Head pressure control for refrigeration system

Claim 1

IN A REFRIGERATING SYSTEM: (A) A CONDENSER HAVING AN INLET AND AN OUTLET, A RECEIVER CONNECTED WITH THE OUTLET OF THE CONDENSER, AN EVAPORATOR CONNECTED WITH THE RECEIVER TO RECEIVE REFRIGERANT THEREFROM, AN EXPANSION MEANS AT THE INTAKE TO THE EVAPORATOR, A COMPRESSOR HAVING AN INTAKE AND A DISCHARGE, THE SAID COMPRESSOR INTAKE BEING CONNECTED TO THE EVAPORATOR, AND (B) A CONTROL DEVICE COMPRISING AN INLET CONNECTED TO THE COMPRESSOR DISCHARGE, A FIRST OUTLET CONNECTED TO THE CONDENSER INLET, (C) A FIRST VALVE PORT BETWEEN THE DEVICE INLET AND FIRST OUTLET, (D) A SECOND OUTLET CONNECTED TO THE CONDENSER OUTLET AND RECIEVER, (E) A SECOND VALVE PORT BETWEEN THE DEVICE INLET AND SECOND OUTLET, (F) VALVE MEANS INCLUDING A FIRST AND A SECOND VALVE MEMBER OPERATIVELY INTERCONNECTED AND ASSOCIATED OPERATIVELY RESPECTIVELY WITH FIRST AND SECOND VALVE PORTS, SAID FIRST AND SECOND VALVE MEMBERS HAVING OPPOSED OUTWARDLY FACING SURFACES SUBJECTED RESPECTIVELY TO THE PRESSURES AT THE FIRST AND SECOND OUTLETS, SAID VALVE MEMBERS HAVING OPPOSED INWARDLY FACING SURFACES SUBJECTED TO THE PRESSURE AT THE DEVICE INLET TENDING TO MAINTAIN THE VALVE MEMBERS IN A SUBSTANTIALLY BALANCED CONDITION, SO THAT THE PRESSURE AT THE DEVICE INLET HAS NO EFFECT ON THE OPERATION OF THE CONTROL DEVICE, (G) A FLEXIBLE MOTOR ELEMENT OPERATIVELY CONNECTED TO THE VALVE MEMBERS, THE MOTOR ELEMENT BEING SUBJECTED TO THE PRESSURE AT THE FIRST OUTLET AND SUBSTANTIALLY BALANCED BY THE SAME PRESSURE ON THE FIRST VALVE MEMBER SO THAT THE PRESSURE AT THE FIRST OUTLET HAS NO EFFECT ON THE OPERATION OF THE CONTORL DEVICE, (H) MEANS EXERTING A PREDETERMINED PRESSURE ON SAID VALVE MEANS TENDING TO CLOSE THE FIRST VALVE PORT BY SAID FIRST VALVE MEMEBER AND TO OPEN THE SECOND VALVE PORT BY THE SECOND VALVE MEMBER UPON A DECREASE IN PRESSURE AT SAID SECOND OUTLET EXERTED ON SAID SECOND VALVE MEMNBER, AND TENDING TO OPEN THE FIRST VALVE PORT BY SAID FIRST VALVE MEMBER AND TO CLOSE THE SECOND VALVE PORT BY SAID SECOND VALVE MEMBER UPON AN INCREASE IN THE PRESSURE AT SAID SECOND OUTLET EXERTED ON SAID SECOND VALVE MEMBER.