![]() ![]() This problem can occur if improper maintenance is performed on the valve. It should be verified that all parts are installed according to the manual and that all components are properly tightened. This case might be characterized by a chattering noise. Loose or missing partsĪnother cause can be loose or missing parts in the assembly. This fault can be diagnosed by energizing the solenoid and measuring the voltage across it, making sure that it is within the manufacturer-provided specifications. Undervoltage may cause the solenoid to never fully open, oscillating between the open and closed states, a state which produces abnormal vibrations and an audible hum. ![]() One potential cause is undervoltage, caused by improper control signal, faulty control system, bad wiring or control relay malfunction. ![]() However, if the noise or vibrations are excessive, this may point to one or more issues. They smoothen out the varying strength of the magnetic field by storing magnetic energy while the current is at its peak, and releasing it when the AC current is near to zero. Most solenoid valves include a shading ring, usually made from copper, which is used to buffer the magnetic energy created by the current flowing through the solenoid. They are the result of alternating current producing a varying magnetic field which acts on the armature of the valve. Soft buzzing and slight vibrations are normal in some types of AC solenoid valves. Solenoid valves operating on alternating current may produce a noise accompanied by vibrations. ![]()
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