Four position control valve for a pneumatically operated servomo

Details Four position control valve for a pneumatically operated servomo Four position control valve for a pneumatically operated servomo

1983-05-06

1984-12-11

Maslousky, Paul E.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

91376R, F15B 910

Patent

active

044871058

ABSTRACT:
A retainer 226 for holding a control valve 656 of a servomotor 42 in a bore 90 of a hub 78. The hub 78 which is attached to a movable wall 56 has first 92 and second 96 passages that connect the bore to first 86 and second 88 chambers in the servomotor 42. The retainer 226 limits the movement of the control valve 656 in the bore 90 to establish a full release position whereby the pressure of the fluid in the first 86 and second 88 chambers equalize. In response to an input force, the control valve 656 moves to an actuation position where fluid under pressure is communicated to the second chamber 88 to create a pressure differential across the movable wall 56. The pressure differential acts on the movable wall 56 to develop an output force corresponding to the input force. On termination of the input force, the control valve 656 moves to the full release position where the fluid pressure equalization occurs. As equalization occurs, the retainer 226 cooperates with the hub 78 to allow the control valve 656 to move from the full release position to a fixed rest position adjacent the actuation position to reduce the valve travel required to reach the actuation position when an input force is applied to the control valve 656.

REFERENCES:
patent: 3452646 (1969-07-01), Abbott et al.
patent: 4358990 (1982-11-01), Takeuchi

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