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Issue Time:2017-06-21
Noisy solenoid valves are sometimesmerely a nuisance, but they may also point to some problems that should beaddressed to prevent valve failure. Some valves produce noises even whenoperating properly, which is why it is important to be able to recognizewhether the valve is operating normally or there is a problem with the solenoidvalve, control circuitry or plumbing. The most common valve noises are listedbelow.
1.Humming or buzzing noise
2.Water hammer
3.Clicking noises

    4.Pneumatic valve exhaust

 This fault can be diagnosed by waysas followed:
1.by energizing the solenoid and measuring the voltage across it, making surethat it is within the manufacturer-provided specifications.
2.Some solenoids require speed-control devices for properoperation.
3.There are several approaches to solving the water hammer problem. One is toreduce the flow rate by uprating the diameter of the tubing. This reduces themomentum of the medium and as a result reduces the maximum amplitude of thepressure surge.
4.Another solution is to ensure that the valve closes gradually instead ofinstantly. This is not always an option when using solenoid valves, as some ofthem have fast state switches. The speed of opening and closing is indicated bythe response time of a solenoid valve. An electric or pneumatic actuated ballvalve switches state considerably slower than solenoid valves.
5.To eliminate wiring problems as the cause, the solenoid can be connecteddirectly to the controller using short leads.
6.If the wiring is correct, then the controller might be broken, or the problemmight come from one of the controller inputs, for example a bad sensor or badinput wiring that keeps cycling the solenoid valve.
7.Some pneumatic mufflers may need periodic maintenance to prevent the filterfrom clogging.

111-9916 1119916 VALVE GROUP SOLENOID , Applicable To Excavator E320B E320C E320D E325C E325D E330D, AFTERMARKET REPLACEMENT EXCAVATOR PARTS