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A pump outline moving a fixed volume per stroke.
Also known as: Reciprocating pump symbol, PD pump symbol, Metering pump symbol
On a process diagram a positive displacement pump is drawn with an outline distinguishing it from a centrifugal pump, moving a fixed volume regardless of the pressure it works against.
Denotes a pump delivering a fixed volume per stroke or revolution independent of discharge pressure.
Contexts: Technical drawing
Requires a relief path on its discharge, because a closed valve downstream of a positive displacement pump has nowhere for the flow to go.
Contexts: Technical drawing
A rectangle or circle outline with an internal mark showing a piston or gear rather than the smooth curve of a centrifugal impeller.