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Piston check valve is to rely on the flow of the medium itself automatically open and close the valve flap, used to prevent the media back to the valve, also known as check valve, check valve, counterflow valve, and back pressure valve. Check valve is an automatic valve, its main role is to prevent media backflow, to prevent the pump and drive motor reversal, and the release of container media. Check valves can also be used on lines where the pressure may rise above the system pressure on the auxiliary system. The purpose of this type of valve is to allow only the medium to flow in one direction and to prevent the flow in the direction. Usually this kind of valve is automatic working, the valve flap opens under the fluid pressure flowing in one direction; when the fluid flows in the opposite direction, the valve flap is acted upon by the fluid pressure and the self-weight of the valve flap to cut off the flow. One female check valve, butterfly check valve belongs to this type of valve, which includes the swing check valve and lift check valve. Swing check valves have a hinged hinge mechanism and a flap-like flap freely rests against the slanted seat surface. To ensure that the valve flap reaches the proper seating surface every time, the valve flap is designed in the hinge mechanism so that the valve flap has enough swivel-open space for true and complete valve flap contact. The valve flap can be made entirely of metal, or it can be fitted with a leather, rubber or synthetic cover over the metal, depending on the performance requirements. Swing check valve in the fully open condition, the fluid pressure is almost unimpeded, so the pressure drop through the valve is relatively small. Lift check valve seat is located on the valve seat sealing surface. In addition to the valve flap valve can be freely up and down, the rest of the same as the cut-off valve, the fluid pressure from the valve seat sealing surface lift up, the media back to the valve seat caused by the valve back down and cut off the flow. Depending on the conditions of use, the valve disc can be of all-metal construction or it can be in the form of a rubber gasket or rubber ring inlaid on the valve disc holder. Like the stop valve, the passage of fluid through the lift check valve is also narrow, so the pressure drop through the lift check valve is larger than the swing check valve and the flow through the swing check valve is limited Few. A, the structure and installation of piston check valve: 1, the piston disc check valve disc shape, around the valve seat passage for rotation shaft rotation, because the valve into the streamline flow channel, the flow resistance ratio Butterfly-type check valve is small, suitable for low-flow rate and the occasional changes in the flow of large-diameter occasions, but not for pulsatile flow, the sealing performance is less than the lift. Butterfly check valve single-valve, double-valve and most of the three, these three forms are mainly based on the valve caliber, the purpose is to prevent the media stop flowing or backwards, weakened the hydraulic impact. 2, the piston check valve flap along the valve body vertical centerline sliding check valve, the female check valve can only be installed on the horizontal pipe, the valve can be used in high pressure small-diameter check valve ball. Butterfly check valve body shape and the same cut-off valve (common with the cut-off valve), so it has a larger fluid resistance coefficient. Its structure is similar to the cut-off valve, the valve body and the valve and the cut-off valve the same. The upper part of the valve plate and the lower part of the valve cover are machined with a guide sleeve which is simple and can be freely guided and guided by the valve guide. When the medium flows downstream, the valve plate is opened by the medium thrust. When the medium is stopped, Drop falling on the valve seat, play a role in blocking the media countercurrent. Straight through butterfly check valve medium inlet and outlet channel direction and seat channel vertical; vertical lifting check valve, the media import and export channel direction and valve seat channel in the same direction, the flow resistance than the straight-through small. 3, piston check valve: valve around the valve seat in the rotation of the check valve. Disc check valve structure is simple, can only be installed on the horizontal pipe, sealing better. 4, piston check valve: the valve along the valve body center line sliding valve. Pipeline check valve is a new type of valve, its small size, light weight, good processing technology, is one of the development direction of the check valve. But the fluid resistance coefficient is slightly larger than the swing check valve. 5, compression check valve: This valve is used as a boiler feed water and steam shut-off valve, it has a lift check valve and globe valve or angle valve of the integrated function. In addition, there are - some do not apply to the pump outlet installed check valve, such as the end of the valve, spring, Y-type check valve. B, Piston Check Valve Uses: This valve is used in industrial piping to prevent media countercurrent device. C, the role of piston check valve principle and structure Description: 1, when the media flow in accordance with the provisions of the direction, the disc by the force of media, was opened; media countercurrent, due to valve flap weight and the valve by the media in the opposite direction The role of force, so that the sealing surface of the valve disc and valve closure close to achieve the purpose of preventing the media countercurrent. 2, the valve body and valve sealing surface using stainless steel surfacing. 3, the length of the structure of the valve according to the provisions of GB12221-1989, flange connection size by JB / T79-1994 requirements.