Double Acting Pneumatic Actuator

Step into a new era of fluid automation with our precisely engineered Double Acting Pneumatic Actuator. When you handle this device, the cool, solid touch of the hard-anodized extruded aluminum cylinder immediately communicates industrial-grade ruggedness. The sleek, oxidized ALODUR shell not only looks visually striking with its flawless metallic finish, but it also serves as an impenetrable shield against harsh, corrosive environments. Every cycle operates with a satisfyingly quiet, smooth hum, a testament to the low-friction composite bearings and perfectly machined rack and pinion gear system housed within. There is no grinding or metallic harshness—only the pure, efficient sound of optimized pneumatic energy converting into powerful mechanical rotation.

Beyond its robust physical presence, this actuator is meticulously designed to solve the most demanding pipeline control challenges. Facility operators constantly battle with equipment wear and inefficient torque delivery, which inevitably leads to costly downtime and maintenance headaches. By utilizing an advanced dual-piston gear shift design, this actuator maximizes kinetic energy transfer, delivering massive torque from a surprisingly compact footprint. The smooth, anti-rotation movement guarantees that your valves open and close with absolute precision every single time, minimizing fluid hammer and extending the life of your entire pipeline infrastructure. It is the ultimate reliable engine for your most critical flow control operations, ensuring your lines keep moving without interruption.

Product Specifications

​Key Features & Highlights

Our actuator is built to redefine operational efficiency. By prioritizing high-grade materials and intelligent mechanical layouts, we provide a product that actively reduces your maintenance overhead while boosting system reliability.

• Small Molds, Large Torque: The internal geometry is optimized to generate industry-leading torque output without requiring a massive, space-consuming footprint.

• Frictionless Operation: Racks on the back of the composite bearing, combined with piston guide rings and output shaft bearings, eliminate metal-on-metal friction. This drastically lowers the friction coefficient and extends the operational life.

• Visual Status Indication: Equipped with a multi-position indicator offering on-site visual instructions, making system monitoring effortless for facility managers.

• Corrosion Defiance: From the ALODUR oxidized shell to the 100% stainless steel fasteners, every exposed component is selected to withstand moisture, chemicals, and harsh weather.

Advanced Engineering Dimensions

Material & Durability

In the realm of heavy industry, equipment degradation is a constant threat. We combat this by utilizing a high-quality extruded aluminum alloy cylinder body. Both the inner bore and the external surface undergo precision machining followed by a rigorous hard anodic oxidation treatment. For highly specialized environments, we also offer an optional Teflon (fluoron) coating. Paired with all-stainless-steel fasteners, this actuator exhibits a remarkably low friction coefficient and an exceptional resistance to corrosive elements, guaranteeing a prolonged lifespan even in the most unforgiving industrial environments.

• Extruded aluminum alloy prevents structural deformation under high pressure.

• Hard anodic oxidation creates an impenetrable barrier against rust and chemical wear.

• Stainless steel fasteners ensure that structural integrity is maintained over decades of use.

Design & Mechanism

The beating heart of this device is its dual piston gear shift (rack and pinion) design. This mechanical architecture allows for a highly compact form factor that punches far above its weight class, delivering massive torque output. The movement is smooth, rapid, and highly precise. Furthermore, the inclusion of composite bearings and piston guide rings on the rack prevents any destructive metal-on-metal friction. This self-lubricating design principle ensures that energy is transferred purely into rotational force rather than being lost to internal resistance.

• Dual piston architecture maximizes pneumatic efficiency and output power.

• Anti-rotation mechanisms ensure stable and predictable valve positioning.

• Internal composite bearings drastically reduce wear and tear during high-frequency cycling.

Versatility & Interchangeability

Inventory management can be a logistical nightmare when dealing with diverse pipeline systems. We solve this through an ingenious integrated design. All double-acting and single-acting (spring return) models share the exact same cylinder and end caps. By simply installing or removing the spring groups, operators can instantly change the role and direction of the execution agency's rotation. This universal approach drastically cuts down on the need to stock multiple distinct actuator bodies, saving warehouse space and procurement capital.

• Identical cylinder bodies for both double and single-acting configurations.

• Effortless mode conversion by simply adding or removing springs.

• Streamlines procurement and simplifies on-site spare parts management.

Precision & Control

Fluid control is a game of millimeters. To give operators absolute authority over their flow rates, this actuator features two independent adjustment screws located on the external side. These allow for the precise regulation of the valve's open and closed positions, offering a switch angle adjustment of 90±5°. Whether you need to fine-tune a butterfly valve to prevent leakage or calibrate a ball valve for exact flow metering, these independent controls make on-site calibration straightforward and highly accurate.

• Dual external screws for independent open and close position tuning.

• Achieve exact 90±5° rotation for flawless valve seating.

• Longer adjustment screws configured in the cover for full-trip conditioning.

