Lift Check Valve Open Die Forged for Cryogenic Ball Valve
Description
TECHNICAL DATA SHEET
LIFT CHECK VALVE FOR CRYOGENIC SERVICE
PN420 · Butt‑Weld Ends · Spring‑Loaded Disc · Extended Bonnet
Typical Size Range: DN15 – DN50 (½″ – 2″) – Larger sizes on request
Temperature Range: –196 °C to +120 °C
End Connections: Butt‑Weld (BW) per ASME B16.25 / EN 12627
1. GENERAL DESCRIPTION
This is a spring‑loaded, vertical‑lift check valve specifically engineered for cryogenic service. The valve is manufactured from forged austenitic stainless steel and features an extended bonnet to isolate the body‑bonnet gasket and closure thread from the extreme cold, preventing ice formation. The disc is spring‑assisted, which ensures rapid, chatter‑free closure and allows installation in horizontal (preferred) or vertical upward flow lines. The valve is intended for non‑return duty in liquid nitrogen, liquid oxygen, liquid argon, LNG, and other clean cryogenic media.
The standard seat configuration is metal‑seated (Stellite® overlay) for long service life. A soft‑seated option with a KEL‑F® (PCTFE) insert is available for zero‑leakage, bubble‑tight shut‑off.
2. APPLICABLE STANDARDS
| Parameter | Standard |
|---|---|
| Design & Manufacture | API 602 (Compact Steel Gate Valves – extended for check valves), BS 6364, ISO 28921‑1 |
| Face‑to‑Face Dimensions | API 602 Table 5 (Class 2500) or ASME B16.10 |
| Butt‑Weld End Dimensions | ASME B16.25 Schedule XXS / Pipe Schedule as specified |
| Pressure‑Temperature Ratings | ASME B16.34 – Standard Class 2500 (equivalent to PN420) |
| Testing & Inspection | API 598, BS 6364 (cryogenic type test) |
| Cleanliness for Oxygen Service | CGA G‑4.1 / ASTM G93 (option) |
| Marking | EN 19 / MSS SP‑25 |
3. TECHNICAL SPECIFICATIONS
| Parameter | Value / Description |
|---|---|
| Valve Type | Spring‑loaded lift check valve, extended bonnet, bolted bonnet, outside screw plug‑type closure |
| Nominal Size Range | DN15 to DN50 (½″ to 2″) |
| Nominal Pressure | PN420 – ASME Class 2500 equivalent |
| Bore Type | Full bore (reduced bore optional) |
| End Connection | Butt‑weld ends (BW) conforming to ASME B16.25, standard schedule XXS or as specified |
| Body Material | Forged ASTM A182 F316/F316L (dual certified), fully austenitic |
| Bonnet – Extension | Forged or cold‑rolled ASTM A276 Type 316L |
| Bonnet – Upper | Forged ASTM A182 F316L |
| Disc | Forged ASTM A182 F316, seating face hardfaced with Stellite® Gr.6 (standard metal seated) |
| Seat Ring | Integral Stellite® Gr.6 overlay (or replaceable seat insert – KEL‑F®/PCTFE for soft seat) |
| Spring | Stainless steel 316 (inconel X‑750 or 316 on request) |
| Bonnet Gasket | Spiral wound SS316L + Graphite / PTFE |
| Bolting (Bonnet) | ASTM A193 Gr. B8M Class 2 / ASTM A194 Gr. 8M – PTFE coated |
| Leakage Class (Metal Seat) | Rate B per API 598 |
| Leakage Class (Soft Seat) | Rate A – Zero leakage (bubble‑tight) per API 598 |
| Flow Direction | Flow upward under the disc – horizontal mounting standard (vertical up‑flow acceptable) |
4. MATERIALS OF CONSTRUCTION
| Part No. | Component | Material Standard & Grade |
|---|---|---|
| 1 | Body | Open die forged ASTM A182 F316/F316L (1.4401/1.4404) |
| 2 | Bonnet (Extension) | ASTM A276 Type 316L – cold worked |
| 3 | Bonnet (Upper) | ASTM A182 F316L |
| 4 | Disc | ASTM A182 F316, seat overlay Stellite® Grade 6 |
| 5 | Seat (Integral) | Body seat machined with Stellite® Gr.6 overlay or KEL‑F® insert |
| 6 | Spring | ASTM A313/A276 316 Stainless Steel |
| 7 | Bonnet Gasket | Spiral wound SS316L inner ring + PTFE filler, captured in groove |
| 8 | Bonnet Bolting | ASTM A193 B8M Class 2 + ASTM A194 8M, PTFE coated |
| 9 | Lifting Plug / Cap | ASTM A182 F316L (for maintenance access to disc/spring) |
| 10 | Identification Plate | Stainless Steel 316, riveted |
All pressure‑containing forgings are subject to Charpy V‑notch impact testing at –196 °C with minimum 40 J average (ISO 28921‑1). Full traceability to EN 10204 3.1 is standard.
