Check Valves · Lift Check Valves
Compact Forged Lifting Check Valves
The compact forged lifting check valve is the small-bore, high-pressure execution of the check family: a forged piston-type body built to API 602 (swing disc style available on request), covering NPS 1/2 to 2 (DN15 to DN50) at ASME Class 150 through 4500. Bolted-cover, welded-cover, Y-pattern welded-bonnet and pressure-seal-bonnet constructions, plus a flanged ASME B16.10 execution at Class 150/300/600, are covered by the published dimension tables, with carbon steel, stainless steel, alloy steel, duplex stainless, nickel-base and titanium-alloy bodies and RF, BW, RTJ, SW and NPT end connections.
Part of the Lift Check Valves family
Last updated: 2026-11
Specifications
| size range | Size: NPS 1/2"~2"(DN15~DN50） |
|---|---|
| pressure class | Pressure Rating: ASME CLASS 150~4500（PN16~PN760） |
| body materials | Carbon steel, Stainless steel, Alloy steel, Duplex stainless steel, Nickel base, Titanium alloy steel |
| end connections | RF, BW, RTJ, SW, NPT |
| end to end class800 bolted or welded cover | NPS 3/8: 76 mm | NPS 1/2: 76 mm | NPS 3/4: 86 mm | NPS 1: 102 mm | NPS 1-1/4: 140 mm | NPS 1-1/2: 140 mm | NPS 2: 170 mm (Class 800 bolted cover or welded cover, API 602, regular port size, full port one size smaller) |
| bore diameter class800 bolted or welded cover | NPS 3/8: 6.5 mm | NPS 1/2: 9.5 mm | NPS 3/4: 12.7 mm | NPS 1: 17.5 mm | NPS 1-1/4: 23 mm | NPS 1-1/2: 28.6 mm | NPS 2: 36.5 mm (Class 800 bolted cover or welded cover, API 602, regular port size, full port one size smaller) |
| weight class800 bolted or welded cover | NPS 3/8: 1 kg | NPS 1/2: 1 kg | NPS 3/4: 1.5 kg | NPS 1: 2 kg | NPS 1-1/4: 4.5 kg | NPS 1-1/2: 6 kg | NPS 2: 7.5 kg (Class 800 bolted cover or welded cover, API 602, regular port size, full port one size smaller) |
| end to end class900 1500 bolted or welded cover | NPS 1/2: 90 mm | NPS 3/4: 104 mm | NPS 1: 120 mm | NPS 1-1/4: 150 mm | NPS 1-1/2: 150 mm | NPS 2: 180 mm (Class 900/1500 bolted cover or welded cover, API 602, regular port size, full port one size smaller) |
| bore diameter class900 1500 bolted or welded cover | NPS 1/2: 9 mm | NPS 3/4: 12 mm | NPS 1: 15 mm | NPS 1-1/4: 21 mm | NPS 1-1/2: 27 mm | NPS 2: 32 mm (Class 900/1500 bolted cover or welded cover, API 602, regular port size, full port one size smaller) |
| weight class900 1500 bolted or welded cover | NPS 1/2: 1.5 kg | NPS 3/4: 2.5 kg | NPS 1: 4 kg | NPS 1-1/4: 6 kg | NPS 1-1/2: 8.5 kg | NPS 2: 14.5 kg (Class 900/1500 bolted cover or welded cover, API 602, regular port size, full port one size smaller) |
| end to end class900 1500 pressure seal | NPS 1/2: 120 mm | NPS 3/4: 120 mm | NPS 1: 140 mm | NPS 1-1/4: 165 mm | NPS 1-1/2: 186 mm | NPS 2: 232 mm (Class 900/1500 pressure seal bonnet, API 602, regular port size, full port one size smaller) |
| bore diameter class900 1500 pressure seal | NPS 1/2: 9 mm | NPS 3/4: 12 mm | NPS 1: 15 mm | NPS 1-1/4: 21 mm | NPS 1-1/2: 27 mm | NPS 2: 30 mm (Class 900/1500 pressure seal bonnet, API 602, regular port size, full port one size smaller) |
