Pneumatic Valve Actuator - China Pneumatic Valve Actuator Manufacturers Suppliers Factory

Company Profile

Founded in 2006, Zhejiang Bigtork Valve Automation Co., Ltd. specializes in the design and manufacture of pneumatic and hydraulic actuators for rotary and linear valve applications. Since 2011, BIGTORK has supported domestic and international oil & gas and industrial projects, providing actuator sizing, application engineering, manufacturing, testing and technical support for demanding valve automation requirements.

Why Choose Us?

Proven Experience

Founded in 2006, BIGTORK has built extensive experience in the design and manufacture of pneumatic and hydraulic valve actuators. Since 2011, we have supported valve automation projects in domestic and international markets, serving a wide range of industrial applications.

Engineering Expertise

Our engineering team supports actuator sizing, configuration and application engineering for both standard and project-specific requirements. Proprietary sizing tools help ensure accurate actuator selection, while technical support is available throughout project execution and the product lifecycle.

Manufacturing Capacity

BIGTORK operates four dedicated actuator production lines with an annual production capacity of approximately 60,000 units. Advanced CNC machining centres and CNC lathes support efficient production, dimensional accuracy and consistent product quality.

Quality Assurance

Quality is controlled throughout material inspection, machining, assembly and final testing. Critical components are sourced from qualified suppliers, and every actuator undergoes final inspection and functional testing before delivery. Test documentation can be provided in accordance with project requirements.

Lifecycle Support

From actuator selection and project configuration to manufacturing, testing and after-sales support, BIGTORK works with customers throughout the equipment lifecycle. Our engineering and service teams provide responsive support to help ensure reliable actuator operation and efficient project execution.

Global Project Experience

BIGTORK has supported valve manufacturers, engineering companies and industrial customers across international markets. Experience gained from oil & gas and industrial valve automation projects enables us to respond to diverse application requirements and demanding operating conditions.

Valve Actuator Air
BG series valve actuator air are designed in many different model number combinations of actuator sizes, cylinder diameters. The valve actuator air can provide a wide torque output range from 4.6Nm to 500000Nm, which the high torque can
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Air Piston Actuator
An scotch yoke air piston actuator is a valve switch device can converts energy into compressed air into rotary mechanical motion to achieve the valve open and close. It mostly called scotch yoke pneumatic actuator. Bigtork® scotch yoke
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Air Operated Actuator
Air operated actuator as a valve drive to achieve the valve open and close through change the energy of compressed air into rotary mechanical motion. Air operated actuator normally sort for rack & pinion and scotch & yoke type. They are
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Industrial Valve Actuators
Industrial valve actuators are CE, ATEX, SIL3 certified, approved by and produced according to the very latest technology, standards and regulations for industrial and offshore applications. According to type and kind of
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Compressed Air Valve Actuator
Compressed air valve actuator as a valve drive to achieve the valve open and close through change the energy of compressed air into rotary mechanical motion. Compressed air valve actuator normally sort for rack & pinion and scotch & yoke
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Industrial Pneumatic Actuators
Industrial pneumatic actuators are CE, ATEX, SIL3 certified, approved by and produced according to the very latest technology, standards and regulations for industrial and offshore applications. According to type and kind of
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Pneumatic Butterfly Valve Actuator
For a butterfly valve to start opening from a completely closed position, higher torque is required to overcome the friction between the seat and valve body. Lower torques are needed to keep the valve moving in the middle section of the
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What is Pneumatic Valve Actuator？

A pneumatic valve actuator uses compressed air to generate the force or torque required to open, close or position a valve.In quarter-turn applications, the actuator converts piston movement into rotary torque through a rack-and-pinion or scotch-yoke mechanism. Pneumatic rotary actuators are commonly used with ball, butterfly and plug valves.

A pneumatic valve actuator may also be described as an air-operated valve actuator, compressed-air valve actuator or air-powered valve actuator.

Key Benefits of Pneumatic Valve Actuators

Reliable Operation
Pneumatic actuators use a relatively straightforward mechanical design and are widely used for reliable valve operation in industrial process applications.

Double-Acting and Fail-Safe Options
Double-acting configurations use compressed air in both operating directions. Spring-return configurations use stored spring force to provide the specified fail-safe action when the air supply is removed.

Fast Operating Capability
Pneumatic actuators can be configured for rapid valve opening or closing, subject to actuator size, available air pressure, airflow capacity and valve torque.

Application-Specific Configuration
Operating temperature, seals, coatings, accessories and certification requirements should be selected according to the actuator series and actual operating conditions.

Types of Pneumatic Valve Actuator

Rack-and-Pinion Pneumatic Actuators
Rack-and-pinion actuators use one or more pistons with integrated racks to drive a pinion shaft and generate rotary torque. Their compact design makes them suitable for many small and medium quarter-turn valves. Double-acting and spring-return configurations are available.

Scotch-Yoke Pneumatic Actuators
Scotch-yoke actuators convert piston movement into quarter-turn rotation through a yoke mechanism. They are commonly selected for larger valves and applications requiring higher torque near the beginning or end of valve travel.

Double-Acting and Spring-Return Configurations
Double-acting actuators use compressed air to operate in both directions. Spring-return actuators use compressed air in one direction and spring force to move the valve to its specified fail-open or fail-close position if the air supply is lost.

Application of Pneumatic Valve Actuator

Control of fluid flow in pipelines

Pneumatic actuators are commonly used to control the flow of liquids and gases in pipelines, such as oil and gas pipelines, water distribution systems, and chemical processing plants.

