Forged Gate Valve 800LBS (Npt & Sw Ends)

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 FORGED GATE VALVE

 FORGED GLOBE VALVE

 FORGED CHECK VALVE

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 Y TYPE STRAINER

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Forged Gate Valve 800LBS (SW and NPT Ends) - API602, 1/2 inch to 2 inch

China Industrial Forged Gate Valve 800LBS Supplier, Exporter, Manufacturer. This page covers Class 800 forged gate valves with Socket Weld (SW) and Threaded (NPT) ends, manufactured per API 602. Class 800 is a forged valve-specific pressure rating defined in API 602, not part of the standard ASME B16.34 cast valve class series. Solid wedge, rising stem OS&Y, bolted bonnet or welded bonnet. Sizes 1/2 inch to 2 inch (DN15 to DN50). Full bore (FB) and reduced bore (RB) available. Body materials include carbon steel (A105, A105N, LF2), alloy steel (F5, F11, F22), stainless steel (F304, F316), duplex steel (F51, F53). NACE MR 0175 available. Ideal for instrument lines, hydraulic systems, steam tracing and small-bore high-pressure piping.

Specifications for Forged Gate Valve 800LBS (SW, NPT Ends)

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

• Pressure Rating: ANSI Class 800Lb (800#) - forged valve-specific rating per API 602

• Constructions: OS&Y, Bolted Bonnet (B.B.), Welded Bonnet (W.B.)

• Bore Type: Full Port (FB) / Reduced Port (RB)

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

• Socket Weld Ends: Per ANSI B16.11, permanent leak-tight connection for high-pressure small-bore piping

• Threaded Ends: NPT per ANSI B1.20.1, easy installation and removal without welding

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

• Trim Materials: 13Cr, STL, SS304, SS316, F6a, Hard Faced, Full Hard Faced

• Sour Service: NACE MR 0175 on Request

• Inspection and Test: API 598

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

✓ Class 800 is approximately between Class 600 and Class 900, specifically defined for forged steel small-bore valves in API 602

Class 800 Forged Gate Valve Material Comparison

Body Material	Grade	Temp. Range	Best For
Carbon Steel	A105, A105N, LF2	-29°C to 425°C	Steam, water, oil, gas and instrument lines
Alloy Steel	F5, F11, F22	Up to 593°C	High-temperature steam, power plant, refinery
Stainless Steel	F304, F304L, F316, F316L	-196°C to 425°C	Corrosive media, chemical, offshore
Duplex Stainless Steel	F51, F53	-50°C to 300°C	High-chloride, seawater, sour service

Reference: API 602, ASME B16.34. Temperature range varies with pressure class and trim material. Contact us for confirmed material certificate.

Class 800 vs Adjacent Pressure Classes

Pressure Class	Design Pressure (bar)	Design Pressure (psi)	End Connection
Class 600	102	1,480	SW, NPT, BW, Flanged
Class 800	138	2,000	SW, NPT (this page)
Class 900	153	2,220	SW, NPT, BW, Flanged

Reference: API 602 and ASME B16.34. Class 800 is a forged valve-specific rating, approximately between Class 600 and Class 900.

Forged Gate Valve 800LBS (SW and NPT Ends) Dimensions

NPS (inch)	DN (mm)	L (mm)
1/2″	15	79
3/4″	20	92
1″	25	111
1-1/4″	32	120
1-1/2″	40	120
2″	50	140

Reference: API 602 / ASME B16.10. Dimensions may vary by manufacturer. Contact us for confirmed drawing.

Forged Gate Valve 800LBS Applications

• Instrumentation: Instrument root valves, sensing line isolation, steam trap isolation on small-bore high-pressure lines.

• Hydraulic Systems: High-pressure hydraulic power units, test stands, oil and gas hydraulic control panels.

• Steam Tracing: Steam tracing and condensate isolation in refinery and petrochemical plants.

• Oil and Gas: Wellhead control panels, chemical injection lines, sampling systems.

• Power Generation: Boiler drain, air vent, and sampling line isolation on small-bore high-pressure piping.

• Chemical Processing: Reagent feed lines, catalyst injection, corrosive fluid isolation.

FAQ - Forged Gate Valve 800LBS (SW and NPT Ends)

Q1: Why is Class 800 called a forged valve-specific rating?

A: Class 800 is defined in API 602 specifically for forged steel small-bore valves. It is not part of the standard ASME B16.34 cast valve class series. Its design pressure of 138 bar (2,000 psi) places it approximately between Class 600 and Class 900, providing higher pressure capability than Class 600 while staying compact.

Q2: When should I choose SW over NPT ends for Class 800 forged gate valves?

A: Choose Socket Weld (SW) for permanent, leak-tight high-pressure installations where welding is possible and no future disassembly is expected. Choose NPT (Threaded) for applications requiring easy installation and removal, or where welding is not practical. NPT is limited to lower pressure and temperature than SW in the same class.

Q3: What is the difference between full port and reduced port in Class 800?

A: Full port (FB) has a bore equal to the nominal pipe size, minimizing pressure drop and allowing pigging. Reduced port (RB) has a smaller bore, resulting in a more compact and lighter valve at lower cost, with slightly higher pressure drop. Both are available for Class 800 forged gate valves.

Q4: What is the maximum temperature for Class 800 forged gate valves?

A: The standard temperature range is -29°C to 425°C (-20°F to 800°F) for carbon steel and stainless steel bodies. With alloy steel (F5, F11, F22) and appropriate trim, higher temperatures up to 593°C can be achieved. Contact us for specific temperature and pressure derating curves.

Q5: What is the difference between bolted bonnet and welded bonnet in Class 800?

A: Bolted bonnet (B.B.) allows easy access for maintenance and trim replacement, suitable for general service. Welded bonnet (W.B.) provides a more compact, leak-tight design preferred for high-pressure and critical service. Both feature OS&Y (Outside Screw and Yoke) construction.

Q6: Is NACE MR 0175 available for Class 800 SW/NPT gate valves?

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