Heating and cooling plant

Claim 1

A THERMOSTATIC VALVE SYSTEM FOR THERMOSTATICALLY CONTROLLING AND REGULATING A HEATING FLOW AND A COOLING FLOW COMPRISING, A UNIT FOR CONTROLLING AND REGULATING HEATING AND COOLING FLOWS, SAID UNIT HAVING INLET MEANS AND OUTLET MEANS FOR INFLOW AND OUTFLOW OF A COOLING FLOW AND A HEATING FLOW, A PAIR OF ALTERNATELY OPERABLE VALVES COMPRISING A HEATING FLOW CONTROL VALVE AND A COOLING FLOW CONTROL VALVE IN SAID UNIT EACH OPERABLE TO AN OPEN AND A CLOSED CONDITION FOR RESPECTIVELY CONTROLLING FLOW OF SAID HEATING FLOW AND SAID COOLING FLOW THROUGH SAID INLET MEANS AND OUT OF SAID OUTLET MEANS, A THERMOSTATIC SYSTEM COMPRISING SENSING MEANS FOR SENSING TEMPERATURE VARIATIONS OF A TEMPERATURE TO BE CONTROLLED AND FOR CONTROLLING SAID VALVES IN DEPENDENCE UPON SAID TEMPERATURE BEING SENSED AND THE VARIATIONS THEREOF, VALVE OPERATING MEANS CONNECTED IN COMMON TO SAID SENSING MEANS AND RESPONSIVE TO SAID SENSING MEANS FOR OPERATING SAID VALVES INDEPENDENTLY AND ALTERNATELY IN DEPENDENCE UPON WHETHER SAID TEMPERATURE BEING SENSED IS ABOVE A GIVEN TEMPERATURE LEVEL OR BELOW SAID GIVEN TEMPERATURE LEVEL, SAID OPERATING MEANS COMPRISING EMANS FOR OPENING SAID COLD FLOW CONTROL VALVE WHEN SAID GIVEN TEMPERATURE LEVEL OF SAID TEMPERATURE BEIG SENSED IS EXCEEDED AND FOR CLOSING SAID COLD FLOW CONTROL VALVE WHEN SAID GIVEN TEMPERATURE LEVEL OBTAINS AND FOR MAINTAINING SAID COLD FLOW CONTROL VALVE CLOSED WHEN SAID TEMPERATURE BEING SENSED IS BELOW SAID GIVEN TEMPERATURE LEVEL, AND SAID VALVE OPERATING MEANS COMPRISING MEANS TO CLOSE SAID HEATING FLOW CONTROL VALVE WHEN SAID TEMPERATURE LEVEL OBTAINS AND IS EXCEEDED AND FOR OPENING THE LASTMENTIONED VALVE WHEN SAID TEMPERATURE BEING SENSED HAS A VALVE LESS THAN SAID TEMPERATURE LEVEL.