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HomeMy WebLinkAboutTab 2 - PrinceAllModel Check ValveWafer Check Valves 0Tyco reserves the right to change product design and specifications KVUDD-0033-EN-0102 without notice. Copyright © 2000 by Tyco International Ltd. Prince Wafer Check Technical Data Sizes 2-48 inch Features and Benefits • Minimizes piping support with the compact wafer style body. The Prince wafer check valves are two to three times lighter than traditional full- bodied check valves. • Application specific problems are solved with the many Prince options. Options include silicone-free cleaning, oxygencleaning, vertical service valves, left hand valves, levers, weights and cushions. • For media with fibrous matter in it, the external spring protects the fiber from wrapping around the spring and preventing valve closure. • Maintenance is minimal with the field replaceable O-ring seat available in all styles and sizes. Applications The Prince Wafer Check Valve is used to stop flow reversal in chemical refineries, ammonia compressors, waste water treatment plants, HVAC systems and most other industrial applications. Technical Data Size Range : 2 -48 inch Pressure Rating : 150-740 psi ANSI Flange Rating : 125-300 Total Flow Control Solutions Wafer Check Valves Tyco reserves the right to change product design and specifications 2 without notice. Copyright © 2000 by Tyco International Ltd. Product Summary ANSI Pressure Flange Rating Size Body Bushing/ Plug or Outside Series Rating (psi) (in.) Material Disc/Arm Bearing Seat Spring Shaft Seal Hardware Figure 809 300 740 2”–12”Carbon Steel 316 SS N/A TFE 316 SS (Std.) Carbon Steel N/A Inconel 750 Figure 810 125 150 2”–12”Cast Iron 316 SS N/A BUNA-N (Std.) 316 SS (Std.) Carbon Steel N/A EPDM 2–5 inch Fluoroelastomer 17-7 PH SS (Std.) TFE 6–12 inch Metal-to-metal Inconel 750 150 285 2”–12”Carbon Steel 316 SS N/A BUNA -N (Std.) 316 SS (Std.) Carbon Steel N/A 316 SS EPDM 2–5 inch Fluoroelastomer 17-7 PH SS (Std.) TFE 6–12 inch Metal-to-metal Inconel 750 Figure 813 125 150 2”–12”Cast Iron 316 SS Bronze BUNA-N (Std.) 316 SS (Std.) BUNA-N (Std.)• 2 Pos Adjustable EPDM Inconel 750 EPDM Spring (Std.) Fluoroelastomer Fluoroelastomer • Lever TFE • Adjustable Weight Metal-to-metal 150 285 2”–12”Carbon Steel 316 SS Bronze BUNA-N (Std.) 316 SS (Std.) BUNA-N (Std.)• 2 Pos Adjustable 316 SS 316 SS EPDM Inconel 750 EPDM Spring (Std.) Fluoroelastomer Fluoroelastomer • Lever TFE • Adjustable Weight Metal-to-metal Figure 815 125 150 12”–36”Cast Iron 316 SS Bronze BUNA-N (Std.) Carbon St. (Std) N/A • Adjustable Spring EPDM 316 SS • Lever Fluoroelastomer • Adjustable Wt (Std.) Ni-AB • Hydraulic Cushion 316 SS • Limit Switch 150 230 12”–20”Carbon Steel 316 SS Bronze BUNA-N (Std.) Carbon St. (Std.) N/A • Adjustable Spring 316 SS EPDM 316 SS • Lever Fluoroelastomer • Adjustable Wt.(Std.) Ni-AB • Hydraulic Cushion 316 SS • Limit Switch 150 150 24”–48”Carbon Steel 316 SS Bronze BUNA-N (Std.) Carbon St. (Std.) N/A • Adjustable Spring 316 SS EPDM 316 SS • Lever Fluoroelastomer • Adjustable Wt.(Std.) Ni-AB • Hydraulic Cushion • Limit Switch Notes 1. Left hand versions available on all external spring models for horizontal service. 