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Solenoid as semi auto?

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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Unread postAuthor: Gun Freak » Thu Aug 01, 2013 4:35 pm

The head of the fire extinguisher is basically useless. You may be able to use just the threaded part as a bushing (tap be threads in the hole), but the rest probably won't do you much good.

Once you get it taken apart we'll see if you can modify the plastic threads so that you could at least use the extinguisher as an air tank. I believe that type is tested to 300 psi, so you should be good.
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Unread postAuthor: eliechahine » Fri Aug 02, 2013 3:09 am

Are you sure it's useless?

The daystate any many other commercial airguns use similar valves , i took it apart for a better view..

and my god the spring is huge

Image
Image

The blue tube would screw in the valve and the entire thing inside the fire extinguisher..not sure if the blue plastic tube is going to be usefull in my 150 bar tank
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Unread postAuthor: jackssmirkingrevenge » Fri Aug 02, 2013 5:23 am

With a weaker spring it might do. Try pressurising it and using an actual hammer to tap it open, see how that goes :)
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Unread postAuthor: eliechahine » Fri Aug 02, 2013 5:33 am

Will do as soon as i get my air tank which should be sometime tomorrow.

Anyways i have been reading about some posts and found this gun..it really amazed me and wanted to check about something.

http://www.spudfiles.com/forums/psg-1-s ... 21786.html

pic of the gun http://www.hostingpics.net/viewer.php?i ... G_3190.jpg

I was wondering if the blowgun in the second pic is attached to anything to pilot the qev, and if i keep squeezing the blowgun will that give me full auto?
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Unread postAuthor: jackssmirkingrevenge » Fri Aug 02, 2013 6:04 am

eliechahine wrote:I was wondering if the blowgun in the second pic is attached to anything to pilot the qev, and if i keep squeezing the blowgun will that give me full auto?


Not quite. He uses a ball valve to cut off flow from the main chamber and fill the firing chamber every time. Every time squeezes the blowgun, you only get one shot.

If you want full auto, you will need a pop-off pilot.

[youtube]http://www.youtube.com/watch?v=nkibwn6wEns[/youtube]

If you want semi auto, it's best to pilot with a three-way valve.

[youtube]http://www.youtube.com/watch?v=YwiHi2oeABA[/youtube]
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Unread postAuthor: eliechahine » Fri Aug 02, 2013 6:41 am

Not quite. He uses a ball valve to cut off flow from the main chamber and fill the firing chamber every time. Every time squeezes the blowgun, you only get one shot


I was thinking the same as you, until i rechecked his video and noticed he doesn't open and close the ball valve every time he wanted to take a shot, he just opens it and he get the semi auto.
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Unread postAuthor: eliechahine » Fri Aug 02, 2013 8:25 am

So what do you think .. open the valve once and the chamber will pressurize by itself or should i keep opening and closing the valve before every shot?

It's not what he did in the video though
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Unread postAuthor: jackssmirkingrevenge » Sat Aug 03, 2013 12:31 am

eliechahine wrote:So what do you think .. open the valve once and the chamber will pressurize by itself or should i keep opening and closing the valve before every shot?

It's not what he did in the video though


Note that he leaves the ball valve cracked open. This means that when he pulls the trigger to empty the QEV pilot, gas is coming out of the blowgun but at the same time entering from the main chamber. This not only inefficient in terms of gas wastage, but for a given pilot valve, you will also have reduced performance.

This is why 3 way valves are a better idea, because actuating them simultaneously empties the pilot and cuts off the gas from the main chamber.
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Unread postAuthor: eliechahine » Sat Aug 03, 2013 1:49 am

By 3 way valve you mean like the blue slide valve in the video you shared with me in an earlier post?

or one of these:

http://www.stcsupply.com/Fitting/3%20WA ... 20PIPE.jpg
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Unread postAuthor: jackssmirkingrevenge » Sat Aug 03, 2013 1:57 am

Yep. Some info on them here: http://www.spudfiles.com/forums/directi ... 20438.html

They also come as "trigger" style valves: http://www.ebay.com/itm/JM-07-1-4-PT-Th ... 2c6a85a32c
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Unread postAuthor: eliechahine » Sat Aug 03, 2013 2:15 am

Alright thanks for the help.

i will post my finished project as soon as i get it done :lol:
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