Forged Steel Check Valve

CAST VALVE SERIES

 GATE VALVE

 GLOBE VALVE

 CHECK VALVE

 BALL VALVE

 BUTTERFLY VALVE

FORGED VALVE SERIES

 FORGED GATE VALVE

 FORGED GLOBE VALVE

 FORGED CHECK VALVE

INDUSTRIAL STRAINER SERIES

 Y TYPE STRAINER

 BASKET STRAINER

 T TYPE STRAINER

 TEMPORARY STRAINER

 FORGED STRAINER

 STRAINER SCREEN & BASKET

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Forged Steel Check Valve - API 602, BS 5352, Class 150 to 2500

China Industrial Forged Steel Check Valve Supplier, Exporter, Manufacturer. API 602 forged steel check valves available in swing type, lifting type, vertical type, ball type and Y pattern. Different bore types: Full Bore (FB), Reduced Bore (RB), Standard Bore. Different bonnet designs: Bolted Bonnet (B.B.), Welded Bonnet (W.B.) and Pressure Seal Bonnet (PSB). Forged construction provides higher strength and tighter grain structure than cast valves, ideal for high-pressure small-bore applications up to Class 2500.

Various body materials are available: A105(N), LF2, F5, F11, F22, F91, F304(L), F316(L), F51, F53 or equivalent.

End Connections: SW, NPT, BW and Flanged, Nipple Ends.

Sizes: 1/2″, 3/4″, 1″, 1-1/4″, 1-1/2″, 2″ (DN15 to DN50).

Pressure Ratings: ANSI Class 150Lb, 300Lb, 600Lb, 800Lb, 900Lb, 1500Lb, 2500Lb.

Forged Steel Check Valve Application Specification

• Design and Manufacture: API 602, BS 5352, ASME B16.34

• End Connections: Socket-Weld: ANSI B16.11, Screwed (Threaded): ANSI B1.20.1, Butt-Welding: ANSI B16.25, Flange Ends: ANSI B16.5

• Inspection and Test: API 598

• Structure Feature: Bolted Bonnet (B.B.), Welded Bonnet (W.B.), Pressure Seal Bonnet (PSB)

• Bore Type: Full Bore (FB), Reduced Bore (RB), Standard Bore

• Valve Type: Swing Type, Lifting Type, Vertical Type, Ball Type, Y Pattern

• Size Range: 1/2 inch to 2 inch (DN15 to DN50)

• Pressure Class: Class 150 to Class 2500

• Temperature Range: -29°C to 425°C (-20°F to 800°F)

✓ Forged construction provides higher strength and tighter grain structure than cast valves for high-pressure small-bore service

API 602 vs BS 5352: Forged Steel Check Valve Standard Comparison

Parameter	API 602 (US)	BS 5352 (EU)
Scope	Forged steel gate, globe, and check valves, sizes 1/2″ to 2″	Steel wedge gate, globe and check valves 50 mm and smaller
Pressure Class	Class 800, 1500, 2500	Class 800, 1500, 2500
End Connections	SW, NPT, BW, Flanged	SW, NPT, BW, Flanged
Testing	API 598	BS 5146 / API 598
Typical Application	US projects, oil & gas, petrochemical	European projects, oil & gas, petrochemical

Reference: API 602, BS 5352. API 602 is the American standard, BS 5352 is the British/European standard for small forged steel valves. Both cover similar scope and pressure ratings.

Forged Steel Check Valve Types: Swing vs Lift vs Ball vs Y Pattern

Type	Disc Movement	Installation	Typical Application
Swing Type	Hinged disc swings on pin	Horizontal or vertical upward flow	General service, low pressure drop
Lift / Piston Type	Piston lifts vertically along flow axis	Horizontal only	High-pressure systems, tight sealing
Ball Type	Ball moves along seat	Horizontal or vertical	Viscous fluids, varying flow rates
Y Pattern	Angled body with lift disc	Horizontal or vertical	Reduced pressure drop, high flow capacity

Reference: API 602, BS 5352. Type selection depends on installation orientation, pressure class, and flow characteristics.