2. Not for use in pulsating or reciprocating services. Wafer Check Valves Check Valve Selection Diagram Tyco reserves the right to change product design and specifications 3 without notice. Copyright © 2000 by Tyco International Ltd. Gather Service Condition Information • Media • Line Size • Temperature, Pressure • Maximum ∆P • Flow, Cv’s • Physical Valve Parameters Prioritize and Evaluate Service Condition Information Select Body Material based on Pressure Conditions and Fluid Compatability Select Appropriate External Spring Material Select Appropriate External Spring Valve with Lever, Weight, Cushion and Limit Switches Select Appropriate External Spring Valve with Lever Select Valve Style Internal vs. External Spring Based on Service Conditions Select Appropriate Seat Material based on Fluid Compatability No Yes No No Yes No Yes No No Yes Yes Internal External Is Valve Body Pressure Rating within ANSI Class 125/150 or 300? Will Service Temperature Conditions be within Seat Material Limitations? Is a Lever and Weight Required? Is Cushioning Required? Are Limit Switches Required? Is a Lever Required? START A Select Appropriate Internal Spring Material Select Appropriate Internal Spring Valve Select Appropriate External Spring Valve with Lever, Weight and Limit Switches Select Appropriate External Spring Valve with Lever and Weight Select Appropriate External Spring Valve with Lever, Weight and Cushion Select Appropriate External Spring Valve Select Appropriate External Spring Valve Consult Factory Yes No No Yes Is Alternate sat Material Available? Are Limit Switches Required? Consult Factory Yes Wafer Check Valves Flow Characteristics Tyco reserves the right to change product design and specifications 4 without notice. Copyright © 2000 by Tyco International Ltd. 100 80 60 40 20 10 8.0 6.0 4.0 2.0 1.0 0.8 0.6 0.4 0.2 0.1 10204060801002004006008001,0002,0004,0006,0008,00010,00020,00040,00060,00080,000100,000200,000400,000600,000800,0001,000,0002”2 / ”123”4”5”6”8”10”12”14”16”18”20”24”30”36”Typical Data – Air Flow at 60° – S.C.F.M. Pressure Drop PSI 2” 21/2” 3” 4” 5” 6” 8” 10” 12” 14” 16” 18” 20” 24” 30” 36” 0.1 85 235 275 360 525 855 1,555 2,875 4,710 5,200 8,565 11,700 16,000 30,600 47,750 77,100 0.2 120 330 390 510 745 1,210 2,200 4,050 6,650 7,350 12,110 16,500 22,550 43,500 67,500 109,000 Flow Coefficient - CV Size 2” 2 1/2” 3” 4” 5” 6” 8” 10” 12” 14” 16” 18” 20” 24” 30” 36” CV 70 190 225 295 430 700 1,270 2,350 3,850 4,250 7,000 9,550 13,000 25,000 39,000 63,000 Disc Cracking Pressure All valves equal approximately 0.5 PSI without lever/weight or cushion. For valves with lever/weight or cushion, contact factory. FLOW - GALLONS PER MINUTEHEAD LOSS - FEET OF WATER - NORMAL OPERATIONNotes 1. Curves are for water at 60°F. 2. Feet of water x 0.4335 = PSI 3. Use curves for estimating purposes only. Performance is based upon ideal inlet and outlet conditions with no springs or weights. Tyco reserves the right to change product design and specifications 5 without notice. Copyright © 2000 by Tyco International Ltd. Wafer Check Valves Technical Information For Gases Pressure Drop = S.G. Where: QV = Flow in standard cubic feet per minute P1 = Upstream pressure absolute (psi + 14.7) G = Specific Gravity of Gas T = Temperature (Rankine) (°F + 460°) CV = Valve flow coefficient from table Note:120 fps is the nominal maximum velocity for gases. For Liquids Pressure Drop = S.G. Where: QL = Flow in gallons per minute S.G.