IMI STI PT Series SR/CCK Valve Positioner Double Single Acting for Butterfly Plug Ball Valves

The IMI STI PT Series SR/CCK Valve Positioner is a heavy-duty pneumatic and electro-pneumatic positioning solution engineered for proportional quarter-turn operation of industrial valves. Built on the balanced-forces principle, it amplifies pneumatic signals to eliminate actuator drag and boost response speed, while accurately determining actuator position via linear or non-linear control signal functions. Designed for seamless integration between air filter regulators and final control element actuators, this positioner supports both single and double-acting rotary actuators, and linear actuators with a specific bracket. Its robust construction delivers reliable performance in harsh industrial environments, making it a core control component for pneumatic valve sets across process automation sectors.

• Heavy duty design for extreme and hazardous working conditions
• Configurable as single or double acting for flexible actuator compatibility
• Equipped with linear cams up to 270° angle, custom cam profiles available on request
• Cam operating angles and range adjustments clearly marked on the unit
• Amplifies pneumatic signals to reduce actuator drag and improve response speed
• Split range signal spool valve for diverse control signal requirements
• Integrated visual position indicator for real-time operational monitoring
• Full stainless steel construction option for enhanced corrosion resistance
• High positioning accuracy with low hysteresis and excellent linearity
• Suitable for outdoor installation, offshore, sandstorm and copper-free ambient conditions
• Single control signal enables functional sequence checking of multiple actuators

• Input Signal: 3-15 psi pneumatic / 4-20 mA electro-pneumatic; split range 3-9 / 9-15 psi available
• Supply Pressure: 2-10 bar (standard), 2.5-7 bar optimal operating range
• Operating Temperature: -20°C to +70°C; custom temp ranges available on request
• Positioning Accuracy: 1% of full range (linear cam)
• Sensitivity: 0.25% of signal range
• Hysteresis: 0.5% of full stroke
• Linearity: 1% of full stroke
• Cv Max Low Flow: ND 1/4" inlet = 0.34; ND 1/4" outlet = 0.34
• Air Consumption: 1.02 Nm³/h (0.6 SCFM) at 400kPa (60 psi)
• Feeding Connection: ND 1/4"
• Electrical Connection: ND 1/2" NPTF
• Weight: Compact industrial grade construction (standard variant)
• Compliance: EN ISO 9001 quality standard; ATEX compliant for hazardous areas

The IMI STI PT Series SR/CCK Valve Positioner is widely applied in process automation systems across high-demand industrial sectors, serving as a critical control component for pneumatic valve sets. Key applications include:

• Oil and gas production, refining and pipeline systems
• Chemical and petrochemical processing plants
• Power generation (thermal, hydro and gas power stations)
• Metal production and metallurgical processing
• Offshore industrial facilities and marine applications
• Heavy manufacturing with harsh ambient conditions
• Process systems requiring copper-free components
• Industrial pipelines with butterfly, plug and ball valves
• Rotary and linear actuator control in process automation
• Hazardous area operations with explosive atmospheres

It is designed for proportional operation of rotary single/double acting actuators (for butterfly, plug, ball valves) and can be used with linear actuators when paired with a specific bracket.

Yes, it features a rugged design suitable for outdoor installation, and is also adapted for offshore, sandstorm, copper-free and various harsh industrial ambient conditions.

A full stainless steel construction option is provided, delivering superior corrosion resistance for chemical, petrochemical and high-humidity industrial environments.

Special cam profiles are available on request, with standard linear cams up to 270° angle supporting most common actuator stroke lengths. Cam adjustments are clearly marked for on-site calibration.

Yes, it is equipped with a split range signal spool valve, supporting 3-9 / 9-15 psi split range input signals for diverse process control requirements.

The positioner features marked range and angle adjustments for simple on-site calibration; its modular heavy-duty design minimizes maintenance needs, with easy access to components for routine servicing.

Yes, it is built to comply with ATEX directives for potentially explosive atmospheres, making it suitable for hazardous area operations in oil, gas and chemical sectors.

Pressure gauges are the standard accessory, with custom mounting brackets and connection adapters available on request for specific installation requirements.

For product inquiries, technical support, customization requests and order placement, please contact us via:

wechat/what's app/phone number:+8613472860702

Our professional team will provide timely and tailored solutions for your process automation and valve control needs.

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