Pneumatic Solenoid Valve Repair Solenoid Valve Troubleshooting

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#EngineeringHub #solenoidvalverepair • Many faults may arise due to the un-proper functioning of a solenoid valve. • Hence To avoid this fault, a solenoid valve used in the control system must work properly. • A solenoid valve is the most sensitive part used for loading/unloading of Air Compressor. • To obtain the best result from the solenoid valve, it must install in the proper way. • So, first, you have to know the installation procedure. Every instrumentation engineering people must have the information of this. • To Avoid Faults, Install with Below Points • 01) Solenoid Valve must be mounted inside the control panel. • 02) Before starting the valve ensures that the air supply to the valve is filtered lubricated. Even a momentary testing of a valve with dirty contaminated air may cause malfunctioning of the valve for the rest of working life. • 03) Ensure that an adequate quantity of air supply is connected to the inlet port. A minimum air pressure of 15 to 20 PSIG is required to start with the proper operation because these are a pilot operated the valve. Hence Air pressure to inlet port should not fall below the required limit. • 04) Connect electric supply marked on the solenoid valve without any loose connections. The solenoid is designed for the voltage drop plus or minus 10%. Ensure 230Volt supply to the coil. • 05) Always take care to connect the cylinder port (outlet) of the valve, to a suction valve. • If the valve is tested without connecting this port to a closed chamber, then due to heavy pressure drop, the pilot mechanism will not have enough pressure to operate the internal mechanism valve fail to function. • • • After proper installation, solenoid valve works properly (without faults). But Due to long working span, some faults may occur in the solenoid valve. • So, Here are the Faults and Its Rectification • A) COIL CHATTERING • This may happen due to below reasons. • 01) This type of valve requires proper voltage. A voltage drop or gain, more than 10 % affect the functioning of a coil. • 02) A clean inlet air is required, if dirt entering the plunger housing, coil chattering problem starts. • 03) A very low differential pressure range of load /unload will create the problem. Hence, Keep differential pressure ranges minimum 08 PSIG. • B) LEAKING VALVE • This may happen due to below reasons. • 01) The valve is being tested with the cylinder port kept open to atmosphere. The defect can be rectified by connecting the cylinder port to close chamber. (Suction valve) • 02) Inlet pressure is so low that the pilot mechanism cannot be actuated. Keep minimum air pressure above 15 PSIG. • 03) Pipeline connected to any of the valves is so narrow that the cylinder connected to valve gets starved of air causing a severe pressure drop-hence starving the pilot mechanism from getting minimum pressure. • To remove this fault, connect the valve to an adequate supply of compressed air. • 04) Air leaking through the solenoid plunger housing when the coil is not energized. • A replacement of a plunger or plunger plug will rectify the problem. • 05)Air leaking through the exhaust port, this defect may take place either due to dirt entering the valve or due to wear out of sealing components. • Clean the valve or replace the sealing elements and rectify the problem. • Visit, https://www.engihub.com/faults-in-sol... • Get the Best Engineering Books at BIG DISCOUNT, Click Here, https://www.engihub.com • Also, like us on / bestengineeringhub

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