Overview

Positional control or proportional valve positioning systems are available using either a pneumatic impulse signal (e.g. 0.2 to 1 Barg) or an electrical signal (normally 4 to 20 mA). These systems are designed either to have customer defined pre-set positions or to have full control of the valve between the open and closed positions. Valve positioning systems can be used in conjunction with on/off production or ESD controls and can be utilised for a partial test system e.g. using digital controllers. PLC controllers can also be incorporated to provide complete automatic valve positioning control via input from pressure transmitters.

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Applications

Precise positioning of quarter-turn and linear valves.

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Operating Ranges

Electrical Supply (VAC)

• 380/440V – 3 Phase – 50/60 Cycles
• 110/240V – Single Phase 50/60 Cycles

Electrical Supply (VDC)

• 24VDC 50W or 100W

Communications

• Command signal: 4-20mA
• Re-transmission Signal: 4-20mA
• Protocol: 4-20mA HART or Foundation Fieldbus

Accuracy

• Positional: Better than ±0.5%
• Repeatability: Better than ±0.5%

Temperatures

• Low: -60 to +60°C  (-76 to +140°F)
• Standard: -20 to +60°C  (-4 to +140°F)

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Key Features & Benefits

• The same simplicity and low cost of installation as provided by electric actuators
• Fail safe or fail last operation
• The power, precision and compact size of high pressure hydraulic systems
• Industry-leading  control options  and system diagnostics
• Zero emissions
• Environmentally responsible via low power, solar powered and biodegradable fluid options

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Additional Resources

• Product Brochure
• Datasheets
  • Standard System
  • Compact System
• Presentation
• Service Manuals
  • EXD200 EX200 Compact Exd Electro-Hydraulic Position & Monitoring System
  • EX200-HART Compact Electronic Actuator Positioner
  • EHPC210 Actuator Controller