Frostproof hydrant seal

Details Frostproof hydrant seal Frostproof hydrant seal

F - Mech Eng,Light,Heat,Weapons

16

K

F16K 24/02 (2006.01) E03B 7/10 (2006.01) E03B 9/00 (2006.01) E03B 9/14 (2006.01) F16K 15/18 (2006.01)

Patent

CA 2222786

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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