What is the air source triad of the valve actuator

The air source triad of the valve actuator is a device used for processing and controlling compressed air. It usually consists of three parts: an air filter, a pressure reducing valve, and an oil mist generator. It plays a crucial role in the pneumatic control system. Here is a detailed introduction: Air filter

Function: Mainly used to filter out impurities, moisture and oil droplets and other contaminants in compressed air to provide clean and dry compressed air, protecting downstream pneumatic components (such as valve actuating mechanisms) from wear and corrosion caused by contaminated particles, ensuring their normal operation and extending their service life.

Working principle: When impure compressed air enters the filter, it first passes through the filter screen or filter element, where larger impurity particles are intercepted. Then, the air passes through the filter material, further removing tiny dust, moisture and oil droplets, etc. Some filters may also adopt centrifugal separation, adsorption and other technologies to remove different types of contaminants more effectively.

Pressure Reducing Valve

Function: Used to adjust the input compressed air with a higher pressure to a stable pressure value suitable for the operation of valve actuating mechanisms, and to maintain the pressure stability, ensuring that the actuating mechanisms can operate reliably within the designed pressure range and avoiding the impact on the performance of the actuating mechanisms or even causing damage due to excessive pressure or excessive pressure fluctuations.

Working principle: By adjusting the spring force and the opening degree of the valve core inside the pressure reducing valve, the flow and pressure of the compressed air are controlled. When the input pressure changes, the valve core will automatically adjust its opening degree according to the balance relationship between the spring force and the air pressure, so that the output pressure remains at the set value. For example, when the input pressure increases, the valve core will automatically close slightly to reduce the gas flow, thereby lowering the output pressure; conversely, when the input pressure decreases, the valve core will automatically open wider to increase the gas flow, maintaining the output pressure stability.

Oil Mist Generator

Function: Adds an appropriate amount of lubricating oil mist to the compressed air, allowing the lubricating oil to enter the pneumatic components such as valve actuating mechanisms along with the air, lubricating the internal moving parts (such as the piston of the cylinder, the piston rod, the valve core, etc.) of the components, reducing friction, lowering wear, improving the working efficiency and service life of the pneumatic components, and also helping to prevent components from rusting and corrosion.

Working principle: Utilizing the negative pressure generated when compressed air passes through a special nozzle or Venturi tube, the lubricating oil is sucked in and atomized into tiny oil droplets, then mixed with the compressed air to form an oil mist, which is transported along with the air to the pneumatic components that require lubrication. Users can adjust the oil droplet dripping adjustment knob of the oil mist generator to control the amount of lubricating oil dripping, thereby achieving the appropriate lubrication effect.