- 1. a. Closed from beneath. Source: opted
- 2. Closed from beneath. Undershut valve (Mach.), a valve which shuts by being lifted against a seat facing downward. Knight. Source: webster
- 3. Closed from beneath. Undershut valve (Mach.), a valve whichshuts by being lifted against a seat facing downward. Knight. Source: adambom
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undershut
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