Valve for machines having a reciprocating piston

Claim 1

A SUCTION VALVE MECHANISM FOR MACHINES OF THE TYPE INCLUDING A CYLINDER WALL AND A RECIPROCATING PISTON THEREIN, COMPRISING AN ANNULAR APERTURED VALVE SEAT MEMBER FORMING AN AXIAL EXTENSION OF THE CYLINDER WALL SO AS TO ALLOW THE PISTON TO ENTER THEREINTO, SAID VALVE SEAT MEMBER COMPRISING A RING HAVING PERIPHERALLY SPACED OPENINGS EXTENDING SUBSTANTIALLY RADIALLY THERETHROUGH, THE SEATING SURFACE OF SAID SEAT MEMBER BEING COAXIAL WITH THE INNER CYLINDER SURFACE BUT SITUATED AT A LARGER RADIAL DISTANCE FROM THE AXIS OF THE CYLINDER THAN SAID CYLINDER SURFACE SO AS TO LEAVE AN ANNULAR SPACE BETWEEN ITSELF AND THE PISTON IN THE UPPERMOST POSITION THEREOF, AN ANNULAR CYLINDRICAL VALVE MEMBER LOCATED IN SAID SPACE, SAID VALVE MEMBER INCLUDING OBLONG VALVE BLADES, SAID VALVE BLADES BEING MOUNTED AT THEIR ENDS REMOTE FROM THE CORRESPONDING END OF THE CYLINDER AND EXTENDING FREELY IN THE DIRECTION OF MOVEMENT OF THE PISTON IN ITS EXHAUST STROKE AND WHICH ARE CAPABLE OF BEING LIFTED FROM SAID SEATING SURFACE SUBSTANTIALLY RADIALLY INWARDS AND AN ANNULAR STOP FOR LIMITING SAID INWARD MOVEMENT OF SAID BLADES.