PP Fire-Retardant Process Electric Damper

Product Model	PPs plate-welded round electric air valve
Category	PP Machined Products
Reference Price	Price on request

Hot Customizable for Working Conditions 10 Technical Parameters

Product Overview

The PP Flame-Retardant Processed Electric Air Damper is an automatic airflow switching valve equipped with an electric actuator, mounted on a circular valve body welded from PP Flame-Retardant plates. The valve body is formed by rolling and welding PP Flame-Retardant plates, and the vane is driven to rotate by the electric actuator outside the valve through the valve shaft. Operators send switch signals from the control cabinet or upper computer, and after the actuator is powered on, it drives the vane to rotate between fully open and fully closed positions, achieving remote start/stop and automatic isolation of the air duct without manual on-site operation.

In automated exhaust systems, equipment start/stop, workshop zoning exhaust, maintenance isolation, and emergency ventilation interlock all require automatic valve switching. Electric dampers are linked with fans and purification equipment: when the fan starts, the valve automatically opens, and when it stops, the valve automatically closes to prevent gas backflow and loss of hot/cold air after shutdown; in emergency conditions, emergency dampers can be opened or relevant branch lines can be closed based on signals. The PP Flame-Retardant valve body self-extinguishes upon fire exposure and is acid/alkali-resistant, making it suitable for corrosive exhaust systems in indoor and fire-rated environments.

The flame-retardant electric air dampers processed by Xicheng Environmental Protection have a circular plate-welded structure, with non-standardized diameters and wall thicknesses, and are equipped with switching-type electric actuators, featuring full-open/full-close position feedback signals. They can also be selected with a manual reset mechanism for manual operation during power outages. Actuator protection level and torque are selected based on installation environment and vane torque.

Working Principle

The electric air damper is powered by an electric actuator. The motor in the switching-type actuator drives the output shaft to rotate approximately 90 degrees via a reduction gear, connecting the output shaft to the valve shaft of the air damper to drive the vane to rotate from fully closed to fully open or vice versa. After reaching the set position, the internal limit switch cuts off the motor power and holds the position, while simultaneously outputting a passive contact signal to indicate the valve's open/close status. A control circuit provides an open/close electrical signal to complete the action.

The corrosion-resistant and flame-retardant properties of the valve body are ensured by PP plates and matching welding electrodes, preventing rust and jamming of the vane in corrosive gases, and the material self-extinguishes without propagating flames upon fire exposure. The electric actuator is installed outside the valve body, not in contact with corrosive gases. Seals and bearings are provided at the valve shaft exit through the valve body to prevent corrosive gas leakage along the shaft while ensuring smooth shaft rotation. The actuator is connected to the plastic valve shaft via a bracket and coupling, with actuator torque matched to the vane's air-driven torque to avoid motor overload caused by an underpowered drive.

Structural Components

The electric air damper consists of a PP plate-welded valve body, vane, valve shaft, shaft seat seal, electric actuator, installation bracket, and flanges. The valve body structure is the same as that of flame-retardant processed manual air dampers, with reinforced vanes for large diameters. The difference lies in one end of the valve shaft extending from the valve body and connecting to the output shaft of the electric actuator via a coupling, supported by a metal bracket fixed to the valve body or pipeline.

The electric actuator includes a motor, reduction mechanism, limit switch, position feedback, and manual operation mechanism, with an outer casing protection level suitable for the installation environment. The valve body ends are PP flanges or socket connections, and the vane edges can be equipped with sealing strips to enhance closing air tightness. Control cables are connected to the actuator junction box, with switching-type actuators typically featuring power, open valve control, close valve control, and full-open/full-close feedback terminals. Large-diameter valves are selected with high-torque actuators or models equipped with reset springs.

Specification and Model Table

The following table outlines the differences in control types and functions of electric air dampers, which must be clarified during selection.

Type	Operation	Typical Application
Switching-Type	Full Open/Full Close	Remote Start/Stop and Isolation
Analog-Type	Any Position	Continuous Airflow Regulation
Reset-Type	Power Failure Return	Emergency Safety Position

Product Features

The PP Flame-Retardant Processed Electric Air Damper can be remotely automatically started/stopped and interlocked with equipment, serving as a key valve for automated corrosive exhaust systems. Its main features are as follows.

PP plate-welded valve body, self-extinguishing and acid/alkali-resistant
Electric actuator-driven, remote switching without on-site presence
Interlocked with fans and purification equipment to prevent backflow and cross-contamination
Features full-open/full-close position feedback for status monitoring
Large-diameter vanes reinforced, actuator torque matched
Optional power failure reset and manual operation for emergency convenience
Non-standard diameters and wall thicknesses, customized for flame-retardant air ducts

Body Material	PPs Flame Retardant Panels
Processing Technology	Roll Forming and Welding Assembly
Section Shape	Round
Drive Type	Electric Actuator
Control Type	Switching Full On/Full Off
Feedback Signal	Fully open and fully close in place
Flame Retardancy	Self-extinguishing
Corrosion resistance performance	Acid and Alkali Resistant Salt
Connection Method	Flange / Spigot
Emergency Operation	Manual reset optional

