Fire hydrant with second valve
AssigneeDavidson Hydrant Technologies, Inc.
InventorThomas Dewey Davidson
Life of this patent
Estimating the term…
Abstract
Fire hydrants which feature additional structure for reducing the potential that those with ill intent can foul municipal water supplies by introducing toxins or other materials into fire hydrants. Various embodiments include valves which close off portions of the hydrant otherwise available for receipt of toxic or other materials when the fire hydrant nozzle cap is unscrewed and open. Such valves preferably open, manually or automatically, when water is flowing from the water supply through the nozzle, a condition which renders it difficult at best to introduce toxins through the hydrant into a water supply, but close off portions of the barrel when the nozzle is open and water is not flowing through the nozzle.
Claims22
A fire hydrant, comprising:
- a. a barrel adapted to communicate at least indirectly with a water conduit;
- b. a nozzle extending from the barrel and communicating with the barrel;
- c. a hydrant valve adapted to controllably restrict communication between the barrel and the water conduit;
- d. a valve actuator adapted to allow actuation of the hydrant valve, said actuator comprising an actuator rod;
- e. a cap structure adapted to at least close off the end of the barrel not in communication with the water conduit;
- and
- f. a second valve for deterring the introduction of toxins into the water conduit, said second valve disposed between the hydrant valve and the nozzle, comprising:
- (i) a seat disposed below the bottom of the nozzle;
- (ii) a restriction member adapted to cooperate with the seat to close off communication between portions of the barrel above the second valve and portions of the barrel below the second valve when the nozzle is open and water is not flowing through the nozzle, wherein a portion of the restriction member receives the actuator rod;
- and
- (iii) biasing structure adapted to bias the restriction member against the seat so that water from the conduit flows through the nozzle only when the hydrant valve is at least partially open and the nozzle is at least partially open and for regulating the opening of the restriction member.
A fire hydrant, comprising:
- a. a barrel adapted to communicate with a water conduit;
- b. a nozzle extending from the barrel and communicating with the barrel;
- c. a hydrant valve adapted to controllably restrict communication between the barrel and the water conduit;
- d. a valve actuator adapted to allow actuation of the hydrant valve, said actuator comprising an actuator rod;
- e. a cap structure adapted to at least close off the end of the barrel not in communication with the water conduit;
- and
- f. a second valve for deterring the introduction of toxins into the water conduit;
- the second valve disposed between the hydrant valve and the nozzle and adapted to be closed when the hydrant valve is closed, but to permit flow of water when the hydrant valve is at least partially open and the nozzle is at least partially open, wherein a portion of the second valve receives the actuator rod, wherein a seat for the second valve is disposed below the bottom of the nozzle, and wherein the flow of water from the conduit through the barrel regulates the opening of the second valve to permit the flow of water through the nozzle.
A fire hydrant, comprising:
- a. a barrel adapted to communicate with a water conduit;
- b. a nozzle extending from the barrel and communicating with the barrel;
- c. a hydrant valve adapted to controllably restrict communication between the barrel and the water conduit;
- d. a valve actuator adapted to allow actuation of the hydrant valve, said actuator comprising an actuator rod;
- e. a cap structure adapted to at least close off the end of the barrel not in communication with the water conduit;
- and
- f. a second valve for deterring the introduction of toxins into the water conduit, the second valve disposed between the hydrant valve and the nozzle and adapted to be closed when the hydrant valve is closed and open when the hydrant valve is open, wherein a portion of the second valve receives the actuator rod, wherein a seat for the second valve is disposed below the bottom of the nozzle, and wherein the flow of water from the conduit through the barrel regulates the opening of the second valve to permit the flow of water through the nozzle.
Dependencies are inferred from the claim text.