High-Performance Pneumatic Actuators for Precision Flow Control

Precise Drive: Stable torque output and precise positioning, with an adjustable rotation angle of 90° (±5°) for reliable flow control
Robust & Reliable: Constructed with a hard anodized aluminum alloy body and corrosion-resistant coatings for durability in harsh conditions. The design minimizes wear on bearings, significantly extending service life
Effortless Integration: Equipped with standardized mounting interfaces compliant with ISO 5211, DIN 3337, and NAMUR standards, allowing for easy attachment to valves and the installation of limit switches and positioners
Operational Flexibility: Available in both Double-Acting and Spring-Return (Single-Acting) configurations, offering a wide torque range (e.g., from 3.5 Nm to over 160,000 Nm) to meet diverse application needs for power and fail-safe requirements
Smart Ready: Supports the integration of accessories like solenoid valves and electro-pneumatic positioners, providing a foundation for advanced automation and process control systems

KST Pneumatic Actuators

Power, Precision, Performance

AT Series (Rack & Pinion) – Compact design, smooth operation, ideal for standard industrial applications

K Series (Scotch Yoke) – High torque output (640–160,000 Nm), robust construction for heavy-duty valves
HPY Series – Reliable performance in general-purpose and corrosive environments
Stainless Steel Series – Exceptional corrosion resistance for harsh/sanitary applications
Pneumatic-Hydraulic Series – Hybrid power for precision control in high-force scenarios

Our pneumatic actuators ensure seamless compatibility with ball, butterfly, plug, and other rotary valves, providing reliable automation across oil & gas, chemical, water treatment, and power industries. From compact rack-and-pinion to high-torque Scotch yoke designs, KST delivers the right solution for your valve control needs.

Need Help Selecting an Actuator?

Rack Pinion Pneumatic Actuator

Single-acting output from 5

to 4200 Nm

Double-acting output from

8 to 8000 Nm

K Series scotch Yoke Pneumatic Actuator

Single-acting output from 640 to 36,500 Nm
Double-acting output from 1,000 to 160,000 Nm

K Series scotch Yoke pneumatic actuator

Single-acting output from 640

to 36,500 Nm

Double-acting output from

1,000 to 160,000 Nm

Scotch Yoke Pneumatic-Hydraulic Actuator

Single-acting output from 640

to 836,500 Nm

Double-acting output from

1,000 to 160,000 Nm

HPY Series Pneumatic Actuators

Single-acting output from 640

to 836,500 Nm

Double-acting output from

1,000 to 160,000 Nm

HPY Series Pneumatic Actuators

Single-acting output from 640

to 836,500 Nm

Double-acting output from

1,000 to 160,000 Nm

Stainless Steel Pneumatic Actuators

Single-acting output from 12

to 4000 Nm

Double-acting output from

20 to 8000 Nm

Stainless Steel Pneumatic Actuators

Single-acting output from 12

to 4000 Nm

Double-acting output from

20 to 8000 Nm

Stainless Steel Pneumatic Actuators

Single-acting output from 12

to 4000 Nm

Double-acting output from

20 to 8000 Nm

Hydraulic Actuator

Output torque: max.400,000

N.m

AT Dual Piston Rack Pinion Pneumatic Actuator

Open/Close/Angle Stroke

Pneumatic valve actuators use compressed air to automate the opening and closing of valves in fluid control systems. They offer fast response, high reliability, and safe operation in explosive environments. Widely used in oil & gas, chemical, water treatment, and food industries, they are ideal for improving automation and efficiency.

▶ALODUR is oxidized hard aluminum shell.

▶Double piston gear shift design,simply reverse thepiston to change the direction of the executionagency’s rotation

▶The integrated design,dual effectsandsingle effectshave the samecylinder and end cover,which isconvenient to changetherole by installingspringor removing spring.

▶Setuptwoindependentadjustmentscrewsaccuratelyregulating valve openingandvalvecontrollocation onthe outer side

▶Thehigh-quality aluminum alloy cylinderbody issqueezed,and theinnerhole and external surfaceof theprecision processingareperformed forhardanodeoxidationtreatment(underspecialcircumstances,the anode oxidation+specialfluoron coating),thelonger life life and thelowfriction coefficient.

▶Small molds Large torque.

K Series Scotch Yoke Pneumatic Actuator

Open/Close/Angle Stroke

The K Series pneumatic actuators are designed for automated opening and closing of 90° valves (ball valves, butterfly valves, plug valves, etc.). They utilize a high-strength rack and pinion drive for smooth and reliable operation. Single-acting output ranges from 640 Nm to 36,500 Nm, while double-acting output ranges from 1,000 Nm to 160,000 Nm, meeting valve actuation requirements in a variety of demanding operating conditions.

