Fluid handling – Pressure modulating relays or followers – With counter-balancing pressure feedback to the modulating...
Patent
1995-06-20
1997-01-07
Nguyen, Hoang
Fluid handling
Pressure modulating relays or followers
With counter-balancing pressure feedback to the modulating...
25112909, 91387, F15B 500, F15B 1316
Patent
active
055906770
ABSTRACT:
An electropneumatic positioner includes an electropneumatic converter, an pilot relay, an operating unit, and a sensor. The electropneumatic converter includes a yoke having central and side leg portions, a permanent magnet arranged on the central leg portion, a pair of coils for exciting the side leg portions to have opposite polarities, a nozzle embedded in one side leg portion to spray air having predetermined pressure, a stopper arranged on the other side leg portion, and a flapper arranged to be swingable on a fulcrum near the central leg portion and serving to change a nozzle back pressure by controlling the amount of air sprayed from the nozzle in accordance with a swing. The electropneumatic converter receives a duty signal, as a driving signal for the coils, which signal is obtained by converting a deviation between an input signal and a feedback signal into a duty. The flapper is set to be parallel to the yoke when the deviation between the input signal and the feedback signal is zero. The pilot relay receives a nozzle back pressure and amplifies an air pressure. The operating unit converts an output air pressure from the pilot relay into a mechanical displacement amount. The sensor detects the displacement amount obtained by the operating unit and generates a feedback signal.
REFERENCES:
patent: 3106094 (1963-10-01), Gallo
patent: 3771541 (1973-11-01), Abbott
patent: 4336819 (1982-06-01), Nishihara
patent: 4545353 (1985-10-01), Gmelin et al.
Nguyen Hoang
Yamatake-Honeywell Co. Ltd.
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