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Butt Welded Forged Steel Check Valve

Introduction

Check valve, also known as non return valve, reflux valve, one-way valve or counterbalance valve, opens and closes automatically depending on media flowing pressure. Butt weld forged steel check valve is mainly composed of include valve body, disc, bonnet and gasket. We have swing check valve and lift check valve.

Application

This type of forged steel valve is used to prevent reverse flow and leakage of medium, such as fluid, gas, etc. It is also applied to stop reversal of pump and driving motor. Butt 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

1. Sealing material can be selected according to medium so as to enhance reflux valve’s sealing property and wear resistance.
2. It needs small twisting force to close butt weld forged steel check valve.
3. Friction between sealing surfaces is small.
4. The disc sealing surface can be customized. Customer can choose sealing materials like deposited metal material or inset non-metallic material according to requirement.
5. All our check valves are guaranteed for 18 months. Lifelong technology consultancy service is available for our products.

Features of Butt Weld Forged Steel Check Valve

1. Precision casting and CNC processing technology is adopted for making valve body.
2. Disc restrainer is designed to prevent that the open position of disc is too high to be shut down.
3. High strength solid pin is installed precisely, which assures excellent performance and long serving life.
4. Rocker is with high strength and flexibility for disc closing.
5. Disc of butt weld forged steel check valve is with high strength and stiffness.
6. Sealing performance of the forged steel valve is good.
7. Two times shot blasting processing of valve surface make this forged steel valve look fine and smooth.
8. Full port is one of this reflux valve’s main features.

Classification of Butt Weld Forged Steel Check Valve

1. According to Pressure: CLASS150/300/600
2. According to Bonnet: Bolted Bonnet or Welded Bonnet
3. Swing Type or Lift Type
4. According to End: Flange End or Butt Weld End

Pressure: CLASS150~600

1. Bolted Bonnet/Welded Bonnet
2. Full Port
3. Swing or Lift Type
4. Flange Ends or Butt-Welding Ends

Technical Specification


Design Standard ASME B16.34/BS5352
Pressure-Temperature Rating ASME B16.34
Face-Face ASME B16.10
Flange Ends ASME B16.5
Buttwelding Ends ASME B16.25
Inspection & Test API598

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


Pressure Size Main Dimension of Valve Reflux Valve
mm in. d LRF LBW H Weight(kg)
Lift type Swing type
CLASS150 15 1/2 13 105 105 61 61 3.4
20 3/4 18 117 117 78 78 4.4
25 1 24 127 127 84 84 8.2
32 1-1/4 29 140 140 103 101 8.9
40 1-1/2 36.5 165 165 118 120 12.0
50 2 46.5 203 203 130 133 14.3
CLASS300 15 1/2 13 152 152 61 61 3.7
20 3/4 18 178 178 78 78 4.8
25 1 24 203 203 84 84 8.8
32 1-1/4 29 216 216 103 101 9.6
40 1-1/2 36.5 229 229 118 120 13.7
50 2 46.5 267 267 130 133 17.8
CLASS600 15 1/2 13 165 165 61 61 4.0
20 3/4 18 190 190 78 78 5.8
25 1 24 216 216 84 84 9.5
32 1-1/4 29 229 229 103 101 10.4
40 1-1/2 36.5 241 241 118 120 15.6
50 2 46.5 292 292 130 133 24.5
Note: H means the height when reflux valve is fully opened.

Malfunction, Reason and Solution


Malfunction Disc Breakage Medium Backflow
Reason The disc beat the valve seat frequently. Some disc valves which are made of brittle materials (such as cast iron, brass, etc.) will be easily broken. 1. Sealing surface is damaged. 2. Impurities are sandwiched between sealing surfaces.
Solution Applying ductile materials to manufacturer valve disc Repairing the sealing surface or cleaning impurities

Working Principle

Butt weld forged steel check valve allows medium to flow through it in only one direction, and it prevents reverse direction flow. Disc of reflux 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.

Payment, Package and Transportation

1. Butt weld forged steel check valves can be paid by T/T, D/P, D/A, L/C, and so on.
2. Standard exporting wooden cases are employed for packaging.
3. Products are transported by air, sea or railway.