= Specific Gravity of Liquid CV = Valve flow coefficient from table Note: 30 fps is the nominal maximum allowable velocity for liquids. Size – Temperature – Pressure Ratings QL 2 CV QV 2 GT 512 P1 CV 2 Note Where valve construction consists of more than one material, the effective service range of the valve is the same as that of the most restrictive material in the valve. Seat Temperature Ratings NBR 0 – 212°F EPDM -40 – 250°F FKM -40 – 400°F TFE -40 – 300°F Metal Refer to Temp./Pressure Rating Charts 100 200 300 400 500 600 700720 -20 100 200 400300 500 600 690 100 200 -20 100 200 400300 500 600 650 275 300 100 200 230 -20 100 200 400300 500 600 650 Figure 809 Figures 810 & 813 Figure 815 ANSI 300 CS Body SS Disc ANSI 150 CS & SS Body with SS Disc ANSI 125 CI Body with SS Disc ANSI 125 CI Body with SS Disc (12” - 20”) ANSI 150 CS & SS Body with SS Disc (12” - 20”) ANSI 150 CS & SS Body with SS Disc (24” - 36”) ANSI 125 CI Body with SS Disc 30” - 38”) Wafer Check Valves Tyco reserves the right to change product design and specifications 6 without notice. Copyright © 2000 by Tyco International Ltd. Materials of Construction – Metals Part Material Code Common Designation Specification Body 102 Carbon Steel ASTM A-216 WCB 109-1 316 SS ASTM A351 Grade CF8M 134 Cast Iron ASTM A-126 Class B Disc 109-1 316 SS ASTM A351 Grade CF8M Arm 109-1 316 SS ASTM A351 Grade CF8M Disc Arm 109-1 316 SS ASTM A351 Grade CF8M Stem 109-2 316 SS ASTM A-276 GR. 316 164 18-8 SS ASTM A-276 GR. 304 Spring 109-3 316 SS ASTM A-313 Type 316 120 Inconel X750 AMS 5698/5699 201 17-7 PH SS AMS 5673 Cond. C (Age Hardened) Bushing 109-2 316 SS ASTM A-276 GR. 316 149 Sintered Bronze SAE 841 936 Bronze ASTM B505 Alloy C93200 Seat Ring 109-2 316 SS ASTM A-276 GR. 316 162 Nickel Aluminum Bronze ASTM B148 Alloy C955 Materials of Construction – Seals Type Material Code Common Designation Temperature Rating Elastomer 230 BUNA-N 0°to 212°F 414 EPDM -40°to 250°F 440 Fluoroelastomer -40°to 400°F Polymer 500 TFE -40°to 300°F Metal 109 316 SS Refer to the applicable disc temperature rating on Page 13. Note Specifications listed are not all-inclusive. Other specifications may apply. This listing is intended for use as a guideline only. User should determine those materials best suited for their particular application. Assistance is available from Tyco Valves and Controls. Wafer Check Valves Installation Information Tyco reserves the right to change product design and specifications 7 without notice. Copyright © 2000 by Tyco International Ltd. Flange and Bolting Data – Figures 810, 813, and 815 ANSI CLASS 125/150 Size Diameter of No. of Bolt (in.) Bolt Circle Bolts Thread 24 3/4 4 5/8 – 11 21/2 5 1/2 4 5/8 – 11 36 4 5/8 – 11 47 1/2 8 5/8 – 11 58 1/2 8 3/4 – 10 69 1/2 8 3/4 – 10 8 11 3/4 8 3/4 – 10 10 14 1/4 12 7/8 – 9 12 17 12 7/8 – 9 14 18 3/4 12 1 – 8 16 21 1/4 16 1 – 8 18 22 3/4 16 1 1/8 – 7 20 25 20 1 1/8 – 7 24 29 1/2 20 1 1/4 – 7 30* 36 28 1 1/4 – 7 36* 42 3/4 32 1 1/2 – 6 * ANSI Class 125 Only Flange and Bolting Data – Figure 809 ANSI CLASS 300 Size Diameter of No. of Bolt (in.) Bolt Circle Bolts Thread 25 8 5/8-11 36 5/8 8 3/4 – 10 47 7/8 8 3/4 – 10 591/4 8 3/4 – 10 6 10 5/8 12 3/4 – 10 8 13 12 7/8-9 10 15 16 1-8 12 18 16 1 1/8-7 Recommendations for Installation Position 1.Position the check valve to promote smooth flow. 2.Allow clearance for disc movement. 