Fluid handling – Hydrant type – With pump or ejector
Patent
1976-11-29
1978-09-12
Schwadron, Martin P.
Fluid handling
Hydrant type
With pump or ejector
137305, 251 54, E03B 914
Patent
active
041129660
ABSTRACT:
A hydrant for controlling the flow of water from an underground supply includes a casing connected at its lower end to the supply and its upper end to a nozzle for delivery of water from the casing. The flow of water from the supply to the casing is controlled by a main valve operated by a handle on the hydrant casing. An ejector purge apparatus drains the casing after the flow of water through the casing has been terminated by the main valve in order to prevent frost damage. The ejector purge apparatus includes a purge valve controlling flow from the supply through a conduit to a location outside of the hydrant casing. The conduit includes a flow constricting element and a port adjacent the flow constricting element that is in fluid communication with the casing. Flow through the purge valve and the flow constricting element results in venturi evacuation of the water within the casing. The purge valve is maintained in an open position for a limited time by a motion dampening dash pot after closure of the main valve to allow complete evacuation.
REFERENCES:
patent: 2481909 (1949-09-01), Dales et al.
patent: 2635621 (1953-04-01), Hansen
patent: 2665710 (1954-01-01), McGarry et al.
Gerard Richard
Mark Controls Corporation
Schwadron Martin P.
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