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Check valves are used as isolation valves that permit flow in one direction but stop flow in the opposite direction, to isolate well-servicing equipment from high-pressure treating fluids during fracturing applications. The flapper check valve provides a safety device in the flow line to assure that pressure and fluid cannot backup into the manifold area or into the pumps.  Flapper check valve consist of valve body, adaptor body, valve seat, flapper, union nut and etc., valve body, adaptor body, valve seat, flapper, union nut and etc. are made of high quality alloy steel, flapper is made of stainless steel, check valves are available in 2" & 3" sizes from 10,000 psi to 15,000 psi for well service applications such as acidizing, cementing and fracturing. Each check valve has a nameplate marked with size and pressure, and this working pressure corresponds to the maximum pressure acceptable for either end connection.
 Seat and body of the valve are separate to assure the seat can be replaced fast and easily as needed. And carboxylated nitrile flapper face is abrasion resistant against a complete range of well fluids.
 Female end of check valve is for inlet while male end is for outlet.  

Check valve can be available with flapper check valve and top entry check valve.