In this instructable you can see how an electrovalve actually works, how it looks like from the inside and how it can be used in an application that includes a water pump.

In the picture are seen the parts of an electrovalve. The polarity of the battery connection has no effect on the function of the electrovalve (at least mine!).

Step 1:

As you can see in this video when we let current pass through the solenoid, it becomes an electromagnet and attracts the permanent magnet downwards (as seen in video), this way in the fully constructed electrovalve acts like a valve that lets the water flow. When the current is off, the magnet is pushed upwards (as seen in video) from spring and closes a hole (passage of water).

Step 2: Electrovalve Driven From a 11.1V Lipo Battery

In this video the electrovalve is connected with a 11.1V lipo battery and as you can see it draws 290mA in order to let the water flow.

Step 3: Application: Pump and Electrovalve Connected With the Same Lipo Battery

Getting current at the same time, the pump sends water to the electrovalve and that lets it going through. You could notice that pump works but the water is not seen immediately going out of the electrovalve. This is because the pressure to electrovalve from the the water of the pump needs to get some level so that it could pass through. I had to triple the width of the holes you could see in the introductory picture in order to see some water!

<p>I&acute;m working in an automated irrigation system and have a pump and a electrovalve, the thing is I don&acute;t know how to set them up. Should I place the pump then the valve, or the valve then the pump? The pump triggers automaticly when it detects water passing through.</p>
<p>Hi! I assume that your valve is somehow electronic controlled (ex. arduino etc). If your valve and pump are at the same level and under water level, your valve should be first. When it is opened the water that passes through, triggers the pump that sends it anywhere! Another option is instead of triggering your valve simply power your in-water pump whenever you want water flow and don&acute;t use any valve.</p>
<p>HI, I think I recognise this valve. The solenoid just allows water pressure into the top section, then the water pressure operates the main valve, which is the black rubber disk in your video. The little holes are not for the main flow. The clever thing about these is that the water pressure also holds the valve closed.</p>
<p>Thanks for the useful comment. The black rubber disk doesn't seem to me moveable (in the video seems to have the same diameter with the white base) or bendable (I can't show that) in some way. That's why the holes came to my attention... but I like your idea more than mine!</p>
<p>Do you know where I can buy that particular valve?</p>
<p>Thanks for your interest. I bought this valve from the following link</p><p>http://www.banggood.com/Normally-closed-Magnetic-Solenoid-Valve-DC12V-DC24-AC220V-p-954495.html</p>

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