5. PRESSURE – TEMPERATURE RATING (ASTM A182 F316/F316L Body, ASME Class 2500)
| Temperature (°C) | Max. Working Pressure (bar) |
|---|---|
| –196 to 38 | 425.0 |
| 50 | 417.0 |
| 100 | 396.0 |
| 120 | 386.0 |
Ratings are non‑shock and in accordance with ASME B16.34, material group 2.2. For intermediate temperatures, linear interpolation is permissible. The extended bonnet maintains packing area at ambient temperature; it does not affect the pressure‑temperature boundary.
6. DIMENSIONS & WEIGHTS (Butt‑Weld Ends, API 602 Class 2500 Short Pattern)
| Nominal Size DN | NPS | Bore Ø (mm) | Face‑to‑Face L (mm) | Height H (open) (mm) | Wt. Approx. (kg) |
|---|---|---|---|---|---|
| 15 | ½″ | 14 | 140 | 245 | 6.2 |
| 20 | ¾″ | 18 | 152 | 265 | 7.8 |
| 25 | 1″ | 24 | 178 | 295 | 10.5 |
| 40 | 1½″ | 36 | 216 | 350 | 18.0 |
| 50 | 2″ | 46 | 254 | 420 | 28.5 |
Dimensions are typical for butt‑weld Schedule XXS pipe bore. For different pipe schedules (e.g., Sch 80, 160) the bore diameter and weld preparation will be adjusted. Certified outline drawings are available on request. Larger sizes up to DN100 are possible with reinforced body design.
7. TESTING & INSPECTION
| Test Type | Test Medium | Test Pressure / Criteria | Remarks |
|---|---|---|---|
| Shell Strength | Water | 1.5 × MAWP = 638 bar (gauge) | No visible leakage or deformation |
| Seat Closure – High Pressure | Water | 1.1 × MAWP = 468 bar (gauge) | Metal seat: API 598 Rate B max. allowable leakage; Soft seat: zero leakage |
| Seat Closure – Low Pressure | Nitrogen | 6 ± 0.5 bar | Bubble‑tight test for soft‑seated versions only |
| Cryogenic Type Test (optional) | Liquid Nitrogen | Seat & shell test at –196 °C, per BS 6364 / ISO 28921‑1 | Leakage rate and opening pressure recorded |
| Material Positive Identification | PMI (XRF) | 100 % of pressure‑containing parts | Verified against 3.1 material certificate |
| Impact Testing (Charpy V‑notch) | – | –196 °C on body, bonnet forgings | ≥40 J average (transverse) |
| Oxygen Service Cleaning (option) | Visual / UV | Degreased, nitrogen purged, bagged per CGA G‑4.1 | No hydrocarbons, oil‑free |
Standard valves are supplied with ambient‑temperature shell and seat tests, together with EN 10204 3.1 material certificates. Full cryogenic test (witnessed) and additional NDE are available as optional extras.
8. AVAILABLE OPTIONS & ACCESSORIES
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Seat Design:
-
Soft‑seated – KEL‑F® (PCTFE) insert for bubble‑tight zero leakage.
-
Metal‑seated – Stellite® Gr.6 overlay on disc and integral seat, ideal for dirty or high‑cycle service.
-
-
Spring Material: Inconel X‑750 for enhanced fatigue life and corrosion resistance.
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End Connections: NPT threaded, socket‑weld (SW), or flanged (ASME B16.5 RF/RTJ) – confirm pressure‑temperature compatibility.
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Bore Type: Full bore standard; reduced bore available for lower flow applications.
-
Drain / Vent: Bonnet plug with vent/drain port for safe depressurization (recommended for oxygen service).
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Mounting Bracket: Top platform for position sensor or limit switch (indicates disc fully open/closed).
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Oxygen Cleaned & Bagged: Per CGA G‑4.1, ASTM G93, validated by UV light inspection.
-
Certifications: PED 2014/68/EU Module H, SIL capability statement, ATEX‑compliant accessories, CRN (Canada).
9. ORDERING INFORMATION
When inquiring or placing an order, please specify:
-
Valve type: Cryogenic Lift Check Valve
-
Nominal size: DN _____ (NPS _____)
-
Pressure class: PN420 (Class 2500)
-
Body material: ASTM A182 F316/F316L
-
Seat type: Metal (Stellite®) / Soft (KEL‑F®)
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End connection: Butt‑weld (BW) – provide pipe schedule or actual pipe ID / wall thickness
-
Service medium & minimum design temperature
-
Any optional requirements: cryogenic test, O₂ cleaning, spring material, etc.
This technical data sheet is intended for preliminary selection. For critical cryogenic applications the manufacturer must be consulted to provide a fully engineered solution, detailed interface drawings, and cryogenic performance verification.