Standards & Compatibility

Integration should never be a bottleneck. The connection part of our actuator complies strictly with the latest international standards, including ISO5211 and DIN3337 (F03-F25). The gas source interface aligns perfectly with the NAMUR standard, allowing for the direct, safe installation of NAMUR standard solenoid valves without the need for custom adapter plates. Furthermore, the top slot is consistent with VDI/VDE3845, meaning you can instantly mount limit switch boxes, electric positioners, and position sensors (such as Pepperl+Fuchs or Turck) right out of the box.

• ISO5211/DIN3337 compliant bottom flange for universal valve mounting.

• NAMUR standard gas interface for seamless solenoid integration.

• VDI/VDE3845 top slot for instant accessory and sensor attachment.

Safety & Maintenance

Protecting your workforce is our top priority. Traditional spring-return actuators can pose severe physical risks during disassembly due to stored kinetic energy. Our product utilizes a combined pre-spring break whole group design. This means the springs are safely contained within a dedicated cartridge system. Whether during the initial factory assembly process or during on-site maintenance years down the line, operators can safely install, remove, or change the springs without the fear of explosive decompression or flying parts.

• Pre-compressed spring cartridges eliminate handling hazards.

• Safe and rapid disassembly for routine maintenance and seal replacement.

• Reduces labor time and liability during pipeline servicing.

Environmental Adaptability

Industrial operations don't stop for extreme weather, and neither should your equipment. By offering a comprehensive selection of O-ring materials, this actuator can be customized to survive virtually anywhere. The standard NBR seals provide excellent performance from -20℃ to +80℃. For scorching environments like steam lines or desert refineries, the Viton O-rings push the limit up to +150℃. Conversely, the Silicone O-rings ensure flexible, leak-free operation in freezing conditions down to -40℃. This thermal resilience makes it the go-to choice for global applications.

• Standard NBR O-rings for general industrial applications (-20℃ to +80℃).

• High-temperature Viton seals for extreme heat environments (up to +150℃).

• Low-temperature Silicone seals for arctic and cryogenic conditions (down to -40℃).

  

Why Choose Us

When you partner with us, you are aligning with over 30 years of uncompromising manufacturing expertise. Headquartered in the ""City of Valves"" — Wenzhou, China, our facilities are equipped with state-of-the-art CNC machining centers and rigorous testing laboratories. We don't just assemble products; we engineer complete flow control solutions that have been successfully exported to over 60 countries. Our deep understanding of the petroleum, natural gas, and chemical sectors allows us to anticipate your operational needs and deliver products that exceed international safety and performance benchmarks.

• Decades of Expertise: Over 30 years of specialized experience in industrial and sanitary valve automation.

• Global Footprint: Trusted by major industrial players across more than 60 countries worldwide.

• Certified Quality: Backed by internationally recognized certifications ensuring regulatory compliance.

• Collaborative Partnership: We operate on the core values of Professionalism, Integrity, and Win-Win Cooperation, acting as an extension of your own engineering team.

  

Frequently Asked Questions (FAQ)

To assist your engineering and procurement teams in making an informed decision, we have compiled answers to the most common technical inquiries regarding our actuators.

• How does the ALODUR oxidized shell improve the actuator's lifespan?
  The ALODUR hard anodic oxidation process penetrates the aluminum surface, creating a ceramic-like outer layer. This significantly increases the surface hardness and provides exceptional resistance against atmospheric corrosion, chemical splashes, and abrasive wear, ensuring the internal mechanisms remain protected for years.

• Can a double-acting unit be converted to a spring-return configuration on-site?
  Yes. Because our actuators feature an integrated design, the cylinder and end caps are identical for both configurations. By simply removing the end caps and safely inserting our pre-compressed spring cartridges, you can instantly convert the unit to a single-acting (spring return) mode without needing a new actuator body.

• What is the primary advantage of the dual independent adjustment screws?
  The dual screws allow technicians to independently adjust the exact stopping points for both the fully open and fully closed valve positions (90±5°). This micro-adjustment capability is crucial for ensuring zero-leakage seating in high-pressure lines and precise flow calibration.

• Are the mounting interfaces compatible with my existing pipeline accessories?
  Absolutely. The bottom flange strictly adheres to ISO5211 and DIN3337 standards, the air supply ports comply with NAMUR for direct solenoid mounting, and the top shaft features a VDI/VDE3845 slot. This universal compatibility means you can easily integrate existing limit switches, positioners, and valves without custom brackets.

• How does the rack and pinion design maintain consistent torque compared to other mechanisms?
  The dual rack and pinion system ensures that the air pressure acting on the pistons is converted into rotational force symmetrically. Combined with low-friction composite guide rings, this prevents the gear shaft from tilting or binding under load, resulting in a perfectly linear and consistent torque output throughout the entire 90-degree stroke.