Flanged & Bw Ends Forged Check Valve Class900LBS - 1500LBS - 2500LBS

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 Class 900LBS - 1500LBS - 2500LBS - Flanged, BW Ends

Tengs Valve supplies high-quality Forged Check Valves for ANSI Class 900LBS, 1500LBS and 2500LBS, manufactured to BS 5352 standards. Available with flanged (RF, RTJ) or butt weld (BW) ends, bolted bonnet (BB) and RJ gasket design. Body materials include carbon steel and stainless steel with metal seat, hard seal, and trim options in Trim 1#, 5#, 8#, 12#. Both integral flange and welded flange types are available. Ideal for high-pressure oil & gas, petrochemical, and power generation applications requiring reliable backflow protection in small-bore high-pressure service.

Flanged / BW Ends Forged Steel Check Valve Class 900LBS - 1500LBS - 2500LBS Specifications

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

• Constructions: Bolted Bonnet (B.B.), RJ Gasket Design

• Bore Type: Full Bore / Full Port

• Valve Type: Vertical (Lifting) Type, Swing Type

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

• Pressure Ratings: ANSI 900LBS, 1500LBS, 2500LBS

• End Connections: Flanged (RF, RTJ), Butt Weld (BW)

• Flange Type: Integral Flange or Welded Flange

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

• Trim Materials: Trim 1#, 5#, 8#, 12# and other materials to suit service conditions

• Seat Type: Metal Seat, Hard Seal

• Sour Service: NACE MR 0175

• Test and Inspection: API 598

✓ High-pressure service — RJ gasket design and RTJ facing available for Class 900 and above critical applications

Class 900 vs Class 1500 vs Class 2500 Forged Check Valve

Parameter	Class 900	Class 1500	Class 2500
Design Pressure (bar)	153	260	430
Design Pressure (psi)	2,220	3,750	6,250
Face to Face (1/2″)	216 mm	216 mm	264 mm
Flange Facing	RF, RTJ	RF, RTJ	RF, RTJ
Typical Application	High-pressure steam, gas transmission	Wellhead, gas injection, high-pressure process	HP steam generators, gas compressor lines

Reference: ASME B16.34. Class 2500 provides the highest pressure containment and is limited to smaller sizes due to extreme wall thickness.

Vertical (Lifting) Type vs Swing Type Forged Check Valve

Type	Disc Movement	Installation	Flow Port (d)
Vertical (Lifting)	Piston lifts vertically along flow axis	Horizontal or vertical upward flow	Smaller bore (tighter sealing)
Swing Type	Disc swings on hinge pin	Horizontal (recommended)	Larger bore (lower pressure drop)

Reference: BS 5352. Vertical type is preferred for high-pressure small-bore service; Swing type is preferred for larger sizes and lower pressure drop. Class 2500 is only available in Vertical type due to extreme pressure.

Forged Check Valve Class 900 - 2500 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	RTJ Ring	RTJ Ring	RTJ Ring	RTJ Ring	RTJ Ring	RTJ Ring	RTJ Ring	RTJ Ring	RTJ Ring	RTJ Ring	RTJ Ring

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

Class 900 - 1500LBS RJ Gasket Bolted Bonnet Full Port

Item	Sub-item	1/2	3/4	1	1 1/4	1 1/2	2
Face to Face (mm)	L(RF) L1(BW)	216	229	254	280	305	371
Height (mm)	H	81	93	95	101	118	130
Flow Port (mm)	d (vertical)	12	15	20	28	32	40
Flow Port (mm)	d (swing)	13.5	18	24	29	36.5	45
Weight (kgs)	Vertical	5.2	6.8	10.5	28	18	24
Weight (kgs)	Swing	5.0	6.1	10.8	29	17.6	27

Reference: BS 5352, ASME B16.10. Dimensions may vary by manufacturer. Contact us for confirmed drawing and quotation.

