Forged Steel Flanged Gate 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 Flanged Gate Valve - API602, Class 150 to 2500, 1/2 inch to 2 inch

China Industrial Forged Steel Flanged Gate Valve Supplier, Exporter, Manufacturer. This page focuses on Flanged (RF, RTJ) forged steel gate valves per API 602, covering Class 150Lb to 2500Lb. Solid wedge, rising stem, OS&Y, bolted bonnet and welded bonnet designs. Flanged connection eliminates welding at site, allowing quick installation and removal in pipeline systems, ideal for high-pressure small-bore applications requiring frequent maintenance.

Various body materials are available: A105(N), LF2, F5, F11, F22, F304, F316, F51, F53 or equivalent. Various trim options are available to suit different service conditions.

End Connections: Flanged RF and RTJ per ANSI B16.5. Other ends also available: Threaded (NPT), Butt Weld (BW), Socket Weld (SW).

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

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

Forged Steel Flanged Gate Valve Specification

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

• Constructions: OS&Y, Bolted Bonnet (B.B.), Welded Bonnet (W.B.) and Pressure Sealed Bonnet (PSB)

• Bore Type: Full Port

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

• Pressure Class: Class 150 to Class 2500

• End Connections: Flanged (RF, RTJ) per ANSI B16.5

• Body Materials: A105(N), LF2, F5, F11, F22, F304, F316, F51, F53 or Equivalent

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

• Sour Service: NACE MR 0175 on Request

• Inspection and Test: API 598

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

• Special Requirement: Please contact us

✓ Flanged connection eliminates welding at site, allows quick installation and removal for high-pressure small-bore pipeline systems

Forged Steel Flanged Gate Valve Main Parts and Trim Options

Part Name	Trim 1# (A105)	Trim 8# (A105)	Trim 5# (A105)	Trim SS304 (F304)	Trim SS316 (F316)
Body	A105	A105	A105	F304	F316
Bonnet	A105	A105	A105	F304	F316
Disc	13Cr	13Cr	STL	F304	F316
Seat	13Cr	STL	STL	SS304	SS316
Stem	F6a	F6a	F6a	F304	F316
Bolts/Nuts	B7/2H	B7/2H	B7/2H	B8/8	B8M/8M

Reference: API 602, BS 5352, ASME B16.34. Trim options: 1# (13Cr/13Cr), 8# (13Cr/STL), 5# (STL/STL), SS304 (F304/SS304), SS316 (F316/SS316). Contact us for confirmed material certificate.

Pressure Class Comparison

Pressure Class	Design Pressure (bar)	Design Pressure (psi)	Recommended Facing
Class 150	19.6	285	RF
Class 300	51	740	RF
Class 600	102	1,480	RF or RTJ
Class 900	153	2,220	RTJ
Class 1500	260	3,750	RTJ
Class 2500	430	6,250	RTJ

Reference: ASME B16.34. Design pressure values are for reference only and vary with material and temperature. Facing recommendation is a general guide; final selection depends on project specification.

Forged Steel Flanged Gate Valve Applications

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

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

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

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

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

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

FAQ - Forged Steel Flanged Gate Valve

Q1: What is the difference between flanged and SW/NPT forged gate valves?

A: Flanged ends allow easy installation and removal without welding, making them ideal for pipeline systems requiring frequent maintenance or replacement. SW (Socket Weld) and NPT (Threaded) ends are more compact and are typically used for permanent small-bore high-pressure installations. Flanged valves are available in RF and RTJ facing per ANSI B16.5.

Q2: What is the difference between RF and RTJ flange facing?

A: RF (Raised Face) is the most common flange facing, suitable for low to medium pressure services up to Class 600. RTJ (Ring Type Joint) is a metal-to-metal seal design used for high-pressure and high-temperature services, typically Class 900 and above. RTJ provides superior sealing performance under extreme conditions.

Q3: What is the difference between API 602 and API 600 gate valves?

A: API 602 covers forged steel gate valves in sizes 1/2 inch to 2 inch, designed for high-pressure small-bore applications. API 600 covers cast steel gate valves in larger sizes. Forged construction provides higher strength and tighter grain structure, making API 602 valves ideal for compact, high-pressure installations.

Q4: What trim options are available for flanged forged gate valves?

A: Standard trim options include Trim 1# (13Cr disc, 13Cr seat), Trim 8# (13Cr disc, STL seat), Trim 5# (STL disc, STL seat), Trim SS304 (F304 disc, SS304 seat) and Trim SS316 (F316 disc, SS316 seat). Trim selection depends on operating temperature, pressure and fluid corrosiveness.

Q5: What is the difference between integral flange and welded flange?

A: Integral flange is forged together with the valve body, providing higher strength and better leak-tightness for high-pressure applications. Welded flange is welded onto the valve body, offering more flexibility in flange facing and material combinations. Both are available for choice.

Q6: Is NACE MR 0175 available for sour service?

A: Yes, NACE MR 0175 compliance is available on request for sour service applications. This includes material selection, hardness control and testing requirements to ensure resistance to sulfide stress cracking. Please specify NACE MR 0175 in your inquiry.