Pneumatic actuator movement indicator

Details Pneumatic actuator movement indicator Pneumatic actuator movement indicator

2008-06-17

2008-06-17

Smith, R. A. (Department: 2841)

Signals and indicators

Indicators

Fluid flow

C116S268000, C137S557000

Reexamination Certificate

active

07387080

ABSTRACT:
Disclosed is a pneumatic actuator movement indicator comprising a housing adapted to be connected in series between a pneumatic actuator and a source of pressurized fluid for the actuator, and an indicator located in, and having an equilibrium position in, the housing. The housing includes a first chamber for placing the housing in fluid communication with said actuator at a pressure P1, and a second chamber for placing the housing in fluid communication with said source of pressurized fluid at a pressure P2. The indicator is movable in the housing in response to a difference between P1and P2. Movement of the pneumatic actuator produces a difference between P1and P2; and in response to this difference, the indicator moves away from its equilibrium position, indicating the movement of the pneumatic actuator.

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