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Check the structure of the valve
The purpose of this type of check valve is to allow only the flow of media in one direction and to prevent flow in the other direction. This valve is usually automatic work, in one direction under the flow of fluid pressure, the check valve flap open; fluid flow in the opposite direction, by the fluid pressure and the check valve flap self-coincidence flap acting on the valve seat , Thus cutting off the flow. Check valve which belongs to this type of valve, surrogate it includes a 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 check valve flap is designed on the hinge mechanism so that the valve flap has sufficient 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. This check valve in addition to the valve can be freely raised and lowered, the rest of the stop valve as the same as the cut-off valve, the shelf fluid pressure so that the flap from the valve seat sealing surface lifted, the media back to cause the valve flap down to the seat 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 pad or rubber ring inlaid on the check valve disc holder. Like the cut-off valve, the passage of the fluid through the lift check valve is also narrow, so the pressure drop of the pressure relief valve through the lift check valve is larger than that of the swing check valve and the flow of the swing check valve Limited by the restrictions.
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