In this video, Max explains how to select the right coil for your solenoid valve. View our coil range here ► https://tameson.com/valves/solenoid-v...
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Timecodes:
00:00​ - Intro
00:28​ - How solenoid valves work?
01:00​ - DC coil working principle
01:16​ - AC coil working principle
01:47​ - The difference between AC and DC
02:45​ - Outro
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A solenoid valve works using the following principle. When current flows through the coil, it generates a magnetic field which attracts the armature towards the center of the coil. Since the armature is drawn towards the center regardless of the polarity of the current, an opposing force is needed to return the armature into the starting position when there is no electricity. This is achieved by using a spring. In order to actually use the valve, the magnetic force generated by the coil must be larger than the spring force.

For a DC coil - the coil is energized allowing the magnetic force generated by the coil to overcome the spring force and thus the valve open, When it is de-energized, the spring force closes the valve.
With AC coils this is a bit more complicated. AC switches polarity , therefore twice per period the current in the coil is zero and thus the magnetic force is zero. This is a problem because the spring force is constantly pulling the armature down. This results in a vibration of the armature, which produces a humming sound and can cause stress the components. To fix this, a copper ring is installed around the armature. This ring stores some of the magnetic energy such that the armature will not vibrate.

When a solenoid valve goes from the OFF to the ON state, the coil should initially generate more force in order to overcome spring tension combined with the pressure of the fluid and the friction of the armature. Once the armature is lifted the coil can decrease the generated force in order to reduce power consumption and heating.

DC coils have a slower response time compared to AC coils due to the resistivity. As a result, DC coils will waste a considerable amount of power in the open state because more electricity is needed at higher resistivity. In other words, AC solenoid valves are more energy efficient compared to DC valves. But, as explained, AC valves do come with other drawbacks, such a possible vibrations.
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#tameson #solenoidvalvecoil

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