Vacuum relief antibackflow and shut-off valve

Claim 2

A valve comprising: a. a valve body structure including a valve chamber, an inlet at the lower end thereof, a vent outlet at the upper end thereof in coaxial relation to the inlet, and a side outlet; b. a valve stem means extending through said vent outlet and axially movable in said valve chamber; c. a valve element secured to the lower end of the valve stem and movable thereby to open and close said inlet; d. a valve disc slidable on said valve stem for opening and closing said vent outlet; e. and a deflector mounted on said stem adjacent said valve element for directing liquid flowing upwardly around said valve element into a constricted path adjacent said stem thereby to impinge on said valve disc and drive said valve disc upwardly on said stem and close said vent outlet.

Claim 3

A valve, as defined in claim 1, wherein: a. said vent outlet has an annular inner seat and an annular outer seat; b. said valve disc includes an upwardly facing seating surface, a flat annular valve washer retained at its margins on said seating surface, and engageable with both of said vent outlet seats, said valve washer having perforations in the area between its regions of engagement with said vent outlet seats.

Claim 4

A valve, as defined in claim 1, wherein: a. said deflector includes upwardly converging conical walls having a major diameter greater than the diameter of said valve element; b. the under side of said valve disc forms a recess having upwardly converging conical walls of greater diameter than the conical walls of said deflector whereby liquid flowing upwardly from said deflector is redirected downwardly and outwardly from the under side of said valve disc.

Claim 5

The combination with a valve including a valve body structure having a valve chamber, an inlet at the lower end of the valve chamber bordered by an inlet seat, an annular vent outlet at The upper end of the valve chamber in coaxial relation with the inlet, said vent outlet being bordered by radially inner and radially outer vent valve seats, and a side outlet leading from the valve chamber; a valve stem means having a screw-threaded port extending through the output port, and an axially movable stem part; and a valve member carried by said part engageable with said inlet seat, of a vent outlet closing means comprising: a. a deflector member secured to said stem part contiguous to said valve member and including an annular upwardly converging wall the lower extremity of which projects radially beyond the valve member to capture water flowing upwardly around said valve member and redirect the water upwardly contiguous to the stem part; b. and a valve disc freely slidable on said stem part between a lower position contiguous to said deflector member and an upper position engaging said vent outlet seats whereby water issuing from said deflector member forcibly drives said valve disc to its upper position.

Claim 6

The combination with a valve including a valve body structure having a valve chamber, an inlet at the lower end of the valve chamber bordered by an inlet seat, an annular vent outlet at The upper end of the valve chamber in coaxial relation with the inlet, said vent outlet being bordered by radially inner and radially outer vent valve seats, and a side outlet leading from the valve chamber; a valve stem means having a screw-threaded port extending through the output port, and an axially movable stem part; and a valve member carried by said part engageable with said inlet seat, of a vent outlet closing means comprising: a. a deflector member secured to said stem part contiguous to said valve member and including an annular upwardly converging wall the lower extremity of which projects radially beyond the valve member to capture water flowing upwardly around said valve member and redirect the water upwardly contiguous to the stem part; b. and a valve disc freely slidable on said stem part between a lower position contiguous to said deflector member and an upper position engaging said vent outlet seats whereby water issuing from said deflector member forcibly drives said valve disc to its upper position.

Claim 7

a vent outlet closing means, as defined in claim 4, wherein: a. the upper side of said valve disc is covered by an annular valve washer disc sealingly retained thereon at its radially inner and radially outer margins, said valve washer disc having annular regions engageable by said vent outlet seats, and perforated between said regions to vent water accumulations from under said valve washer disc.

Claim 8

A vent outlet closing means, as defined in claim 4, wherein: a. the under side of said valve disc is provided with a redeflecting recess of larger area than said deflector member.