Assertion: valve's spring | /r/CapableOf | close the valve
Facets:
value: except is depressed
type: OTHER
Source sentences:
text: When the pressure going through the valve goes below the cracking pressure, the spring will close the valve to prevent back-flow in the process.
text: Their chief differences are that Schrader valves are larger and have springs that close the valve except when the pin is depressed.