| 摘要 |
Apparatus including a plurality of coaxial pistons reciprocable in unison in a chamber of a pump body for simultaneously admitting different fluids to and discharging them from the chamber, the pistons defining fluid-metering compartments and an operating compartment in the chamber, means for supplying fluids to the chamber including a tank for one of the fluids, and supply and return means including a conduit in permanently open communication with the operating compartment for alternatively supplying said one fluid in raw condition thereto for operating the pistons and for returning said one fluid when spent to the tank to be conditioned for subsequent discharge.
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