The oil particles in compressed air from truck decomposed and forms varnish inside the solenoid valve assembly after certain period of operation of valve. Due to this pluger gets sticked to sleeve which fails the operation of valve. It would be highly appreciated if you could help me on following,a) How varnish created in air valves? b) How to test our valve design for varnish ?c) How to measure oil in compressed air from a truck?Air solenoid valves are common on cars, trucks, buses etc. running on air from vhicle air compressors, and they normally run without problems.Any solenoid for air will get the problem you describes if oil-mixed air with oil that might harden at normal temperature, or harden after a longer time exposed to air, or harden mixed with dust or air and/or water.I do not think any producer has overcome this problem, the only thing you can do is to put an antisticking disc or coating on top of your plunger, and this is more to avoid electrical/magnetic sticking.The real solution is to be sure that the air entering is filtrated, clean, without dust and water, and that your valve is eqipped with dampers and filters at exhaust ports, not admitting particels and exhast this way.

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