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Check Valves—C, CA, CH, CP, and CPA Series1www.swagelok.comChe ck Valve sC / CA / CH /CP / CPA SERIESCHECKC, CA , CH, CP, a nd CPA Se r ie s Working pressures up to 6000 psig (413 bar) Adjustable and fixed cracking pressures Variety of end connections 316 stainless steel and brass materials
2Check Valves and Relief ValvesContentsFeatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3Cleaning and Packaging . . . . . . . . . . . . . . . . . . . . . . . . . 10Pressure-Temperature Ratings . . . . . . . . . . . . . . . . . . . .3Ordering Information and Dimensions . . . . . . . . . . . . . . 11Cracking and Reseal Pressures . . . . . . . . . . . . . . . . . . .4Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . 14Materials of Construction . . . . . . . . . . . . . . . . . . . . . . . .5Maintenance Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Flow Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7FeaturesFixed Cracking PressuresAdjustable Cracking PressuresFrom 1/3 to 25 psi (0.03 to 1.8 bar)From 3 to 600 psi (0.21 to 41.4 bar)C SeriesCA SeriesC / CA / CH /CP / CPA SERIESCHECKO-ring sealsbody halvesSpringPoppetCH SeriesLocking screwmaintains settingsFully containedO-ring sealAdjustablespringAdjusting screw setscracking pressureCPA SeriesPoppet withbondedelastomer sealPoppet stopFullycontainedO-ring sealO-ring seals body halvesBackup ring supports O-ringCP SeriesFully contained O-ring sealCompact, one-piece bodyAdjustablespringAdjusting screwsets crackingpressureCompact, one-piece bodyLocking screwmaintainssetting
Check Valves—C, CA, CH, CP, and CPA Series3Technical Data racking pressure—the inlet pressureCat which the first indication of flowoccurs (steady stream of bubbles).Reseal pressure—the pressure at whichthere is no indication of flow.SeriesMaximumFlow Coefficient(Cv)2C0.104C0.476C1.47NominalCracking Pressure➀psi (bar)Maximum Back Pressureat 70 F (20 C)psig (bar)Fixed Cracking PressureBack pressure—the differentialpressure between the inlet and outletpressures. For valves not actuated for aperiod of time, initial crackingpressure may be higher than theset cracking pressure.8C1.6812C, A0.358CPA1.201000 (68.9)➁1/3, 1, 10 and 25(0.03, 0.07, 0.69, and 1.8)1/3, 1, 5, 10 and 25(0.03, 0.07, 0.350.69, and 1.8)200 (13.7)6000 (413)➂5000 (344)➂1/3, 1, 10 and 25(0.03, 0.07, 0.69, and 1.8)Adjustable Cracking Pressure3 to 50 (0.21 to 3.5)50 to 150 (3.5 to 10.4)150 to 350 (10.4 to 24.2)350 to 600 (24.2 to 41.4)3000 (206)3000 (206)For more information about pressure ratings of valves with tube fitting end connections, see Swagelok Tubing Data (MS-01-107), page 224.➀ Other cracking pressures are available; contact your authorized Swagelok sales and servicerepresentative.➁ For cracking pressure of 25 psi (1.8 bar), maximum back pressure is 3000 psig (206 bar).➂ Maximum back pressure may be limited by the end connection. See Dimensions, page 12.C (2C, 4C, 6C, and 8C), CA, CP, and CPA SeriesC Series (12C and 16C)Ratings based on fluorocarbon FKM O-rings in 316 stainlesssteel valves and Buna N O-rings in brass valves.Ratings based on fluorocarbon FKM O-rings in 316 stainlesssteel valves and Buna N O-rings in brass valves.MaterialTemperature, F ( C)–10 (–23) to 100 (37)200 (93)250 (121)300 (148)375 (190)316 SSBrassWorking Pressure, psig (bar)➀3000 (206)3000 (206)2575 (177)2600 (179)2450 (168)2405 (165)2325 (160)—2185 (150)—➀ To reduce