Forged Check Valve 900LBS - 1500LBS (NPT & SW Ends)

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

LATEST PRODUCTS

Forged Check Valve 900LBS - 1500LBS - SW, NPT Ends - API 602, BS 5352

Tengs Valve supplies high-quality Forged Check Valves for ANSI Class 900LBS and 1500LBS, manufactured to BS 5352 standards. Available with Socket Weld (SW) and Threaded (NPT) ends, in Bolted Bonnet (BB) or Welded Bonnet (WB) designs. Sizes from NPS 1/2″ to NPS 2″ with Full Bore or Reduced Bore options. Valve types include Ball, Piston, and Swing Type. Body materials include forged carbon steel (A105, LF2), alloy steel (F5, F11, F22), stainless steel (F304, F316), and duplex steel (F51, F53). Ideal for high-pressure oil & gas, petrochemical, power generation, and instrumentation applications requiring reliable backflow protection in small-bore high-pressure service.

Specifications For Forged Check Valve 900#, 1500# (SW, NPT Ends)

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

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

• Bore Type: Full Bore / Reduced Bore

• Valve Type: Ball, Piston, Swing Type

• Size Range: 1/2″, 3/4″, 1″, 1-1/4″, 1-1/2″, 2″ (NPS 1/2 to NPS 2)

• Pressure Ratings: ANSI 900LBS, 1500LBS

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

• Body Materials: A105, 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

• Test and Inspection: API 598

✓ High-pressure small-bore service — SW and NPT ends provide compact, leak-tight connection for instrument and sampling lines

Bolted Bonnet (BB) vs Welded Bonnet (WB) vs Pressure Seal Bonnet (PSB)

Parameter	BB	WB	PSB
Sealing Principle	Bolts + gasket	Seal welded to body	Internal pressure self-energizing
Leak Tightness	Good	Excellent	Best at high pressure
Maintenance	Easy trim replacement	Not repairable	Depressurize for access
Weight	Larger	Compact	Heaviest
Recommended Class	150–900	600–1500	900–2500
Typical Application	General service	Permanent installation	HP steam, wellhead

Reference: BS 5352, API 602. For Class 900 and 1500 with SW/NPT ends, BB and WB are the standard designs; PSB is typically used with flanged ends.

Socket Weld (SW) vs Threaded (NPT) Ends

Parameter	Socket Weld (SW)	Threaded (NPT)
Connection Type	Welded (socket)	Threaded (screwed)
Standard	ANSI B16.11	ANSI B1.20.1
Leak Tightness	Excellent (welded joint)	Good (sealant required)
Pressure Limit	Full Class 900/1500	Reduced at high temperature
Installation	Requires welding on site	Quick installation without welding
Typical Application	Permanent high-pressure service	Instrument lines, sampling, temporary connections

Reference: ANSI B16.11, ANSI B1.20.1. SW is preferred for Class 900/1500 permanent installations; NPT is preferred for instrument and sampling lines where quick assembly is needed.

Ball vs Piston vs Swing Type Forged Check Valve

Type	Disc Movement	Installation	Typical Application
Ball Type	Ball moves along seat	Horizontal or vertical	Viscous fluids, varying flow rates
Piston Type	Piston moves along flow axis	Horizontal or vertical upward flow	High-pressure small-bore service
Swing Type	Disc swings on hinge pin	Horizontal (recommended)	Lower pressure drop, larger sizes

Reference: BS 5352, API 602. Piston type is most common for NPS 1/2 to NPS 2 Class 900/1500 service; Ball type is used for viscous fluids; Swing type is used for lower pressure drop applications.

Forged Check Valve 900LBS - 1500LBS Material List

Part Name	Carbon Steel				Alloy Steel			Stainless Steel
	A105	A105	A105	LF2	F5	F11	F22	F304	F316	F51	F53
	Trim 1#	Trim 8#	Trim 5#	Trim 13Cr	Trim 13Cr	Trim 13Cr	Trim 13Cr	—	—	—	—
Body	A105	A105	A105	LF2	F5	F11	F22	F304	F316	F51	F53
Bonnet	A105	A105	A105	LF2	F5	F11	F22	F304	F316	F51	F53
Disc	13Cr	13Cr	STL	13Cr	13Cr	13Cr	13Cr	F304	F316	F51	F53
Seat	13Cr	STL	STL	13Cr	13Cr	13Cr	13Cr	SS304	SS316	STL	STL
Hinge Pin	F6a	F6a	F6a	F6a	F6a	F6a	F6a	F304	F316	F51	F53
Bolts / Nuts	B7 / 2H	B7 / 2H	B7 / 2H	L7 / 4	B16 / 4	B16 / 4	B16 / 4	B8 / 8	B8M / 8M	B8M / 8M	B8M / 8M
Gasket	Graphite	Graphite	Graphite	Graphite	Graphite	Graphite	Graphite	Graphite	Graphite	Graphite	Graphite

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

Forged Steel Check Valve Bolted Bonnet and Welded Bonnet Dimensions

Reference: BS 5352, ASME B16.11, ANSI B1.20.1. Dimensions may vary by manufacturer. Contact us for confirmed drawing and quotation.

