98 Series Back Pressure. Valve Link. Features. Fisher Controls. August 1993 Bulletin 71.4:98

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1 Series Back Pressure and Type Relief VL000 Valves FIELDVUE Valve Link Fisher Controls August Bulletin.: The Series (figure ) is used for back pressure or relief applications in liquid, gas, air, and steam service. The Types L, H, and HH are self-operated and springloaded, while the Types LD and HD use additional pressure loading to maintain relief differential relief pressure settings, or for remote set point adjustment. Features Versatility Typical applications include back pressure on pumps, maintaining differential pressure across lubricated seals, steam header pressure, fuel and oil lines, air supply systems, and other process and industrial uses. Excellent Fluid Compatibility Diaphragms come in stainless steel or elastomers, and body and spring case are available in stainless steel as well as cast iron and steel. Corrosion-resistant trims are available. Close, Stable Regulation Diaphragm is isolated from the main flow stream. Slotted valve plug and pusher post assembly (figure ) provides positive guiding for improved shutoff. Compact Design Small size allows easy installation in limited spaces. Differential Pressure Capability Spring-loaded TFE packing and tapped connections permit pressure loading of Type LD and HD spring cases. Handwheels Handwheels (standard on the Types LD and HD and optional on some sizes of the Types L and H) allow easy pressure setting changes. Sour Gas Service Capability Optional materials are available for applications handling sour gases. These constructions comply with the recommendations of National Association of Corrosive Engineers (NACE) MR0-. W TYPE H W TYPE LD W Figure. Typical Series Relief Valves TYPE HD W TYPE L D00X0 Fisher Controls International Inc., ; All Rights Reserved

2 .: page Specifications Available Constructions Types L, H, HH: Self-operated with standard adjusting screw Types LD and HD: Pressure-loaded with handwheel adjustment Body and Orifice Sizes BODY SIZE (INCHES) Types H & HD All Other Types / / /, -/, / / /, Not available ORIFICE SIZE (INCHES) / / / -/ End Connection Style NPT screwed, ANSI flanged- inches face to face (DIN flanged-mm face to face), or SWE Construction Materials Body and Spring Case: Cast iron, steel, or stainless steel Spring: Steel Trim and Diaphragm: See table NACE Construction Body: Heat treated steel Spring Case: Steel Orifice: stainless steel O-Ring Seat: Nitrile or fluoroelastomer Valve Plug Guide: stainless steel Pusher Post: stainless steel Diaphragm Retaining Washer: stainless steel Spring: Steel Diaphragm: Neoprene or fluoroelastomer Maximum Inlet Pressures, Psig (,) (Set Pressure Plus Buildup) STEEL (WCB) OR STAINLESS STEEL TYPE BODY. ALL NUMBER TRIMS TO 0 F () ( C) L LD H HD () 0 () 00 () 00 () CAST IRON BODY Metal Trims () All Trims to 0 F () ( C) To F To 0 F ( C) ( C) 0 () 0 () 0 () 00 () HH 00 () 00 () 00 () 0 () Relief Pressure Ranges See table Allowable Temperature Ranges () Nitrile Parts: to 0 F ( to C) Neoprene Parts: 0 to 0 F ( 0 to C) Fluoroelastomer Parts: 0 to 00 F ( to C) Metal Diaphragm and Seat Cast Iron Body and Spring Case: 0 to 0 F ( 0 to C) Steel Body and Spring Case: to 0 F ( to C) Stainless Steel Body and Spring Case: 0 to 0 F ( 0 to C) Maximum Spring Case Loading Pressures, Psig for Types LD and HD Only (Spring Setting Plus Loading Pressure) (,) STEEL (WCB) OR STAINLESS STEEL TYPE CASE. ALL NUMBER TRIMS TO 0 F () ( C) LD HD () 00 () CAST IRON CASE Metal Trims () All Trims to 0 F () ( C) To F To 0 F ( C) ( C) 0 () 0 () 0 () 0 () Capacities Types L and LD: See tables - Types H and HD: See tables - Type HH: See tables - Shutoff Classification Per ANSI/FCI 0-- (R0) Metal Seats: Class IV is standard optional. PTFE and Elastomers Seats: Class VI Km Values (Recovery Coefficients) /-inch Body Size:. Km /-inch Body Size:. Km / and -inch Body Size:. Km -/ and -inch Body Size:. Km 0 () () Options Handwheel or tee handle for Types L and H Tapped spring case vent for Types L and H Seal washer to permit spring case pressure loading for Types L and H. Relief pressure setting plus maximum allowable buildup over setting.. The pressure/temperature limits in this bulletin and any applicable standard. Or fluoroelastomer trims to 00 F ( C) or metal trims to 0 F ( C). limitation should not be exceeded.. Or fluoroelastomer trims to 00 F ( C).. Loading pressure plus spring setting should not exceed maximum inlet pressure.. Interpolate for intermediate pressure ratings.