the possibility of dislodging the O‑ring in systems wherepressure surges, shock, or pulses occur, for all 2C and 4C series valvesand for 6C and 8C series valves with cracking pressures lower than 50 psi(3.5 bar), an optional inlet gasket is available. See page 14 for orderinginformation. Cracking and reseal pressures may decrease slightly from theranges listed in this catalog.Alternatively, CH or CP series valves should be considered.CH SeriesRatings based on fluorocarbon FKM seals.MaterialSeriesTemperature, F ( C)–10 (–23) to 100 (37)200 (93)250 (121)300 (148)400 (204)316 SSCH4, CH8Working Pressure,6000 (413)➀5160 (355)4910 (338)4660 (321)4280 (294)CH16psig (bar)5000 (344)➀4290 (295)4080 (281)3875 (266)3560 (245)For more information about pressure ratings of valves with tube fitting endconnections, see Swagelok Tubing Data (MS-01-107), page 224.➀ Pressure ratings may be limited by the end connection. SeeDimensions, page 12.MaterialTemperature, F ( C)–10 (–23) to 100 (37)200 (93)250 (121)300 (148)375 (190)316 SSWorking Pressure,2000 (137)1715 (118)1630 (112)1545 (106)1450 (99.9)Brasspsig (bar)1500 (103)1300 (89.5)1200 (82.6)——C / CA / CH /CP / CPA SERIESCHECKPressure-Temperature Ratings
4Check Valves and Relief ValvesCracking and Reseal Pressuresat 70 F (20 C) racking pressure—the inlet pressure at which the firstCindication of flow occurs (steady stream of bubbles). For valves not actuated for a period of time, initialcracking pressure may be higher than the setcracking pressure.Reseal pressure—the pressure at which there is no indicationof flow.Back pressure—the differential pressure between the inletand outlet pressures.C SeriesCH SeriesNominalCracking Pressurepsi (bar)CrackingPressure Rangepsi (bar)1/3 (0.03)Up to 3 (0.21)1 (0.07)Up to 4 (0.28)10 (0.69)25 (1.8)7 to 15(0.49 to 1.1)20 to 30(1.4 to 2.1)ResealPressurepsi (bar)Up to 6 (0.42)back pressureUp to 6 (0.42)back pressure3 (0.21) or moreinlet pressure17 (1.2) or moreinlet pressureNominalCracking Pressurepsi (bar)CrackingPressure Rangepsi (bar)1/3 (0.03)Up to 3 (0.21)1 (0.07)Up to 4 (0.28)3 to 95 (0.35)(0.21 to 0.63)7 to 1510 (0.69)(0.49 to 1.1)20 to 3025 (1.8)CA and CPA SeriesCrackingPressure Rangepsi (bar)1/3 (0.03)Up to 3 (0.21)1 (0.07)Up to 4 (0.28)10 (0.69)25 (1.8)7 to 13(0.49 to 0.90)21 to 29(1.5 to 2.0)ResealPressurepsi (bar)Up to 20 (1.4)back pressureUp to 20 (1.4)back pressureUp to 10 (0.69)back pressure5 (0.35) or moreinlet pressureCracking Pressure, barReseal Pressure, barNominalCracking Pressurepsi (bar)Reseal Pressure, psiC / CA / CH /CP / CPA SERIESCHECKCP Series(1.4 to 2.1)ResealPressurepsi (bar)Up to 6 (0.42)back pressureUp to 5 (0.35)back pressureUp to 2 (0.14)back pressure3 (0.21) or moreinlet pressure17 (1.2) or moreinlet pressureBack PressureCracking Pressure, psi
Check Valves—C, CA, CH, CP, and CPA Series5Materials of ConstructionC and CA SeriesValve Body Materials316 SSComponent11BrassMaterial Grade/ASTM Specification1 Inlet body316 SS/A479Brass 360/B162 Inlet gasket(CA series)2 Inlet gasket (standard for 6Cand 8C series with 50 psi[3.5 bar] spring; optional for2C and 4C series and allother 6C and 8C series) Inlet gasket(12C and 16C series)3 Insert (CA series)PTFE-coated 316 SS/A240PTFE-coated316 SS/A240316 SS/A479PTFE-coatedaluminum/B209Naval brass 485/B214 O-ringFluorocarbon FKMBuna N5 Poppet316 SS/A479Brass 360/B166 Spring4324556302 SS/A3137 Center body (CA series)316 SS/A4798 Adjusting screw (CA series)9 Locking screw (CA series)PTFE-coated 316 SS/A240316 SS/A479Wetted lubricant7Brass 360/B16Silicone-based (C series);PTFE-based (CA series)Molybdenum—disulfide-based11Wetted components listed in italics.C / CA / CH /CP / CPA SERIESCHECKNonwetted lubricant6316 SS/A27610 Outlet gasket (CA series)11 Outlet bodyBrass 360/B16891012C Seriesshown11CH SeriesComponent1 Inlet body2 PoppetCA SeriesMaterial Grade/ASTM Specification316 SS/A4797Fluorocarbon FKMbonded➀ 316 SS/A4793 Poppet stop316 SS/A2404 Spring302 SS/A3135 O-ringFluorocarbon FKM6 Backup ringPTFE/D17107 Outlet body316 SS/A479Lubricant65PTFE-basedWetted components listed in italics.➀ Material Safety Data Sheet for bonding agentavailable on request.1234
6Check Valves and Relief ValvesMaterials of ConstructionCP Series123465CPA Series21364578Valve Body MaterialsBrass316 SSComponentC / CA / CH /CP / CPA SERIESCHECK1 Insert lock screw2 Insert316 SS/ASTM A276 or A479316 SS/ASTM A4794CP8CPMaterial Grade/SpecificationBrassBrass 360/CW710R/ASTM B16EN 121634CPA8CPABrassCW710R/EN 12163Brass 360/ASTM B163 O-ringFluorocarbon FKMBuna N4 Poppet316 SS/ASTM A479Brass 360/ASTM B165 Spring6 Body7 Adjusting screw (CPA series)8 Locking screw (CPA series)Lubricant302 SS➀/ASTM A313316 SS/ASTM A479Brass 360/ASTM B16316 SS/ASTM A276—Silicone-based andPTFE-based (CP series)PTFE-based (CPA series)Silicone-basedand PTFE-basedWetted components listed in italics.➀ Spring in 316 SS and brass 8CPA series valves is PTFE coated.➁ Adjusting screw in valve with 150 or 350 psi (10.4 or 24.2 bar) spring is 316 SS.316 SS/ASTM A276Brass 360➁/ASTM B16PTFE-based
Check Valves—C, CA, CH, CP, and CPA Series7Flow Data at 70 F (20 C)The flow curves shown here were generated in optimal laboratory conditions. Flow results in individual applications may varydue to specific system parameters.C SeriesNominal Cracking Pressures2C, 6C, 12C, 16C Series1 psi (0.07 bar)10 psi (0.69 bar)25 psi (1.8 bar)4C, 8C Series1 psi (0.07 bar)10 psi (0.69 bar)25 psi (1.8 bar)AirWater2C, 4C Series2C, 4C SeriesAir Flow, std L/minWater Flow, L/min2C Series4C SeriesAir Flow, std ft3/minWater Flow, U.S. gal/min6C, 8C Series6C, 8C SeriesWater Flow, L/minPressure Drop, psiInlet Pressure, bar6C Series8C SeriesAir Flow, std ft3/minC / CA / CH /CP / CPA SERIESCHECK6C Series8C SeriesPressure Drop, barAir Flow, std L/minWater Flow, U.S. gal/min12C, 16C Series12C, 16C SeriesWater Flow, L/minAir Flow, std ft3/minPressure Drop, psiInlet Pressure, barInlet Pressure, psigAir Flow, std L/minPressure Drop, barInlet Pressure, psigPressure Drop, barPressure Drop, psi4C SeriesInlet Pressure, barInlet Pressure, psig2C SeriesWater Flow, U.S. gal/min
8Check Valves and Relief ValvesFlow Data at 70 F (20 C)The flow curves shown here were generated in optimal laboratory conditions. Flow results in individual applications may varydue to specific system parameters.CH SeriesNominal Cracking Pressures1 psi (0.07 bar)10 psi (0.69 bar)AirWaterCH4 SeriesCH4 SeriesPressure Drop, psiPressure Drop, barWater Flow, L/minInlet Pressure, barInlet Pressure, psigAir Flow, std L/minAir Flow, std ft3/minWater Flow, U.S. gal/minCH8 SeriesCH8 SeriesPressure Drop, psiPressure Drop, barWater Flow, L/minInlet Pressure, barInlet Pressure, psigAir Flow, std L/minAir Flow, std ft3/minWater Flow, U.S. gal/minCH16 SeriesCH16 SeriesAir Flow, std ft3/minPressure Drop, barInlet Pressure, barWater Flow, L/minPressure Drop, psiAir Flow, std L/minInlet Pressure, psigC / CA / CH /CP / CPA SERIESCHECK25 psi (1.8 bar)Water Flow, U.S. gal/min
