Screw stopper including anti-freeze device used for water pipe v

Details Screw stopper including anti-freeze device used for water pipe v Screw stopper including anti-freeze device used for water pipe v

1989-02-16

1990-06-12

Walton, George L.

Fluid handling

Freeze condition responsive safety systems

Low temperature responsive drains

60527, 116218, 137468, 236101D, 237 80, 251 11, F16K 3164, E03B 712

Patent

active

049324292

ABSTRACT:
This invention relates to a screw stopper including an anti-freeze device used for water pipe valve and fitted to the lower end portion of an open/close movable valve of said water pipe valve comprises: a small perforation penetrated centrally on the lower portion of the said screw stopper; a water-through recess formed on a countersink portion of the said screw stopper; a small movable member including a small valve for opening and closing an aperture of the said small perforation, and said small movable member partially defining an water-through passage; a pair of springs for holding said small movable member, at least of which is made of shape-memory alloy; an outer cylinder for holding said pair of springs screwed and fitted to the said screw stopper; and a packing for sealing up water by a valve seat.

REFERENCES:
patent: 1067409 (1913-07-01), Daniel
patent: 1134882 (1915-04-01), Lowe
patent: 3403238 (1968-09-01), Buehler et al.
patent: 4066090 (1978-01-01), Nakajima et al.
patent: 4344450 (1982-08-01), Walters
patent: 4522219 (1985-06-01), Ohkata
patent: 4523605 (1985-06-01), Ohkata
patent: 4638828 (1987-01-01), Barrineau, Sr. et al.

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