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Where is it more correct to install a check valve on the pump?

Pavel

Topic created April 8, 2019

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Good afternoon! Please tell me how it is easier to solve this question: there is a centrifugal pump (purchased for pumping water in case of flooding of small volumes or pumping water from the tank), it is rarely used - 2-3 times a year and every time there is a problem to effectively fill the suction pipe ( f 20 mm) to start the pump. Typically, the water source is on or near the surface.

Tell me where to put the check valve in order to make it easier to start the pump if necessary to pump out water?

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Expert
Nikolay Fedorenko
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To answer
Good afternoon. To make it clear to other users, we will tell a little about the pump. The centrifugal pump has a wheel with blades bent in the opposite direction of axial motion. During operation of the centrifugal pump, these blades repel the incoming liquid medium into the diffuser region. When the axle wheel moves, increased pressure is created and the water driven through the pump moves to the outlet. In the center is the same wheel, the zone is discharged to reduced pressure to suck in water from the supply pipe, that is, the suction line.
To create centrifugal force, it is necessary that the housing is constantly filled with water. But when it stops, it will naturally disappear from there, so a check valve is installed.
Many copies are broken in the forums at the location of this part, which is necessary to maintain water in the system. My personal opinion is that in order to prevent water from flowing out of the pump casing during shutdown, a non-return valve should be installed on the suction flange.
But the second option, to install a supply hose with a strainer at the end, also has a difference, with the difference that you need to fill the pipe easier to start the pump, and in this case, you will have to fill the entire pipeline. And it’s more difficult to discharge the system, although the craftsmen thought up this option and connected the cables to the hose.
The first photo shows the pump suction pipe, the second shows the option of installing a check valve at the end of the suction pipe.
Attached photos:

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