Multiple valve units

Claim 1

A VALVE MANIFOLD CONSTRUCTION, COMPRISING: A BLOCK HAVING AT LEAST A PAIR OF PARALLEL, ADJACENT VALVE OPENINGS THEREIN WHICH OPEN AT THEIR OUTER ENDS THROUGH ONE SURFACE OF SAID BLOCK AND WHICH EXTEND ONLY PARTWAY THROUGH SAID BLOCK SO THAT THE INNER ENDS THEREOF ARE CLOSED; VALVE UNITS SLIDABLY DISPOSED WITHIN SAID VALVE OPENINGS, SAID VALVE UNITS EACH INCLUDING A HOUSING HAVING AT LEAST ONE PERIPHERAL GROOVE AND A CENTRAL PASSAGEWAY, A FIRST PORT FOR SUPPLYING FLUID TO ONE END OF SAID PASSAGEWAY, A SECOND PORT EXTENDING FROM SAID GROOVE INTO SAID PASSAGEWAY, A VALVE SEAT IN SAID PASSAGEWAY BETWEEN SAID PORTS, A MOVABLE VALVE ELEMENT ENGAGEABLE WITH SAID SEAT, EACH OF SAID VALVE UNITS ALSO HAVING FLUID PRESSURE RESPONSIVE MEANS SLIDABLY DISPOSED IN SAID VALVE OPENING ADJACENT SAID ONE SURFACE OF SAID BLOCK AND CONNECTED TO SAID VALVE ELEMENT WHEREBY SUPPLY OF FLUID PRESSURE TO SAID VALVE OPENINGS THROUGH SAID ONE SURFACE OF SAID BLOCK WILL EFFECT MOVEMENT OF SAID VALVE ELEMENTS TOWARD OR AWAY FROM SAID SEATS; FIRST PASSAGE MEANS IN SAID BLOCK AND COMMUNICATING WITH SAID GROOVES OF SAID VALVE UNITS; SECOND PASSAGE MEANS IN SAID BLOCK AND COMMUNICATING WITH SAID GROOVES OF SAID VALVE UNITS; A COVER PLATE MOUNTED ON SAID ONE SURFACE OF SAID BLOCK, SAID PLATE HAVING A PILOT PRESSURE SUPPLY PORT COMMUNICATING WITH BOTH VALVE OPENINGS IN SAID BLOCK WHEREBY PILOT PRESSURE CAN BE SUPPLIED TO EFFECT SIMULTANEOUS MOVEMENT OF BOTH OF SAID VALVE ELEMENTS, SAID COVER PLATE HAVING PERIPHERAL WALL PORTIONS AROUND SAID PILOT PRESSURE SUPPLY PORT, SAID WALL PORTIONS OVERLYING PORTIONS OF SAID VALVE OPENINGS AND ENGAGING ONE END OF SAID VALVE HOUSINGS FOR RETAINING SAME WITHIN SAID BLOCK AND PREVENTING MOVEMENT THEREOF WITH RESPECT TO SAID BLOCK.