3 .: page TFE PACKING PACKING TAPPED LOADING PRESSURE CONNECTION W00 * O-RING O-RING RETAINER W00 VALVE PLUG AND PUSHER POST ASSEMBLY USED IN SERIES TYPE L WITH COMPOSITION SEAT W00-* TYPE LD WITH METAL SEAT Figure. Typical Low-Presure Constructions Table. Trim Materials Elastomer Seat Standard Optional Orifice O-ring retainer Valve plug Valve plug guide Pusher post Diaphragm retaining washer Diaphragm O-ring seat Orifice Valve plug Valve plug guide Pusher post Diaphragm Diaphragm retaining washer stainless steel stainless steel stainless steel stainless steel stainless steel stainless steel Neoprene Nitrile stainless steel stainless steel stainless steel stainless steel stainless steel Fluoroelastomer Fluoroelastomer Metal Seat Standard Optional stainless steel, hardened stainless steel, hardened stainless steel stainless steel 0 stainless steel Not used stainless steel, Hast C stainless steel, Hast C stainless steel, Hast C stainless steel, Hast C Neoprene, Fluoroelastomer stainless steel Table. Spring Ranges for Relief or Differential Relief Pressures Type Number L & LD H & HD Nominal Body Size (Inches) /, /, / and /, /, / and H & HD -/ and Spring Range (Psig or Psi) () Spring Color Code Dark Gray Light Light Gray Black /, /, HH 0- Silver / and. All springs may be backed off to 0 psig. However, highest capacities and best rather than psig are used for differential relief constructions. performances are obtained by using these springs in their recommended ranges. Psi

4 .: page Table. Water Relief Capacities in Gallons per Minute, Types L and LD with Composition Diaphragm INCHES Part Number Color Code E0 (0.) (0.) GPM E0 0 (0.) / E L E0 (.0) (.) (.) (.) 0 (.) (0.) (0.) D 0 (0.) / E L00 E0 (.0) (.) (.) (.) 0 (.) (0.) (0.) E0 0 (0.) /, E L0 (.0) (.) (.) (.) 0 (.) Table. Water Relief Capacities in Gallons per Minute, Types L and LD with Metal Diaphragm INCHES Part Number Color Code E0 (0.) (0.) GPM E0 0 (0.) / E L E0 (.0) (.) (.) (.) 0 (.) (0.) (0.) D 0 (0.) / E L00 E0 (.0) (.) (.) (.) 0 (.) (0.) (0.) E0 0 (0.) /, E L0 (.0) (.) (.) (.) 0 (.)

5 .: page Table. Steam Relief Capacities in Pounds per Hour, Type L with Metal Diaphragm Only INCHES Part Number Color Code E0 (0.) (0.) LB/H E0 0 (0.) 0. 0 / E L E0 (.0) (.) (.) (.) 0 (.) (0.) (0.) 0 D 0 (0.) 0 / E L00 E0 (.0) (.) (.) (.) 0 (.) (0.) (0.) E0 0 (0.) /, E L0 (.0) (.) (.) (.) 0 (.) Table. Air and Gas Relief Capacities in Scfh, Type L with Composition Diaphragm INCHES Part Number Color Code E0 (0.) (0.) SCFH E0 0 (0.) / E L E0 (.0) (.) (.) (.) 0 (.) (0.) (0.) D 0 (0.) / E L00 E0 (.0) (.) (.) (.) 0 (.) (0.) (0.) ,00,000 E0 0 (0.) ,000,00,00 /, E L0 (.0) (.) (.) (.) 0 (.) ,000, ,000 0,000,000,000 0,000,000,000,000,000,000,00,000,000,000,000,000,00,00,000,000,000,000,00,0,00,00,000,000

