Packing (Plunger Pump)

A set of formed, malleable rings used to seal the joint between a stationary casing and rotating shaft or a reciprocating plunger. The function of packing is to control leakage, but not to eliminate it completely. The packing must be lubricated and a flow from 40 to 60 drops per minute out of the stuffing box must be maintained for proper lubrication.