Prerequisite knowledge: check valve construction, installation points

1), the installation location, height, import and export direction must meet the design requirements, pay attention to the flow direction of the media should be consistent with the direction of the arrow arrow, the connection should be firmly tight. Because the check valve is to rely on the flow of the media itself and automatically open and close the valve flap, used to prevent the media back flow of 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 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). In this case,

The role of the check valve is to allow only one direction of medium flow, and to prevent the reverse direction of 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. In this case,

2), the valve must be installed before the appearance of inspection, the valve nameplate should be consistent with the existing national standard "General Valve Logo" GB 12220 requirements.

For working pressure greater than 1.0 MPa and cut off in the trunk pipe to play the role of the valve, the installation should be carried out before the strength and rigorous performance testing, qualified after the quasi-use.

Strength test, the test pressure is 1.5 times the nominal pressure, duration of not less than 5min, valve shell, packing should be no leakage for the pass. Tightness test, the test pressure 1.1 times the nominal pressure; test duration consistent with GB 50243 requirements. In this case,

3) Do not subject the check valve to weight in the pipeline. Large aetv One-way valves: should be independently supported so as not to be affected by the pressure generated by the piping system