Motors: expansible chamber type – With motive fluid valve – Pilot valve
Patent
1987-08-18
1988-11-15
Hershkovitz, Abraham
Motors: expansible chamber type
With motive fluid valve
Pilot valve
92 43, 92 79, 92 87, F15B 1108, F15B 2104
Patent
active
047840404
ABSTRACT:
A control system for a pneumatic actuator uses pressurized gases, such as air, as the actuating medium. Such gases and particularly air commonly contain moisture which condenses to form a liquid, such as water, which collects in a closed chamber of an expandable chamber assembly in the pneumatic actuator. In cold climates, the water freezes, preventing proper control of the pneumatic actuator. By providing a control system having a valve positioned elevationally higher or in close proximity to a pneumatic actuator and a tube which extends into the closed chamber of the expandable chamber assembly, water which is contained in the closed chamber is expelled from the elevationally lowest portion of the assembly when the valve is shifted to exhaust the air from the control system.
REFERENCES:
patent: 2973133 (1961-02-01), Newton
patent: 3361037 (1968-01-01), Likavec
patent: 4006329 (1977-02-01), Hellman
patent: 4016936 (1977-04-01), Easterling
patent: 4227444 (1980-10-01), Lincicome
Oswald Charles W.
Stanley James M.
Caterpillar Inc.
Glastetter Calvin E.
Hershkovitz Abraham
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