Patent ID: 11920694
Assignee: CALEFFI S.P.A.
Field: Control (Instruments)
Classification: CPC F  G | IPC F  G

Claim 0:
1. An antifreeze valve unit for pipes connected to air conditioning plants, the valve unit including;
a valve body provided with an inlet opening at one end for receiving an operating fluid from an air conditioning plant, an outlet opening at another end, and a conduit between said inlet and outlet openings for passage of the operating fluid within said valve body, said conduit containing a drain outlet;
a first thermostatic valve connected with said valve body, at said drain outlet, said first thermostatic valve including a valve outlet and being operable to drain the operating fluid as a function of the temperature of the operating fluid; and
a second thermostatic valve connected with said valve body coaxial with said first thermostatic valve, said second thermostatic valve including a shutter device operable to adjust opening and closing of said drain outlet to enable or prevent the drain of the operating fluid from said conduit into said first thermostatic valve as a function of the temperature of the external environment.