flow check vs swing check

grindog

what type of application would a spring check be used over a flow check or does it really matter just base it on personal choice

J.C.A._3

We've been using,

Pumps with internal checks for so long now I don't even think much about it.(they are spring checks). Either will work. Sometimes spring check will rattle but so don't flow checks that get air trapped in them.

I don't know the answer but have used both with great sucess.My personal favorites are internal. Chris

Sweet_2

The only analogy I

can relate it to is with backflow preventors such as an RPG the spring check , or soft seated check valve is located on the inlet side of the RPG and allows a slower close rate than a swing check so to cause less pressure surge,"water hammer". Which in the case of an RPG , would cause it to spit water.

hr

Maybe spring but not

swing checks. Swing checks generally just have a brass flapper. A for sure noise maker

Look for a spring check with a EPDM or teflon soft seat. Ideally a cone shaped valve for friendlier flow. The flat disc type seem to be noise makers also.

I agree properly installed, and purged internal check pumps should be very quiet.

hot rod

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Kevin__Flynn

A swing or spring check does not rely on the head pressure of a pump to open where a flo-check does.

In the attached picture, you will see that the placement of the spring check is used to stop the return of the first pump from going through the 4-way mixing valve instead of the boiler. If this was a flo-check there would be no pump pressure to open it and allow for flow from the 4-way valve back to the boiler.

In the case of where you would use a spring check over a swing check, a spring check can be used in any position, while a swing check needs to be in the horizontal position.

hope this helps.

kf