Forged Carbon 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 Carbon Steel Check Valve - API 602, BS 5352, 1/2 inch to 2 inch

Tengs Valve is a professional Forged Carbon Steel Check Valve supplier, offering swing type, vertical (lifting) type, ball type and Y pattern forged steel check valves. Sizes from 1/2″ to 2″ (DN15 to DN50), pressure ratings from ANSI Class 150Lbs to 2500Lbs. The forged carbon steel check valve can be designed with the following bonnet types: Bolted Bonnet (BB), Welded Bonnet (WB) and Pressure Seal Bonnet (PSB). Body materials include A105, LF2, F5, F11, F22 or equivalent. Ideal for oil & gas, petrochemical, power generation, and instrumentation applications.

Forged Carbon Steel Check Valve Specifications

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

• Constructions: Bolted Bonnet (BB), Welded Bonnet (WB) & Pressure Sealed Bonnet (PSB)

• Port Type: Full Port / Reduced Port

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

• Pressure Ratings: ANSI 150LB, 300LB, 600LB, 800LB, 900LB, 1500LB & 2500LB

• End Connections: Threaded (Screwed), NPT, Flanged, Butt Weld, Socket Weld (SW)

• Body Materials: A105, LF2, F5, F11, F22 or Equivalent

• Trim Materials: Various trim materials are available to suit different service conditions

• Sour Service: NACE MR 0175

• Test and Inspection: API 598

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

Forged Carbon Steel Check Valve Material List

Part Name	Material
	A105			LF2	F11	F22
	Trim 1#	Trim 8#	Trim 5#	Trim 13Cr	Trim 13Cr	Trim 13Cr
Body	A105	A105	A105	LF2	F11	F22
Bonnet	A105	A105	A105	LF2	F11	F22
Disc	13Cr	13Cr	STL	13Cr	13Cr	13Cr
Seat	13Cr	STL	STL	13Cr	13Cr	13Cr
Hinge Pin	F6a	F6a	F6a	F6a	F6a	F6a
Bolts	B7	B7	B7	L7	B16	B16

Reference: API 602, BS 5352, ASTM A105, A350, A182. Materials may vary by model and pressure rating. Contact us for confirmed material certificate.

A105 vs LF2 vs F11 vs F22: Forged Carbon Steel Grade Comparison

Grade	Standard	Material Type	Temperature Range	Typical Application
A105 / A105N	ASTM A105	Carbon Steel	-29°C to 425°C	General hydrocarbon, steam, water, oil and gas
LF2	ASTM A350 LF2	Low Temperature Carbon Steel	-46°C to 345°C	LNG, cold climate, low-temperature service
F11	ASTM A182 F11	Alloy Steel (1.25Cr-0.5Mo)	-29°C to 593°C	High-temperature steam, power plants, refinery
F22	ASTM A182 F22	Alloy Steel (2.25Cr-1Mo)	-29°C to 650°C	High-temperature steam, hydrocracking, hydrogen service

Reference: ASTM A105, A350, A182. A105 and LF2 are carbon steels; F11 and F22 are chrome-moly alloy steels for elevated temperature service.

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 Carbon 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 Carbon Steel Check Valve

Q1: What is a forged carbon steel check valve?

A: A forged carbon steel check valve is a non-return valve with the body and bonnet made of forged carbon steel (A105, A105N, or LF2). Unlike cast valves, forged construction provides a tighter grain structure, higher strength, and better impact toughness, making it ideal for small-bore high-pressure applications up to Class 2500. It is manufactured to API 602 / BS 5352 and is available in swing, lift, ball, and Y pattern types.

Q2: What is the difference between A105 and LF2?

A: A105 is standard forged carbon steel suitable for service from -29°C to 425°C. LF2 (ASTM A350 LF2) is a low-temperature forged carbon steel grade with guaranteed impact toughness down to -46°C. LF2 is preferred for LNG, cold climate pipelines, and cryogenic applications where A105 would become brittle.

Q3: What is the difference between F11 and F22?

A: F11 (1.25Cr-0.5Mo) and F22 (2.25Cr-1Mo) are chrome-moly alloy steels for elevated temperature service. F11 is suitable for service up to 593°C, while F22 provides higher creep strength and hydrogen resistance for service up to 650°C. F22 is commonly used in hydrocracking and hydrogen service, while F11 is preferred for high-temperature steam lines.

Q4: 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.

Q5: What is the difference between BB, WB and PSB bonnet designs?

A: Bolted bonnet (BB) allows easy access for maintenance and trim replacement. Welded bonnet (WB) 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.

Q6: What is the difference between Full Port and Reduced Port check valves?

A: Full Port (FB) check valves have an internal bore equal to the pipe inner diameter, providing minimal pressure drop and allowing pigging operations — preferred for pipeline and process lines requiring full flow. Reduced Port (RB) check valves have a smaller internal bore, resulting in higher flow velocity, better sealing performance, and lower cost — commonly used in small-bore high-pressure service where flow capacity is not critical.