Antifreeze valve unit
AssigneeCaleffi S.p.A.
InventorMarco Caleffi
Life of this patent
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Abstract
An antifreeze valve unit has a valve body provided with at least one opening for the delivery of a fluid used in an air conditioning plant; this unit has a first thermostatic valve, fitted at a drain outlet to drain the fluid in function of the fluid temperature, and a second thermostatic valve fitted at the drain outlet to enable or prevent the drain of the fluid in function of the external environment temperature. This antifreeze valve unit operates reliably in any temperature condition of the inner fluid and of the external environment temperature, and enables the plant to be drained only if a real possibility of fluid freezing occurs.
Claims13
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.
Dependencies are inferred from the claim text.