Check valve whether installed in front of the valve or after the valve does not affect the function.
Check valve installation precautions
1, check valve is a one-way valve, so the installation position, height, inlet and outlet direction must be in line with the design requirements, the direction of media flow should be the same as the direction of the arrow marked by the valve body.
2, the installation of check valves should be checked before the appearance of the valve nameplate should be consistent with the current national standards, "General Valve Signs" GB 12220. The standards are qualified before use.
3, do not let the check valve in the pipeline to bear the weight, especially large check valves, should have independent support from the pressure generated by the pipeline.
Expanded Information:
. p>Check valves can also be used to supply piping to auxiliary systems in which the pressure may rise above the system pressure. Check valves can be mainly divided into swing check valve (rotating according to the center of gravity) and lift check valve (moving along the axis).
The role of this type of valve is to allow the medium to flow in one direction only, and prevent the opposite direction of flow. Usually this valve is automatic work, in one direction of flow of fluid pressure, the valve flap open; fluid flow in the opposite direction, by fluid pressure and valve flap of the self-weighting valve flap action on the valve seat, thus cutting off the flow.
The check valve belongs to this type of valve, which includes swing check valve and lift check valve. The swing check valve has a hinged mechanism and a door-like flap that rests freely on the sloping seat surface.
Baidu Encyclopedia - Check Valves