Corrosion-resistant actuator

Product Model	Corrosion-Resistant Electric Actuator Series for Air Valves
Category	Laboratory Products
Reference Price	Price on request

Hot Customizable for Working Conditions 10 Technical Parameters

Product Overview

The corrosion-resistant actuator is a specially designed electric actuation device for driving corrosion-resistant air valves in acidic, alkaline, salt spray, and other corrosive gas environments. Standard actuators with external casings, motors, and terminal blocks exposed to corrosive gases for extended periods will rust and fail. Corrosion-resistant actuators incorporate corrosion-resistant design in housing materials, surface treatment, wire connection sealing, and connecting parts. They are directly installed on PP or PPs corrosion-resistant air valves to drive the valve diaphragm to complete opening, closing, or regulating actions, serving as the auxiliary power components for automated air valve systems in chemical, electroplating, laboratory, and semiconductor corrosion exhaust systems.

Corrosion-resistant actuators are categorized into two control types: on/off (switching) and analog. Switching actuators receive power signals to drive the valve fully open or fully closed, used for equipment interlocking and remote start/stop. Analog fast actuators receive standard control signals and can drive the valve to stop at any angle, suitable for variable airflow and continuous regulation. Product torque ranges from small to large, with small torque matched to small-diameter air valves and large torque to large-diameter and multi-leaf valves. The same corrosion-resistant platform covers multiple valve diameter specifications commonly used in laboratories, including custom non-standard sizes.

The corrosion-resistant actuators supplied by Xicheng Environmental Protection are compatible with PP round valves, square multi-leaf valves, and enclosed valves. Typical switching specifications feature a power supply of 220V and approximately 7W power, with torque ranging from several newton-meters to tens of newton-meters, with travel time increasing with higher torque. Analog fast actuators use an AC/DC 24V power supply with multiple torque options. Specific torque selection depends on valve diameter, diaphragm area, and airflow pressure. Actuators can be supplied as complete sets with valves to ensure matching connection dimensions and torque.

Working Principle

The power principle of the corrosion-resistant actuator is the same as that of a standard air valve actuator: when the motor is powered, it outputs low-speed high-torque through a reduction gear set, driving the output shaft clamp to rotate the valve shaft 0 to 90 degrees. Switching actuators operate to fully open or fully closed positions, stopping power supply via internal limit switches to maintain the position, with reverse action switching the power circuit. Analog actuators internally compare input signals with the actual output shaft position, driving the motor to rotate forward or backward to precisely stop the diaphragm at the target angle.

Corrosion resistance is the core feature of this product, achieved through multiple protections: the housing uses corrosion-resistant engineering plastic or metal casings treated with corrosion-resistant coatings to resist acidic, alkaline, and salt spray erosion. The junction box and outlet adopt sealed structures to prevent corrosive gases and moisture from entering the motor and circuit board. The output shaft, fasteners, and mounting brackets use stainless steel or corrosion-resistant materials, preventing galvanic corrosion when connected to PP valves. Seals between the output shaft and valve shaft prevent corrosive gases from leaking along the shaft into the actuator. Through these protections, the actuator can operate reliably in corrosive exhaust environments for long periods, with motors free from jamming, terminals free from corrosion, and controls free from failure.

Structural Composition

The corrosion-resistant actuator consists of a corrosion-resistant housing, motor, reduction gear set, output shaft clamp, limit switches and feedback, control circuit, sealed junction box, and mounting bracket. The housing is a corrosion-resistant sealed casing with a protection level suitable for corrosive and humid environments. The motor and reduction mechanism are enclosed within the housing, with the output shaft extending from the lower part of the casing, connected to the valve shaft via the clamp.

