Pneumatic Valve Actuators: Double Acting

Achieve Precise & Reliable Control with Double-Acting Pneumatic Valve Actuators

Gain superior control over your industrial processes with our robust Double-Acting Pneumatic Valve Actuators. Engineered for precision and reliability, these actuators are the ideal solution for efficiently automating quarter-turn valves like ball, butterfly, and plug valves in a wide range of demanding applications.

Unlike spring-return actuators that rely on air for one stroke and springs for the other, our double-acting models use compressed air for both the opening and closing strokes. This provides full control over the valve's position at all times, ensuring consistent torque output in both directions. This makes them perfectly suited for applications where precise positioning and reliable two-way control are critical, even if air pressure is lost (where the valve would remain in its last position).

Key Features & Benefits:

• Positive Two-Way Control: Uses air pressure for both clockwise and counter-clockwise rotation, providing full control over valve opening and closing with consistent torque.
• High Torque Output: Capable of generating significant torque, making them suitable for larger valves or applications requiring greater force to operate.
• Fail-in-Last-Position (FILP) Operation: If air supply fails, the actuator holds the valve in its last controlled position, preventing unintended movement.
• ISO 5211 Compliant Mounting: Features standard ISO 5211 mounting patterns for direct, universal compatibility with a wide range of quarter-turn valves, simplifying installation and replacement.
• Visual Position Indicator: Clearly shows the current valve position (open/closed) at a glance for easy operational verification.
• Corrosion-Resistant Construction: Built with durable materials like anodized aluminum or stainless steel, ensuring longevity and reliable performance in harsh industrial environments.
• Adjustable Travel Stops: Allows for fine-tuning of the valve's open and closed positions for precise control and application-specific calibration.
• High Cycle Life: Designed for millions of cycles, ensuring long-term reliability and minimal maintenance.
• Versatile Accessories Compatibility: Easily integrates with a range of accessories including solenoid valves, limit switches, positioners, and air filter regulators.

Technical Specifications:

• Actuator Type: Double-Acting Pneumatic Quarter-Turn Actuator
• Motion: 90° Rotary (Quarter-Turn)
• Operating Media: Filtered, dry compressed air (non-lubricated or lubricated with compatible oil)
• Operating Pressure Range: 2.5 - 8 bar (40 - 120 psi)
• Temperature Range: -20°C to +80°C (-4°F to +176°F)
• Body Material: Hard Anodized Aluminium Alloy (or Stainless Steel for specific models)
• Piston Material: Die-cast aluminium alloy
• Shaft Material: Nickel-plated steel (or Stainless Steel)
• Seals: NBR (Buna-N) for standard temperatures, FKM (Viton) for high temperatures
• Mounting Standard: ISO 5211
• Air Port Connection: G1/8"
• Approval: CE

Ideal Applications:

Our Double-Acting Pneumatic Valve Actuators are engineered for critical control across diverse industries:

• Water Treatment: Controlling flow in pipelines and filtration systems.
• Chemical Processing: Managing corrosive and hazardous media with precision.
• Oil & Gas: Automated valve operation in refineries and pipelines.
• Food & Beverage: Hygienic and precise control of media flow.
• HVAC Systems: Regulating airflow and water flow in large-scale climate control.
• Power Generation: Managing steam, water, and fuel lines.
• Pharmaceutical: Ensuring accurate fluid control in sterile environments.
• Wastewater Treatment: Automating valve actions in demanding conditions.

Why Choose Our Double-Acting Pneumatic Actuators?

At Under Control, we provide robust and reliable automation solutions that empower your operations. Our Double-Acting Pneumatic Valve Actuators are meticulously selected for their precision, durability, and compliance with international standards, ensuring seamless integration and long-term performance in your most critical applications. With consistent torque in both directions and a fail-in-last-position capability, you gain peace of mind and enhanced control.

Upgrade your valve automation with unparalleled precision and reliability. Explore our range of Double-Acting Pneumatic Valve Actuators today and find the perfect fit for your industrial needs!

Customer Reviews:

⭐⭐⭐⭐⭐

"Reliable Control for Our Chemical Plant"

"We installed these double-acting actuators on several critical butterfly valves, and they've performed flawlessly. The consistent torque for both opening and closing is excellent, and the ISO mounting made installation a breeze. Highly recommend for precise control." - Process Engineer, ChemCo, June 2025

⭐⭐⭐⭐⭐

"Robust and Dependable"

"Needed a durable solution for our water treatment facility. These pneumatic actuators are solid, handling the humid environment without issue. The visual indicator is really helpful for quick checks. Very happy with the performance." - Operations Manager, AquaFlow, May 2025

Frequently Asked Questions (FAQs):

Q1: What is the main advantage of a double-acting actuator over a spring-return actuator?

A1: A double-acting actuator uses air pressure for both extending and retracting the piston, providing controlled power in both directions (open and closed). A spring-return actuator uses air for one stroke and springs for the return stroke (e.g., failsafe open or failsafe closed). Double-acting models offer consistent torque in both directions and hold their last position upon air failure, whereas spring-return models move to a predetermined safe position.

Q2: What does ISO 5211 mounting mean?

A2: ISO 5211 is an international standard that specifies the dimensions and characteristics of the interface between quarter-turn valves and actuators. This standardization ensures that actuators from different manufacturers can be directly mounted onto compatible valves, simplifying selection, installation, and replacement.

Q3: Can these actuators be used with different types of valves?

A3: Yes, these double-acting actuators are specifically designed for quarter-turn valves, which require a 90° rotation to operate. This typically includes ball valves, butterfly valves, and plug valves.

Q4: What happens if the compressed air supply fails?

A4: In the event of a compressed air supply failure, a double-acting actuator will typically hold the valve in its last commanded position (often referred to as Fail-In-Last-Position or FILP). This is a key difference from spring-return actuators, which will move to their fail-safe position (open or closed).

Q5: What accessories are compatible with these actuators?

A5: Our double-acting actuators are highly compatible with a range of accessories to enhance functionality, including:

• Solenoid Valves: For electrical control of air supply.
• Limit Switches: To provide electrical feedback on valve position.
• Positioners: For precise, proportional control of valve opening.
• Air Filter Regulators: To ensure clean, regulated air supply.