6 .: page Table. Air and Gas Relief Capacities in Scfh, Type L with Metal Diaphragm INCHES Part Number Color Code E0 (0.) (0.) SCFH E0 0 (0.) / E L E0 (.0) (.) (.) (.) 0 (.) (0.) (0.) D 0 (0.) / E L00 E0 (.0) (.) (.) (.) 0 (.) (0.) (0.) ,000 E0 0 (0.) ,00 /, E L0 (.0) (.) (.) (.) 0 (.) , ,000, ,000,000,000,000,000 0,00 0,,000,000,000,000,0,00,,,000,000

7 .: page Table. Water Relief Capacities in Gallons per Minute, Types H and HD with Composition Diaphragm INCHES Part Number Color Code / / /, -/, E0 E0 E L E0 D E L00 E0 E0 E L0 E0 E0 E0 P0 Dark Gray Light Light Gray Black (.0) (.) 00 (.) (.) 0 (0) () 0 () (.0) (.) 00 (.) (.) 0 (0) () 0 () (.0) (.) 00 (.) (.) 0 (0) () 0 () (0.) 0 (0.) (.0) (.) (.) (.) 00 (.) 00 (.) (.) 0 () GPM

8 .: page Table. Water Relief Capacities in Gallons per Minute, Types H and HD with Metal Diaphragm INCHES Part Number Color Code / / /, -/, E0 E0 E L E0 D E L00 E0 E0 E L0 E0 E0 E0 P0 Dark Gray Light Light Gray Black (.0) (.) 00 (.) (.) 0 (0) () 0 () (.0) (.) 00 (.) (.) 0 (0) () 0 () (.0) (.) 00 (.) (.) 0 (0) () 0 () (0.) 0 (0.) (.0) (.) (.) (.) 00 (.) 00 (.) (.) 0 () GPM

9 .: page Table 0. Stream Relief Capacities in Pounds per Hour, Type H with Metal Diaphragm Only INCHES Part Number Color Code / / /, -/, E0 E0 E L E0 D E L00 E0 E0 E L0 E0 E0 E0 P0 Dark Gray Light Light Gray Black (.0) (.) 00 (.) (.) 0 (0) () 0 () (.0) (.) 00 (.) (.) 0 (0) () 0 () (.0) (.) 00 (.) (.) 0 (0) () 0 () (0.) 0 (0.) (.0) (.) (.) (.) 00 (.) 00 (.) (.) 0 () LB/H

10 .: page 0 Table. Air Relief Capacities in Scfh, Type H with Composition Diaphragm INCHES Part Number Color Code / / /, -/, E0 E0 E L E0 D E L00 E0 E0 E L0 E0 E0 E0 P0 Dark Gray Light Light Gray Black (.0) (.) 00 (.) (.) 0 (0) () 0 () (.0) (.) 00 (.) (.) 0 (0) () 0 () (.0) (.) 00 (.) (.) 0 (0) () 0 () (0.) 0 (0.) (.0) (.) (.) (.) 00 (.) 00 (.) (.) 0 () SCFH , 0, ,000,000,000,000,000, ,000,,000 0,000,000, 0 0,,000 0,000,000,000,000,000,000,000,000,000,000,000,000 0,000,000,000, , ,000, ,000,000,000,,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000, ,000 0,000,000,000 0,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 0,000, ,000,000,000,000,000,000,000,000,,,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,00,000,000,000,000,000,000,000,000,000, ,000, , 0,,000,,,000,000,000,000,000,,,00,00,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 0,000 0,000,000 0,000,000,000,000 00, ,,,000,000,000 0,,000,00,000,000,000,000,000,000,000,,,000,000,000,000,000,000,000 0,000,000,000,000,000,000,00,000,000,00,000,000,000,000 0,000,000 0,000,000, ,000,000,000,000,00,00,00,00,000,000,000,000,000,000,000 0,000,,,000,000,000,000,000,000 0,000,000,000,000 0,000,000,000,000,000,000 0,00,000,000 00,000,000 0,000 0,000,000,000,000

