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.
