最好最新高清中文字幕电影

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        Swing check valve

        Location:Home > Swing check valve

        American standard lift check valve H41W

        Date:[2016-10-19]    hits: American standard lift check valve H41W

        Stainless steel lift check valve H41W

        Lift-type check valve is to rely on the flow of the media itself and automatically open and close the valve flap, used to prevent media back flow of the valve, also known as check valve, check valve, counter-current valve, and back pressure valve. Check valve is an automatic valve, its main role is to prevent the media back, to prevent the pump and drive motor reverse, and the container media release. The check valve may also be used on a line in which the supply pressure of the auxiliary system may be increased beyond the system pressure. Check valve can be divided into swing check valve (according to the center of gravity rotation) and the lift check valve (along the axis of movement).

        The function of the check valve is to allow the medium to flow in only one direction, and to prevent reverse flow. Usually the valve is automatically working, in a direction of fluid pressure, the valve flap open; the reverse flow of fluid by the fluid pressure and the valve flap valve self-acting on the seat, which cut off the flow. One internal thread check valve, butterfly check valve belongs to this type of valve,

        Lift check valve which includes swing check valve and lift check valve. Swing check valve has a hinge mechanism, as well as a door like the valve flap free to lean against the inclined seat surface. In order to ensure that the valve flap to reach the seat surface each time the appropriate position, the valve flap design in the hinge so that the valve flap has enough space to open space, and the valve real, full contact with the valve seat. The valve flap can be made entirely of metal, or it can be covered with leather, rubber, or a synthetic cover, 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 valve seat is located on the valve seat sealing surface. The valve in addition to the valve can be free to lift, the rest of the same as the cut-off valve, the fluid pressure from the valve seat sealing surface lift up, the media return valve leading to the valve seat down and cut off the flow. Depending on the conditions of use, the valve flap may be of the all-metal construction, or may be in the form of a rubber pad or rubber ring mounted on the valve disc holder. Like the cut-off valve, the passage of fluid through the lift check valve is narrow, so the pressure drop through the lift check valve swing larger than the swing check valve, and the flow of swing check valve is limited Very little.


         1, the valve at both ends of the pathway to be blocked, there is dry and ventilated room. Such as long-term storage, should always check the anti-corrosion.

        2, the valve should be cleaned before installation, and eliminate the defects caused in the transport process.

        3, the installation must be carefully check the signs on the valve and nameplate is in line with the requirements.

        4, vertical lift valve check valve should be installed in the vertical pipe.

        5, lift-type horizontal valve check valve should be installed in the horizontal pipe.

        6, do not make the check valve in the pipeline to withstand the weight of a large check valve should be independent support, so that the pressure generated by the pipe system.

        7, the installation of the check valve, the media should pay special attention to the direction of flow should be so that the normal flow direction of the media and the direction of the arrow on the valve body is consistent, otherwise it will cut off the normal flow of media. The bottom valve should be installed at the bottom of the pump suction line.

        8, General-type lift check valve should be installed in the horizontal pipeline, vertical lift check valve and the bottom valve is usually installed in the vertical pipe, and the media from bottom to top flow.

        9, the check valve is closed, will produce water hammer pressure in the pipeline, will lead to serious damage to valves, piping or equipment, especially for high-pressure pipeline or high-pressure pipeline, it should cause the selection of the check valve High attention.

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