Petrochemical and Chemical Processing

Pneumatic actuators are used for on-off, isolation and modulating valve applications in petrochemical and chemical process systems.

Power generation plants

In power generation plants, pneumatic actuators are used to control the flow of steam and water in boilers, turbines, and generators.

Water and Wastewater Treatment

Pneumatic actuators automate valves in water treatment, distribution, pumping and wastewater-handling systems.

Food and beverage processing

In the food and beverage industry, pneumatic actuators are used to control the flow of liquids, gases, and solids in processing and packaging equipment.

Pharmaceuticals

Pneumatic actuators are used in pharmaceutical manufacturing processes, such as mixing and dispensing, to control the flow of liquids and powders.

Marine and Offshore

Pneumatic valve actuators are used in marine, offshore and coastal process systems, with materials and coatings selected according to environmental requirements.

General Industrial Processing

Pneumatic actuators provide automated valve operation for process skids, utility systems and industrial production facilities.

Main Components of a Pneumatic Rotary Valve Actuator

Inside a pneumatic valve actuator, a few key components work together to deliver this powerful force:

Actuator Housing or Cylinder
Forms the pressure chamber and supports the actuator’s internal drive components.

Piston Assembly
Converts compressed-air pressure into linear mechanical force.

Drive Mechanism
The rack-and-pinion or scotch-yoke mechanism converts piston movement into rotary torque.

Output Shaft
Transfers actuator torque to the connected valve stem.

Seals, Bearings and Air Ports
Seals help maintain pressure integrity, bearings support smooth movement, and air ports connect the actuator to the pneumatic control system.

How to Maintain Pneumatic Valve Actuator

Correct Actuator Selection

Correct sizing is essential for reliable operation. Selection should consider valve torque, minimum air pressure, action type, fail position, operating time, temperature and required accessories.

Routine Inspection

Regularly inspect the actuator, mounting connections, tubing, fittings and accessories for looseness, leakage, corrosion or damage. Test the open, closed and fail-safe functions according to the maintenance schedule.

Air Supply and Air Quality

Supply air should be clean, dry and maintained within the pressure range specified for the actuator. Filters and dryers should be selected according to the site conditions and applicable product documentation. Do not add external lubrication unless permitted by the relevant BIGTORK manual.

How Does a Pneumatic Valve Actuator Work?

A pneumatic valve actuator converts compressed-air pressure into mechanical movement. In a rack-and-pinion actuator, piston movement drives the pinion shaft. In a scotch-yoke actuator, piston movement drives the yoke mechanism. The actuator output shaft then rotates the connected valve to the required position.

A double-acting actuator uses compressed air in both directions. A spring-return actuator uses compressed air in one direction and stored spring force to move the valve to its specified fail-safe position when the air supply is removed.

How to Select the Right Pneumatic Valve Actuator

Pneumatic actuator sizing should be based on valve torque, minimum available air pressure, required safety factor, action type, fail position, operating time and environmental conditions. Valve size alone is not sufficient for actuator selection.

Valve Torque and Safety Factor:

Use the valve manufacturer’s break-to-open, running and end-to-close torque data. Apply an appropriate sizing margin according to the valve condition and project requirements.

Action Type and Fail Position:

Confirm whether the actuator should be double-acting or spring-return and whether the required fail action is fail close, fail open or fail in place.

Air Supply and Environmental Conditions:

Use the minimum available site air pressure for sizing. Confirm the ambient temperature, corrosion conditions, hazardous-area classification and required environmental protection.

Operating Time and Control Mode:

Specify the required opening and closing time and whether the valve will operate in on-off or modulating service. Fast operation depends on actuator size, valve load, air pressure, tubing and airflow capacity.

Accessories and Project Requirements:

Confirm the required solenoid valve, limit switch box, positioner, filter regulator, quick-exhaust valve, manual override, certification and project documentation.

Our Factory

BIGTORK’s production facility covers approximately 20,000 m² and includes dedicated areas for machining, assembly, testing and warehousing.

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Our Certificates

FAQ

Q: What is a pneumatic valve actuator?

A ：Pneumatic valve actuator uses compressed air to generate the force or torque required to open, close or position a valve.

Q: Which valves use pneumatic rotary actuators?

A: Pneumatic rotary actuators are commonly used with quarter-turn valves such as ball, butterfly and plug valves.

Q: What is the difference between double-acting and spring-return actuators?

A: Double-acting actuator uses compressed air in both operating directions. A spring-return actuator uses compressed air in one direction and stored spring force to move to its specified fail-safe position when air pressure is removed.

Q: How is a pneumatic valve actuator sized?

A: Actuator sizing should consider valve torque, minimum available air pressure, safety factor, action type, fail position, operating time, temperature and project requirements. Valve size alone is not sufficient.

Q: Can a pneumatic actuator be used for modulating control?

A:Yes. A suitable actuator can be equipped with a pneumatic or electro-pneumatic positioner and the required feedback accessories for modulating service.

Q: Does a pneumatic actuator require electricity?

A: The actuator mechanism is powered by compressed air. Electrical power may still be required for accessories such as solenoid valves, limit switch boxes, positioners and control panels.

Q: What information is required for actuator sizing and quotation?

A: Please provide the valve type, size, pressure class, torque data, minimum air pressure, action type, fail position, operating time, temperature range, required accessories and quantity.

Zhejiang Bigtork Valve Automation Co., Ltd. is one of the leading pneumatic valve actuator manufacturers and suppliers in China. We warmly welcome you to buy customized pneumatic valve actuator at competitive price from our factory. Contact us for more details.

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