set is recommended. As a cost efficient response to the EPA regulations, the PT packing set provides a typical fugitive emission rate lower than 10 ppm, becoming significantly reliable and more economical than metal bellows seal systems. PT packing can be installed in all Optimux s rotary and globe control valves. It was designed to achieve a longlife expectancy eliminating the needs for packing set retightening. PT packing set is also provided in a firesafe version to prevent leaks through the shaft in case of fire, according to the API 607 standards. High density fire-safe Grafoil rings Purge port Dualpacking Set Carbon-filled PTFE or PEEK backups Kalrez V-rings Wiper rings Options Standard Design Figure 15: PT Packing Set 8
10 Flow Characteristics Equal Percentage Equal percentage is the characteristic most commonly used in process control. The change in flow per unit of valve stroke is directly proportional to the flow occurring just before the change is made. While the flow characteristic of the valve itself may be equal percentage, most common loops will produce an installed characteristic approaching linear when the overall system pressure drop is large relative to that across the valve. Linear Linear inherent characteristic produces equal changes in flow per unit of valve stroke regardless of plug position. Linear plugs are used on those systems where the valve pressure drop is a major portion of the total system pressure drop. Quick Open Quick open plugs are used for on-off services and are designed to produce maximum flow quickly. Figure 16: Flow Characteristics Trim Types Two different trim types are available: standard full area trim which provides maximum Cv. Reduced trim in a wide variety of sizes when lower Cv s and large bodies are required. In addition integral trim that uses a special seat machined into the body and an oversized plug to provide additional Cv beyond the capabilities of standard trim can be furnished. OpGL valves can be easily converted from one trim type to another since all seat rings and plugs within a given size and pressure class are completely interchangeable. Integral trim is available by removing the seat ring and by changing the plug. Figure 17: Typical Trim Types 9
11 Trim, Seats OpGL trim is designed to avoid the difficulties associated with screwed-in seats and cage-guiding. Since the seat ring is not screwed-in but clamped into the body by the bonnet and seat retainer, removal of the seat is easy even under extremely corrosive conditions. Unlike cage-guided trims, which easily gall and stick, OpGL plugs are double stem guided, avoiding contact between the seat retainer and plug. Because no contact is made with the plug, the retainer can be constructed of stainless steel rather than costly hard materials. The flow characteristic is determined by the plug contour, rather than by the opening in the retainer. Optionally gaseous noise attenuation trims can be provided to effectively improve noise level reduction in OpGL valves. For very high pressure drops, pressure-balanced trim is used to reduce the thrust necessary to stroke the plug by reducing the trim off-balance area. Flow direction is under the plug for fail-closed and over the plug for fail-open. The seal area less the stem area is designed to be slightly larger than the seat area, thus the plug is off-balance to close for flow under the seat and off-balance to open for flow over the seat. Stem Guide Bonnet Bonnet Seat Retainer Plug Seals Plug Seat Ring Plug Vents Plug Pressurebalanced Sleeve Figure 18: Standard Trim Figure 19: Balanced Trim Seats Metal Seats Metal seated OpGL handless Class IV shutoff (ANSI B16.104; 1976-FCI 70-2). This class calls for maximum permissible seat leakage of 0,01% of rated valve capacity. This exceptional seat tightness is obtained by aligning the seat ring with the plug during assembly. Additional seat tightness using metal seats is available as an option. Table VI: Plug Seals Temperature Range for Pressure-balance Trim Teflon Seal -320 full body rating or psig Ni-resist Piston Rings -22 F to 800 F Buna-N O-rings -60 F to 250 F Rene F to 1600 F Spring-reinforced -365 F to 575 F TFE Viton -40 F to 437 F Soft Seats The OpGL soft seat is used in applications requiring ANSI Class VI "bubble-tight" shutoff. It s design consists of an elastomer sandwiched between two metal pieces. The assembled soft seat is interchangeable with the hard seat for a given size and pressure rating. Inserts are often constructed of Teflon, therefore, maximum temperature should be below 150 C at 20 Barg. For temperatures below -65 C, Teflon soft seats can be used in high pressure applications. 10
