Single annular membrane type of pneumatic positioner

Details Single annular membrane type of pneumatic positioner Single annular membrane type of pneumatic positioner

1980-06-02

1983-02-22

Maslousky, Paul E.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Bias-type input and feedback signal means

13762566, F15B 1316

Patent

active

043744850

ABSTRACT:
Single annular membrane type of pneumatic positioner associated with a servo control comprising a cylinder-piston assembly, feedback connected to the positioner, which includes a hollow body, internally of which there is provided at one side a reverse feedback spring controlled by the servo control, and at the other side a slide or distributing valve is provided, the inner cavity of the pneumatic positioner being separated by a single annular membrane, capable of being displaced under the action of an adjusting signal, said annular membrane being provided at the center with a hole through which a stem of the slide or distributing valve frictionessly slides, which stem bears against a dish-like member resting on the reverse feedback spring, while at the opposite side the slide or distributing valve bears on a low load spring.

REFERENCES:
patent: 2225321 (1940-12-01), Schwendner
patent: 2934305 (1960-04-01), Farris et al.
patent: 2937655 (1960-05-01), Vana
patent: 2966891 (1961-01-01), Williams
patent: 3172336 (1965-03-01), Warstler

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