Motors: expansible chamber type – Working member position feedback to motive fluid control – Bias-type input and feedback signal means
Patent
1981-11-16
1988-01-26
Garrett, Robert E.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Bias-type input and feedback signal means
91417R, 91444, 91461, F15B 1517
Patent
active
047210273
ABSTRACT:
An actuator for moving a valve or other controlled part in correspondence with variations in an input signal and including a piston movable in opposite directions within a cylinder and having a smaller effective area exposed to fluid in a first chamber at one side of the piston than to fluid in a second chamber at the opposite side of the piston, a pressure fluid source delivering pressurized fluid to the first of these chambers and delivering pressurized fluid to the second chamber through a three way valve having a body containing inlet and outlet openings and a valve element movable relative thereto in a manner varying the pressure delivered to the second chamber of the cylinder. A control element downstream of the three way valve is actuable by variations in an input signal to correspondingly vary the discharge of fluid which flows through the specified outlet opening in the three way valve body, and an automatic mechanism responsive to variations in pressure between that outlet opening in the three way valve body and the control element moves the valve element of the three way valve in correspondence with the changes in pressure. A feedback mechanism between the piston and the control element balances the forces actuating that element in a predetermined desired setting of the piston.
REFERENCES:
patent: 2866476 (1958-12-01), Orloff
patent: 3455209 (1969-07-01), Preston et al.
patent: 3521535 (1970-07-01), Oelrich
patent: 3675538 (1972-07-01), Keller et al.
patent: 4117765 (1978-10-01), Paduch et al.
patent: 4173984 (1979-11-01), Solomon
Keller William F.
Sibley Richard D.
Garrett Robert E.
Green William P.
Koso International, Inc.
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