Valves and valve actuation – Heat or buoyancy motor actuated
Patent
1978-11-01
1981-03-31
Schwadron, Martin P.
Valves and valve actuation
Heat or buoyancy motor actuated
60531, 236 68R, F16K 3102, F03G 706
Patent
active
042588995
ABSTRACT:
The invention relates to a valve assembly. A closure member for the valve unit is controlled directly or indirectly by a movable wall of an expansible chamber filled with a refrigerant medium having vapor and liquid phases. The pressure exerted by the vapor phase of the medium provides a bias which is directly related to the temperature of the liquid phase. A heat transfer element such as a heating resistor in the liquid phase is heated or allowed to cool in a controlled manner by an external control unit. A temperature responsive sensor element in the liquid phase of the medium is part of a feedback system for the control unit which allows a selected temperature to be maintained in the chamber which results in a desired constant pressure to be maintained in the chamber. A pilot valve unit is disposed between the valve closure member and the movable wall. An expansible chamber behind the closure member houses a spring for biasing in a valve closing direction. A bypass throttle passage has a first section extending from the valve inlet to the expansible chamber and a second section extending from the expansible chamber to the valve outlet. The pilot valve unit includes a valve element operably connected to the movable wall for controlling fluid flow through the second bypass section and thus control the opening of the valve closure element.
REFERENCES:
patent: 1711403 (1929-04-01), Boger
patent: 1905683 (1933-04-01), Carraway
patent: 3168805 (1965-02-01), Fleury
patent: 3500634 (1970-03-01), Waseleski, Jr. et al.
patent: 3709460 (1973-01-01), McIntoch
patent: 4016722 (1977-04-01), Niederer, Sr.
Huelle Zbigniew R.
Nielsen Leif
Danfoss A/S
Easton Wayne B.
Schwadron Martin P.
Walton G. L.
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