What is the cracking pressure of a check valve
Check valves, regardless of the individual design, serve the specific purpose of permitting the flow of the service medium in one direction while intentionally preventing, or at least limiting, the flow of said medium in the reverse direction. Whether an inline check valve , wafer check valve, swing check valve or lift check valve, each version will necessarily have a dynamic element, whether disc, door, flapper, or ball, whose movement directly corresponds to the opening or closing of the subject flow path. Depending upon the specific type of check valve under consideration, gravity or spring force can play a role in keeping this dynamic element closed against the valve seat when the upstream pressure or flow in the desired direction proves insufficient to push or lift the disc, door, flapper, or ball into the open position. Since the flow of the medium in the desired direction in every check valve necessarily faces some level of resistant force, whether gravity,...