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ebay QEV thread size

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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ebay QEV thread size

Unread postAuthor: DasAbonnent » 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
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Re: ebay QEV thread size

Unread postAuthor: matti » 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)
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Re: ebay QEV thread size

Unread postAuthor: DasAbonnent » Fri Feb 12, 2016 3:27 pm

I live in europe (France) and my friend in germany.
We both have this question.
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Re: ebay QEV thread size

Unread postAuthor: matti » 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..
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Re: ebay QEV thread size

Unread postAuthor: AlfiePB IanB » 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.
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Re: ebay QEV thread size

Unread postAuthor: CpTn_lAw » 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.
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Re: ebay QEV thread size

Unread postAuthor: DasAbonnent » Sat Apr 30, 2016 4:46 pm

Alright, very interesting. Thanks:)
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Re: ebay QEV thread size

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Re: ebay QEV thread size

Unread postAuthor: jackssmirkingrevenge » Sun May 01, 2016 7:48 am

Unless stated otherwise it's safe to assume they are BSP threads on eBay stuff
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