Skip to main content

Valtek VL actuator with Logix 3200 MD positioner

Pneumatic Actuators - Linear - VL Series

BRAND: Valtek

Valtek VL series spring cylinder linear actuators are powerful, compact, high-performance pneumatic actuators that provide solid throttling or on-off operation for automatic control valves. The positioner supplies air to both sides of the piston, providing stiff, precise movement and high-frequency response and quick stroke speeds.


  • General Industry
  • Chemicals
  • Water
  • Oil & Gas
  • Power

industry sectors

  • Pulp & Paper
  • Mining
  • Steel & Primary Metals
  • Food & Beverage
  • Corn Wet Milling & Ethanol
  • Other Industries
  • Basic (Organic & Inorganic)
  • Specialty (Fine & Consumer)
  • Biofuels
  • Pharmaceutical
  • Water
  • Waste Water
  • Agriculture
  • Water Management
  • Desalination
  • Upstream Exploration & Production
  • Midstream Transportation
  • Downstream Processing
  • Nuclear
  • Conventional Steam
  • Geothermal
  • Combined Cycle
  • Concentrated Solar Power (CSP)
  • Biomass and MSW

SIL 3 capable

Design Range

Size Range: 25 in2 to 600 in2

Torque Rating Range: Up to 150 psi

Materials: Aluminum or carbon steel 

Features & Benefits
  • Multiple Positioners and Controllers — A variety of positioner/controller options makes the spring cylinder actuator ideal for numerous control requirements.
  • High Frequency Response — Double-acting configuration responds quickly to signal changes.
  • Dynamic Positioning Accuracy — Supply pressure is modulated to both sides of piston for stiff, precise actuator operation; small air volume between the piston and the bottom of the cylinder provides powerful pneumatic stiffness, allowing a high pressure drop—without plug slamming.
  • Low Air Consumption — Cylinder design uses less supply air than comparable diaphragm actuators.
  • High Thrust Capability — 150 psi (10.3 bar) operating pressure allows substantially higher thrust capabilities than comparable diaphragm actuators. Higher thrust allows tighter valve shutoff.
  • Longer Stroke — Longer strokes provide better process control. Size 25 spring cylinder linear actuators have a 1½ inch (38 mm) stroke, in contrast to a ¾ inch (19 mm) stroke on a comparable linear diaphragm actuator. Larger actuators have similar comparisons; stroke lengths are available up to 24 inches.
  • Fail-Safe Spring — Internal spring provides fail-safe operation in the event of air system failure. Spring bench set is not required.
  • Compact and Light-weight — For easier installation and maintenance, spring cylinder linear actuators are substantially lighter and more compact than comparable linear diaphragm actuators
  • Simple Maintenance — Periodic maintenance is easy to perform since the spring cylinder actuator only requires the removal of three parts to access all internal parts
  • Durable Components — High-quality materials require little maintenance. There is no diaphragm to rupture
  • Wide Range of Sizes — Standard actuator sizes 25, 50 and 100 will handle thrust requirements for over 95% of process applications; larger sizes through size 600 are available for special applications.
  • Fewer Parts — Spring cylinder linear actuators have one-third the number of parts as diaphragm linear actuators; wear parts cost 10 percent of those for diaphragms, and less inventory is required to maintain actuators
  • Field Reversible — Failure mode is easily reversed without additional parts. Reduces inventory costs
  • No Pressure Regulator Required — Cylinder actuators easily handle air supplies up to 150 psi (10.3 bar) without a pressure regulator and can be operated with as little as 30 psi (2.1 bar)*. (* Operating pressure on some sizes is limited because of valve sizes.)

How to Reverse the Fail Action and Air Action on a Valtek® VL Actuator

This video explains how to reverse the fail action and air action of Flowserve’s standard spring Valtek VL linear actuator. It explains the steps involved with the safe disassembly and reassembly of the actuator and its components to accommodate both fail open and fail closed configurations.


Our global expertise and local service centers ensure that you stay up and running. Learn more about our services.

Learn More

Use Flowserve VirtualPlant 3D models of various plant types to help you 'see' our capabilities in key industrial applications.

Explore Now