Check Valves—C, CA, CH, CP, and CPA Series9Flow Data at 70 F (20 C)The flow curves shown here were generated in optimal laboratory conditions. Flow results in individual applications may varydue to specific system parameters.CA and CPA SeriesNominal Cracking Pressures3 psi (0.21 bar)50 psi (3.5 bar)150 psi (10.4 bar)Air350 psi (24.2) bar)WaterCA SeriesCA SeriesPressure Drop, psiPressure Drop, barWater Flow, L/minInlet Pressure, barInlet Pressure, psigAir Flow, std L/minAir Flow, std ft3/minWater Flow, U.S. gal/min4CPA Series4CPA SeriesPressure Drop, barPressure Drop, psiInlet Pressure, barWater Flow, L/minAir Flow, std ft3/minWater Flow, U.S. gal/min8CPA Series8CPA SeriesAir Flow, std ft3/minPressure Drop, psiPressure Drop, barWater Flow, L/minInlet Pressure, barInlet Pressure, psigAir Flow, std L/minWater Flow, U.S. gal/minC / CA / CH /CP / CPA SERIESCHECKInlet Pressure, psigAir Flow, std L/min
10Check Valves and Relief ValvesFlow Data at 70 F (20 C)The flow curves shown here were generated in optimal laboratory conditions. Flow results in individual applications may varydue to specific system parameters.CP SeriesNominal Cracking Pressures1 psi (0.07 bar)10 psi (0.69 bar)Air25 psi (1.8 bar)Water4CP Series4CP SeriesPressure Drop, psiPressure Drop, barWater Flow, L/minInlet Pressure, barInlet Pressure, psigAir Flow, std L/minAir Flow, std ft3/minWater Flow, U.S. gal/min8CP Series8CP SeriesWater Flow, L/minAir Flow, std ft3/minPressure Drop, barPressure Drop, psiInlet Pressure, barInlet Pressure, psigC / CA / CH /CP / CPA SERIESCHECKAir Flow, std L/minWater Flow, U.S. gal/minTestingCleaning and PackagingEvery C, CA, CH, CP, and CPA series check valve is factorytested for crack and reseal performance with a liquid leakdetector.Every C, CA, and CH series check valve with VCR or VCO end connections is processed in accordance with SwagelokSpecial Cleaning and Packaging (SC-11) (MS‑06‑63), toensure compliance with product cleanliness requirements asstated in ASTM G93 Level C.Check valves with fixed cracking pressures, C, CP, and CHseries, are cycled six times prior to testing. Every valve istested to ensure it seals within 5 seconds at the appropriatereseal pressure.Check valves with adjustable cracking pressures, CA andCPA series, are tested at two pressure points. Every valveis tested at a low-pressure setting and at a high-pressuresetting. All valves must seal within 5 seconds at theappropriate reseal pressure.All other C, CA, and CH series check valves, as well as everyCP and CPA series check valve, are cleaned in accordancewith Swagelok Standard Cleaning and Packaging (SC-10)(MS‑06‑62).
Check Valves—C, CA, CH, CP, and CPA Series11DimensionsDimensions, shown with Swagelok tube fitting nuts finger-tight, are for reference only and are subject to change.C SeriesCA SeriesEnd ConnectionsInlet/OutletSizeAAB flatB flatC flatC flatBasicOrderingNumberOrdering InformationDimensions, in. (mm)SeriesAB7/16Basic order
CH4 0 .67 1/3, 1, 5, 10 and 25 (0 .03, 0 07, 0 35 0 .69, and 1 .8) 6000 . Material Grade/ASTM Specification 1 Inlet body 316 SS/A479 Brass 360/B16 2Inlet gasket (CA series) Inlet gasket (standard for 6C and 8C series with 50 psi [3.5 bar] spring; optional for 2C and 4C series and all other 6C and 8C series) PTFE-coated Inlet gasket (12C and 16C series) PTFE-coated 316 SS/A240 316 SS/A240 .
