Mixing valve for automatic washing machine

Claim 1

AN IMPROVED HOT AND COLD WATER MIXING VALVE SUITABLE FOR AUTOMATIC WASHING MACHINES WHICH COMPRISES, A VALVE BODY HAVING A MIXING CHAMBER, HOT AND COLD WATER INLETS, SELECTIVELY OPERABLE VALVES FOR CONTROLLING THE ADMISSION OF HOT AND COLD WATER TO SAID MIXING CHAMBER, SEPARATE PASSAGEWAYS LEADING FROM SAID HOT AND COLD WATER INLETS TO SAID VALVES, A PRESSURE EQUALIZING DEVICE COMPRISING A PRESSURE-SENSING PISTON PORTION AND PLATE-LIKE THROTTLING VALVE PORTIONS PROJECTING FROM OPPOSITE ENDS THEREOF AND EXTENDING ACROSS EACH OF SAID PASSAGEWAYS, A CYLINDER WALL IN SAID VALVE BODY COMMUNICATING AT ITS OPPOSITE ENDS WITH SAID PASSAGEWAYS ON THE DOWN-STREAM SIDE OF SAID THROTTLING VALVE PORTIONS AND OPERATIVELY POSITIONING SAID PISTON PORTION FOR BACK AND FORTH GUIDED MOVEMENT TOWARDS A CLOSING-OFF POSITION WITH RESPECT TO ONE OF SAID PASSAGEWAYS IN ITS FORWARD MOVEMENT AND TOWARDS A CLOSING-OFF POSITION WITH RESPECT TO THE OTHER OF SAID PASSAGEWAYS IN ITS BACKWARD MOVEMENT, SAID PISTON PORTION MOVING SAID THROTTLING VALVE PORTIONS IN ONE DIRECTION TO PROGRESSIVELY THROTTLE THE HOT WATER PASSAGEWAY WHILE PROGRESSIVELY OPENING THE COLD WATER PASSAGEWAY AND IN THE OPPOSITE DIRECTION TO PROGRESSIVELY THROTTLE THE COLD WATER PASSAGEWAY WHILE PROGRESSIVELY OPENING THE HOT WATER PASSAGEWAY, SAID PISTON PORTION HAVING A LOOSEFLOATING FIT WITHIN SAID CYLINDER WALL, AND MEANS ADJACENT OPPOSITE ENDS OF SAID CYLINDER WALL AGAINST WHICH SAID PISTON MOVES AT OPPOSITE ENDS OF ITS BACK AND FORTH MOVEMENT THEREIN FOR PREVENTING FLOW OF WATER AROUND SAID PISTON.