11 .: page Table. Air Relief Capacities in Scfh, Type H with Metal Diaphragm INCHES Part Number Color Code / / /, -/, E0 E0 E L E0 D E L00 E0 E0 E L0 E0 E0 E0 P0 Dark Gray Light Light Gray Black (.0) (.) 00 (.) (.) 0 (0) () 0 () (.0) (.) 00 (.) (.) 0 (0) () 0 () (.0) (.) 00 (.) (.) 0 (0) () 0 () (0.) 0 (0.) (.0) (.) (.) (.) 00 (.) 00 (.) (.) 0 () SCFH ,000 0,,000, ,000 0,, , ,,,,000,000,000,000,000,000 0,,,000 0,000,, , ,000,000,000,,000,000,,000,000,000,000,000,000,000,000,000, ,000 0, ,000,000 0,000,000,000,000,000,000,000 0,000,000,000,000,000,000 0,000,000,000,000 0,000, ,00,00,000,000,000,000,000,000,000,000,000,000,000,00,000,00,000,000,000,000,000 0,000,000 0,000 0,000,000,000, , ,000,000 0,000,000,000,,00,00,000,000,000,000,000,000,000,000,000 0,000,00,000,000,000,00 0,000,000,000,000,000,000,000,000, ,000,000 0,000,000,000,000,000,000,,00,00,000,000,000,000,000,000,000 0,000,000,00,000,000,000,000,000,000,000,000,000 0,000,000 0,000 0,000,000, , ,00,0,000,,000,000,000,000,000,000,000,000,000,00,00,000 0,000 0,000,000,000,000,000,000,000,00,000,000,00,000,000,000,000,000 0,000,000,000,000 0,000, ,000 0,000,000,000,00,00,00,,00,000,000,000,000,000,000,000,,000,000,000,00,000,000 0,000,000 0,000,000 0,000,00,00,000,00 0,000,000,,00,00, 0,00 00,000,,000,000,000

12 .: page Table. Water Relief Capacities in Gallons per Minute, Type HH with Composition Diaphragm PART NUMBER OF ZINC PLATED INCHES GPM / N 0 (0) () 0 () 0 () 00 () () / N 0 (0) () 0 () 0 () 00 () () /, N 0 (0) () 0 () 0 () 00 () () Shaded areas show where maximum inlet pressures are exceeded. Table. Water Relief Capacities in Gallons per Minute, Type HH with Metal Diaphragm PART NUMBER OF ZINC PLATED INCHES GPM / N 0 (0) () 0 () 0 () 00 () () / N 0 (0) () 0 () 0 () 00 () () /, N 0 (0) () 0 () 0 () 00 () () Shaded areas show where maximum inlet pressures are exceeded.

13 .: page Table. Steam Relief Capacities in Pounds per Hour, Type HH with Metal Diaphragm Only PART NUMBER OF ZINC PLATED INCHES LB/H / N 0 (0) () 0 () 0 () 00 () () / N 0 (0) () 0 () 0 () 00 () () /, N 0 (0) () 0 () 0 () 00 () () Shaded areas show where maximum inlet pressures are exceeded. Table. Air and Gas Relief Capacities in Scfh, Type HH with Composition Diaphragm PART NUMBER OF ZINC PLATED INCHES SCFH / N 0 (0) () 0 () 0 () 00 () () , ,000 0,, ,, ,000000,, ,000,,000,000 0,,000,000,000,,000,000,000,,000,000,000 / N 0 (0) () 0 () 0 () 00 () () ,000,000,000,,,,000,000,000,,000,000,000,000,000,000,000,000,000,,000000,000,000,000,000,000,000,000 0,000,000,,000,000,000,000,000,,000,000,000,000 0, /, N 0 (0) () 0 () 0 () 00 () () , ,,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 0,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 0,000,000,000,000,000,000,000,000,000,000 Shaded areas show where maximum inlet pressures are exceeded.