▶Modular design,standardized diversity combination.
▶ Setupaspecial high -intensity and guide shaft structure withrigorous anti-corrosion and wear-resistant treatment,running smoothly,sealed and reliable.
▶ High-intensityballink castiron boxes and boxlids,the surface-shot blasting
is treated with anticorrosive treatment,solid,firm,and beautiful.
▶ Theinner wall of the cylinder has ahard chrome and hindrance,which has extremely excellent wear resistance and corrosion resistance.
▶ Springfor electrophoreticanti-corrosion treatment,withaservice life exceeding1million times.

K Series Scotch Yoke Pneumatic Actuator

Open/Close/Angle Stroke

The K Series pneumatic actuators are specifically engineered for controlling 90° valves (including ball valves, butterfly valves, and plug valves), featuring a robust rack-and-pinion transmission mechanism that ensures smooth and reliable operation. Key advantages include: a proven endurance life exceeding one million cycles, with both double-acting and single-acting designs capable of delivering torque up to 365,000 Nm. These characteristics enable the actuators to meet valve drive requirements across a wide range of demanding operating conditions.

Scotch York Pneumatic-Hydraulic Actuator

Open/Close/Angle Stroke

The Scotch-York pneumatic-hydraulic actuators are fit for turn-off or metering control of 90° valves (such as ball valves, butterfly valves and plug valves). It can realize auto-matic control of industrial process with various accessories. There are two types of HPY scotch yoke pneumatic actuators: symmetrical and inclined, which correspond to two different torque output characteristics. The inclined yoke mechanism, with high starting torque and low operating torque is suitable for butterfly valve control; the symmetrical yoke mechanism, with more balanced torque curve is mainly suitable for ball valve. plug valve control.

▶The working medium is usually dry compressed air, inert gas or anti-wear hydraulic oil.
When the working medium is gas
▶Working pressure: 3-10bar
▶Maximum service pressure: 10 bar.
▶Recommended pressure: 4 – 6 bar Please consult our company when the medium is liquid.
▶Operating temperatures: Standard -20’℃ to +80℃
▶High Temperature: -20°C to +150°C
▶Low Temperature: -40°C to +80 °C ▶widely used in petroleum and natural gas.chemical industry, oil refining, pulp and paper making, water treatment, power plants and other industries

HPY Series Pneumatic Actuators

Open/Close/Angle Stroke

HPY scotch yoke pneumatic actuators are fit for turn-off or metering control of 90° valves (such as ball valves, butterfly valves and plug valves). It can realize automatic control of industrial process with various accessories. The principle is that compressed air enters the chamber to push the piston to do linear motion, and by transmission structures of the yoke pin and yoke groove, the piston’s linear motion will be converted into the yoke’s rotary motion, and drives the output shaft to rotate, thus achieving the control of the valve

1). Hydraulic Actuator Oil Supply Pressure: Up to 100 bar ( 1449psi )
2). Pneumatic Actautor Air Supply Pressure: Up to 10 bar ( 116psi )
3). Output Torque: Up to 160000 Nm ( 11790261 bf-in )
4). Temperature Range:
Standard: -20°C ~ +80°C
Low Temperature: -40 °C~ +80°C
High Temperature: -20 °C~ +120°C
5). Type: Double Acting, Single Acting ( Spring Return ) 6). Optional accessories: solenoid valves, limited switch, electric position
7). Lubrication: All the moving parts are coated with lubricants, extending their service life

HPY Series Pneumatic Actuators

Open/Close/Angle Stroke

HPY series actuators adopt a highly modular design concept and are divided into cylinder module (hydraulic cylinder module), box module and spring module to simplify field configuration. Users can flexibly choose the mode of action according to the actual use requirements, with strong mutuality and universality. It can easily realize the combination and replacement of single and double acting, manual operation and other modules without the need of special tools. Cylinder or hydraulic cylinder module can be configured on one side or on both sides.

▶Qi source pressure:43.5~145.5PSI (3～10bar);

▶Output torque:dual effects pneumatic1000～16000Nm;

▶Output torque: Single effect is motivated640～83650Nm;

▶The following temperature range is optional:

▶Standard:-20°F~200°F(-29℃～93℃)

▶Lowtemperature:-508～180 °F(-46℃～82℃)

▶High temperature:0°F～350°F(-18℃~177℃)

Stainless Steel Pneumatic Actuators

Open/Close/Angle Stroke

The stainless steel series pneumatic actuators are designed for use in extremely corrosive and harsh environments. Made entirely of stainless steel, they offer excellent corrosion resistance and long-term durability. They support on/off angular travel, with a single-acting lifespan of up to 40 million cycles and a double-acting lifespan of up to 80 million cycles. Their fully corrosion-resistant design makes them particularly suitable for demanding industries such as chemical, offshore, and food grade applications.