Switching models include built-in full-open/full-close limit switches and position feedback contacts. Analog models feature position sensors, servo circuit boards, and signal terminals, commonly powered by AC/DC 24V, with control and feedback as standard analog signals. The housing includes a manual operation knob for manual driving during offline debugging. The mounting bracket and fasteners use corrosion-resistant materials such as stainless steel, with the actuator securely fixed to the valve body. Different torque specifications have varying external dimensions and clamp ranges, matched to valve shaft diameters.

Specification Model Table

The table below shows typical specification grades of corrosion-resistant actuators, with specific torque and valve diameters matched during selection.

Type	Typical Power Supply	Torque Grades	Compatible Valve
Switching	220V	Small Torque Fast	Small-Diameter Round Valve
Switching	220V	Medium-Large Torque	Large-Diameter Multi-Leaf Valve
Analog	AC/DC 24V	Multiple Torque Ranges	Variable Airflow Adjustment Valve

Product Features

Corrosion-resistant actuators feature corrosion-resistant sealing, series torque, and comprehensive control types, serving as specialized drive devices for corrosion-resistant air valves in corrosive environments. Key features include:

Corrosion-resistant housing and sealed junction box, resistant to acid, alkali, and salt spray erosion
Shaft fasteners made of stainless steel or corrosion-resistant treatment, free from rust and jamming
Two control types: switching and analog, suitable for both opening/closing and regulation
Torque ranges from several newton-meters to tens of newton-meters, matched to various sizes
Covers small to large diameters and non-standard PP valves
Output clamp directly connects to the valve shaft, easy installation and replacement
Includes manual operation and position feedback, convenient for debugging and maintenance

Type	Digital Input / Analog Input
Switching Power Supply	220V
input type="text" value="Switching Power" /	Approximately 7W
Analog Power Supply	AC/DC 24V
Torque Specifications	From several Newton-meters to tens of Newton-meters classification
Output Stroke	0° to 90°
Anti-corrosion method	`Anti-corrosion housing with sealing`
Axial system materials	Stainless Steel / Corrosion-Resistant Materials
Manual operation	Manual Button
Companion Products	PP Corrosion-Resistant Air Valve

Application Industries

Electroplating Workshop Acid-Alkali Exhaust Dry Pipe Electric Actuator
Chemical Corrosive Gas Exhaust System Corrosion-Resistant Actuator
Semiconductor and Panel Factory Acid-Alkali Exhaust Valve Actuator
Lab Fume Hood Corrosion-Resistant Valve and VAV Valve Actuator
Metallurgical Acid Pickling Line Corrosive Exhaust Electric Actuator
Wastewater Treatment Plant Odor and Corrosive Gas Valve Actuator
Corrosion-Resistant Air Damper Automatic Control in Salt Spray Humid Environments

Typical Process Locations

The corrosion-resistant actuator is directly installed on the valve shaft extension of PP, PPs corrosion-resistant valves, depending on the valve's location in corrosive exhaust pipelines, equipment interfaces, and fan inlets/outlets. Digital input models connect to equipment interlock and remote on/off control, while analog input models connect to VAV controllers or PLC analog outputs. Although the actuator is designed for corrosion resistance, it should be installed as far as possible from dripping points directly below the pipeline. Ensure perfect sealing at the valve shaft, downward-facing cable outlet from the junction box with proper cable sealing, and add a corrosion-resistant cover over the actuator in highly corrosive workshops.

During selection, calculate the required torque based on the valve diameter, number of vanes, and maximum air pressure, then choose the corresponding specification with a safety margin. Larger torque is required for large-diameter multi-leaf valves and soft-seal enclosed valves. During installation, ensure the clamp is coaxially tightened with the valve shaft, and the actuator bracket is reliably load-bearing. First, manually rotate the valve to confirm its flexibility, then power it on to verify the switching direction, limits, and feedback. For analog models, calibrate the correspondence between the valve position (fully closed to fully open) and the signal. Regularly inspect the casing seal, shaft system, and corrosion on terminal connections during operation.