| weight class900 1500 pressure seal | NPS 1/2: 5 kg | NPS 3/4: 6.5 kg | NPS 1: 8 kg | NPS 1-1/4: 13.5 kg | NPS 1-1/2: 15 kg | NPS 2: 25 kg (Class 900/1500 pressure seal bonnet, API 602, regular port size, full port one size smaller) |
| end to end class2500 pressure seal | NPS 1/2: 120 mm | NPS 3/4: 140 mm | NPS 1: 186 mm | NPS 1-1/2: 232 mm | NPS 2: 279 mm (Class 2500 pressure seal bonnet, ASME B16.34, threaded and socket weld ends, regular port size, full port one size smaller; NPS 1-1/4 column printed as dashes in source) |
| bore diameter class2500 pressure seal | NPS 1/2: 9 mm | NPS 3/4: 12 mm | NPS 1: 15 mm | NPS 1-1/2: 27 mm | NPS 2: 27 mm (Class 2500 pressure seal bonnet, ASME B16.34, threaded and socket weld ends, regular port size, full port one size smaller; NPS 1-1/4 column printed as dashes in source) |
| weight class2500 pressure seal | NPS 1/2: 3.5 kg | NPS 3/4: 5.5 kg | NPS 1: 10.5 kg | NPS 1-1/2: 18.5 kg | NPS 2: 25 kg (Class 2500 pressure seal bonnet, ASME B16.34, threaded and socket weld ends, regular port size, full port one size smaller; NPS 1-1/4 column printed as dashes in source) |
| end to end class800 y pattern welded | NPS 3/8: 80 mm | NPS 1/2: 80 mm | NPS 3/4: 90 mm | NPS 1: 110 mm | NPS 1-1/4: 125 mm | NPS 1-1/2: 155 mm | NPS 2: 180 mm (Class 800 Y-pattern welded bonnet, API 602, full port size; sized by full port size) |
| bore diameter class800 y pattern welded | NPS 3/8: 9.5 mm | NPS 1/2: 12 mm | NPS 3/4: 17 mm | NPS 1: 23 mm | NPS 1-1/4: 28 mm | NPS 1-1/2: 36 mm | NPS 2: 44 mm (Class 800 Y-pattern welded bonnet, API 602, full port size; sized by full port size) |
| weight class800 y pattern welded | NPS 3/8: 1 kg | NPS 1/2: 1.5 kg | NPS 3/4: 2 kg | NPS 1: 4.5 kg | NPS 1-1/4: 8 kg | NPS 1-1/2: 8 kg | NPS 2: 11 kg (Class 800 Y-pattern welded bonnet, API 602, full port size; sized by full port size) |
| end to end class900 1500 y pattern welded | NPS 3/8: 80 mm | NPS 1/2: 90 mm | NPS 3/4: 110 mm | NPS 1: 125 mm | NPS 1-1/4: 155 mm | NPS 1-1/2: 180 mm | NPS 2: 200 mm (Class 900/1500 Y-pattern welded bonnet, API 602, full port size; sized by full port size; center-to-top NPS 2 cell (printed 55.2/6.11, mm inconsistent with inches) skipped per stop condition) |
| bore diameter class900 1500 y pattern welded | NPS 3/8: 9.5 mm | NPS 1/2: 12 mm | NPS 3/4: 15 mm | NPS 1: 21 mm | NPS 1-1/4: 27 mm | NPS 1-1/2: 32 mm | NPS 2: 38 mm (Class 900/1500 Y-pattern welded bonnet, API 602, full port size; sized by full port size; center-to-top NPS 2 cell (printed 55.2/6.11, mm inconsistent with inches) skipped per stop condition) |
| weight class900 1500 y pattern welded | NPS 3/8: 2 kg | NPS 1/2: 3 kg | NPS 3/4: 4.2 kg | NPS 1: 5.2 kg | NPS 1-1/4: 9.5 kg | NPS 1-1/2: 11 kg | NPS 2: 15 kg (Class 900/1500 Y-pattern welded bonnet, API 602, full port size; sized by full port size; center-to-top NPS 2 cell (printed 55.2/6.11, mm inconsistent with inches) skipped per stop condition) |
| end to end class150 flanged | NPS 1/2: 108 mm | NPS 3/4: 117 mm | NPS 1: 127 mm | NPS 1-1/4: 140 mm | NPS 1-1/2: 165 mm | NPS 2: 203 mm (Class 150/300/600 flanged, bolted bonnet, ASME B16.10 structure length, regular port) |
