最好最新高清中文字幕电影

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        American standard check valve

        Location:Home > American standard check valve

        American Standard liftcheckvalves H41W H41H

        Date:[2017-03-15]    hits: American Standard liftcheckvalves H41W H41H

        Stainless steel lift check valve H41W

        Lift check valve is to rely on the media itself to flow and automatically open and close the valve to prevent the media back to the valve, also known as check valve, check valve, reversing 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 reversal, as well as the release of the container medium. The check valve can also be used to provide a supply of pressure which may rise to more than the pressure of the system. Check valve can be divided into swing check valve (according to the center of gravity rotation) and lift check valve (along the axis of movement).

        Check valve is to allow the media to flow in one direction only, and to prevent reverse flow. Usually the valve is automatically work, fluid pressure flow in one direction, the valve open; the opposite direction of fluid flow by gravity, fluid pressure and valve closing effect on the valve seat, thereby cutting off flow. The internal thread check valve, butterfly check valve belongs to this type of valve,

        The utility model relates to a lift check valve which comprises a swing check valve and a lifting check valve. Swing check valve has a hinge mechanism, as well as a door like valve free to lean on the surface of the seat tilt. In order to ensure that the valve flap can reach the appropriate position of the valve seat every time, the valve flap design in the hinge mechanism, so that the valve flap is sufficient to have a swing space, and make the valve real, comprehensive contact with the valve seat. Valve can be all made of metal, can also be placed on the metal leather, rubber, or synthetic coverage, 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 is located on the valve seat sealing surface. In addition to this valve disc is free to lift, like the rest of the cut-off valve, the fluid pressure valve from the valve seat sealing surface lift, medium return led down to the valve seat, and cut off the flow. According to the conditions of use, the valve flap can be all metal structure, you can also be on the valve frame mounted rubber pad or rubber ring form. The same as the cut-off valve, lift check valve fluid through the channel is narrow, so the check valve by lifting the pressure drop than the swing check valve a little bigger, and swing check valve flow restrictions very little.

        1, the valve must be blocked at both ends of the passage, there is a dry ventilated room. Such as long-term storage, should be regularly checked for corrosion.

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

        3, the installation must be carefully check the valve plate on the signs and are consistent with requirements.

        4, lift vertical 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 it is not affected by the pressure of the pipe system.

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

        The general formula 8, lift check valve should be installed in horizontal pipe, vertical lift check valve and bottom valve is usually installed in a vertical pipe on the road, and the bottom-up flow of media.

        9, the check valve closes, will produce water hammer in pipeline pressure, will lead to serious damage to the valve and piping or equipment, especially for the big pipe or high pressure pipeline, it should pay attention to those who use check valve.


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