Hi , i was planning to make airsoft full auto gun , with qev and adjustable pop off valve. The problem is when i fill the gun with air pop off dont pilot qev and all air goes thru pop off valve and it sounds like ss-shhhhhh. I think pop off cant pilot qev beacuse the air is still going from blowgun. I mounted on blowgun ball valve for smaller flow. I dont want to fill it from the chamber side so please help me.
Images
https://imagizer.imageshack.com/img922/7328/N7TloC.jpg
https://imagizer.imageshack.com/img921/4525/cJ5BdC.jpg
https://imagizer.imageshack.com/img923/2043/Oe9BWU.jpg
qev and pop off problem
-
keks2033
- Private 4
- Posts: 94
- Joined: Mon Feb 08, 2016 2:37 am
- Has thanked: 1 time
- Been thanked: 5 times
Air goes too fast through the gun to pump the wheels. Due to the large flow of pop-off, the valve cannot close. After the gun and in front of the pop-off valve, put a partition with a very small hole, with a diameter of 1-0.5 mm, not more, this will help.
-
jackssmirkingrevenge
- Five Star General
- Posts: 26203
- Joined: Thu Mar 15, 2007 11:28 pm
- Has thanked: 569 times
- Been thanked: 343 times
Why not? It would be much more efficient...Herwer wrote:I dont want to fill it from the chamber side so please help me.
Otherwise you're going to need to balance flow from the air feed that is just enough to put sufficient air to actuate the pop-off, but not too much that the air coming from the feed refills the pilot chamber so fast that the pressure doesn't drop enough to actuate the QEV.
hectmarr wrote:You have to make many weapons, because this field is long and short life
I dont get it. partition where? can you tell me morekeks2033 wrote:Air goes too fast through the gun to pump the wheels. Due to the large flow of pop-off, the valve cannot close. After the gun and in front of the pop-off valve, put a partition with a very small hole, with a diameter of 1-0.5 mm, not more, this will help.
Maybe if I puncture 1mm hole into piston and add spring to qev, this desing will work? i dont want to make chamber filled qev beacuse this is my last qev and i need this for other project. And I'd to make homemade qev that will be using hot glue piston or epoxy putty piston , so i cant make the holejackssmirkingrevenge wrote:Why not? It would be much more efficient...Herwer wrote:I dont want to fill it from the chamber side so please help me.
Otherwise you're going to need to balance flow from the air feed that is just enough to put sufficient air to actuate the pop-off, but not too much that the air coming from the feed refills the pilot chamber so fast that the pressure doesn't drop enough to actuate the QEV.
- Attachments
-
- blowwa.png (14.69 KiB) Viewed 9834 times
-
jackssmirkingrevenge
- Five Star General
- Posts: 26203
- Joined: Thu Mar 15, 2007 11:28 pm
- Has thanked: 569 times
- Been thanked: 343 times
The issue is the volume indicated, this expansion alone might be sufficient to fire the mechanism because of the pressure drop in the pilot volume.
hectmarr wrote:You have to make many weapons, because this field is long and short life
Sorry , but i am not really good in english , so it wont work for this? or i dont get it?jackssmirkingrevenge wrote:
The issue is the volume indicated, this expansion alone might be sufficient to fire the mechanism because of the pressure drop in the pilot volume.
how about this? he have big pilot volume, he is filling from pilot side and this is working for him with standart pop off. Maybe if i will add more pilot volume and change my adjustable pop off to standart it will work. He said that adjustable pop offs arent working with this desing. http://www.spudfiles.com/pneumatic-cann ... 37-15.html
-
keks2033
- Private 4
- Posts: 94
- Joined: Mon Feb 08, 2016 2:37 am
- Has thanked: 1 time
- Been thanked: 5 times
there is too much extra volume in the gun. Pop of the valve does not have time to lower everything, so that the piston valve would work. Try to fill the whole empty space with cold welding or epoxy glue. For air, make a channel 3-4 mm in diameter, this is enough.
- Attachments
-
I saw this http://www.spudfiles.com/airsoft-pellet ... 16151.html , and i tried to make it , tapped hop up chamber to 1/8 and attached it to blowgun , and it dont works its just jam , air is going thru the barrel and bbs are retreating to magazine from air stream (something like that), it shot 1time and that it not full auto , the bbs from magazine are just like being pushed back to magazine, what is the problem?
https://imagizer.imageshack.com/img924/6734/O9fO0j.jpg
https://imagizer.imageshack.com/img923/7034/N4Vzt3.jpg
https://imagizer.imageshack.com/img924/2885/51VaCW.jpg
https://imagizer.imageshack.com/img924/6734/O9fO0j.jpg
https://imagizer.imageshack.com/img923/7034/N4Vzt3.jpg
https://imagizer.imageshack.com/img924/2885/51VaCW.jpg
Last edited by Herwer on Sat Sep 21, 2019 12:08 pm, edited 1 time in total.
-
jrrdw
- Moderator
- Posts: 6572
- Joined: Wed Nov 16, 2005 5:11 pm
- Location: Maryland
- Has thanked: 39 times
- Been thanked: 22 times
- Contact:
I this picture
https://imagizer.imageshack.com/img924/6734/O9fO0j.jpg it looks like there is a piece of thread tape or a mar on the piston that could be the cause of the jamming. This is a piston QEV correct? My eye's aren't failing me???
https://imagizer.imageshack.com/img924/6734/O9fO0j.jpg it looks like there is a piece of thread tape or a mar on the piston that could be the cause of the jamming. This is a piston QEV correct? My eye's aren't failing me???