3.Install the valve in horizontal or upward flow for proper valve closure. Caution:Do not use with reciprocating compressors, or in other pulsating services. Note Hinge Position Normal Flow Normal Flow Normal Flow Normal Flow Note Hinge Position CORRECT POSITION INCORRECT POSITION Wafer Check Valves Physical Dimensions Tyco reserves the right to change product design and specifications 8 without notice. Copyright © 2000 by Tyco International Ltd. Figure 809 Valve Dimensions (Inches) Sizes 3-6 inch Size A B *Q D E Wt. (lbs.) 242111/2 4 35 7/8 23 1/16 2 1/16 1 5/8 7 47 1/8 2 1/4 4 1/32 3 1/32 2 1/4 11 58 1/2 2 1/2 5 1/32 3 7/8 315 69 7/8 2 3/4 6 1/16 4 3/4 3 3/4 22 8 11 5 8 5/16 6 5/16 2 1/2 43 10 13 3/8 5 3/4 9 7/8 7 5/8 4 7/16 71 12 16 1/8 7 1/8 12 1/4 9 3/8 5 1/32 107 * The Q dimension is the minimum pipe or companion flange inside diameter for proper valve operation. Figure 810 Valve Dimensions (Inches) Sizes 2-12 inch Size A B *Q D E Wt. (lbs.) 24 1/8 1 3/4 2 1/16 11/2 13/16 4 21/2 4 7/8 1 7/8 2 1/2 1 3/4 1 1/16 5 35 3/8 23 1/16 2 1/16 1 5/8 7 46 7/8 2 1/4 4 1/32 3 1/32 2 1/4 11 57 3/4 2 1/2 5 1/32 3 7/8 315 68 3/4 2 3/4 6 1/16 4 3/4 3 3/4 22 8112 15/16 86 7/16 4 19/32 30 10 13 3/8 3 1/8 10 7 5/8 6 7/16 58 12 16 1/8 3 1/2 12 9 1/2 8 1/8 85 * The Q dimension is the minimum pipe or companion flange inside diameter for proper valve operation. A E D Q A B A E D Q A B Figure 810 – Sizes 2-12 inch Figure 809 – Sizes 3 - 6 inch Wafer Check Valves Physical Dimensions Tyco reserves the right to change product design and specifications 9 without notice. Copyright © 2000 by Tyco International Ltd. Figure 813 Valve Dimensions (Inches) Sizes 2-12 inch Size A B *Q D E F G H J K Wt. (lbs.) 24 1/8 1 3/4 2 1/16 1 1/2 13/16 3 1/16 4 23/32 6 1/2 5 5/32 2 21/32 5 2 1/2 4 7/8 1 7/8 2 15/32 1 3/4 1 1/16 3 5/16 5 7/32 7 1/2 5 7/8 3 3/32 6 35 3/8 23 1/16 2 1/16 1 5/8 3 15/16 5 11/16 8 1/2 6 13/16 3 5/8 9 46 7/8 2 1/4 4 1/32 3 1/32 2 1/4 3 15/16 6 13/32 8 1/2 6 3/4 3 13/32 13 57 3/4 2 1/2 5 1/32 3 7/8 35 15/32 7 7/32 8 3/8 6 19/32 3 1/2 19 68 3/4 2 3/4 6 1/16 4 3/4 3 25/32 5 29/32 7 3/4 8 3/8 6 21/32 3 1/4 24 8112 15/16 7 31/32 6 7/16 4 5/8 6 31/32 9 5/32 9 3/8 7 7/16 3 5/8 32 10 13 3/8 3 1/8 10 7 5/8 6 7/16 5 1/2 10 13/32 10 3/8 8 1/16 4 3/16 60 12 16 1/8 3 1/2 12 9 1/2 8 1/8 6 7/16 12 7/32 12 9 3/8 4 11/16 87 * The Q dimension is the minimum pipe or companion flange inside diameter for proper valve operation. Figure 815 Valve Dimensions (Inches) Sizes 12-48 inch Size A B *Q D E F G H J K L M Wt. (lbs.) 12 16 1/8 4 3/4 12 9 1/2 7 7/8 17 9 17 17 4 7/8 – 9 9 212 14 17 5/8 7 3/4 13 1/4 10 3/16 7 30 13 31/64 21 18 3/4 31 – 8 7 350 16 20 8 3/4 15 1/4 11 8 30 12 61/64 23 21 1/4 41 – 8 8 410 18 21 1/2 8 3/4 17 1/4 12 1/2 10 30 12 61/64 24 22 3/4 31 1/8 – 7 10 450 20 23 3/4 9 3/4 19 1/4 15 12 31 13 1/32 28 25 5 1 1/8 – 7 12 775 24 28 1/4 9 3/4 23 1/4 18 1/2 15 31 13 1/32 32 29 1/2 61 1/4 – 7 15 925 30 34 1/4 9 3/4 29 1/4 23 1/2 22 31 13 1/32 38 36 7 1 1/4 – 7 23 1225 36 41 1/8 14 1/2 35 28 19 3/8 32 13 1/8 44 42 3/4 81 1/2 – 6 18 13/16 2100 42 47 7/8 17 41 33 22 36 15 3/8 47 1/4 49 1/2 81 1/2 – 6 18 13/16 3590 48 54 3/8 20 5/8 47 37 1/2 24 1/4 42 16 1/4 50 3/4 56 10 1 1/2 – 6 18 13/16 4850 * The Q dimension is the minimum pipe or companion flange inside diameter for proper valve operation. A G F H J K PRINCE E D Q A B Figure 813 (with Optional Lever & Weight) Sizes 2-12 inch Figure 815 (with Optional Cushion) Sizes 12-48 inch Open Port F M Q D B E A G K L H Wafer Check