Filtering equipment for fluids

Claim 1

EQUIPMENT FOR FILTERING IMPURITIES FROM FLUIDS COMPRISING A CASING HAVING AN INLET PORT FOR UNFILTERED FLUIDS AND AN OUTLET PORT FOR FILTERED FLUIDS, FILTER MEANS IN SAID CASING THROUGH WHICH FLUID MAY FLOW FROM SAID INLET PORT TO SAID OUTLET PORT, FOR FILTERING OF SUCH FLUID, SAID FILTER MEANS HAVING A FLUID PORT AS ITS UPPER END, A CHAMBER IN SAID CASING POSITIONED ABOVE SAID FILTER MEANS IN COMMUNICATION WITH THE FLUID PORT THEREOF, SAID OUTLET PORT BEING IN COMMUNICATION WITH SAID CHAMBER, AN ACTUATING CYLINDER HAVING A PISTON SLIDABLE THEREIN, MEANS PROVIDING COMMUNICATION BETWEEN ONE SIDE OF SAID PISTON AND SAID CHAMBER, VALVE MEANS ASSOCIATED WITH THE INLET PORT AND MOVABLE BETWEEN TWO POSITIONS, ONE OF SAID POSITIONS PROVIDING COMMUNICATION BETWEEN SAID INLET PORT AND SAID CASING FOR FLOW OF UNFILTERED FLUID THROUGH SAID FILTER MEANS, AND THE OTHER POSITION PROVIDING COMMUNICATION BETWEEN SAID INLET PORT AND THE OTHER SIDE OF SAID PISTON, AND MEANS CONTROLLED BY MOVEMENT OF SAID PISTON IN SAID CYLINDER BETWEEN THE ENDS THEREOF TO EFFECT SUCCESSIVE MOVEMENT OF SAID VALVE MEANS BETWEEN ITS TWO POSITIONS, WHEREBY WHEN SAID PISTON IS MOVED TOWARD SAID CHAMBER WHEN SAID INLET PORT IS CONNECTED TO SAID OTHER SIDE OF SAID PISTON A PORTION OF THE FILTERED FLUID IN SAID CHAMBER ABOVE SAID PISTON WILL BE FORCED THROUGH SAID OUTLET PORT AND ANOTHER PORTION THEREOF WILL BE FORCED INTO THE FLUID PORT OF SAID FILTER MEANS FOR FLOW THROUGH THE FILTER MEANS IN REVERSE DIRECTION TO CLEAN THE FILTER MEANS.