| 摘要 |
The present invention is directed to pump apparatus for purifying water. The apparatus includes a housing containing a reciprocating plunger pump with a permanently attached filtering module preferably containing a reverse osmosis element. A manifold with a hydraulic actuated shuttle which serves as the spool for a three way valve is attached to the pump housing. The valve provides alternate pressurization and exhaust for the rod side of the piston. The pump may be operated by a hand lever or by power mechanism.
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