Hydrant purging means

Claim 2

In a hydrant: said hydrant having an inlet port and a discharge port with a fluid passageway therebetween; an air compression chamber in said hydrant adapted to be placed in communication with said fluid passageway; a first valve means in saiD inlet port controlling fluid communication between said fluid passageway and a source of water under pressure; a second valve means controlling fluid communication between said fluid passageway and said air compression chamber; a valve element on said first valve means controlling communication between the passageway and the outside of said hydrant, said valve element being normally open when said first valve means closes said inlet port; and said second valve means comprising a check valve element to permit the flow of air from said fluid passageway to said air compression chamber under the compressive action of the water flowing flowing through the inlet port, and a manual valve release element to overcome said check valve element to permit the release of air from said air compression chamber into said fluid passageway.

Claim 3

In a hydrant: said hydrant having an inlet port and a discharge port with a fluid passageway therebetween; an air compression chamber in said hydrant adapted to be placed in communication with said fluid passageway; a first valve means in said inlet port controlling fluid communication between said fluid passageway and a source of water under pressure; a second valve means controlling fluid communication between said fluid passageway and said air compression chamber; and a valve element on said first valve means controlling communication between the passageway and the outside of said hydrant, said valve element being normally open when said first valve means closes said inlet port; said second valve means comprising a check valve element to permit the flow of air from said fluid passageway to said air compression chamber under the compressive action of the water flowing through the inlet port; and means connected to said check valve element to permit the release of air from said air compression chamber into said fluid passageway to purge the fluid therefrom to the outside of said hydrant.

Claim 4

In a hydrant: said hydrant having an inlet port and a discharge port with a fluid passageway therebetween; an air compression chamber in said hydrant adapted to be placed in communication with said fluid passageway; a first valve means in said inlet port controlling fluid communication between said fluid passageway and a source of water under pressure; a second valve means controlling fluid communication between said fluid passageway and said air compression chamber; and a valve element on said first valve means controlling communication between the passageway and the outside of said hydrant, said valve element being normally open when said first valve means closes said inlet port; said second valve means comprising a check valve element to permit the flow of air from said fluid passageway to said air compression chamber under the compressive action of the water flowing through the inlet port; and means connected to said check valve element to permit the release of air from said air compression chamber into said fluid passageway to purge the fluid therefrom to the outside of said hydrant.

Claim 5

In a hydrant: said hydrant having an inlet port and a discharge port with a fluid passageway therebetween; an air compression chamber in said hydrant adapted to be placed in communication with said fluid passageway; a first valve means in said inlet port controlling fluid communication between said fluid passageway and a source of water under pressure; a second valve means controlling fluid communication between said fluid passageway and said air compression chamber; a valve element on said first valve means controlling communication between the passageway and the outside of said hydrant, said valve element being normally open when said first valve means closes said inlet port; and a hollow valve stem operatively connected to said first valve means and the valve element in said first valve means, said valve stem serving as a fluid passageway from said valve element to the outside of said hydrant at a point above ground level when said valve element is opened.

Claim 6

In a hydrant: said hydrant having an inlet port and a discharge port with a fluid passageway therebetween; an air compression chamber in said hydrant adapted to be placed in communication with said fluid passageway; a first valve means in said inlet port controlling fluid communication between said fluid passageway and a source of water under pressure; a second valve means controlling fluid communication between said fluid passageway and said air compression chamber; a valve element on said first valve means controlling communication between the passageway and the outside of said hydrant, said valve element being normally open when said first valve means closes said inlet port; and a hollow valve stem operatively connected to said first valve means and the valve element in said first valve means, said valve stem serving as a fluid passageway from said valve element to the outside of said hydrant at a point above ground level when said valve element is opened.

Claim 7

The hydrant of claim 3 wherein said hydrant includes means for moving said valve stem longitudinally to actuate said first valve means and said valve element.

Claim 8

The hydrant of claim 3 wherein said first valve means includes a closure element adapted to seat on said inlet port, and said valve element includes a closure means adapted to seal on the closure means of said first valve means and means on said hydrant for moving said valve stem longitudinally whereby movement in one direction will close said first valve means on said inlet port and will open said valve element, and movement in the opposite direction will close said valve element and will open said first valve means from said inlet port.