Check valve issue
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This post was last edited by Keep running on 2016-12-12 15:00. I would like to ask everyone some questions regarding check valves: (1) Can the vertical check valve at the outlet of the original pump be used in a horizontal installation? (2) What is the opening pressure required for a vertical check valve? (3) Can a swing-type horizontal check valve be opened with a pipeline of DN100 operating at a pressure of around 20 KPA? If not, can a single-pull valve be used?
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 recommended; such valves are generally installed on the vertical pipe at the pump’s inlet, with the fluid flowing from bottom to top ； 3. The lift-type type has better sealing performance than the swing-type, but it creates greater fluid resistance; the horizontal type is suitable for use in horizontal pipes, while the vertical type is suitable for use in vertical pipes ； 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 ；
Vertical check valves seem to not be suitable for horizontal installation
It’s necessary to determine what type of check valve was originally used; the reply on the 3rd floor was very comprehensive.
For details, please see the third floor: vertical check valves are installed vertically
1. Examine the structure of the check valve. 2. Weight of the valve plate or a part of it. 3. It can be a swing-type one
Axial flow check valves are not restricted by the direction of installation; they are generally recommended for use at the outlet of pumps or compressors. Their ability to close quickly helps prevent backflow of the medium, which could cause the pump to run in reverse, and thus avoids water hammer effects resulting from such backflow The axial flow check valve is the most ideal valve for protecting pumps from water hammer!