Pressure Class Comparison

Pressure Class	Design Pressure (bar)	Design Pressure (psi)	Typical Service
Class 800	138	2,000	General hydrocarbon, steam, water, instrument lines
Class 1500	260	3,750	High-pressure steam, gas injection, wellhead equipment
Class 2500	430	6,250	High-pressure steam generators, natural gas compressor lines

Reference: ASME B16.34. Class 800 is a forged valve-specific rating (approximately between Class 600 and 900).

Forged Steel Check Valve Materials List

Reference: API 602, BS 5352, ASME B16.34. Materials may vary by model and pressure rating. Contact us for confirmed material certificate.

Forged Steel Check Valve Applications

• Oil and Gas Industry: Wellhead equipment, Christmas trees, manifold and flowline backflow protection.

• Power Generation: High-pressure steam isolation, boiler drains, turbine bypass lines.

• Petrochemical: Hydrocarbon processing, catalytic cracking, reformer units.

• Chemical Processing: Corrosive fluid backflow prevention, reagent feed lines, sampling systems.

• Water Treatment: High-pressure pump discharge, desalination, boiler feed water.

• Instrumentation: Instrument root valves, steam trap isolation, sensing line isolation.

FAQ - Forged Steel Check Valve

Q1: What is the difference between API 602 and BS 5352 forged steel check valves?

A: API 602 is the American standard for forged steel gate, globe, and check valves in sizes 1/2″ to 2″. BS 5352 is the British/European standard for steel wedge gate, globe, and check valves 50 mm and smaller. Both cover similar scope, pressure ratings (Class 800 to 2500), and end connections (SW, NPT, BW, Flanged). API 602 is commonly specified in American projects, while BS 5352 is preferred in European and Middle East projects.

Q2: What is the difference between swing type and lift type check valves?

A: A swing check valve uses a hinged disc that swings on a hinge pin, providing full bore flow with minimal pressure drop — suitable for larger sizes and horizontal pipelines. A lift check valve (also called piston check valve) uses a piston or disc that moves along the flow axis, providing faster closing and better sealing at the seat — suitable for smaller sizes and vertical pipelines. Lift check valves generally provide tighter shut-off but higher pressure drop than swing check valves.

Q3: What is the difference between bolted bonnet and welded bonnet design?

A: Bolted bonnet (B.B.) allows easy access for maintenance and trim replacement. Welded bonnet (W.B.) provides a more compact design and is preferred for high-pressure Class 1500 and 2500 applications where leak-tightness is critical. Pressure Seal Bonnet (PSB) uses internal line pressure to tighten the seal, becoming more effective as pressure increases, suitable for Class 900 and above.

Q4: What end connections are available for forged steel check valves?

A: We offer Socket-Weld (SW) per ANSI B16.11, Screwed/Threaded (NPT) per ANSI B1.20.1, Butt-Welding (BW) per ANSI B16.25, and Flanged ends per ANSI B16.5. The choice depends on piping specification, pressure class and installation requirements.

Q5: What materials are available for forged steel check valves?

A: Standard body materials include carbon steel (A105, A105N, LF2), alloy steel (F5, F11, F22, F91), stainless steel (F304, F304L, F316, F316L) and duplex stainless steel (F51, F53). Material selection depends on operating temperature, pressure and fluid corrosiveness. NACE MR 0175 compliance is available on request for sour service.

Q6: What is Class 800 and why is it specific to forged valves?

A: Class 800 is a pressure rating specific to forged steel valves (API 602 / BS 5352), positioned between Class 600 and Class 900 with a design pressure of approximately 138 bar (2,000 psi). It is not part of the standard ASME B16.34 Class 150–2500 sequence for cast valves. Class 800 is widely used in small-bore forged valves for general hydrocarbon, steam, water, and instrument line service.