专利名称：CONTROL VALVE FOR WATER
CONDITIONERS
发明人：RUDELICK; JOHN申请号：US41661373申请日：19731116公开号：US3867961A公开日：19750225
摘要：A two position spool type control valve wherein a single pilot valve governsoperation of a hydraulic actuator for the valve spool and also controls communication ofa drain port with one of a pair of tank ports in the valve body.
申请人：CALGON CORPORATION
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