Two stage pneumatic servo valve

Details Two stage pneumatic servo valve Two stage pneumatic servo valve

F - Mech Eng,Light,Heat,Weapons

15

B

137/95

F15B 13/02 (2006.01) F15B 9/16 (2006.01) F16K 11/00 (2006.01)

Patent

CA 1133355

ABSTRACT OF THE DISCLOSURE A two-stage pneumatic servovalve assembly for controlling an output motor is disclosed. An input device, such as a torque motor, is coupled to the two-stage servovalve assembly. The first stage of the servovalve assembly includes a vane valve movable by the output of the torque motor to selectively provide a fluid path from an input source to one of the first-stage output channels. The first-stage pneumatic servovalve is coupled with a second stage servovalve. The second stage servovalve controls fluid flow from a pneumatic fluid source to an output motor. The second stage servovalve includes a slidable spool valve movable by fluid received from the first-stage servovalve. A feedback control from the second-stage servovalve to the first-stage servovalve is provided. A second feedback control is provided from the output of the output motor to the first stage servovalve.

363951

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