Check valve before or after

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s10010001

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Is the check valve best before or after my jet pump and CSV? or in between?

Mine is currently (and has been for some time) in the input side, before my jet pump. Between my jet pump and storage tank.

just noticed some other diagrams reading around looking for info and thinking maybe I have it wrong.
 

Fitter30

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Check in between pump discharge and csv.
 

s10010001

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Yea that’s where line is now, on the suction line, a larger 1 1/4” brass check valve about 6” from the pumps inlet. Seems to work fine, I guess I’ll leave it alone then thanks.
 
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