Switching valve and an electro-pneumatic pressure converter util

Details Switching valve and an electro-pneumatic pressure converter util Switching valve and an electro-pneumatic pressure converter util

1985-07-18

1986-10-21

Michalsky, Gerald A.

Fluid handling

Pressure modulating relays or followers

With counter-balancing pressure feedback to the modulating...

13759617, 13762565, 25112906, F16K 3102

Patent

active

046179526

ABSTRACT:
A switching valve has at least one plate-shaped piezo-electric element having a free end which is supported in a sealed chamber, at least two fluid directing nozzles arranged to be opened or closed due to the position of the free end of the piezo-electric element and a fluid output passage communicating outwardly from said sealed chamber. An electric-pressure converter uses the switching valve, a pilot relay for converting a fluid pressure signal delivered from the output passage into a standard air pressure signal, a pressure sensor for converting the pressure signal from said pilot relay into an electrical signal, pulse-width modulating means for providing a pulse-width modulated signal, which corresponds to the deviation between the electrical signal from the pressure sensor and an external reference electric signal, for energizing the plate-shaped piezo-electric element in the switching valve.

REFERENCES:
patent: 2928409 (1960-03-01), Johnson et al.
patent: 4340083 (1982-07-01), Cummins
patent: 4492360 (1985-01-01), Lee et al.
patent: 4535810 (1985-08-01), Duder et al.

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