Questions about check valves

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Installation requirements for check valves: Classified by structure, check valves can be divided into lift-type check valves, swing-type check valves, and butterfly check valves. Lift-type check valves can be divided into vertical and straight-through types... 1. Straight-through lift check valves can be installed in both horizontal and vertical pipes ； 2. For the inlet pipeline of the water pump, a foot valve is advisable; such valves are generally installed only on vertical pipes at the pump inlet, with the fluid flowing from bottom to top ； 3. The lift-type type has better sealing performance than the swing-type, but it presents greater fluid resistance; the horizontal type is suitable for use in horizontal pipelines, while the vertical type is suitable for use in vertical pipelines ； 4. The installation location of the swing check valve is not restricted; it can be installed on horizontal, vertical, or inclined pipelines. When installed on a vertical pipeline, the flow direction of the medium should be from bottom to top ； 5. The installation location of the butterfly check valve is not restricted; it can be installed on horizontal pipelines as well as on vertical or inclined pipelines ； A slow-closing check valve is a type of check valve installed at the outlet of pumps in high-rise building water supply systems as well as other water supply systems, designed to prevent backflow of the fluid and the occurrence of water hammer effects.

It depends on the specific operating conditions. Double-disc wafer check valves and axial flow check valves contain springs inside; the valve discs are returned to their original position by these springs. Under high-temperature and high-pressure oxygen conditions, the springs are prone to breaking due to fatigue, so their use is not recommended.