Patent ID: 7051761

Claim:
A fill and bleed valve for filling a liquid circulating system, comprising, a valve body having an axial central bore with a closed end and an open end, a system inlet port and system outlet port opening into said valve body central bore at discrete locations between and axially spaced from said bore closed end and open end, a fill inlet port opening into said central bore at a discrete location axially between said bore open end and said system inlet port, a fill outlet port opening into said central bore at a discrete location axially between said bore closed end and said system outlet port a plunger axially movable within said central bore, accessible from said bore open end, and having a close fitting inner disk located respective to said bore closed end and a close fitting outer disk located respective said disk open end, said inner and outer disks being located relative to one another and relative to said system inlet and outlet ports such that, in an axially inserted, normal operating position, the inner disk seals the system outlet port and fill outlet port from one another and also seals the system inlet port and fill inlet port from one another, while concurrently opening the system inlet and outlet ports to one another, while in an axially retracted, filling position, the inner disk seals the system inlet and outlet ports from one another and concurrently opens the fill outlet port and system outlet port to one another, while the outer disk seals the open end of the bore and concurrently opens the fill inlet port and system inlet port to one another, whereby the axial insertion and retraction of the plunger alone and the axially movable inner and outer disks in the single central valve body bore accommodate both the system filling operation and normal system operation.