The cracking pressure of the valve will be about the same as the pressure gauge measurement when there is detectable flow through the check valve. The pressure of the air coming into the check valve can be gradually increased using the control valve. The check valve is then placed in a container filled with water. It involves attaching a pressurized air line with a control valve and a pressure gauge to the inlet side of the check valve. Detectable flow is when the check valve allows a small but steady flow of liquid or gas to pass through the valve body and out through its outlet port.Ī check valve’s cracking pressure is a technical specification and is usually provided as psi or psig (pounds per square inch or pounds per square inch gauge) or bar (the metric equivalent of psi and psig) or both.Ī more precise way to describe check valve cracking pressure is to say that it is a measure of the pressure differential between the valve’s inlet and outlet ports when flow is first detected.Īn inexact but informative way to test cracking pressureA simple air pressure test is an easy way to estimate the cracking pressure of a spring loaded check valve. What is check valve cracking pressure?Cracking pressure is the minimum upstream pressure required to open a check valve enough to allow detectable flow.
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