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Fairchild Electro-Pneumatic Transducers
Voice Coil Technologies
This is the earliest type of control technology. In voice coil systems, a flapper nozzle is attached to a voice coil that is immersed in a magnetic field. The strength of an electronic signal to the coil moves the coil into or out of the magnetic field. This movement causes a flapper nozzle to open or partially close on a orifice and change the regulated output.
Piezo-ceramic Technology
This technology is relatively new to I/P and E/P control. A piezo electric ceramic disk covers an orifice. An electronic signal to the disk causes a deflection that opens or partially closes the orifice. Internal electronic feedback assures precise output pressure control. This technology is extremely resistant to shock, vibration, and changes in position.
Feed and Bleed Technology
This is the latest type of technology. This system uses microprocessor controlled electro-pneumatic solenoid valves to feed supply pressure to the regulated output and bleed excess pressure to atmosphere. Analog or digital input control signals control the solenoids that monitor and maintain the regulated output. This technology is extremely resistant to shock and vibration.
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