Typically, check valves have a gate, ball, diaphragm, or disc that is pressed against a seal to close the check valve. If the upstream pressure falls below the cracking pressure or there is back pressure (flow attempting to move from the outlet to the inlet), the check valve will close. This minimum upstream pressure at which the valve opens is called the check valve's ‘cracking pressure.’ The specific cracking pressure changes based on the valve design and size, so ensure that the system’s pressure can generate the cracking pressure of the chosen check valve(s). How does a check valve work? Cracking pressureĪ check valve requires a minimum upstream pressure (pressure differential between inlet and outlet) to open the valve and pass the media through it.
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