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53.40-53.57
Choose a version from the table underneath, please.
Description:
The pneumatic proportional valve translates an electrical command
signal into a proportional pneumatic outlet signal
(I/P or E/P converter). The transducer works on the flapper-nozzle
principle. The electrical command signal generates a magnetic field
in the coil. At the lower end of the coil there is a flapper valve
which operates against a precision ground nozzle to create back
pressure on the control diaphragm of a booster relay. The current
flowing through the coil produces a force which proportionately
controls the nozzle back pressure.
This control pressure is applied to a servo mechanism which operates
the high flow inlet and exhaust valves. An integral volume booster
provides excellent flow capacity to give fast response in the majority
of applications, including dead end service.
Two-wire_system:
For the two-wire system no additional supply voltage is necessary.
The current consumption is 20 mA in the 1 bar range and 60 mA in the
8 bar range.
Also available with declining characteristic curve.
Three-wire_system:
Additional supply voltage of 12 to 28 V necessary for the amplifier.
Thereby the signal input is high-impedance (10 kΩ).
The current consumption is only 1 mA at 10 V.
ATEX_version: intrinsically safe according to Atex II 1 G Ex ia IIC T4
Mounting_position: upright, protection against vibration is necessary
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