| end to end class300 flanged | NPS 1/2: 152 mm | NPS 3/4: 178 mm | NPS 1: 203 mm | NPS 1-1/2: 229 mm | NPS 2: 267 mm (Class 150/300/600 flanged, bolted bonnet, ASME B16.10 structure length, regular port; NPS 1-1/4 column(s) printed as dashes in source) |
| end to end class600 flanged | NPS 1/2: 165 mm | NPS 3/4: 190 mm | NPS 1: 216 mm | NPS 1-1/2: 241 mm | NPS 2: 292 mm (Class 150/300/600 flanged, bolted bonnet, ASME B16.10 structure length, regular port; NPS 1-1/4 column(s) printed as dashes in source) |
| bore diameter class150 300 600 flanged | NPS 1/2: 9.50 mm | NPS 3/4: 12.7 mm | NPS 1: 17.5 mm | NPS 1-1/4: 23 mm | NPS 1-1/2: 28.6 mm | NPS 2: 36.5 mm (Class 150/300/600 flanged, bolted bonnet, ASME B16.10 structure length, regular port) |
| weight class150 flanged | NPS 1/2: 2.5 kg | NPS 3/4: 3.3 kg | NPS 1: 4.3 kg | NPS 1-1/4: 6.5 kg | NPS 1-1/2: 9 kg | NPS 2: 13 kg (Class 150/300/600 flanged, bolted bonnet, ASME B16.10 structure length, regular port) |
| weight class300 flanged | NPS 1/2: 3.0 kg | NPS 3/4: 3.8 kg | NPS 1: 5.2 kg | NPS 1-1/2: 10.5 kg | NPS 2: 15 kg (Class 150/300/600 flanged, bolted bonnet, ASME B16.10 structure length, regular port; NPS 1-1/4 column(s) printed as dashes in source) |
| weight class600 flanged | NPS 1/2: 3.5 kg | NPS 3/4: 4.5 kg | NPS 1: 6.0 kg | NPS 1-1/2: 12 kg | NPS 2: 17 kg (Class 150/300/600 flanged, bolted bonnet, ASME B16.10 structure length, regular port; NPS 1-1/4 column(s) printed as dashes in source) |
| end to end class800 bolted bonnet | NPS 1/2: 76 mm | NPS 3/4: 86 mm | NPS 1: 102 mm | NPS 1-1/4: 118 mm | NPS 1-1/2: 118 mm | NPS 2: 132 mm (Class 800 bolted bonnet, API 602, threaded and socket weld ends, regular port size, full port one size smaller) |
| bore diameter class800 bolted bonnet | NPS 1/2: 9.5 mm | NPS 3/4: 12.7 mm | NPS 1: 17.5 mm | NPS 1-1/4: 23.8 mm | NPS 1-1/2: 28.6 mm | NPS 2: 36.5 mm (Class 800 bolted bonnet, API 602, threaded and socket weld ends, regular port size, full port one size smaller) |
| weight class800 bolted bonnet | NPS 1/2: 1.5 kg | NPS 3/4: 2.3 kg | NPS 1: 2.8 kg | NPS 1-1/4: 4.0 kg | NPS 1-1/2: 5.7 kg | NPS 2: 7.7 kg (Class 800 bolted bonnet, API 602, threaded and socket weld ends, regular port size, full port one size smaller) |
| end to end class900 1500 bolted bonnet | NPS 1/2: 90 mm | NPS 3/4: 104 mm | NPS 1: 120 mm | NPS 1-1/4: 130 mm | NPS 1-1/2: 130 mm | NPS 2: 150 mm (Class 900/1500 bolted bonnet, API 602, threaded and socket weld ends, regular port size, full port one size smaller) |
| bore diameter class900 1500 bolted bonnet | NPS 1/2: 9.5 mm | NPS 3/4: 12.7 mm | NPS 1: 16 mm | NPS 1-1/4: 27 mm | NPS 1-1/2: 27 mm | NPS 2: 35 mm (Class 900/1500 bolted bonnet, API 602, threaded and socket weld ends, regular port size, full port one size smaller) |
| weight class900 1500 bolted bonnet | NPS 1/2: 1.8 kg | NPS 3/4: 2.5 kg | NPS 1: 3.8 kg | NPS 1-1/4: 6.5 kg | NPS 1-1/2: 6.5 kg | NPS 2: 10 kg (Class 900/1500 bolted bonnet, API 602, threaded and socket weld ends, regular port size, full port one size smaller) |
| end to end class2500 welded | NPS 1/2: 178 mm | NPS 3/4: 178 mm | NPS 1: 186 mm | NPS 1-1/2: 232 mm | NPS 2: 279 mm (Class 2500 welded bonnet, ASME B16.34, threaded and socket weld ends, regular port size, full port one size smaller) |
