The check valve does have an internal spring. They can be mounted in any position and will allow free flow in one direction and checked flow in the opposite direction.
answered 5 years, 2 months ago
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I highly recommend that you stay clear of the check valve in your suction line, if you are using a hydraulic pump. I did not see a cracking pressure for this check valve, but chances are high that it is around 5psi (5psi is pretty common) which means it will create a vacuum of ~10inHg. If your pump is a hydraulic pump, this is a disaster waiting to happen. You always want to keep pump inlet vacuum to a bare minimum, because if the vacuum gets too high you will cavitate your pump and that is a sure death sentence for it. If you need a check valve to keep an oil column in your suction line, you are probably dangerously close to cavitating the pump already.
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