What are the problems associated with the use of bottom valves in self-priming pumps that have such valves installed?
Thread Content
During the selection process for the pump used to discharge oil from the oil sump, if a self-priming pump equipped with a bottom valve is used, what problems may arise with this bottom valve during operation? I would appreciate some advice from experts
What kind of self-priming pump is that with a bottom valve? How many meters of lift can the original poster achieve?
Mainly, the bottom valve doesn’t close tightly, which leads to leaks
This troublesome issue is that the bottom valve disc often fails to return to its original position, causing all the water at the inlet to leak away, and as a result the self-priming pump is unable to draw in enough water. .
1. A self-priming pump is not supposed to require a foot valve. 2. It is also possible to install a bottom valve, which can prevent debris from entering and make it easier to start the pump. 3. The diameter of the foot valve should be increased appropriately, but not too much; the weight of the valve disc itself must not exceed the suction power of the self-priming pump. 4. Over time, it is necessary to clean the debris wrapped around the bottom valve.
Flow rate: 5 m³/h, suction height: 50 meters
This is generally used in environments where the medium is dirty; there is internal leakage in the valve, and no liquid flows out of it. In the case of heavy oil pipelines, the fluid tends to solidify, and there are many impurities which can damage the valve, making maintenance and replacement difficult. Now, strong self-priming pumps are generally used.
The bottom valve does not seal properly, so water needs to be filled in every time the pump is started. The bottom valve may be clogged
The bottom valve does not move smoothly and does not return to its proper position
If a bottom valve is indeed necessary, consider the sealing performance (soft seals are preferred)； It should have good guidance to ensure a tight seal when returning to its original position.
It can be determined that the performance of this self-priming pump is likely to be suboptimal; installing a bottom valve makes cleaning a hassle, and it may also affect its performance