14 .: page Table. Air and Gas Relief Capacities in Scfh, Type HH with Metal Diaphragm PART NUMBER OF ZINC PLATED INCHES SCFH / N 0 (0) () 0 () 0 () 00 () () , , , ,000000, / N 0 (0) () 0 () 0 () 00 () () ,000,000, ,000,000000, ,000,000,000,000,,,, ,000,000,000,000 /, N 0 (0) () 0 () 0 () 00 () () , 0,000 0,,000,000,000,,,,000,,000,000,000,000,000,,,000,000,000,000,000,000 0,000,000,000,000,000,000,000,000,000000,000,000,000,000 Shaded areas show where maximum inlet pressures are exceeded. Principle of Operation The chart in Figure illustrates the operation of a /-inch body used in air service. As the inlet pressure increases, initial flow occurs at the bubble point of 0. psig (0. bar). Flow increases with further rises in the inlet pressure, reaching scfh at the relief pressure setting of psig (0. bar). Greater capacities are obtained with higher buildups over the relief pressure setting, as shown in the capacity tables. When the inlet pressure decreases, flow decreases until the valve reseals to reseat point of psig (0. bar). Once the valve has resealed, leakage will not occur again until the bubble point pressure of 0. psig (0. bar) is reached. Table shows typical pressure differences between the relief pressure setting and the bubble point, and between the relief pressure setting and the reseat point. These differences are to be used in conjunction with the capacity tables to determine the total inlet pressure increase required to develop the tabulated flows and to determine the actual inlet pressure reductions required for reseat point. Figure. Typical Bubble Point and Reseat Point Performance Capacity Information Regulating capacities at selected pressures and outlet pressure flows are given in scfh (0 F and. psia) of air at 0 F. To determine the equivalent capacities for other gases, multiply the table capacities by the following appropriate conversion factors:. for 0. specific gravity natural gas, 0.0 for propane, 0.0 for butane, or.0 for nitrogen. For gases of other specific gravities, multiply the given capacity by 0., and divide by the square root of the appropriate specific gravity. Then, if capacity is desired in normal cubic meters per hour at 0 C and.0 bar, multiply scfh by 0.0.

15 .: page Table. Bubble and Reseat Points Below Relief Pressure Setting, Psig TYPE NUMBER L, LD H, HD COLOR CODE Dark Gray Light Light Gray Black COMPOSITON SEAT Bubble Point Reseat Point Bubble Point /-Inch Body NA () NA () NA () NA () METAL SEAT Reseat Point /, / & -Inch Bodies 0 NA () NA () NA () NA () -/ and -Inch Bodies Type H Only NA () NA () NA () NA () NA () NA () NA () NA () HH Silver NA (). Size-spring combination not available in this type. Sizing Determine Flow Rates for units used as differential relief valves as follows: Air and Steam Service When the capacity tables do not cover the actual service conditions, it will be necessary to calculate the flow rate available from the relief valve. Step. From the capacity tables determine a flow rate using the closest available data for set point and build-up. With this information, calculate a flow coefficient using the following: Equation : C g = Q P a P Sin Deg GT C P C g = Calculated flow coefficient Q = Flow rate from tables (SCFH) P a = Inlet pressure from table (set pressure and build-up) converted to absolute pressure G = Specific gravity T = Absolute temperature of gas at inlet degrees Rankine = F + 0 P = Absolute inlet pressure, psia = psig +. C = P = P - P, psid The calculated coefficient is valid for any setting of the selected spring. It is valid only for the specific build-up selected. Step. Calculate the actual flow rate available using the coefficient from Step and the actual inlet pressure (set point plus build-up) and actual outlet pressure (if not atmospheric). Equation. Q scfh = Example. P C g P Sin Deg GT C P Service Conditions: Set point, psi Build-up allowed, 0 psi Outlet discharges to atmosphere Require,0 SCFH air flow rate From Table, select / or -inch body, red spring for 00 psi set point, and 0 psi build-up. The Type H will flow,000 SCFH air. Calculate C g for these table conditions using Equation : P = 00 psig + 0 psig build-up = 0 psig or. psia P = P - P = 0 psid Q =,000 SCFH C = Answer from Equation, C g = 0* *Since build-up relates to travel, this coefficient is valid for all pressure settings on the spring used in the calculation whenever the build-up is 0 psi.