| bore diameter class2500 welded | NPS 1/2: 9.0 mm | NPS 3/4: 12.0 mm | NPS 1: 15 mm | NPS 1-1/2: 27 mm | NPS 2: 34.5 mm (Class 2500 welded bonnet, ASME B16.34, threaded and socket weld ends, regular port size, full port one size smaller) |
| weight class2500 welded | NPS 1/2: 4.5 kg | NPS 3/4: 7.5 kg | NPS 1: 8.0 kg | NPS 1-1/2: 15 kg | NPS 2: 19.5 kg (Class 2500 welded bonnet, ASME B16.34, threaded and socket weld ends, regular port size, full port one size smaller) |
| center to top open class800 bolted or welded cover bolted | NPS 3/8: 48 mm | NPS 1/2: 48 mm | NPS 3/4: 53 mm | NPS 1: 64 mm | NPS 1-1/4: 80 mm | NPS 1-1/2: 80 mm | NPS 2: 100 mm (center-to-top (open) height, Class 800 bolted cover or welded cover, API 602, regular port size, full port one size smaller, bolted bonnet) |
| center to top open class800 bolted or welded cover welded | NPS 3/8: 49 mm | NPS 1/2: 49 mm | NPS 3/4: 58 mm | NPS 1: 70 mm | NPS 1-1/4: 96 mm | NPS 1-1/2: 90 mm | NPS 2: 125 mm (center-to-top (open) height, Class 800 bolted cover or welded cover, API 602, regular port size, full port one size smaller, welded bonnet) |
| center to top open class900 1500 bolted or welded cover bolted | NPS 1/2: 56 mm | NPS 3/4: 62 mm | NPS 1: 72 mm | NPS 1-1/4: 92.5 mm | NPS 1-1/2: 92.5 mm | NPS 2: 111 mm (center-to-top (open) height, Class 900/1500 bolted cover or welded cover, API 602, regular port size, full port one size smaller, bolted bonnet) |
| center to top open class900 1500 bolted or welded cover welded | NPS 1/2: 61.5 mm | NPS 3/4: 68.5 mm | NPS 1: 72.5 mm | NPS 1-1/4: 83.5 mm | NPS 1-1/2: 83.5 mm | NPS 2: 100.5 mm (center-to-top (open) height, Class 900/1500 bolted cover or welded cover, API 602, regular port size, full port one size smaller, welded bonnet) |
| center to top open class900 1500 pressure seal | NPS 1/2: 188 mm | NPS 3/4: 188 mm | NPS 1: 196 mm | NPS 1-1/4: 220 mm | NPS 1-1/2: 220 mm | NPS 2: 238 mm (center-to-top (open) height, Class 900/1500 pressure seal bonnet, API 602, regular port size, full port one size smaller) |
| end to end class2500 welded cover | NPS 1/2: 120 mm | NPS 3/4: 140 mm | NPS 1: 186 mm | NPS 1-1/2: 232 mm | NPS 2: 279 mm (end-to-end length, Class 2500 welded cover, ASME B16.34, threaded and socket weld ends, regular port size, full port one size smaller; NPS 1-1/4 not offered (printed dash)) |
| bore diameter class2500 welded cover | NPS 1/2: 9 mm | NPS 3/4: 12 mm | NPS 1: 15 mm | NPS 1-1/2: 27 mm | NPS 2: 27 mm (bore diameter, Class 2500 welded cover, ASME B16.34, threaded and socket weld ends, regular port size, full port one size smaller; NPS 1-1/4 not offered (printed dash)) |
| weight class2500 welded cover | NPS 1/2: 3.5 kg | NPS 3/4: 5.5 kg | NPS 1: 10.5 kg | NPS 1-1/2: 18.5 kg | NPS 2: 25 kg (approx. weight, Class 2500 welded cover, ASME B16.34, threaded and socket weld ends, regular port size, full port one size smaller; NPS 1-1/4 not offered (printed dash)) |
