Electro Pneumatic Positioner, Pneumatic Valves, Directional Control Valve, Hydro Pneumatic Control, Mumbai, India  

Electro Pneumatic Positioner

Electro Pneumatic Positioner


Electro Pneumatic Positioner

Application :-

Electro pneumatic is used for controlling movement of final control element such as Linear Cylinder, Diaphragm Control valve or Rotary actuator device which accept directly variable electronic signal & E/P positioner is a precision with the help of auxiliary high pressure supply accurately controls movement of final control element corresponding to set point.
Common unit for all type of actuators.
Simple calibration using three keys & LCD display
Auto start function with self adjustment of zero & span
Selectable freeiy programmable characteristic
Minium air consumption
Tight shut off function
Minium linkages to give error free feed back
No air consumption under balance condition hence saving of energy
Action field reversible
Digital output indicating precise position during operation
Unit can be modified for use with electrical actuator
Construction :-
Usually available in MS powder coated housing suitable for panel mounting with solenoid provided in separate weather proof housing & linear pot for field mounting. However optionally for field mounting with built in solenoid with die cased aluminium weather proof housing can be provided at extra cost.

Operating System
Positioner receives mainly three inputs such as :
• 230 V a. c. 50 C/s, power supply
• 4-20 MA-Input signal ( Control )
• Potentiomter - Output ( Feedback )
The microprocessor based instrument amplifier of the positioner receives variable input control signal & potentiometer output feedback signal. Microprocessor compares these values & depending upon vectorial difference decides & fires the corresponding relay which in turn triggers solenoid to admit & exhaust air from actuator. The system is based on modulation of signal & its time function. The microprocessor precisely calculates the time function & accurately positions. The movement of actuator standard instrument available with input control signal of 4-20 MA. However system can be modified for accepting other variable depending upon specific requirement. Similarly normal characteristic is linear, however optionally other characteristics such as equal percentage or square-root extraction is available
• Simple installation & largely automatic commissioning.
• No effect of temperature or pressure variation.
• Maintenance free operation
• Calibration can be changed with display & key board.
• EP - Postioner-I
• EP - Postioner-II
• EP - Postioner - III
EPP-I / EPP-II / EPP-III, Panel / Field
4-20 mA / 0-1 V dc / 0-10 V dc / 0-20 mA dc Single / Double acting
Stroke of cylinder / Stroke of control valve or
900 rotary actuator


1. I to P converter not required hence saving in cost
2. Reduced linkages hence maintenance free
3. "Can be remotely mounted
4. Calibration: is easy hence saving in time 5 Digital output of feedback position
6. Remote indication possible
7. Reduced air consumption hence saving of energy


Linear cylinder
Rotary actuator
PN diaphragm control valve



• Type of positioner
• Type of mounting
• Type of input signal
• Type of actuator
• Stroke length
• Any optional extra feature
• Mounting: Pane! Mounted I Field mounted.


1. Product is processed & manufactured under technical guidance ofSMD Technologies - USA.
2. International Patent - Applied for,
3. Due to continuous research & development we reserve right for change of specification & upgradation