Valves Applications Tyco reserves the right to change product design and specifications 10 without notice. Copyright © 2000 by Tyco International Ltd. 2 6 6 11 4 5 5 5 7 3 444 Diagram Key 1.Fractionating column 2.Coolers 3.Distillate drum 4.Distillate reflux and product pumps 5.Sour water pumps 6.Quench oil pumps 7.Quench oil rundown cooler 8.Fuel oil stripping pumps Diagram Key 1. Caustic scrubber 2.Caustic surge tank 3.Three-stage gas compressor 4.Aftercollers 5.Separators 6.Caustic pumps 7.Distillate stripper 2 1 76 8 3 4 5 6 Chemical – Fractionating Column Petrochemical – Compressor and Light End Fractionating Section Legend = Prince Check Valve = Block Valve = Control Valve Legend = Prince Check Valve = Block Valve = Control Valve Distillate Make-up oil Fuel oil Steam Steam Distillate Gas Feed water Caustic Depropanizer chiller To Distillate Reservoir To Benzene Cracker Quench oil From cracking furnace and heat exchangers Wafer Check Valves Applications Tyco reserves the right to change product design and specifications 11 without notice. Copyright © 2000 by Tyco International Ltd. Diagram Key 1.Continuous digester 2.Heat exchanger - calorisator 3.Heat exchanger 4.Condensate vessel 5.Flash tanks Diagram Key 1.Boilers 2.Pumps 3.Expansion tank 4.Fan coil units Legend = Prince Check Valve = Block Valve = Control Valve Legend = Prince Check Valve = Block Valve = Control Valve Steam Condensate Chip Feed 3 1 222 45 5 44 44 2 22 1 1 1 222 3 Pulp and Paper – Continuous Digester HVAC – Three Boiler Water Heating System Presteamer White liquor Black liquor Chip feeder Liquors Switching valves To presteamer Continuous blow down system Cold water supply Wafer Check Valves Material selection guide Tyco reserves the right to change product design and specifications 12 without notice. Copyright © 2000 by Tyco International Ltd. Materials Selection Guide Cast Carbon Stainless Material Iron Steel Steel BUNA-N EPDM Fluoroelastomer TFE Acetaldehyde AAACCBA Acetic Acid, Air Free CCBCACA Acetone AAACCCA Acetylene AAABAAA Alcohols AAAAABA Aluminum Sulfate CCAAAAA Ammonia AAABBCA Ammonium Nitrate CAABAAA Ammonium Sulfate CCAAAAA Asphalt AAACCBA Beer BBAAAAB Benzene AAACCAA Benzoic Acid CCACCAA Boric Acid CCAAAAA Butane AAABCBA Calcium Chloride BBBAAAA Carbolic Acid BBACBAA Carbon Dioxide, Dry AAABAAA Carbon Tetrachloride BBBCCAA Citric Acid CDAAAAA Coke Oven Gas AAABCAA Copper Sulfate CCBAAAA Creosote AAACCAA Ether BBACCBA Ethyl Chloride CCABAAA Ethylene AAABCBB Ethylene Glycol AAAAAAB Fatty Acids CCABCAA Ferric Chloride CCCCBAA Ferrous Chloride CCCCBDA Fluorocarbon Oil CCADCCA Formic Acid CCACCCA Freon 11 CCABCCA Freon 12 CCAADCA Freon 22 CCACCCA Fuel Oil CCAACBA Fruit Juices CBABAAA Gasoline BAACCAA Glucose DDAAAAA Glycols AAAAAAA Green Liquor CCABBBA Helium CBAAABA Hexane AAABCAA Hydrogen Gas BCAAABA Ink CCABBAA Isopropyl Alcohol AAABAAA Kerosene BAAACAA Ketones AAACCCA Lead Acetate CCBAAAA Magnesium Hydroxide CAAAAAA Mash CCABAAA Wafer Check Valves Material selection guide Tyco reserves the right to change product design and specifications 13 without notice. Copyright © 2000 by Tyco International Ltd. Materials Selection Guide (cont.) Cast Carbon Stainless Material Iron Steel Steel BUNA-N EPDM Fluoroelastomer TFE Mercury CAAACDA Methane (Gas)DBAACDA Mine Water (No Salts)CCAAAUD Naptha BAACCAA Natural Gas (No H2S)BAAAAAA Nitrogen Gas AAAAAAA Oxygen