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Flanged Forged Steel Pressure Seal Check Valve

Description

Check valve, also known as non return valve, reflux valve, one-way valve or counterbalance valve, opens and closes depending on media flowing pressure. Check valve can be classified into swing type and lift type. Flanged forged steel pressure seal check valve is mainly made up of valve body, disc, bonnet and gasket. It is used to prevent reverse flow and leakage of medium, such as fluid, gas, etc. This flanged forged steel valve is also applied to stop reversal of pump and driving motor. This kind of valve can be classified according to medium pressure rating, such as 900LB, 1500LB and 2500LB.

Applications

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

Working Principle

Flanged forged steel pressure seal 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 PN16.0~42.0

1.Pressure Sealed Bonnet
2.Full Port
3.Lift Type
4.Flange Ends/Butt-Welding Ends

Technical Specification


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/T12221 JB/T96-95
Flange Ends ASME B16.5 GB/T9113 JB/T82.1-82.4
Buttwelding Ends ASME B16.25 GB/T12224
Inspection & Test API598 JB/T9092

Material List for Main Parts of Flanged Forged Steel Pressure Seal 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. d LRF LBW LRTJ H
CLASS900-2500
CLASS900 PN16.0 15 1/2 13 216 216 216 117.5 10.5
20 3/4 18 229 229 229 117.5 11.9
25 1 24 254 254 254 117.5 13.9
32 1-1/4 29 279 279 279 149 26.9
40 1-1/2 36.5 305 305 305 149 25.1
50 2 46.5 368 368 371 195 32
CLASS1500 PN26.0 15 1/2 13 216 216 216 117.5 10.5
20 3/4 18 229 229 229 117.5 11.9
25 1 24 254 254 254 117.5 13.9
32 1-1/4 29 279 279 279 149 26.9
40 1-1/2 36.5 305 305 305 149 25.1
50 2 46.5 368 368 371 195 32
CLASS2500 PN42.0 15 1/2 13 264 264 264 125 12.6
20 3/4 18 273 273 273 125 14.9
25 1 24 308 308 308 125 16.5
32 1-1/4 29 349 349 352.2 166 28
40 1-1/2 36.5 384 384 387.2 166 27.6
50 2 46.5 451 451 454.2 210 34.5
Note: H means the height when flanged forged steel pressure seal check valve is fully opened.

Malfunction, Reason and Solution


Malfunction Reason Solution
Disc Breakage 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. Applying ductile materials to manufacturer valve disc
Medium Backflow 1. Sealing surface is damaged. 2. Impurities are sandwiched between sealing surfaces. Repairing the sealing surface or cleaning impurities

Payment, Package, Transportation & Warranty

1. Products 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. Flanged forged steel pressure seal check valves are transported by air, sea or railway.
4. All our non return valves have 18 months warranty. Lifelong technology consultancy service is available for our products.