Motors: expansible chamber type – With motive fluid valve – Pilot valve
Patent
1965-04-16
1976-04-06
Feinberg, Samuel
Motors: expansible chamber type
With motive fluid valve
Pilot valve
91 49, F15B 1108
Patent
active
039481484
ABSTRACT:
1. A device for controlling a pneumatic actuator comprising a working piston, a working chamber in which a pressure varying as a function of the effort to be exerted by said working piston is to be produced, a body, a cylindrical bore formed in said body, a regulating piston slidably fitted in said cylindrical bore, a rod rigid with said piston which emerges from said bore, an adjustment chamber and an amplifying chamber formed in said cylindrical bore on either side of said regulating piston, said adjustment chamber communicating with said working chamber, an inlet chamber formed in said body, a source of compressed gas delivering said gas under a constant pressure, said source being connected permanently to said inlet chamber, a first orifice connecting said inlet chamber to said adjustment chamber, a valve member carried by the rod of said regulating piston and closing said first orifice, another orifice of relatively small cross-sectional area connecting said amplifying chamber to said source of compressed gas, a third orifice having a greater cross-sectional area than said second orifice which connects said amplifying chamber to the surrounding atmosphere, a valve member adapted to obturate said third orifice and a control device acting upon said valve member in order to vary the free cross-sectional passage area of said third outlet orifice and to adjust in proportion thereto the pressure prevailing in said amplifying chamber and, therefore, the pressure in said adjustment chamber and in the working chamber of said pneumatic actuator.
REFERENCES:
patent: 3234857 (1966-02-01), Castelet
Adams Bruce L.
Burns Robert E.
Etat Francais
Feinberg Samuel
Lobato Emmanuel J.
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