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Flanged Forged Steel Check Valve


Check valve, also known as non return valve, reflux valve, one-way valve or counterbalance valve, is a valve that opens and closes automatically depending on media flowing. Main parts of flanged 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. We have swing check valve and lift check valve.


Flanged 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.


1. Small friction between sealing surfaces ensures low wear rate of flanged forged steel check valve.
2. Two times shot blasting processing of valve surface make this forged steel valve look fine and smooth.
3. CNC processing technology is adopted to produce disc.
4. Disc is with high strength and stiffness.
5. Disc restrainer is designed to prevent that the open position of disc is too high to be shut down.
6. Flanged forged steel check valve features small closing torsion and excellent sealing performance.
7. High intensity and flexibility of rocker are beneficial to close disc.
8. The disc sealing surface can be customized. Customer can choose sealing material according to media in order to increase sealing property and wear resistance according to requirement.

Pressure: CLASS150~600

1. Bolted Bonnet or Welded Bonnet
2. Full Port
3. Swing Type 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 Flanged 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 Forged Steel 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 valve is fully opened.


Flanged 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.


1. Before installing flanged forged steel check valve, please make sure
1) The valve agrees with operating requirement.
2) No dirt is attached to valve cavity.
3) Screw bolt is evenly screwed down.
4) The opening and restoration performance is flexible (by pushing the disc from entrance).
2. When installing flanged forged steel check valve, please ensure that
1) The media flow direction should be consistent with the arrow direction marked on valve body.
2) Vertical disc lift check valves should be installed on vertical pipes.
3) Horizontal disc lift check valve should be mounted on horizontal pipes.
3. When operating flanged forged steel check valve, do not make the forged steel valve bear weight in pipeline. Large check valve should have independent support to ensure that the valve will not be affected by pressure from pipe system.

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


1. The flanged forged steel check valve that is not to install temporarily should be stored in dry and ventilated room, side flange of the flanged valve must be sealed.
2. The valve for long-term storage should be checked regularly. The surface of the valve must be clear of dirt and coated with anti-rust oil.
3. The following conditions of flanged forged steel valve should be inspected regularly after installation:
1) Wear pattern of sealing surface
2) Wear pattern of rotary rocker
3) Dirt accumulation between the inner chamber of the valve body and sealing surface
4. Sealing performance test should be implemented after every time maintenance and assembly of the flanged forged steel check valve.

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. Items are transported by air, sea or railway.
4. All our forged steel valves have 18 months warranty.