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AirCom valves are electromagnetically controlled industrial devices. They are basic automation components for fluid control, belonging to the category of actuators, and are not limited to hydraulic or pneumatic applications. They are used in industrial control systems to adjust media direction, flow rate, speed, and other parameters. Solenoid valves can be combined with different circuits to achieve desired control, ensuring precision and flexibility. There are many types of solenoid valves, each serving different functions at various positions in the control system; the most common types include check valves, safety valves, directional control valves, and speed control valves.

AirCom valve operating principle

The solenoid valve contains a sealed chamber with through-holes at different positions, each connected to different oil pipes. A piston is located in the center of the chamber, with two electromagnets on either side. When the coil of the magnet on one side is energized, the valve body is attracted to that side. By controlling the movement of the valve body, different oil discharge ports are opened or closed, while the oil inlet port remains normally open. Hydraulic oil enters different discharge pipes, and the oil pressure pushes the piston of the hydraulic cylinder. The piston then drives the piston rod, which in turn drives the mechanical device. Thus, mechanical motion is controlled by switching the current to the electromagnets on and off.

AirCom valve routine maintenance

1) Pay attention to the storage environment of the valve; it should be stored in a dry, ventilated indoor space, with both ends of the flow path blocked. 2) Valves should be inspected regularly, cleaned of dirt, and coated with anti-rust oil on their surfaces. 3) Valves that have been installed and applied should undergo regular maintenance to ensure normal operation. 4) Check whether the valve sealing surface is worn, and repair or replace it as necessary. 5) Inspect the wear condition of the trapezoidal threads on the valve stem and valve stem nut, and check whether the packing is outdated or failed, replacing them as necessary. 6) Test the sealing performance of the valve to ensure its integrity. 7) Valves in operation should be in good condition, with all bolts on flanges and supports present, threads undamaged, and no looseness. 8) If the handwheel is lost, it should be replaced promptly; do not use an adjustable wrench as a substitute. 9) The packing gland must not be skewed or lack pre-tightening clearance. 10) If the valve operates in a harsh environment prone to contamination by rain, snow, dust, sand, etc., a protective cover should be installed on the valve stem. 11) The scale on the valve should remain complete, accurate, and clear; check the valve's lead seal and cap. 12) The insulation jacket should have no dents or cracks. 13) Avoid striking valves in operation or using them to support heavy loads.

AirCom valve classification

Solenoid valves are divided into three main categories based on their operating principle: 1) Direct-acting solenoid valve. Principle: When energized, the electromagnetic coil generates electromagnetic force that lifts the closing member from the valve seat, opening the valve; when de-energized, the electromagnetic force disappears, and the spring presses the closing member against the valve seat, closing the valve. Characteristics: It can operate normally under vacuum, negative pressure, and zero pressure conditions, but the nominal diameter generally does not exceed 25mm. 2) Step-by-step direct-acting solenoid valve. Principle: It combines direct-acting and pilot-operated principles. When there is no pressure difference between the inlet and outlet, energizing the valve causes the electromagnetic force to lift the pilot small valve and the main valve closing member sequentially, opening the valve. When the pressure difference between the inlet and outlet reaches the starting differential pressure, energizing the valve causes the electromagnetic force to act on the pilot small valve, increasing the pressure in the lower chamber of the main valve and decreasing the pressure in the upper chamber, thereby using the pressure difference to push the main valve open; when de-energized, the pilot valve uses spring force or media pressure to push the closing member downward, closing the valve. Characteristics: It can operate reliably under zero pressure difference, vacuum, or high pressure conditions, but has higher power consumption and requires horizontal installation. 3) Pilot-operated solenoid valve. Principle: When energized, the electromagnetic force opens the pilot hole, causing the pressure in the upper chamber to drop rapidly. A pressure difference forms around the closing member (lower pressure above, higher pressure below), and the fluid pressure pushes the closing member upward, opening the valve; when de-energized, the spring force closes the pilot hole. Inlet pressure rapidly enters the chamber through the bypass hole, forming a pressure difference around the closing member (higher pressure above, lower pressure below), and the fluid pressure pushes the closing member downward, closing the valve. Characteristics: The upper limit of the fluid pressure range is relatively high, and it can be installed in any orientation (customization required), but the fluid pressure difference conditions must be met.

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