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Check valve
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== Technical terminology == ;Cracking pressure: Refers to the minimum pressure differential needed between the inlet and outlet of the valve at which the first indication of flow occurs (steady stream of bubbles). Cracking pressure is also known as unseating head (pressure) or opening pressure.<ref>{{cite web|url=https://www.neoperl.net/en/oem/products/checkvalves/glossary.html|title=NEOPERL|website=www.neoperl.net}}</ref> ;Reseal pressure: Refers to the pressure differential between the inlet and outlet of the valve during the closing process of the check valve, at which there is no visible leak rate. Reseal pressure is also known as sealing pressure,<ref>{{cite web|url=https://www.usplastic.com/catalog/item.aspx?itemid=85515&catid=489|title=GF PVC Cone Check Valves Type 561 & 562 | author=U.S. Plastic Corp.|website=www.usplastic.com}}</ref> seating head<ref>{{cite web|url=https://www.usplastic.com/catalog/item.aspx?itemid=23972&catid=489|title=NIBCO® Chemtrol® TruUnion Ball Check Valves |author= U.S. Plastic Corp. | website=www.usplastic.com}}</ref> (pressure) or closing pressure.<ref>{{cite web|url=https://www.neoperl.net/en/oem/products/checkvalves/glossary.html|title=NEOPERL|website=www.neoperl.net}}</ref> ;Back pressure: a pressure higher at the outlet of a fitting than that at the inlet or a point upstream
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