| center to top open class2500 welded cover | NPS 1/2: 90 mm | NPS 3/4: 100 mm | NPS 1: 115 mm | NPS 1-1/2: 140 mm | NPS 2: 160 mm (center-to-top (open) height, Class 2500 welded cover, ASME B16.34, threaded and socket weld ends, regular port size, full port one size smaller; NPS 1-1/4 not offered (printed dash)) |
| center to top open class2500 pressure seal | NPS 1/2: 172 mm | NPS 3/4: 195 mm | NPS 1: 214 mm | NPS 1-1/2: 241 mm | NPS 2: 260 mm (center-to-top (open) height, Class 2500 pressure seal bonnet, ASME B16.34, threaded and socket weld ends, regular port size, full port one size smaller; NPS 1-1/4 column printed as dashes in source; NPS 1-1/4 not offered (printed dash)) |
| center to top open class800 y pattern welded | NPS 3/8: 68.5 mm | NPS 1/2: 68.5 mm | NPS 3/4: 78.5 mm | NPS 1: 89.5 mm | NPS 1-1/4: 105.5 mm | NPS 1-1/2: 123.5 mm | NPS 2: 147.5 mm (center-to-top (open) height, Class 800 Y-pattern welded bonnet, API 602, full port size; sized by full port size) |
| center to top open class900 1500 y pattern welded | NPS 3/8: 71.8 mm | NPS 1/2: 82.5 mm | NPS 3/4: 84.2 mm | NPS 1: 104.7 mm | NPS 1-1/4: 121.7 mm | NPS 1-1/2: 143.3 mm (center-to-top (open) height, Class 900/1500 Y-pattern welded bonnet, API 602, full port size; sized by full port size; center-to-top NPS 2 cell (printed 55.2/6.11, mm inconsistent with inches) skipped per stop condition; NPS 2 column excluded, mm/in inconsistent in source (printed 55.2/6.11)) |
| center to top open class150 300 600 flanged | NPS 1/2: 50 mm | NPS 3/4: 54 mm | NPS 1: 68 mm | NPS 1-1/4: 78 mm | NPS 1-1/2: 78 mm | NPS 2: 96 mm (center-to-top (open) height, Class 150/300/600 flanged, bolted bonnet, ASME B16.10 structure length, regular port) |
| end to end class900 1500 flanged | NPS 1/2: 216 mm | NPS 3/4: 229 mm | NPS 1: 254 mm | NPS 1-1/2: 305 mm | NPS 2: 368 mm (end-to-end length, Class 900/1500 overall-end flange, bolted bonnet, ASME B16.10/API 602, regular port) |
| bore diameter class900 1500 flanged | NPS 1/2: 9 mm | NPS 3/4: 12 mm | NPS 1: 15 mm | NPS 1-1/2: 27 mm | NPS 2: 32 mm (bore diameter, Class 900/1500 overall-end flange, bolted bonnet, ASME B16.10/API 602, regular port) |
| weight class900 1500 flanged | NPS 1/2: 6 kg | NPS 3/4: 7.5 kg | NPS 1: 12 kg | NPS 1-1/2: 21 kg | NPS 2: 32.5 kg (approx. weight, Class 900/1500 overall-end flange, bolted bonnet, ASME B16.10/API 602, regular port) |
| center to top open class900 1500 flanged | NPS 1/2: 53 mm | NPS 3/4: 60 mm | NPS 1: 70 mm | NPS 1-1/2: 86 mm | NPS 2: 105 mm (center-to-top (open) height, Class 900/1500 overall-end flange, bolted bonnet, ASME B16.10/API 602, regular port) |
| center to top open class800 bolted bonnet | NPS 1/2: 48.5 mm | NPS 3/4: 52 mm | NPS 1: 67 mm | NPS 1-1/4: 88 mm | NPS 1-1/2: 88 mm | NPS 2: 101 mm (center-to-top (open) height, Class 800 bolted bonnet, API 602, threaded and socket weld ends, regular port size, full port one size smaller) |
| center to top open class900 1500 bolted bonnet | NPS 1/2: 57.5 mm | NPS 3/4: 66 mm | NPS 1: 78.5 mm | NPS 1-1/4: 106 mm | NPS 1-1/2: 106 mm | NPS 2: 129 mm (center-to-top (open) height, Class 900/1500 bolted bonnet, API 602, threaded and socket weld ends, regular port size, full port one size smaller) |
