Beduan Brass Electric Solenoid Valve, 1/2" 220V Air Valve Normally Colsed for Water Air Gas Fuel Oil

This is verifiably a direct acting solenoid valve, meaning that all movement of the diaphragm is from the energized coil itself. It does NOT require a minimum operating pressure to fully open, which is a much more common design to find. However, that capability comes at a price: operation requires a very powerful coil. But powerful coils draw high CURRENTS and cannot sustain that full current for more than very short periods without OVERHEATING. If your application only requires that the valve be energized for 5 seconds every few minutes and NO MORE, you'll probably be fine using it as-is. Otherwise this MUST be driven using some form of active current/voltage control, i.e. PWM.The resistance of the coil for the 1/2" 12 VDC version measures 5.5 ohms, drawing just over two amps at 12 volts, dissipating 26 watts of heat, which is quite a lot in such a small space. The secret to success is understanding that full power is only needed for a brief time to initially open the valve but a MUCH smaller current will HOLD the valve open. In my case I've got an Arduino Mega driving an H-bridge motor controller that actually powers the coil. To open, full current is supplied for about 100 milliseconds after which it drops to a fraction of that by switching to PWM with around a 30% duty cycle to maintainin the open position. Using this scheme I've yet to have a failure to open or to stay open and the body of the valve never goes above ambient even after hours of being powered.The only other things to be aware of are that it makes a VERY loud click when activated and the threads are NOT NPT, they are not tapered - so expect to use a LOT of sealing tape if using conventional pipe fittings.

Great quality of product 👍

Once I spent the hour and a half tearing into my new compressor to remove the valve and add this, it went together smoothly. Spent the 7 minutes and 4kWH to fill the tank, and then later the nail gun wouldn't shoot. Realized I only had like 30PSI on the line because the valve wouldn't engage anymore.Now I have to empty an 80GAL tank to replace it back to the valve and return this thing. 12V version.

My valve came today and I hooked it up to a natural gas line. It was pretty straightforward. To connect it first take the screw off the little plastic relay cover, second pull the relay off the valve. Next using a small screwdriver slide it in the slot in the bottom of the relay cover and pop off the cover. Run your cord in the side of the cover through the connection hole. If you look at the bottom of the relay you will see three places to connect wires. Look at the bottom. The straight one has the "⏚" (ground) symbol. Your ground wire goes there. The other two are numbered, 1,2,3. Hook your white and black to 2 and 3, the order doesn't matter.Reassemble the whole thing and you're good to go.As of 20 minutes ago, the valve is working perfectly and is a great deal. Time will tell if it holds up, but so far, easy-peasy!

Seems well made, holds air pressure well, and releases quick upon applying the 12V. My application is only for short quick releases of pressure, so no issue with the solenoid getting even warm.

Appears to work well in 10 months of sporadic usage. Using to turn on/off propane gas to my stove on a boat. It is my understanding that this valve is not for continuous usage in the on position. The longest I have had it on is about 8 hours of continuous use because I forgot to turn off the pressure after I used the stove. Typical use is about 10 to 90 minutes while we are cooking.

I'm giving this 3 stars. I got a new 80 gallon air 220 volt compressor that feeds the air lines in my workshop, which has some minor leaks. Turning the line valve off at the compressor allows it to maintain pressure for days or weeks, but leaving it open causes the tank to lose most of its pressure by morning. I got tired of manually turning the valve or forgetting to. Therefore, I got this 220v solenoid to automate that. Turn the compressor on and the solenoid activates and the air lines pressurize. Turn it off and the compressor retains pressure.Here's my issues:1 - The solenoid buzzes and gets hot. I get it, solenoids do that. But, I feel it could have been significantly reduced.2 - The wiring connector fits a 1/2" knockout hole. That connector broke off.3 - It leaks on the input side. Seems like this would be my issue, but I have attempted to fix it a couple times. The output side doesn't leak. I don't have any other leaks near the solenoid. This isn't rocket science. This completely defeats the purpose of the solenoid.

Does what it claims