Pneumatic control valve air source troubleshooting
1. Pipeline. Causes internal rust in the pipeline; corrosion of the pipeline causes air leakage and container rupture; stagnant water at the bottom of the pipeline causes insufficient air flow and increases pressure loss.
2. Components. Rusty pipes, accelerating filter clogging, so that the filter can not work; tube inside the valve into the rust, causing poor operation, air leakage; rust to make the components occlude, can not run smoothly; directly affect the components of pneumatic components, Causes poor conversion, air leakage and unstable operation; water droplets invade the actuator and cause poor operation; water droplets enter the components and make it unable to operate smoothly; water droplets flush the lubricant, causing poor lubrication, valve failure, and unstable actuator operation. Drops of water trapped in the valve cause insufficient flow and increase pressure loss; water hammer damage causes damage to components.
3. The environment. Drain water discharged from the exhaust outlet pollutes the environment. The malfunction caused by the failure caused by moisture is the removal of water, that is, the outlet temperature of the compressor is lowered so that the water contained in the water can be analyzed and discharged. For this purpose, a cooler and a separator should be installed and installed after the compressor, and an air filter should be installed in the population of the compressor. The horizontal pipe has a certain degree of inclination, and a drain valve is installed at the lower end. Export the dryer.
The following water removal measures can be used.
a. Adsorption water removal method: the use of materials with strong adsorption capacity to absorb water, such as silica gel, aluminum gel and molecular sieves, etc. b, pressure dehumidification method: increase the pressure, make the volume smaller, the temperature decreases, thus precipitation of water droplets.
c. Mechanical water removal: remove water with mechanical blocking, cyclone separation, etc.
d. Freeze water removal: Cool the air below the dew point with refrigeration equipment to condense water into water.
Second, the impact of oil and failure caused by the compressor lubricant oil mist mixed with compressed air, and withstand the heat sent with the compressed air, is the reason for compressed air oil. The effects of oil are as follows:
1. The sealing ring is deformed. The seal shrinks, the air leak valve fails to operate, the actuator output force is insufficient, the seal ring foams, the friction increases, the valve cannot move or the actuator output force is insufficient, the seal ring hardens, the friction surface wears, and the air leakage increases. Large; Increased friction, poor valve and actuator operation.
2. The environment. Chemical raw materials where industrial chemicals are in direct contact with the atmosphere alter the properties of the chemical raw materials; fire hazards are caused by direct contact with flames in industrial furnaces, etc.; metering instruments using air fail due to clogging of nozzles; extreme oil nuisance requirements due to valves and actuators are required. The sealed part of the leaked oil causes environmental pollution. The oil removal method is to use a degreasing filter. For example, oil mist particles are removed with a centrifugal filter, adsorbed with activated charcoal or de-oiled with a porous filter element.
Third, the dust caused by the impact and failure Compressor suction dust air into the pneumatic device, causing the pneumatic components friction, damage and increase friction. The effects of dust are as follows:
1. Control element. The control element rubs and wears and seizes, the action fails and cannot be reversed; it affects the stability of the pressure regulation.
2. Execution components. The actuator element rubs and wears and jams, and the action fails; reducing the output force.
3. Amplifiers and other pneumatic components with throttle. The throttle orifice of the nozzle baffle is blocked, and it fails due to oil contamination. The method for removing dust is to install an air filter at the suction port of the compressor, and then filter it with an air filter before entering the pneumatic device to periodically clean the filter or replace.
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