Fluid handling – Hydrant type – Protection against freezing
Reexamination Certificate
2006-05-10
2008-10-21
Lee, Kevin L (Department: 3753)
Fluid handling
Hydrant type
Protection against freezing
C137S305000, C137S883000, C137S614190
Reexamination Certificate
active
07438082
ABSTRACT:
The invention concerns a valve arrangement for external operation including: a feed opening, a delivery opening, a connecting passage which connects the feed opening to the delivery opening, a first valve which is adapted to enable the fluid connection through the connecting passage in a first functional position and to close same in a second functional position, and an actuating device for actuating the first valve. Valve arrangements of that kind suffer from the disadvantage that they are not suitable for frost-resistant operation as freezing water can damage parts of the valve arrangement. That disadvantage is overcome by the invention insofar as there is provided a second valve which is closed in the first and second functional position and which co-operates with a drain opening which is so connected to the connecting passage that in a third functional position in which the first valve is closed and the second valve is opened the liquid in the connecting passage can flow away through the drain opening. The first and the second valves can be in particular in the form of slide valves, in particular rotary slide valves and can preferably be integrated into a single slide valve.
REFERENCES:
patent: 377357 (1888-01-01), Hand
patent: 1863919 (1932-06-01), Brooks
patent: 2234635 (1941-03-01), Scott et al.
patent: 2819926 (1958-01-01), Wood
patent: 4109671 (1978-08-01), Hughes et al.
patent: 6532986 (2003-03-01), Dickey et al.
patent: 201 13 627 (2001-12-01), None
patent: 101 10 585 (2002-04-01), None
patent: 202 19 008 (2004-05-01), None
patent: WO 2004/094879 (2004-11-01), None
Interforge Klee GmbH
Lee Kevin L
Merchant & Gould P.C.
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