The main difference lies in corrosion protection. Standard actuator housings are typically made of common metal or plastic, with lower sealing levels for junction boxes and fasteners made of ordinary steel. They are prone to terminal corrosion, shaft rust and seizing, and motor dampness failure when used in acidic or alkaline ventilation environments. Corrosion-resistant actuators feature corrosion-resistant housings or coatings, sealed junction boxes, stainless steel shafts and fasteners, and output shaft seals, specifically designed to withstand corrosive gases and salt spray. Corrosion-resistant actuators should be selected whenever the damper transports acidic or alkaline corrosive gases or is installed in a corrosive workshop. Ordinary models cannot be used as substitutes, otherwise, the failure rate and replacement frequency will be very high.

Torque depends on the wind area of the valve vane, the pressure difference before and after the valve, the friction resistance between the vane and the shaft seat, the sealing pressure, and the safety factor. Generally, larger diameters, higher wind speed and wind pressure, and more vanes require greater torque; soft-sealing valves need to overcome the sealing ring pressure, and multi-leaf valves need to sum the torque of each blade. The simplest and most reliable method is to provide the valve diameter, type (round valve or multi-leaf valve), wind pressure, and medium to the valve manufacturer, who will select and match the complete anti-corrosion actuator based on experience and calculations. When selecting independently, ensure sufficient torque margin, as insufficient torque can lead to failure to operate, stalling, or motor burnout.

For scenarios requiring only full open/close, remote on/off, and device interlocking of dampers, select the corrosion-resistant on/off actuator. It features simple control and low cost, with a typical power supply of 220V. For dampers that need continuous position adjustment based on signals, used in variable air volume ventilators, negative pressure control, and airflow balancing, select the corrosion-resistant analog actuator. Its typical power supply is AC/DC 24V, capable of receiving standard control signals and providing valve position feedback. When both on/off and regulating valves are present in the same project, they should be configured separately. Frequent on/off actuation for analog regulation is not recommended, as it may lead to inaccurate positioning and potential motor damage.

Corrosion-resistant actuators can significantly extend service life in corrosive environments, but their corrosion resistance is related to protection level and medium strength, not immune under all conditions. Corrosive gases may still penetrate when exposed to direct spray of strong acid/alkali mists, sealing leaks from pipe flanges and valve shafts, failed junction box seals, or damaged enclosures. Ensure the damper itself is airtight, avoid direct spray and water accumulation areas for the actuator, regularly inspect seals, junction boxes, and fasteners, and promptly address enclosure damage or corroded terminals. For special highly corrosive media, inform the manufacturer of the composition concentration, and select higher protection levels or isolated installation solutions.

Slow operation is often caused by undersized torque selection, dust crystallization and jamming in the valve stem seat, valve disc rubbing against the wall, or excessive sealing pressure. Mid-trip stops are usually due to load exceeding actuator stall protection, limit switch activation too early, or insufficient power supply voltage. First, manually rotate the valve to check the full-range resistance of the air valve, eliminating mechanical jamming and foreign objects, then verify the power supply voltage and torque selection, and inspect the limit position. Lubrication in the valve stem seat of large-diameter air valves can become hardened in low temperatures, increasing resistance. For undersized selection, replace with a higher torque actuator; do not forcibly use it by increasing the protection current.

Mechanically, as long as the output shaft chuck matches the shape and size of the valve shaft, the mounting bracket can be secured, and the torque is sufficient, they can typically be compatible. However, it is recommended to purchase the valve and actuator as a set. Valve shaft diameters, square shaft dimensions, connecting flanges, and stroke limits may vary among different manufacturers. When self-providing, verify the valve shaft dimensions, rotation direction, full open/close angles, and bracket hole positions, and ensure the corrosion resistance level is consistent. Actuators supplied as a set with the valve have been matched and adjusted, ensuring greater reliability in torque, connection, and sealing, with clear post-installation responsibilities. For critical projects, it is advisable to use valves and corrosion-resistant actuators from the same manufacturer.

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