Flanged & Bw Ends Forged Check Valve Class 150LBS - 600LBS

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 150LB - 300LB - 600LB - RF, RTJ, BW Ends

Tengs Valve supplies high-quality Forged Check Valves for ANSI Class 150Lbs, 300Lbs and 600Lbs, manufactured to BS 5352 standards. Available with integral flange, welded flange, RF, RTJ, and BW ends. These bolted bonnet forged steel check valves feature Full Bore (Full Port) design with piston, lifting, and swing type disc. Body materials include carbon steel (A105, LF2), alloy steel (F5, F11, F22), and stainless steel (F304, F316, F51, F53). Ideal for oil & gas, petrochemical, power generation, and industrial pipeline applications requiring reliable backflow protection in small-bore high-pressure service.

Forged Check Valve 150LB - 300LB - 600LB Specifications (RF, RTJ, BW Ends)

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

• Constructions: Bolted Bonnet (B.B.)

• Bore Type: Full Bore / Full Port

• Valve Type: Piston Type, Lifting Type, Swing Type

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

• Pressure Ratings: ANSI 150LBS, 300LBS, 600LBS

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

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

• Trim Materials: 13Cr, Half Stellite, Full Stellite, and other materials to suit service conditions

• Sour Service: NACE MR 0175

• Test and Inspection: API 598

✓ Full Port design provides minimal pressure drop and allows pigging operations in pipeline service

Class 150 vs Class 300 vs Class 600 Forged Check Valve

Parameter	Class 150	Class 300	Class 600
Design Pressure (bar)	19.6	51	102
Design Pressure (psi)	285	740	1,480
Wall Thickness	Standard	Thicker	Heaviest
Typical Application	Low-pressure water, oil, gas, utility lines	General hydrocarbon, steam, process piping	High-pressure process, refinery, power plant

Reference: ASME B16.34. Design pressure values are for reference only and vary with material and temperature.

RF vs RTJ vs BW: End Connection Comparison

End Type	Sealing Method	Pressure Range	Typical Application
RF (Raised Face)	Gasket compression on raised face	Class 150 to 600	General low to medium pressure service
RTJ (Ring Type Joint)	Metal ring gasket in grooved flange	Class 600 and above	High-pressure and high-temperature critical service
BW (Butt Weld)	Permanent welded joint	All pressure classes	Permanent installation, leak-tight high-pressure service

Reference: ASME B16.5, ASME B16.25. RF and RTJ are flanged connections; BW is a welded connection.

Forged Check Valve 150LB - 600LB 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.

Class 150 - 300 - 600LBS Bolted Bonnet Full Port (RF, BW Ends)

Size (NPS)	Dimension	1/2	3/4	1	1 1/4	1 1/2	2
Face to Face (mm)	CL150 L(RF) / L1(BW)	108	118	127	140	165	203
	CL300 L(RF) / L1(BW)	153	178	203	216	229	267
	CL600 L(RF) / L1(BW)	165	191	216	229	241	292
Height (mm)	CL150 H	77	81	93	95	103	118
Height (mm)	CL300/600 H	61	78	84	101	120	133
Flow Port (mm)	d	10	13	17.5	23	30	35
Weight (kgs)	CL150 (RF)	3.6	4.6	8.5	9.2	12.5	14.8
	CL150 (BW)	3.0	3.6	7.6	8.5	11.3	13.6
	CL300 (RF)	3.7	4.8	8.8	9.6	13.7	17.8
	CL300 (BW)	3.2	4.3	8.0	8.6	12.7	16.2
	CL600 (RF)	4.0	5.8	9.5	10.4	15.6	24.5
	CL600 (BW)	3.4	5.1	8.8	9.2	14.8	22.5

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

Forged Check Valve 150LB - 600LB Applications

• Oil and Gas Industry: Wellhead equipment, manifold and flowline backflow protection.

• Power Generation: Steam isolation, boiler drains, turbine bypass lines.

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

• Chemical Processing: Corrosive fluid backflow prevention, reagent feed lines.

• Water Treatment: Pump discharge, desalination, boiler feed water.

• Instrumentation: Instrument root valves, sensing line isolation.

FAQ - Forged Check Valve 150LB - 300LB - 600LB

Q1: What is the difference between Class 150, 300 and 600 forged check valves?

A: Class 150 (19.6 bar / 285 psi) is suitable for low-pressure water, oil, gas, and utility lines. Class 300 (51 bar / 740 psi) is designed for general hydrocarbon, steam, and process piping. Class 600 (102 bar / 1,480 psi) handles high-pressure process, refinery, and power plant service. Higher classes have thicker wall sections, heavier flanges, and higher pressure/temperature ratings.

Q2: When should I use RF, RTJ, or BW ends?

A: RF (Raised Face) is the most common flange facing for Class 150 to 600 general service. RTJ (Ring Type Joint) uses a metal ring gasket and is preferred for Class 600 and above in high-pressure critical service. BW (Butt Weld) provides a permanent welded joint and is suitable for all pressure classes where a leak-tight permanent installation is required.

Q3: What is the difference between integral flange and welded flange?

A: Integral flange is forged as one piece with the valve body, providing higher structural integrity and better suitability for high-pressure small-bore service. Welded flange is forged separately and then welded to the valve body, which is more economical for larger sizes and lower pressure classes. Both flange types can be supplied with RF or RTJ facing per ASME B16.5.

Q4: Why does face-to-face length change with pressure class?

A: Face-to-face (end-to-end) dimensions are governed by ASME B16.10 and increase with higher pressure classes. For example, a 1/2 inch forged check valve has L (RF) of 108 mm in Class 150, 153 mm in Class 300, and 165 mm in Class 600. Higher pressure classes require thicker walls, larger flanges, and longer overall length. This must be considered during piping layout and installation.

Q5: Why is BW end lighter than RF end?

A: BW (Butt Weld) ends do not require flanges, which are the heaviest part of a flanged valve. For example, a 2 inch Class 600 forged check valve weighs 24.5 kg with RF ends but only 22.5 kg with BW ends. BW is also preferred for permanent installations where leak-tightness and weight savings are important. RF is preferred where maintenance and replacement are needed.

Q6: How to select the correct flow port dimension "d"?

A: The flow port dimension "d" represents the internal bore diameter of the valve. For forged check valves 1/2 inch to 2 inch, the standard full-port bore ranges from 10 mm (1/2 inch) to 35 mm (2 inch). Full port provides minimal pressure drop and allows pigging operations. If a reduced port is acceptable, a smaller "d" can be specified for cost savings, but this will increase flow velocity and pressure drop.