Thermal expansion relief valve

Details Thermal expansion relief valve Thermal expansion relief valve

1995-01-06

1996-09-03

Michalsky, Gerald A.

Fluid handling

Back flow prevention by vacuum breaking

Air vent in liquid flow line

137 59, 137539, 137879, 137881, F16K 2402

Patent

active

055514731

ABSTRACT:
A fluid flow control valve, e.g. a pressure vacuum breaker, includes a thermal expansion relief valve for protecting the control valve against damage due to freezing. The control valve has a valve body of rigid material and defines a main conduit. The thermal expansion relief valve has a relief valve body mounted to the main valve and defines a relief conduit in fluid communication with the main conduit, a valve element the moves within the relief conduit between a first sealing position in engagement with a valve seat to resist flow and a second position spaced from the valve seat to allow flow from the main conduit through the relief conduit, and a spring urging the valve element toward sealing position with a predetermined force selected to exceed normal operating pressure of the main valve and to lie below pressure damaging to the main valve. A thermal expansion valve for protecting fluid flow control valves, e.g. by retrofit, is also described.

REFERENCES:
patent: 2960996 (1960-11-01), Haselton
patent: 2997054 (1961-08-01), Woodford
patent: 3952770 (1976-04-01), Botnick
patent: 4117856 (1978-10-01), Carlson
patent: 4182356 (1980-01-01), Woodford
patent: 4286616 (1981-09-01), Botnick
patent: 4506694 (1985-03-01), Daghe et al.
patent: 4909270 (1990-03-01), Enterante, Sr. et al.
patent: 5299592 (1994-04-01), Swanson
patent: 5404904 (1995-04-01), Glaser
Watts Regulator Brochure, "Watts 800M Pressure Vacuum Breakers", S-800, undated.
Watts Regulator Brochure, "800M4 Pressure Vacuum Breakers", S-800M4, undated.
Watts Regulator Brochure, "Series 800M3-QT/800M2-QT Anti-Siphon Pressure Vacuum Breakers", undated.
Watts Regulator Brochure, "Series 800M4-QT Anti-Siphon Pressure Vacuum Breakers", undated.

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