Class 2500LBS RJ Gasket Bolted Bonnet Full Port

Item	Sub-item	1/2	3/4	1	1 1/4	1 1/2	2
Face to Face (mm)	L(RF) L1(BW)	264	273	308	349	384	450
Face to Face (mm)	L(RTJ)	264	273	308	352	387	454
Height (mm)	H	81	93	95	101	118	130
Flow Port (mm)	d (vertical)	12	15	20	28	32	40
Flow Port (mm)	d (swing)	10.5	13.5	18	24	29	36.5
Weight (kgs)	Vertical	17	21	28	44.5	58	85
Weight (kgs)	Swing	—	—	—	—	—	—

Reference: BS 5352, ASME B16.10. Class 2500 is only available in Vertical type due to extreme pressure rating. Contact us for confirmed drawing and quotation.

Forged Check Valve Class 900 - 2500 Applications

• Oil and Gas Industry: High-pressure wellhead equipment, Christmas trees, manifold and flowline backflow protection.

• Power Generation: Main steam isolation, boiler drains, turbine bypass lines at Class 900 to 2500.

• Petrochemical: Hydrocracking, hydrotreating, catalytic cracking, reformer units.

• Chemical Processing: High-pressure corrosive fluid backflow prevention, reagent feed lines.

• Gas Injection and Compression: Natural gas compressor lines, gas injection wells.

• Instrumentation: High-pressure instrument root valves, sensing line isolation.

FAQ - Forged Check Valve Class 900 - 1500 - 2500LBS

Q1: What is the difference between Class 900, 1500 and 2500 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 2500 (430 bar / 6,250 psi) handles HP steam generators and gas compressor lines. Higher classes have thicker wall sections, heavier flanges, and longer face-to-face dimensions.

Q2: Why does Class 2500 have a separate L(RTJ) dimension?

A: Class 2500 forged check valves are typically supplied with RTJ (Ring Type Joint) flanges due to the extreme pressure rating. The RTJ gasket sits in a machined groove, which requires a slightly longer face-to-face dimension compared to RF (Raised Face). For example, a 2 inch Class 2500 valve has L(RF) = 450 mm but L(RTJ) = 454 mm. This 4 mm difference must be considered during piping layout.

Q3: How do I choose between Vertical (Lifting) and Swing type?

A: Vertical (Lifting) type uses a piston that moves along the flow axis, providing faster closing and tighter sealing — preferred for high-pressure small-bore service. Swing type uses a hinged disc that swings on a hinge pin, providing lower pressure drop — suitable for larger sizes. For Class 2500, only Vertical type is available due to the extreme pressure rating. For Class 900-1500, both types are available, and the weight difference is typically 2-10% (e.g., 1/2 inch Class 900: Vertical 5.2 kg vs Swing 5.0 kg).

Q4: Why is Swing type not available for Class 2500?

A: Class 2500 operates at approximately 430 bar (6,250 psi), which requires maximum wall thickness and structural integrity. The swing type design, with its hinged disc and hinge pin, is not structurally suitable for this pressure class. Vertical (Lifting) type is the standard design for Class 2500, providing better sealing reliability at extreme pressure.

Q5: When should I use RTJ instead of RF for Class 900-2500?

A: RTJ (Ring Type Joint) uses a metal ring gasket in a machined groove, providing superior sealing integrity under high pressure and temperature. RF (Raised Face) uses a flat gasket and is suitable for lower pressure service. For Class 900 and above, RTJ is the recommended choice for critical service such as wellhead equipment, high-pressure steam, and gas injection. RF can still be used for less critical applications.

Q6: How does face-to-face length change with pressure class?

A: Face-to-face dimensions increase with higher pressure classes due to thicker walls and larger flanges. For example, a 1/2 inch forged check valve has L(RF) of 216 mm in Class 900/1500, and 264 mm in Class 2500. A 2 inch valve has 371 mm in Class 900/1500, and 450 mm (RF) or 454 mm (RTJ) in Class 2500. Always verify the dimension against the actual pressure class during piping design.