▶ALODUR is Stainless steel（304/316）

▶Double piston gear shift design,simply reverse thepiston to change the direction of the executionagency’s rotation

▶The integrated design,dual effectsandsingle effectshave the samecylinder and end cover,which isconvenient to changetherole by installingspringor removing spring.

▶Setuptwoindependentadjustmentscrewsaccuratelyregulating valve openingandvalvecontrollocation onthe outer side

▶Thehigh-quality aluminum alloy cylinderbody issqueezed,and theinnerhole and external surfaceof theprecision rocessingareperformed forhardanodeoxidationtreatment(underspecialcircumstances,the anode oxidation+specialfluoron coating),thelonger life life and thelowfriction coefficient.

▶Small molds Large torque.

Stainless Steel Pneumatic Actuators

Open/Close/Angle Stroke

▶ALODUR is Stainless steel（304/316）

▶Double piston gear shift design,simply reverse the piston to change the direction of the execution agency’s rotation

▶The integrated design,dual effects and single effects have the same cylinder and end cover,which is convenient to change the role by installing spring or removing spring.

▶Set up two independent adjustment screws accurately regulating valve opening and valve control location on the outer side

▶The high-quality aluminum alloy cylinder body is squeezed, and the inner hole and external surface of the precision processing are performed for hard anode oxidation treatment (under special circumstances, the anode oxidation+specialfluoron coating), the longer life and lower friction coefficient.
▶Small molds Large torque.

Stainless Steel Pneumatic Actuators

Open/Close/Angle Stroke

▶ALODUR is Stainless steel（304/316）

▶Double piston gear shift design,simply reverse the piston to change the direction of the execution agency’s rotation

▶The integrated design,dual effects and single effects have the same cylinder and end cover,which is convenient to change the role by installing spring or removing spring.

▶Set up two independent adjustment screws accurately regulating valve opening and valve control location on the outer side

▶The high-quality aluminum alloy cylinder body is squeezed, and the inner hole and external surface of the precision processing are performed for hard anode oxidation treatment (under special circumstances, the anode oxidation+specialfluoron coating), the longer life and lower friction coefficient.
▶Small molds Large torque.

Pneumatic-Hydraulic Actuator

Open/Close/Angle Stroke

Pneumatic hydraulic actuator can achieve three fault protection finction ( during power, control signal and pressure, off the case, can automatically close or open the valve ).
Pneumatic hydraulic actuator, can also according to the different work environment divided into lmmersion type and dry type hydraulic actuator, Immersion type hydraulic actuator may be immersed in sea water under 30-60 meters of sea water in work, can be long-term corrosion resistance to sea water. The actuator is widely used in shipbuilding, marine engineering and marine tidal power and other special conditions.

▶Hydraulic pressure: low operating pressure: 5MPa
Medium operating pressure: 16MPa ;
High operating pressure: 31.5MPa
▶Hydraulic medium: hydraulic oil or any other flame-resisting hydraulic fluid
▶Ambient temperature: -30’C~+100’℃ (or special temperature according to user requirements) ▶Rotation:90°+5°;
▶Closing direction: Clockwise closed; ▶Painting: according to customer requirement.

High-Performance Pneumatic Actuators for Precision Flow Control

Get a Valve Actuator Quote

KST Pneumatic Actuators

Power, Precision, Performance

Rack Pinion Pneumatic Actuator

K Series scotch Yoke Pneumatic Actuator

K Series scotch Yoke pneumatic actuator

Scotch Yoke Pneumatic-Hydraulic Actuator

HPY Series Pneumatic Actuators

HPY Series Pneumatic Actuators

Stainless Steel Pneumatic Actuators

Stainless Steel Pneumatic Actuators

Stainless Steel Pneumatic Actuators

Hydraulic Actuator

AT Dual Piston Rack Pinion Pneumatic Actuator

Open/Close/Angle Stroke

K Series Scotch Yoke Pneumatic Actuator

Open/Close/Angle Stroke

K Series Scotch Yoke Pneumatic Actuator

Open/Close/Angle Stroke

Scotch York Pneumatic-Hydraulic Actuator

Open/Close/Angle Stroke

HPY Series Pneumatic Actuators

Open/Close/Angle Stroke

HPY Series Pneumatic Actuators

Open/Close/Angle Stroke

Stainless Steel Pneumatic Actuators

Open/Close/Angle Stroke

Stainless Steel Pneumatic Actuators

Open/Close/Angle Stroke

Stainless Steel Pneumatic Actuators

Open/Close/Angle Stroke

Pneumatic-Hydraulic Actuator

Open/Close/Angle Stroke

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