Regulating valve for water mixing in air conditioning systems

Claim 1

A regulating valve for mixing water in an air-conditioning system said valve comprising a main body having a longitudinal recess, a stem accommodated and movable within said recess, one end of said stem projecting from said main body, a cap secured to said stem, said cap having a free surface, a resilient baffle positioned in in opposition to the free surface of said cap for defining a closed chamber therebetween, said chamber being in communication with a supply conduit for pressurized air, a lower plug and an upper plug sealingly a nd slidably mounted on said stem, said plugs being movable within said longitudinal recess, resilient means for urging each of said plugs, at the valve inoperative position, to a location where it will interconnect two holes in said main body member and the opening defined by said longitudinal recess, a piston positioned between said two plugs, said piston being coupled to said stem and sealingly movable within said longitudinal recess, said main body member including two additional holes, one of which is above said upper plug, a member secured to said stem, said member being spaced apart relative to said supper plug and adapted to interfere therewith whereby pressurized air admitted into said chamber first causes said lower plug to be lowered to provide temporary connection between the holes adjacent thereto and then causes said upper plug to be lowered to provide temporary connection between all of the holes adjacent thereto.