Gas AAABAAA Ozone CBACBAA Paint Thinners CBACCAA Pentane AAAACBA Petrolatum AAAACDA Phosphorous CCABCAA Polystyrene Resins CCACCDB Potash CCABAAA Potassium Nitrate CAAAAAA Propane (LPG)BBAACDA Pulp Stock CBAAAAA Sea Water CCBAAAB Sewage BBAAABA Sodium Acetate CBABAAA Sodium Chloride CCBAAAA Sour Gas CBACCAA Steam CBACCDB Toluene AAACCAA Turpentine CBACCAA Vinyl Acetate CAACDCB Vinyl Chloride CCACDDB Water BBABBAA White Liquor CBABBAA Xylene CCACCAA Zinc Chloride CCAAADA Note This information should be used as a general guide only. Many variables other than the chemical resistance will influence the rate of corrosion and materials of construction. Legend A = Can be or is successfully being used B = Proceed with caution C = Should not be used D = Information lacking Wafer Check Valves Tyco reserves the right to change product design and specifications 14 without notice. Copyright © 2000 by Tyco International Ltd. General The check valve shall be a wafer style (flangeless) swing check design utilizing a torsional spring to assist in faster closure. The valve must be capable of gravity closure should the loss of spring tension occur when system back pressure is present. Valves with discs hinged in a line crossing the valve diameter, or with center posts, are unacceptable. Body/Seat The body shall be of the one-piece construction and shall possess a machined dovetail groove for a polymer seal. The seal shall not be vulcanized to facilitate seat retention, and shall be field replaceable. The seal shall provide positive shut-off at both low and high pressure. Disc The valve shall utilize a one-piece disc/arm assembly. The disc shall completely cover the seal when in the closed position to provide positive seal regardless of disc orientation. Disc/Stem Connection The stem shall possess a double “D” design that when mated to the corresponding disc/arm assembly bore provides positive connection. The valve shall be F809 as manufactured by Tyco Valves & Controls. Figure 809 (Internal Spring) Specifications Figure 810 (Internal Spring) Specifications General The check valve shall be a wafer style (flangeless) swing check design utilizing a torsional spring to assist in faster closure. The valve must be capable of gravity closure should the loss of spring tension occur when system back pressure is present. Valves with discs hinged in a line crossing the valve diameter, or with center posts, are unacceptable. Body/Seat The body shall be of one-piece construction and shall (1) possess a machined dovetail groove for elastomer and polymer seals, or (2) possess an integral metal seat machined into the body when metal-to-metal seats are required. The resilient seals shall not be vulcanized to facilitate seat retention. The resilient seals shall be field replaceable. The resilient seals shall provide positive shut-off at both low and high pressure. Disc The valve shall utilize a one-piece disc/arm assembly. The disc shall completely cover the seal when in the closed position to provide positive seal regardless of disc orientation. Disc/Stem Connection The stem shall possess a double “D” design that when mated to the corresponding disc/arm assembly bore provided positive connection. The valve shall be F810 as manufactured by Tyco Valves & Controls. Wafer Check Valves Tyco reserves the right to change product design and specifications 15 without