Application Industries

Exhaust ventilation for automated plating production lines with equipment start-stop control
Remote isolation valves for zoned exhaust systems in chemical workshops
Electric dampers with fan inlet/outlet interlock
Floor-level electric switch valves for centralized laboratory exhaust systems
Electric valves with signal-driven operation for emergency ventilation systems
Automatic isolation air duct valves for purification equipment maintenance
Corrosion-resistant electric exhaust dampers for unattended server rooms and pipe galleries

Typical Process Locations

Electric dampers are installed on circular PPs ducts requiring automatic operation or remote isolation, typically at fan inlets/outlets, equipment exhaust connections, zoned branch pipes, and emergency ventilation lines. When fan interlock is enabled, electric dampers are linked to the fan control circuit: valves open before fans start, and fans stop before valves close to prevent load-starting and gas backflow. Power supply, control cables, and maintenance space are reserved near actuators; actuators of high-mounted valves are oriented for easy maintenance.

In control systems, on/off electric dampers connect to digital output ports of PLCs or ventilation control cabinets, while position signals link to digital inputs. Valve status is displayed on supervisory interfaces. In systems with shared fans, branch dampers for inactive equipment close to save air volume. During commissioning, valve diaphragm movement is manually verified locally before remote linkage and position signal verification.

Switched electric dampers are suitable for simple on/off control, remote actuation, interlocking, and maintenance isolation with low cost, while analog Adjustment electric dampers are ideal for continuous valve position adjustment based on sensor signals to precisely control airflow or maintain constant face velocity/negative pressure, with actuators receiving standard analog signals to stop at any angle; switched types are used for multiple branch circuits requiring only on/off control, while analog types are used for VAV fume hoods and VFD linkage systems.

For standard electric actuators, after power failure, the valve remains in the position at the moment of power interruption and will not automatically open or close. When power is restored, it continues to operate according to the control signal. If the process requires the valve to automatically open during power failure (e.g., emergency ventilation, ensuring air circulation) or automatically close (e.g., preventing gas backflow, isolating equipment), a spring-return actuator should be selected: when powered, the motor overcomes the spring force to maintain the working position, and after power failure, the spring pulls the valve disc to the preset safe position. When ordering, the requirements for the power-off safe position and the return direction must be clearly specified. Standard hold-type and spring-return-type structures and prices differ and cannot be mixed. For high-safety requirement environments, manual reset and position feedback can also be added. During design, the safety strategy after power failure should be considered for each unit to avoid the valve being stuck in the wrong position in case of an accident.

If the actuator does not move or the motor is overloaded, common reasons include: the actuator torque selection being too small, the valve shaft being jammed due to dust accumulation and crystallization, the valve disc being stuck by foreign objects, the valve shaft and actuator being misaligned, the valve body deforming due to heat causing the valve disc to rub against the wall, and the limit switch position being improper causing the mechanism to jam. The actuator should be selected with sufficient margin based on the valve disc's aerodynamic torque, keep the valve shaft sealing area clean, align the valve shaft and actuator, and manually rotate the valve disc to ensure full flexibility before powering on for debugging. Prolonged overload will burn out the motor; it cannot be resolved by forcibly increasing the power supply or short-circuiting the overload protection. In case of an overload alarm, power off and troubleshoot mechanical issues first, address jamming and deformation, and then restart operation. If the valve itself has excessive torque, replace it with a higher torque actuator or reduce the valve disc and increase bearings to fundamentally eliminate overload.

Switched electric valves paired with conventional diaphragms still exhibit air leakage when fully closed, suitable for general isolation but require hermetically sealed electric valves with diaphragm edges equipped with soft sealing strips and actuators with sufficient closing torque for airtight requirements. When air leakage increases, inspect if the sealing strip is aging, if the diaphragm is fully closed (check limit and actuator travel), if there are foreign objects in the valve body, and if the actuator connection to the valve shaft is loose or slipping. For zero-leakage isolation applications, select electric sealed valves instead of conventional electric regulating valves.

Actuator is installed externally on the valve body, not contacting the pipeline gas under normal conditions, but corrosive gas may diffuse to the actuator when valve shaft seal fails or flange leaks, and strong acid/alkali environment will corrode the metal casing and bracket of the actuator. Ensure reliable valve shaft seal and leak-free pipeline flanges, select actuators with appropriate protection level and anti-corrosion coating according to environment, plastic casings or anti-corrosion covers can be selected for highly corrosive workshops. Seal cable inlet properly to prevent corrosive gas and moisture from entering the junction box.

Electrical considerations require reserving power supply, control cables, and junction boxes near the valve that match the actuator voltage; for analog models, signal cables and shielded grounding must also be installed. Spatial considerations should allocate space for actuator installation/removal, manual operation, and maintenance, while avoiding water dripping above the actuator. Mechanical considerations demand that the actuator bracket be secure, the valve shaft and actuator be coaxial, and the valve body weight be supported by pipe brackets rather than the actuator. For outdoor or humid locations, select high-protection-rated models with rainproof features. Before commissioning, verify that the power supply voltage matches the actuator's nameplate.

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