Heat pump delayed action coolant stop valve - has pressure switch to open valve and thus initiate coolant circulation period for attached compressor

摘要: The heat pump in a cooling cycle has compressor which continued to run after the valve coolant circulation closed. runs until pressure on its suction side is reduced approximately atmospheric. This increases efficiency of lubricant, by keeping from mixing with it. A relay provided hold closed for time when starts again power failure. switch pref. ensures that, opens initiate period circulation, begins before reaches it at high pressure. same switches off fallen