Forged steel check valve valve flap and seat sealing surface using cobalt-based hard alloy plasma spray welding from ****gh hardness, corrosion resistance, durable. Suitable for nominal pressure PN1.6 ~ 42.0Mpa working temperature 600 ℃ petroleum, chemical, hydraulic, thermal power station and other working conditions of the pipeline to cut off or connect the media. Valve flap, valve seat sealing surface using iron-based alloy or Stellite (Stellite) cobalt-based hard alloy overlay weld surface into wear-resistant, ****gh temperature, corrosion resistance, good anti-scuffing performance and long service life characteristics. Stainless steel pin and flap connection using the internal structure - excellent performance - more reliable sealing. The product is widely used in petroleum, chemical, pharmaceutical, electric power industry and other working conditions of the pipeline to prevent the backflow of media role. Applicable media for water, oil, steam, gas and some corrosive liquid media.

Forged steel check valve has three kinds of bonnet design, the first is bolt type bonnet, connected by concave and convex surface, using stainless steel belt and flexible grap****te winding gasket, according to the demand can also use ring connection, the second is welded type bonnet, through thread sealing after welding, according to the demand can also be directly used rigid welding, the t****rd is self-sealing bonnet, through thread and self-sealing bonnet connection. There are also three different structural designs of forged steel check valves, w****ch are: riser type forged steel check valve, spherical type forged steel check valve and swing type forged steel check valve.

Check valve opening and closing parts rely on media flow and force to open or close, in order to prevent the backflow of media. Check valve is generally divided into four types of lift, swing, butterfly and horizontal, through lift check valve should be installed in the horizontal pipeline, vertical lift check valve and bottom valve is generally installed in the vertical pipeline, and the media flow from the bottom up, swing check valve installation position is not restricted, usually installed in the horizontal pipeline, but can also be installed in the vertical pipeline or dumping pipeline. Note: check valve only allows the media to flow in one direction, should pay special attention to the direction of media flow, should make the normal direction of media flow and the direction of the arrow indicated on the valve body, otherwise it will cut off the normal flow of media.

Structural features.

1, the guide tendons on the welded carbide valve body upper cavity guide sleeve made of stainless steel material to ensure flexible valve flap action.

2、The sealing surface of valve flap and valve seat is made of cobalt-based cemented carbide plasma spray welding with ****gh hardness, anti-corrosion and durability.

3, advanced pressure seal design and ****gh-purity grap****te gasket ring to ensure ****gh gas tightness.

4、The valve cavity adopts pressure self-tightening sealing structure, the ****gher the inner cavity pressure the better the sealing performance.

5、The valve flap rotates around the pin outside the valve seat to reduce the violent impact that occurs when closing.