“Valve Automation Company”
Manufacturer of Valve Automation Products for Controlling Actuators, Pneumatic Cylinders and Pneumatic Control Valves. Valve Automation Solutions Provider for Critical Industrial Processes. Technical Manuals on I/P Transducers, Electro Pneumatic Positioners, Valve Positioners and Limit Switches. Contact for Valve Automation Company, USA.
Electro Pneumatic Positioners for Operation of Pneumatic Rotary, Linear Valve Actuators.
  Limit Switches
Series 300 / 301
(small) FC
Limit Switches
Series 400 FC
Limit Switches
Series 300 / 400 FC
I/P Transducers
Series 500FC
I/P Transducers
Series 600FC
  Electro-Pneumatic Positioners
Series 700FC
Valve Positioners
Series 800FC
  Smart Positioner 900FC
Download Electro-Pneumatic Series 700FC
  Electro-Pneumatic Positioners Series 703/704FC


The FLUCON 703/704 FC Series Electro - pneumatic positioners are used as final controlling element for operation of pneumatic Rotary/Linear valve actuators in correspondence with an input signal of 4-20 mA DC or split ranges.

The Positioners are based on a force balance design for control application that requires a high degree of reliability and repeatability at an economical cost.

The Positioners can handle the supply pressure up to 100 psig for higher pressure industrial pneumatic and process control system requirements.

Series 703 FC Electro Pneumatic Positioner.
  Integrated Characteristics
Suitable for Rotary / Linear Actuators.
Low Air Consumption.

No resonance at 5~200Hz.

Prevents hunting by using Orifice for small size actuator.
Simple Conversion to Direct Acting or Reverse Acting.
Precise Calibration with simple SPAN and Zero Adjustments.
Suitable for Single/Double acting Actuators.
Can control split range with simple operation without replacing any parts.
Extremely Vibration Resistance Design.
Easy Maintenance.
Corrosion-Resistance Aluminium Diecast Body.
Options available:
  Position Transmitter (4-20mA DC).
  Two Limit Switches.

The Flucon 703/704FC Positioners converts pneumatic/electrical signal to a pneumatic output which can be used to operate the following:

Valve, Valve-Actuators
Damper and Louver Actuators
Web Tensioners and Brakes
    Used in:
Petrochemical Processing Systems, Energy Management HVAC Systems, Textile Processing Systems, Phamraceutical Processing System, Paper & Pulp Handling Controls.

  Principle of Operation


The operation of FLUCON 703/704 FC Series E/P Positioners are based on a force balanced system. Tension on the feedback spring provides feedback to the positioner which will vary as the actuator shaft rotates with cam. The spring loading force is applied through the cam shaft S cam to the positioner's instrument signal capsule through the balance beam.

Input of 4~20mA DC is applied to the instrument and corresponding output is applied to the control capsule serving as force balance membrane and matching the actuator shaft position to the instrument signal.

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  Download Electro-Pneumatic Series 700FC