ebay QEV thread size

Show us your pneumatic spud gun! Discuss pneumatic (compressed gas) powered potato guns and related accessories. Valve types, actuation, pipe, materials, fittings, compressors, safety, gas choices, and more.
DasAbonnent
Private 2
Private 2
Posts: 39
Joined: Sat Nov 24, 2012 10:42 am

Fri Feb 12, 2016 2:45 pm

Do the cheap chinese QEVs from Ebay have a standard plumbing thread(1/2'')?
I am fed up from making my QEVs and having to spend a week to get them working :bounce: :bounce:

here is the QEV
http://www.ebay.com/itm/G1-2-Thread-Pip ... 1777806013
User avatar
matti
Specialist 2
Specialist 2
Finland
Posts: 251
Joined: Tue Oct 04, 2005 1:01 pm

Fri Feb 12, 2016 2:53 pm

They are probably BSP or NPT, both are "standard plumbing threads" depending where you live. So which one do you mean?

Edit: that link says G 1/2, so it has G (bsp) threads that are used for plumbing/pneumatics (except U.S. standard that is NPT)
DasAbonnent
Private 2
Private 2
Posts: 39
Joined: Sat Nov 24, 2012 10:42 am

Fri Feb 12, 2016 3:27 pm

I live in europe (France) and my friend in germany.
We both have this question.
User avatar
matti
Specialist 2
Specialist 2
Finland
Posts: 251
Joined: Tue Oct 04, 2005 1:01 pm

Sat Feb 13, 2016 10:59 am

DasAbonnent wrote:I live in europe (France) and my friend in germany.
We both have this question.
If the valve says G or BSP threads, then it should be OK for you..
AlfiePB IanB
Private 2
Private 2
Posts: 32
Joined: Fri Jan 15, 2016 3:28 pm

Wed Feb 17, 2016 2:28 pm

Just watch out for PT (read it may be a Japanese or Asian standard) also bear in mind some if not all the black box style ones have a smaller outlet orrifice than the advertised pipe size.
User avatar
CpTn_lAw
Corporal 5
Corporal 5
Posts: 987
Joined: Sun Sep 11, 2005 9:10 am
Location: France

Sat Apr 30, 2016 12:50 pm

Long time off the forums, Just to tell you I bought one from amazon, which is the same as those eBay ones.
The one I received is a QE-04 rectangular black box type with a brass port for exhaust. I live in France as well, no problems with the thread size. It's the standard 1/2" (15x21mm) for both chamber and pilot ports. The exhaust (barrel) is 3/8", or 12x17mm.

The main difference with this commercial bought QEV compared to my DIY QEV is the port inner diameter. On my homemade QEV it is 18mm ID, where on the commercial QV it is closer to 10mm.
This difference in port area is non negligible, and further testing will be needed to conclude if the faster opening time is worth downsizing the inner port.
"J'mets mes pieds où j'veux, et c'est souvent dans la gueule."
DasAbonnent
Private 2
Private 2
Posts: 39
Joined: Sat Nov 24, 2012 10:42 am

Sat Apr 30, 2016 4:46 pm

Alright, very interesting. Thanks:)
User avatar
jackssmirkingrevenge
Five Star General
Five Star General
Posts: 25745
Joined: Thu Mar 15, 2007 11:28 pm
Has thanked: 73 times
Been thanked: 48 times

Donating Members

Sun May 01, 2016 7:48 am

Unless stated otherwise it's safe to assume they are BSP threads on eBay stuff
hectmarr wrote:You have to make many weapons, because this field is long and short life
Post Reply