12 Trim, Materials Table VII: Wear and Galling Resistance of Material Combinations Standard plug and seat ring material is 316 stainless steel, except in the case of special alloy bodies where trims are sometimes furnished in the same material as the body. A wide variety of fluids are successfully handled by stainless steel trim parts. Nevertheless, as a general rule hard trim must be used for all chocked flow conditions or for temperatures above 600 F (316 C). Optimux keeps a large stock of no. 6 Stellite trim parts. This material offers a good combination of relative hardness and corrosion resistance. Special alloys such as Alloy 20, Hastelloy C and Monel can be furnished on request. 304 stainless steel 316 stainless steel Bronze Inconel 600 Monel 400 Hastelloy B Hastelloy C Titanium 75A Nickel Alloy Hard. 440 Hard PH Stellite NDE* Cr. Plate Al. Bronze 304 stainless steel P P G P P P G P P P G G G G G G G 316 stainless steel P P G P P P G P P P G G G G G G G Bronze G G E E E E E E E E G G G G G G G Inconel 600 P P E P P P G P G G G G G G G G E Monel 400 P P E P P P G G G G G G G E G G E Hastelloy B P P E P P P G G E G G G G E G E E Hastelloy C G G E G G G G G G G G G G E G E E Titanium 75A P P E P G G G P G G G G G E G G E Nickel P P E G G E G G P P G G G E G G E Alloy 20 P P E G G G G G P P G G G E G G E 416 Hard. G G G G G G G G G G G G G E E E E 440 Hard. G G G G G G G G G G E G E E E E E 17-4 PH G G G G G G G G G G G E P E E E E Stellite G G G G E E E E E E E E E E E E E NDE* G G G G G G G G G G E E E E P E E Cr. Plate G G G G G E E G G G E E E E E P S Al. Bronze G G G E E E E E E E E E E E E E P * Electrolytic Nickel Coating E: Excellent, B: Good, P: Poor Table VIII : Pressure Differential (psi) Requiring Hardened Seating Surfaces Valve Gases Steam Steam Water Process Fluids Size (clean) (superheated) (saturated) (general) (inches) Control On-Off Control On-Off Control On-Off Control On-Off Control On-Off Psi Bar Psi Bar Psi Bar Psi Bar Psi Bar Psi Bar Psi Bar Psi Bar Psi Bar Psi Bar 1/2 a 11/ All applications All applications Table IX: Trim Material Characteristics Trim Hardness Impact Corrosion Maximum Erosion Abrasion Material Rockwell C Strength Resistance Temp. Recomm. Resistance Resistance ºF ºC 316 Stainless steel 8 Excellent Excellent Fair Fair nº 6 Stellite 44 Excellent Excellent Good Good 416 Stainless steel 40 Good Fair Good Good 17-4 PH 44 Good Good to H 900 Excellent Good Good 440 C Stainless steel Fair Fair Excellent Excellent K Monel 32 Good Good to Fair to Excellent Good Good Tungsten Carbide 72 Fair Good on bases Poor on acids Excellent Excellent Colmonoy nº Good Fair Good Good 11
13 Standard Construction Materials Configurations Materials Lubrication (optional) Type Materials Table X: Packing Standard: twin seal Vacuum seal Teflon V-rings, Teflon, Teflon AFP* AFP/Inconel wire, glass-filled Teflon Grafoil and other materials as required Lubricator with integral isolation valve Lubricator and isolation valve Table XI: Guides Double-top stem guide Glass-filled Teflon, Grafoil, solid Stellite, solid Bronze, other materials as required Table XIV: Trim Flow Equal percentage, linear, quick open Characteristics Materials 316 Stainless steel Alloy Stainless steel Nickel 347 Stainless steel Titanium 416 Stainless steel Monel Hastelloy B 17-4 PH Hastelloy C 440 C Hardened Materials: nº 6 stellite, Colmonoy nº 5 Seating Types:seat surface, full contour, Surfaces full bore, lower guide area Soft Seat TFE Teflon, FEP Teflon, KEL-F, polyurethane, PEEK Balanced Sizes: 2 inches and above Trim Seals type: Elastomer, Metal Types and Materials Table XII: Gaskets Spiral wound: 304 or 316 Stainless steel/ asbestos-free; Teflon, Grafoil, Flat: Teflon, soft metal Metal O-ring: Inconel X750/ silver plated Table XIII: Body Materials Sizes 1/2-48 inch; class 150 thru 600 1/2-24 inch; class 900 thru /2-12 inch; class 4500 Forms Globe, angle, 3 way ANSI Ratings Class 150, 300, 600, 900, 1500, 2500 Materials Carbon steel, Stainless steel, Monel Nickel, Chrome-Moly, Titanium, Alloy 20, Bronze, hastelloy B, Hastelloy C, other castable materials End connections Separable flange: 1/2-4 inch, class 150 thru 600 Integral flange: all sizes NPT: 1/2-4 inch Grayloc: all sizes Socketweld: 1/2-4 inch Separable end Carbon steel, 316 Stainless steel, Flange material other material as required Types Flanges Materials Name Plate Table XV: Bonnet Materials Standard, extended, special length extended, bellows seal, cryogenic extended Separable Bonnet: Same as body Bellows: Stainless steel, other material as required Bellows Housing: carbon steel, 316 stainless steel, other materials as required Bonnet Flange: carbon steel, 316 stain less steel, other materials as required Valves are equipped with stainless steel name plate, as the example illustrated below. S/N OpGL SIZE CLASS T/N CV CHAR AIR TO SIGNAL BODY TRIM TAG P.O. 12
14 Flow Capacity; C v Trim: Unbalanced Body Rating: Trim Characteristics: Equal Percentage Flow Direction: Flow Over Flow Over Table XVI: Flow Capacity, C v Size Trim Stroke FL@ C v at Percent Open (inch) nº (inch) 100% / A B A / A B A A A /
15 OpGL Flow Capacity; C v Trim: Unbalanced Body Rating: Trim Characteristics: Equal Percentage Flow Direction: Flow Under Flow Under Table XVII: Flow Capacity, C v Size Trim Stroke FL@ C v at Percent Open (inch) nº (inch) 100% / A B A / A B A A B A / s
16 Flow Capacity; C v Trim: Unbalanced Body Rating: Trim Characteristics: Linear Flow Direction: Flow Over Table XVIII: Flow Capacity, C v Flow Over Size Trim Stroke FL@ C v at Percent Open (inch) nº (inch) 100% / A B A / A B A A B A /
17 OpGL Flow Capacity; C v Trim: Unbalanced Body Rating: Trim Characteristics: Linear Flow Direction: Flow Over Tabla XIX: Flow Capacity, C v Flow Under Size Trim Stroke FL@ C v at Percent Open (inch) nº (inch) 100% / A B A / A B A A B A /
18 Dimensions Table XX: Valve Dimensions (mm) - Class 150, 300, 600 Space Body A B needed for Size ANSI/Globe* ANSI/ISA** Standard Extended C disassembling (inch) Class Class Class Class Bonnet Bonnet above 150, 300, actuator 1/2 & 3/ / *Optimux standard in accordance with ANSI/ISA S75.20, 1992 **In accordance with ANSI/ISA S75.03, 1985 For threaded ends, consider 210 Table XXI: Valve Dimensions (mm) - Classes 900, 1500, 2500 Body A B Space C needed for Size Distance between flanges* Standard Bonnet Extended Bonnet disassembling (inch) Class Class Class Class Class Class Class Class Class Class Class Class Class / *ANSI/ISA S75.15, 1987 (1) ANSI/ISA S75.16, 1987 (2) Optimux standard 17
19 Dimensions Table XXII: Dimensions (mm) - Angle Body B A Space Body ANSI needed (inch) Class Standard Extended for bonnet bonnet disassembling 1/2 a a /2 150 a a a a a a Table XXIII: Dimensions (mm) - 3-way Body Body A Space B C D K Size ANSI/Globe* ANSI/ISA** for (inch) Class Class Class Class Standard Extended disassembling 150, 300, Bonnet Bonnet 1/2 & 3/ / * In accordance with ANSI B16.10, 1986 ** In accordance with ANSI/ISA S75.03, For threaded ends, consider
20 OpGL The information and specifications described in this brochure are considered accurate, however they are intended for information purpose only and should not be considered as certified information. Considered that Optimux products are continuously improved and upgraded, specifications, dimensions, and information described herein are subject to change without notice. For further information or verification, consult your Optimux representative. Specific instructions for the installation, operation, troubleshooting and maintenance of the OpGL control valves are contained on the OpGL Maintenance bulletin. Hastelloy C is a trade mark of Cabit Corporation Monel, Inconel are trade mark of Huntington Ally Teflon is a trade mark of E. I. DuPont Company Stellite is a trade mark of Stoody Debro For more information, visit our website at Cat. Optimux OpGL Rev.01 ENG-09/2002 Printed in USA
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