notice. Copyright © 2000 by Tyco International Ltd. General The check valve shall be a wafer style (flangeless) swing check design utilizing a torsional spring to assist in faster closure. The valve must be capable of gravity closure should the loss of spring tension occur when system back pressure is present. Valves with discs hinged in a line crossing the valve diameter, or with center posts, are unacceptable. The valve shall have capability to add lever and/or weight for back-flush capabilities. The lever and/or weight assembly to be field installable. The external spring, lever and weight must be field adjustable. Body/Seat The body shall be of one-piece construction and shall (1) possess a machined dovetail groove for elastomer and polymer seals, or (2) possess an integral metal seat machined into the bodywhen metal-to-metal seats are required. The resilient seals shall not be vulcanized to facilitate seal retention. The resilient seals shall be field replaceable. The resilient seals shall provide positive shut-off at both low and high pressure. Disc The valve shall utilize a one-piece disc/arm assembly. The disc shall completely cover the seal when in the closed position to provide positive seal regardless of disc orientation. Bushing and Disc/Stem Connection The valve shall possess (2) stainless steel or bronze bushings to provide support and alignment to the disc/arm and stem. The stem shall possess a double “D” design that when mated to the corresponding disc/arm assembly bore provides positive connection. The valve shall be F813 as manufactured by Tyco Valves & Controls. Figure 813 (External Spring) Specifications Figure 815 (External Spring) Specifications GENERAL THE CHECK VALVE SHALL BE A SEMI-LUG, SWING CHECK DESIGN UTILIZING A TENSION SPRING TO ASSIST IN FASTER CLOSURE. THE VALVE MUST BE CAPABLE OF GRAVITY CLOSURE SHOULD THE LOSS OF SPRING TENSION OCCUR WHEN SYSTEM BACK PRESSURE IS PRESENT. THE VALVE SHALL HAVE THE CAPABILITY OF ADDING AN ADJUSTABLE HYDRAULIC CUSHION FOR THOSE APPLICATIONS THAT REQUIRE DAMPING SYSTEMS. THE EXTERNAL SPRING (AND THE DAMPING CUSHION) MUST BE FIELD ADJUSTABLE. BODY/SEAT THE BODY SHALL BE OF ONE-PIECE CONSTRUCTION AND SHALL (1) POSSESS A MACHINED DOVETAIL GROOVE FOR ELASTOMER AND POLYMER SEALS, OR (2) POSSESS A STAINLESS STEEL OR NICKEL ALUMINUM BRONZE SEAT RING. THE METAL SEAT RING SHALL HAVE A MACHINED DOVETAIL GROOVE TO MECHANICALLY RETAIN THE ELASTOMER SEAL. NO VULCANIZED BONDING OR CHEMICAL BONDING IS PERMITTED TO FACILITATE SEAT RETENTION. THE SEALS SHALL BE FIELD REPLACEABLE. THE ELASTOMER SEALS TO PROVIDE POSITIVE SHUT-OFF AT BOTH LOW AND HIGH PRESSURE. DISC THE DISC SHALL COMPLETELY COVER THE SEAT RING/SEAL WHEN IN THE CLOSED POSITION TO PROVIDE POSITIVE SEAL REGARDLESS OF DISC ORIENTATION. THE VALVE SHALL BE F815 AS MANUFACTURED BY TYCO VALVES & CONTROLS. Wafer Check Valves Tyco reserves the right to change product design and specifications 16 without notice. Copyright © 2000 by Tyco International Ltd. The data presented in this bulletin is for general information only. Manufacturer is not responsible for acceptability of these products in relation to system requirements. Patents and Patents Pending in U.S. and foreign countries. All rights reserves. Printed in U.S.A. Tyco reserves the right to change product design and specifications without notice. © Copyright 2000. www.tycovalves.com