Solenoid operated valve

Claim 1

A SOLENOID OPERATED VALVE COMPRISING, (A) A BODY HAVING FIRST AND SECOND END WALLS AND AN INTERMEDIATE WALL DEFINING FIRST AND SECOND AXIALLY ALIGNED CYLINDRICAL CHAMBERS SEPARATED BY SAID INTERMEDIATE WALL, (B) SAID BODY HAVING AN INLET PORT FOR ADMITTING PRESSURE FLUID INTO SAID FIRST CYLINDRICAL CHAMBER, (C) SAID FIRST WALL HAVING A DISCHARGE PORT, (D) SAID SECOND WALL HAVING A VENT PORT, (E) SAID INTERMEDIATE WALL HAVING A CENTRAL PASSAGE THERETHROUGH, (F) SAID DISCHARGE PORT, SAID VENT PORT AND SAID CENTRAL PASSAGE BEING IN COAXIAL REGISTRATION WITH SAID FIRST AND SECOND CYLINDRICAL CHAMBERS, (G) A MAIN PISTON RECIPROCABLE WITHIN SAID FIRST CYLINDRICAL CHAMBER, (H) SAID MAIN PISTON HAVING A FORWARD END FACE ARRANGED TO ABUT SAID DISCHARGE PORT TO CLOSE THE SAME AND HAVING AN ANNULAR AREA CONCENTRIC WITH SAID END FACE ON WHICH PRESSURE FLUID MAY ACT, (I) SAID MAIN PISTON HAVING AN AXIAL BORE OPENING REARWARDLY AND COMMUNICATING WITH SAID CENTRAL PASSAGE, (J) SAID MAIN PISTON HAVING A FIRST PASSAGE AFFORDING COMMUNICATION BETWEEN SAID FIRST CYLINDRICAL CHAMBER AND SAID PISTON BORE, (K) SAID INTERMEDIATE WALL HAVING A SECOND PASSAGE CONNECTING SAID FIRST CYLINDRICAL CHAMBER WITH SAID SECOND CYLINDRICAL CHAMBER, (L) A SOLENOID COIL CIRCUMPOSED ABOUT SAID SECOND CYLINDRICAL CHAMBER, (M) A PILOT PISTON CONSTITUTING A SOLENOID ARMATURE RECIPROCABLE WITHIN SAID SECOND CYLINDRICAL CHAMBER, (N) SAID MAIN AND PILOT PISTONS BEING NORMALLY URGED BY DIFFERENTIALS IN FLUID PRESSURE ACTING THEREON RESPECTIVELY IN DIRECTIONS TO CLOSE SAID DISCHARGE PORT AND SAID VENT PORT, (O) SAID COIL WHEN ENERGIZED IMPOSING A FORCE ON SAID PILOT PISTON SUFFICIENT TO OVERCOME THE PRESSURE DIFFERENTIAL ACTING THEREON TO OPEN SAID VENT PORT AND TO CLOSE SAID CENTRAL PASSAGE THEREBY TO EFFECT A PRESSURE DIFFERENTIAL IN AN OPPOSITE DIRECTION ON SAID MAIN PISTON TO URGE SAID MAIN PISTON IN A DIRECTION TO OPEN SAID DISCHARGE PORT WHEREBY PRESSURE FLUID ENTERING INTO SAID FIRST CYLINDRICAL CHAMBER IS DISCHARGED THROUGH SAID DISCHARGE PORT.