Actuator – KRP

KLINGER rack and pinion pneumatic actuator produces linear torque output in compact design utilizing the same body and endcaps for double-acting and spring-return.

A pneumatic actuator converts energy into mechanical motion by using compressed air.
The instrument air builds up pressure which applies against the diaphragm or piston.
This moves the valve actuator to position on the valve stem and the result is mechanical motion.

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KRP actuator

Linear Rack and Pinion Pneumatic Actuator
Torque Output for DA032-DN350
Torque Output for SR052-SR160
Torque Output for SR180-SR350

Compact Design

  • The KLINGER rack & pinion pneumatic actuator produces linear torque output in a compact design utilizing the same body and end caps for double-acting and spring-return units.

Namur Mounting

  • Namur VDI/VDE 3845 and ISO 5211 dimensions on all sizes. No special blocks are required to mount solenoid valves, limit switches or positioners.

Degree of Travel

  • The standard angle of rotation is 90°. Additional travel rotations through 180° are available. Two independent external travel stop adjustments permit easy and precise adjustment of ± 5° in both directions. This adjustment may be made in either the open or closed position and provides for accurate valve alignment.

Multiple Shafts

  • The female pinion drive is standard with a double-square output drive, and optional with a double-D drive, keyed drive and designs to meet your specific requirements.

High Cycle Bearings

  • Multiple bearings and guides on pistons and racks for precise operation,low friction, high cycle life and a blowout proof pinion shaft.

Rugged Tooth Design

  • The pinion teeth are engaged the full length and stroke of the piston. The pinion height allows manual override without needing to remove the indicator.

High Visible Position Indicator

  • External open/close indicator as standard, available for all rotations.

High Cycle Life Wear Pads

  • Pistons incorporate double wear pads (skates) to separate the rack from the actuator wall and serve as both guide and wear bearings.

Long Service Life Spring

  • Epoxy-coated special steel springs are pre-loaded with nonmetallic materials. The stainless steel end-cap fasteners are extra long to allow for spring relaxation. All parts are corrosion-resistant.

Alternate Operating Media

  • Air pressure operation from 2.5 to 10 Bar (36 to 150 PSI). Water, nitrogen and compatible hydraulic fluids may also be used to power the actuator.

Stainless Steel Fasteners

  • All external fasteners are corrosion-resistant stainless steel.

High Cycle Life

  • Extruded aluminum body is internally machined and honed to exact specifications. Honing prevents dry spots from forming within the actuator bore and therefore eliminates premature seal failure—a critical aspect to long cycle-life. All external surfaces are hard anodized for corrosion resistance, with all units permanently lubricated at the factory.


  • All units are externally marked with a progressive traceable serial number.

Quality Assurance

  • 100% of all units are factory pressure and leak tested, and individually boxed for shipment.


  • KLINGER Die Erste offers wide range of adapters for many different types of valves—including butterfly valves, ball valves and plug valves—as well as a variety of pneumatic and electric automation accessories suitable for diverse industrial environments.
  • Please call +886 4 22328819 for details.

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