| center to top open class2500 welded | NPS 1/2: 81 mm | NPS 3/4: 81 mm | NPS 1: 94 mm | NPS 1-1/2: 158 mm | NPS 2: 180 mm (center-to-top (open) height, Class 2500 welded bonnet, ASME B16.34, threaded and socket weld ends, regular port size, full port one size smaller) |
Application & selection guidance
Select this execution where compact high-pressure lines need non-return protection with a short, positive piston stroke: match the construction to pressure (bolted or welded cover for general service, Y-pattern where horizontal run layout suits it, pressure seal bonnet toward the top of the Class 150-4500 envelope, flanged ends where the piping standard calls for ASME B16.10 face-to-face dimensions), the forging to line temperature and medium, and the end connection to the plant piping standard — socket-weld and threaded ends for compact instrument-grade pipework, RF/RTJ flanges or butt-weld ends for permanent installation.
Frequently asked questions
What standard governs compact forged lifting check valves?
The benchmark execution is designed to API 602, the compact forged-body valve standard, in piston-type construction as the standard disc style; a swing disc style is available upon request. Published constructions span bolted and welded covers, Y-pattern welded bonnet and pressure seal bonnet through Class 2500, plus flanged Class 150/300/600 bodies.
Which sizes and pressure classes does this execution cover?
NPS 1/2 to 2 (DN15 to DN50) at ASME Class 150 through 4500 (PN16 to PN760). The dimension tables are published by regular port size with full port one size smaller for the threaded and socket-weld constructions, and by full port size for the Y-pattern executions.
How do I choose between the bonnet constructions?
Bolted-cover and welded-cover bodies serve general service at Class 800 through Class 1500 ratings; the Y-pattern welded execution gives a shorter center-to-top height for tight horizontal runs; pressure seal bonnet construction serves the highest classes (Class 900/1500 through Class 2500); and the flanged execution at Class 150/300/600 suits plants that need flange-end removal instead of welded-in compact bodies. Confirm material and end connection against line temperature and medium at quotation.
Ordering & documentation
Documents
Ask for the documentation set you need with the inquiry — typical items for this execution (material certificates, test reports to the listed inspection standard, dimensional drawings) are confirmed and supplied with the quotation.
Quotation
A quotation-ready inquiry states: nominal size and pressure rating, body and seat material preference, end connection, operation, and the service medium with temperature. Typical values on this page are benchmark reference ranges; the binding values are confirmed at quotation.
Sample & supply
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Storage & shipping
Store valves with seats and seals protected from UV, ozone and deformation, keep end-face protectors on until installation, and for elastomer- or PTFE-seated executions avoid prolonged outdoor storage — seat compounds age fastest in direct sunlight and freezing conditions.
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