Pneumatic valve common troubleshooting and solutions

Many customers who do automation projects will encounter the problem of pneumatic valve failure. They do not know how to troubleshoot and delay production. Today, I have sorted out some troubleshooting guides to help you solve the problem quickly.

The valve can not be opened: first check the air source, whether the air source pressure is not enough, the normal pneumatic valve requires the air source pressure of 0.4-0.6MPa, if the pressure is too low, the thrust of the actuator is not enough, the valve can not be pushed; Then check the solenoid valve, there is no power, the coil is not burned out, many times the solenoid valve is broken, the gas path can not be cut, the valve does not move; Check the cylinder again, whether the sealing ring aging leakage, or the piston card astringent; Finally check the spool, whether the impurities in the medium are stuck on the spool, or do not rust for a long time.

Valve is not strict: first check the air source, when the air source pressure is not enough, not enough thrust is not in place; Then check the locator, whether the zero point of the locator is floating, resulting in the valve is not closed in place; Then check the sealing surface, whether there are impurities stuck between the sealing surface, wear the sealing surface, or long-term cavitation damage to the valve core; There is also a single role of the valve, whether the internal reset spring is broken, after the gas can not go back.

Valve switch is slow: first check the gas source pipeline, whether the pipe is too thin, the gas flow is not enough, the gas supply is not on; Then check the three parts, whether the filter is blocked, the air path is blocked, and the flow becomes small; Then check the cylinder, whether the sealing ring is aging, the friction force is becoming larger, and the piston is moving slowly; And whether the gain of the locator is too small, resulting in too slow movement.

Valve leakage: first check the external leakage, whether the packing is aging, or the gasket of the flange is broken, this can directly see the leakage point; Then check the internal leakage, is not strictly closed, just said those reasons; There is also the air leakage of the cylinder, whether the sealing ring of the cylinder end cover is broken, or the joint of the trachea is leaked, resulting in insufficient cylinder thrust.