Pneumatic Actuated Butterfly Valve Manufacturer in India

A pneumatic actuated butterfly valve combines a quarter-turn butterfly valve with a pneumatic actuator for automated isolation or flow regulation. Speciality Valve offers pneumatic actuated butterfly valves that are wafer, lug and flanged types. Valve and actuator selection should consider valve size, differential pressure, seat design, required operating torque, available air-supply pressure, process temperature and service conditions.

Pneumatic Actuator Options:

Pneumatic actuators are selected according to the required operating torque, cycle frequency and fail position.

Single Acting Pneumatic Actuator – Uses compressed air for one direction and spring return for fail-open or fail-close operation.
Double Acting Pneumatic Actuator – Uses compressed air for both opening and closing movement.
Rack and Pinion Actuator – Compact rotary arrangement for quarter-turn pneumatic actuated butterfly valves.
Scotch Yoke Actuator – Selected where the required valve torque profile and operating conditions suit a scotch-yoke actuator arrangement.

Required air-supply pressure depends on the selected actuator and available plant-air conditions; approximately 4–8 bar may be used for many industrial actuator packages. Solenoid valves, limit switches, positioners and manual overrides can be incorporated according to the control arrangement.

Butterfly Valve Design:

The product range includes:

Pneumatic Actuated Flanged Butterfly Valve – Flanged construction for direct pipeline and equipment connections.
Pneumatic Actuated Lug Butterfly Valve – Lugged body arrangement for suitable piping and maintenance requirements.
Pneumatic Actuated Wafer Butterfly Valve – Compact design installed between mating pipeline flanges.

Wafer, lug and flanged configurations should be selected according to piping arrangement, flange compatibility, isolation requirements, maintenance needs and the approved valve design.

Materials and Seat Selection:

Material selection depends on process medium, temperature, pressure and corrosion conditions.

Material	Common Grades / Options
Carbon Steel	WCB
Cast Iron	Cast Iron
Ductile Iron	Ductile Iron
Stainless Steel	CF8, CF8M
Duplex Stainless Steel	F51
Super Duplex	F55
Special Alloys	Alloy 20 and suitable nickel alloys

Seat selection depends on process chemistry, temperature, pressure, leakage requirement and operating frequency. Common options include EPDM, NBR, PTFE, FKM and metal seats. Metal seating is selected for specific service conditions where soft seating is not appropriate.

Body, disc, shaft, seat and other wetted components should be selected as a compatible material system for the process medium, temperature, pressure and corrosion conditions.

Valve Ratings and Connections:

Parameter	Available Configuration
Size range	According to valve design and project requirement
Pressure Rating	According to butterfly valve design, body construction, seat arrangement and applicable connection standard
Valve type	Wafer, Lug and Flanged Butterfly Valve
Control Mode	On-Off or Modulating
Rotation	90° Quarter Turn
End connection	Wafer, Lug and Flanged
Seat	Resilient or Metal Seat
Air supply	Commonly 4–8 bar according to actuator design
Mounting	ISO 5211 where applicable
Process Temperature	According to valve body, disc, seat and sealing materials
Actuator Ambient Temperature	According to actuator model, seals and accessory specification

Pneumatic Actuated Butterfly Valve Technical Details:

Important operating and automation parameters include:

Air supply pressure: Commonly 4–8 bar, depending on actuator design.
Actuator torque: Sized according to valve breakaway, running and seating torque.
Fail Position: Fail-open, fail-close or specified position according to the actuator and pneumatic control arrangement.
Control: On-Off or modulating operation.
Position indication: Available through suitable limit switch or feedback arrangements.
Manual override: Available for applicable actuator configurations.
Environmental Protection: Actuator and electrical accessories selected according to the installation environment and required enclosure/protection classification.

Standards and Testing:

Applicable requirements may include:

API 609 – Applicable butterfly valve design requirements.
ASME B16.34 – Where applicable to the selected construction.
ASME B16.10 – Face-to-face dimensions where applicable.
ISO 5211 – Quarter-turn actuator mounting/interface.
API 598 / ISO 5208 – Applicable pressure and leakage testing.
API 607 – Only for applicable fire-tested designs.

Testing may include:

Shell pressure testing
Seat leakage testing
Valve cycling
Actuator functional testing
Torque verification
Dimensional inspection
Material verification
Open/close functional testing
Full 90° travel verification
Actuator torque/setting verification
Air-supply and pneumatic-function check
Fail-position testing
Solenoid and limit-switch function check
Positioner calibration/response check for modulating service
Manual override check where provided

Pneumatic Actuated Butterfly Valve Applications:

Cooling Water Lines – Automated isolation in industrial cooling circuits.
Water Treatment Piping – Isolation within filtration and treatment systems.
Seawater and Desalination Lines – Selected body, disc, shaft and seat materials for compatible saline service according to water chemistry, velocity and corrosion conditions.
Hydrocarbon Transfer Lines – Remote isolation of compatible oil and gas piping.
Chemical Process Lines – Automated isolation using suitable body, disc and seat materials.

Share the valve size, pressure rating, differential pressure, process medium, seat requirement, available air-supply pressure, required operating time, control mode and fail position with Speciality Valve for Pneumatic Actuated Butterfly Valve and actuator sizing.