| 摘要 |
<p>A switchover valve (20) is employed within a heat pump system (10) including a heat exchanger coil (14) within a structure (18) to be heated and cooled, and a second heat exchanger coil (16) external of the structure and in fluid communication with the first coil. The system also includes a compressor (12) which circulates a refrigerant between the coils to effect a net heat transfer into or out of the structure. The switchover valve operates to selectively reverse the flow of refrigerant between the coils, depending upon the operating mode of the system. The valve comprises a body (64) defining inlet and suction ports (22 & 28) for interconnection with the compressor and two reversing valve ports (36 & 40) for interconnection with the coils, a solenoid (196) operated pilot valve (153) and a slave valve (121) for selectively interconnecting the inlet port with one of the reversing valve ports, and a shuttle poppet valve (235) for interconnecting the suction port with the remaining reversing valve port.</p> |
