Frostproof hydrant seal

Details Frostproof hydrant seal Frostproof hydrant seal

1996-12-31

1998-04-21

Michalsky, Gerald A.

Fluid handling

Back flow prevention by vacuum breaking

Air vent in liquid flow line

137360, 1376142, E03C 110

Patent

active

057408319

ABSTRACT:
A sillcock which has freeze resistance, backflow contamination resistance and back pressure release from the downstream water, having a resilient, radially compressible and expandable back pressure seal valve which is also axially movable a controlled amount to thereby cover or uncover an inner vent hole between the water passage and a vent passage, to allow pressure release from the water flow passage to the atmosphere.

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