Forged Check Valve 900LBS - 1500LBS Applications

• Oil and Gas Industry: High-pressure instrument root valves, manifold and flowline backflow protection, sampling systems.

• Power Generation: High-pressure steam trap isolation, sensing line isolation, auxiliary high-pressure systems.

• Petrochemical: Hydrocarbon processing, catalytic cracking, reagent feed lines at Class 900/1500.

• Chemical Processing: High-pressure corrosive fluid backflow prevention, dosing systems.

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

• Instrumentation: Small-bore high-pressure instrument lines requiring compact SW/NPT connection.

FAQ - Forged Check Valve 900LBS - 1500LBS (SW, NPT Ends)

Q1: What is the difference between Class 900 and Class 1500 forged check valves?

A: Class 900 (153 bar / 2,220 psi) is suitable for high-pressure steam and gas transmission. Class 1500 (260 bar / 3,750 psi) is designed for wellhead, gas injection, and high-pressure process service. Class 1500 has thicker wall sections, heavier body, and higher pressure/temperature ratings. For example, face-to-face dimensions are typically similar for both classes in NPS 1/2 to NPS 2 sizes, but the wall thickness and weight differ significantly. Class 1500 is preferred for critical high-pressure service.

Q2: When should I use SW instead of NPT for Class 900/1500?

A: SW (Socket Weld) ends are welded to the pipe, providing excellent leak tightness and full Class 900/1500 pressure capability. SW is preferred for permanent high-pressure installations, especially where the pipe is not easily accessible for maintenance. NPT (Threaded) ends are screwed onto the pipe, allowing quick assembly and disassembly without welding — preferred for instrument lines, sampling systems, and temporary connections. For Class 900/1500, NPT may have a reduced pressure rating at high temperature, so SW is generally preferred for critical high-pressure service.

Q3: What is the difference between Ball, Piston, and Swing types?

A: Ball type uses a ball that moves along the seat, suitable for viscous fluids and varying flow rates. Piston type uses a piston that moves along the flow axis, providing fast closing and tight sealing — the most common type for NPS 1/2 to NPS 2 Class 900/1500 service. Swing type uses a hinged disc that swings on a hinge pin, providing lower pressure drop — used for slightly larger sizes and lower pressure drop applications. For high-pressure small-bore service, Piston type is generally recommended.

Q4: What is the difference between BB, WB, and PSB bonnet designs?

A: Bolted Bonnet (BB) uses bolts and a gasket, allowing easy trim replacement on site — suitable for Class 150 to 900 service. Welded Bonnet (WB) has the bonnet seal-welded to the body, providing better leak tightness and a more compact design for Class 600 to 1500 service, but the valve cannot be repaired. Pressure Seal Bonnet (PSB) uses internal line pressure to self-energize the seal — recommended for Class 900 to 2500 critical service. For Class 900/1500 with SW/NPT ends, BB and WB are the standard designs; PSB is typically used with flanged ends.

Q5: Why are SW and NPT ends preferred for NPS 1/2 to NPS 2 forged valves?

A: Small-bore forged valves (NPS 1/2 to NPS 2) are typically used in instrument lines, sampling systems, and compact high-pressure installations where space is limited. Flanged ends would add weight and require more space. SW and NPT ends provide a compact, low-profile connection that is ideal for these applications. SW is preferred for permanent installations; NPT is preferred where quick assembly and disassembly are needed. Both are more economical than flanged ends for small-bore service.

Q6: How does face-to-face length differ between Class 900 and Class 1500?

A: For SW/NPT ends in NPS 1/2 to NPS 2 sizes, face-to-face dimensions are typically governed by BS 5352 and are similar for Class 900 and Class 1500. However, the body wall thickness and weight increase significantly from Class 900 to Class 1500. For example, a 1/2 inch Class 900 check valve may weigh around 5 kg, while the Class 1500 equivalent may weigh around 8 kg due to thicker walls and heavier bonnet. Always verify the dimensions and weight against the actual pressure class during piping design.