Casted & Forged Check Valves
Automatic non-return backflow prevention valves conforming to BS 1868 (Casted Swing Check) and API 602 / BS 5352 (Forged Lift & Swing Check). Engineered with internal hinge pins, renewable Stellite hard-faced seats, anti-slam spring assists, and pressure ratings from Class 150 up to Class 2500.
Instant Closure Non-Return Protection for High-Pressure Process Lines & Pumps
ENGIPRO SOLUTIONS LLP manufactures precision Casted Check Valves (BS 1868 / API 6D) and Forged Steel Check Valves (API 602 / BS 5352 / ISO 15761) designed for rapid, automatic reverse-flow shut-off. Engineered to protect rotating equipment, centrifugal pumps, and compressors against hydraulic shock and pressure surges, our check valves provide minimal forward pressure drop combined with dependable sealing.
Our Casted Swing Check Valves (available from 2" to 36") feature a full-port unobstructed waterway with an internal hinge pin that eliminates body penetrations and potential external fugitive emissions. Forged Check Valves (available from 1/2" to 2" in Class 800/1500/2500) are offered in both Swing Check and guided Lift / Piston Check configurations, forged from high-density ASTM A105, A350 LF2, F11/F22, and stainless steels.
Fitted with renewable Stellite hard-faced seats and precision-lapped discs, every valve is thoroughly tested in accordance with API 598. Suitable for horizontal or vertical upward piping in oil and gas refineries, petrochemical complexes, boiler feedwater circuits, and offshore facilities.
Special Features & Engineering Construction
Engineered in strict accordance with BS 1868, API 602, and ASME B16.34 for robust anti-backflow service.
Internal Hinge Pin Design
Hinge pin is mounted internally without through-body drill holes, eliminating external bonnet plugs and eliminating potential leak paths.
Swing & Lift Configurations
Swing check provides low pressure drop for continuous flow lines, while lift/piston check provides chatter-free performance in pulsating pump service.
Renewable Stellite Trim
Precision lapped disc and seat rings hard-faced with Cobalt-base Stellite Gr. 6 (API Trim 5 / 8 / 12) for erosion and chattering resistance.
Pressure Seal Covers
Offered with bolted covers for moderate pressures and pressure-seal covers for severe service at Class 900 to Class 2500.
Anti-Slam Spring Return
Optional Inconel X-750 assist springs ensure rapid, cushioned closure before reverse flow accelerates, preventing hydraulic water hammer.
Multiple End Connections
Available in Flanged Raised Face (RF), Ring Type Joint (RTJ), Butt Weld (BW), Socket Weld (SW), and Screwed (NPT/BSPT) connections.
Full Waterway Porting
Full-area disc opening provides maximum Cv flow capacity with negligible head loss, optimizing pumping system energy efficiency.
NACE MR0175 Compliance
Manufactured with controlled metallurgical hardness and corrosion-resistant alloys for sour gas and hydrocarbon pipeline deployment.
Technical Specifications
Comparative design parameters and engineering standards for Casted (BS 1868) and Forged (API 602) Check Valves.
Operational Standards & Engineering Details
| Design Standards |
Casted Check Valves: BS 1868, API 6D, ASME B16.34 Forged Check Valves: API 602, BS 5352, ISO 15761, ASME B16.34 |
| Special Construction Features | Swing Check Type • Lift / Piston Check Type • Internal Hinge Pin Construction (No external leak path) • Renewable Stellite Hardfaced Seat Rings • Bolted Cover • Welded Cover • Pressure Seal Cover for High Pressure Class 900 to 2500 • Anti-slam Spring Return Option |
| End Flanges & Connections |
Flanged Raised Face (RF) • Ring Type Joint (RTJ) as per ASME B16.5 & B16.47 Screwed End (NPT / BSPT) • Socket Weld End (ASME B16.11) • Butt Weld End (ASME B16.25) |
| Face to Face Dimensions | ASME B16.10, BS EN 558, ISO 5752 |
| Testing Standards | API 598, BS EN 12266-1, ISO 5208 (100% Hydrostatic & Low-Pressure Backseat) |
| Size Range |
Casted Check: 2" to 36" (DN 50 to DN 900) Forged Check: 1/2" to 2" (DN 15 to DN 50) |
| Pressure Rating |
Casted Check: Class 150#, 300#, 600#, 900#, 1500#, 2500# Forged Check: Class 800#, 1500#, 2500# |
| Piping Orientation | Horizontal lines or vertical pipelines with upward flow direction |
| Shutoff Rating | Tight Metal-to-Metal Sealing complying strictly with API 598. |
Material Specification & Service Metallurgy
| CONSTRUCTION TYPE | BODY / COVER MATERIALS | TRIM / DISC & SEAT SURFACING |
|---|---|---|
| Forged Carbon Steel | ASTM A105, A350 LF2 (Low Temp -46°C) | 13% Cr (Trim 1), Stellite 6 (Trim 5), 13% Cr + Stellite (Trim 8) |
| Forged Alloy Steel | ASTM A182 F11, F22, F91 (High Temp Steam) | Full Stellite Hardfaced (Trim 5 / Trim 16) |
| Forged Stainless Steel | ASTM A182 F304, F304L, F316, F316L, F321, F347 | 304 / 316 Stainless Steel, Stellite Trim 12 |
| Forged Duplex / Exotic | F51 (Duplex 2205), F53 (Super Duplex 2507), Inconel 625, Monel 400, Hastelloy C-276, Alloy 20 | Matching Exotic Alloys / Stellite Facing |
| Casted Carbon Steel | ASTM A216 WCB, WCC, ASTM A352 LCB, LCC | API Trim 8 (13Cr / HF), API Trim 5 (Full Stellite 6) |
| Casted Stainless & Alloy | ASTM A351 CF8, CF8M, CF3, CF3M, WC6, WC9 | SS 316 + Stellite (API Trim 10 / 12) |
Engineered for Reliable Reverse Flow Protection
Check valves safeguard rotating equipment, pumps, and compressors across high-pressure industrial fluid systems.
Pump Discharge Headers
Centrifugal pump discharge protection preventing reverse pump spin and protecting against destructive hydraulic pressure transients upon sudden shutdown.
Compressor Discharge Systems
Gas compressor outlets utilizing spring-assisted lift/piston check valves to eliminate disc flutter and rapid wear during high-frequency pulsation.
Boiler Feedwater Non-Return
High-pressure economizer inlets and boiler feedwater lines preventing backflow of high-temperature steam into feedwater pumps during plant trips.
Chemical Process Reactor Feeds
Reactant feed lines, catalytic dosing systems, and toxic chemical headers preventing cross-contamination and hazardous back-migration.
Offshore Seawater Injection
High-pressure reservoir water injection, firewater deluge skids, and ballast water overboard lines manufactured in Super Duplex 2507.
Refinery Fractionation Headers
Naphtha hydrotreaters, vacuum residue lines, and coker furnace pass headers where thermal cycling and heavy cracking require Stellite seats.
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Need Custom Check Valves or Anti-Slam Spring Assists?
Our technical engineers assist with cracking pressure selection, dynamic response calculations, anti-slam dampeners, and NACE compliance certification.