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Why Solenoid Coils on Hydraulic Valves Burn-Out? - KEYOPO

Why Solenoid Coils on Hydraulic Valves Burn-Out? - KEYOPO
Issue Time:2017-07-04

"Could you explain heat generation in hydraulic valve solenoid coils? If the temperature of the coil increases what will happen to the directional control valve's function?" The short answer to this is: the solenoid coil will fail and therefore the hydraulic valve itself will cease to function. In other words, the high inrush current generates more heat than can be continuously dissipated by the solenoid. So if the plunger is not able to be completely pulled into its coil - due to a mechanical problem with the valve for example, then the insulation around the coil windings will burn and the coil will short out.

But what could go wrong that would stop the solenoid plunger from being pulled in completely? Well, contamination is a common cause. When hard or soft particles invade the clearance between the spool and its bore, the solenoid may not have enough power to fully shift the valve's spool. This is often referred to as "silt-lock". If silt-lock is the problem, then replacing the solenoid is a waste of time. Replacing the entire valve will BUY some time - until it too becomes 'silt-locked'. The solution of course, is to get the contamination problem under control.

Bottom line: burnt-out valve solenoids is another cost of failing to properly control contamination. 

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