16 .: page Now, solve for actual flow, Q, from the original service conditions using Equation : P = psig + 0 psig build-up = psig or. psia P = 0, therefore P = P - P = psig - 0 = psid C g = 0 (from above) C = Answer from Equation, Q =,000 SCFH rated capacity. Since this capacity is greater than the,0 scfh required, the relief valve may be used or the calculation could be repeated to try for a smaller body size. Example. Service Conditions: Set point, psi Build-up allowed, 0 psi Outlet discharges into pressured system of 0 psi Require 000 SCFH air flow rate From Table, select / or -inch body, blue spring. For 0 psi set point and 0 psi build-up, the Type H will flow 00 SCFH air. Calculate C g for these table conditions using Equation : C g =. from above C = Answer from Equation, Q = 0 SCFH rated capacity. Since this capacity is greater than the 000 SCFH required, the relief valve may be used or the calculation could be repeated to try for a smaller body size. Liquid Sizing for Liquids Other than Water Step. Determine C v at buildup conditions of application. Cv = Q P Q = Flow in gpm from capacity tables P = Pressure drop in psi (set point and buildup) Cv = Valve sizing coefficient Step. To determine flow rate for liquids other than water - or flow rate for differential relief service: Q = Cv G = Specific gravity of fluid P/G P (inlet) = 0 psig + 0 psig build-up = 0 psig or. psia P = P - P = 0 psig - 0 = 0 psid Q = 00 SCFH C = Answer from Equation, C g =.* *Since build-up relates to travel, this coefficient is valid for all pressure settings on the spring used in the calculation whenever the build-up is 0 psi. Now, solve for actual flow, Q, from the original service conditions using Equation : P P = psig + 0 psig build-up = psig or. psia = P - P = 0 psig - 0 psig = psid Maximum Allowable Pressure Drop for Liquid Service Pressure drops in excess of allowable will result in choked flow and possible cavitation damage. To determine max allowable pressure drop for water: P (allow) = Km (P ) P = Valve differential - PSI Km = Valve recovery coefficient from table = Valve inlet pressure psig P To determine max allowable pressure drop for fluids other than water, see Fisher Catalog 0. Installation These valves may be installed in any position, as long as flow will be in the same direction as that of the arrow cast on the body. For dimensionial information see figure.

17 .: page Type Number DIMENSIONS, INCHES Nominal A C (Maximum) J( (Handwheel Body Size, Inches (NPT) NPT or SWE Flanged B Type L, H, Type LD, D E (NPT) Constructions or HH HD Only) / /. L, LD / /.00 /, /.00 / /. H, HD / /.00 /, /.00 H -/,...0. /. / /. HH / /.00 /, /.00 mm / 0 / 0 L, LD / 0 0 / 0 /, / 0 / 0 / 0 H, HD / 0 0 / 0 /, / 0 H -/, / / / 0 HH / 0 0 / 0 /, / 0 Figure. Dimensions

18 .: page NACE Standard MR0- Compliance Optional materials are available for sour gas applications. These constructions comply with the recommendations of National Association of Corrosive Engineers (NACE) MR0-. The manufacturing processes and materials used by Fisher Controls assure that all products specified for sour gas service comply with the chemical and physical requirements of NACE standard MR0-. Ordering Information When ordering, specify:. Type number. Body size. Maximum inlet pressure (relief pressure setting plus maximum allowable buildup over setting). Maximum spring case loading pressure. Relief pressure range. Maximum temperature of process fluid. Body, spring case, and trim materials. Desired options While this information is presented in good faith and believed to be accurate, Fisher Controls does not guarantee satisfactory results from reliance upon such information. Nothing contained herein is to be construed as a warranty or guarantee, express or implied, regarding the performance, merchantability, fitness or any other matter with respect to the products, nor as a recommendation to use any product or process in conflict with any patent. Fisher Controls reserves the right, without notice, to alter or improve the designs or specifications of the products described herein. For information, contact Fisher Controls: Marshalltown, Iowa 0 USA Sao Paulo 0 Brazil Cernay 00 France Singapore 0 Printed in USA