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Socket Welded Forged Steel Check Valve

Introduction

Check valve, also called non return valve, reflux valve, one-way valve or counterbalance valve, opens and closes automatically relying on media flowing pressure. Main parts of socket weld forged steel check valve include valve body, disc, bonnet and gasket. It is used to prevent reverse flow and leakage of medium, such as fluid, gas, etc. This type of forged steel valve is also applied to stop reversal of pump and driving motor.

Applications

Socket weld forged steel check valve can be widely applied as fluid regulating and intercepting equipment in tap water, sewage, construction, petroleum, chemical, food, medicine, textile, electric power, shipbuilding, metallurgy, and other pipeline systems.

Advantages and Features

1. It needs small twisting force to close the socket weld forged steel check valve.
2. Sealing material can be selected according to medium so as to enhance the non return valve’s sealing property and wear resistance.
3. Precision casting and CNC processing technology is adopted for making valve body.
4. Disc restrainer is designed to prevent that the open position of disc is too high to be shut down.
5. High strength solid pin is installed precisely, which assures excellent performance and long serving life of socket weld forged steel check valve. 6. Friction between sealing surfaces is small.
7. Rocker is with high strength and flexibility for disc closing.
8. Disc of threaded forged steel check valve is with high strength and stiffness.
9. The disc sealing surface can be customized. Customer can choose sealing materials like deposited metal material or inset non-metallic material according to requirement.
10. Two times shot blasting processing of valve surface make this non return valve look fine and smooth.

Classification of Socket Weld Forged Steel Check Valve

1) We have swing type and lift type check valve.
2) According to medium pressure rating, check valves can be classified into CLASS900 PN16.0 and CLASS1500 PN26.0.
3) Check valves with bolted bonnet or welded bonnet are available for selection.
4) Treaded end or SW end forged steel check valve are provided.

Working Principle

Socket weld forged steel check valve allows medium to flow through it in only one direction, and it prevents reverse direction flow. Disc of check valve will open under the pressure of forward flow fluid. When fluid flows in reverse direction, the disc will be closed by fluid pressure and dead weight so as to cut off the flow.

Pressure: CLASS900-1500 PN16.0~26.0

1. Bolted Bonnet/Welded Bonnet
2. Full Port
3. Swing or Lift Type
4. Treaded Ends or SW Ends

Technical Specification of Non Return Valve


Technical Specification ASME/API/BS GB/JB
Design Standard BS5352 GB/T7746
Pressure-Temperature Rating ASME B16.34 GB/T12224
Face-Face Factory Standard GB/T7746
Socket-Welded Ends ASME B16.11 GB/T1751
Threaded Ends ASME B1.20.1 GB/T306
Inspection & Test API598 JB/T9092

Material List for Main Parts of Socket Weld Forged Steel Check Valve


No. Part Name ASTM
Carbon Steel Tailess Steel Alloy Steel
1 Body A105 LF2/LF3 A182 F304 A182 F11/F22
2 Seat A182F6a A182F6a A182 F304 A182 F11/F22
3 Disc/Ball A182F6a A182F6a A182 F304 A182F6a
4 Pin A276-410 A276-410 A276-410 A276-410
5 Spring Si.Mn Alloy Steel Stainless Steel Cr.V Alloy Steel
6 Gasket Graphite+304
7 Bonnet A105 LF2/LF3 A182 F304 A182 F11/F22
8 Bolt A193 B7 A320L7 A193 B8 A193 B16

Main Dimensions & Weight


Pressure Size Main Dimension of Non Return Valve Weight (kg)
mm in. L L H
Reduce Bore Full Bore Reduce Bore Full Bore Reduce Bore Full Bore
CLASS900 PN16.0 Swing Type 15 10 1/2 3/8 10 10 79 61 1.2
20 15 3/4 1/2 13 13 92 61 1.4
25 20 1 3/4 18 18 111 78 2.3
32 25 1-1/4 1 24 24 120 84 3.9
40 32 1-1/2 1-1/4 29 29 152 103 5.6
50 40 2 1-1/2 36.5 36.5 172 118 8.9
CLASS1500PN26.0 Lift Type 15 10 1/2 3/8 10 10 79 61 1.0
20 15 3/4 1/2 13 13 92 61 1.1
25 20 1 3/4 18 18 111 78 1.9
32 25 1-1/4 1 24 24 120 84 3.4
40 32 1-1/2 1-1/4 29 29 120 101 4.5
50 40 2 1-1/2 36.5 36.5 140 120 7.3

Maintenance

1. All our socket weld forged steel check valves are guaranteed for 18 months.
2. Lifelong technology consultancy service is available for our products.