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Cheap 3 way valves?

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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Cheap 3 way valves?

Unread postAuthor: Goats spudz » Sun Oct 23, 2011 12:07 pm

i want to make my gun semi auto i just cant find any 3 way dcv's in the uk, anyone know any good sites?
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Unread postAuthor: Gun Freak » Sun Oct 23, 2011 1:07 pm

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Unread postAuthor: Goats spudz » Sun Oct 23, 2011 2:59 pm

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Unread postAuthor: jackssmirkingrevenge » Sun Oct 23, 2011 3:04 pm

http://www.ebay.co.uk/itm/11-3mm-Thread ... 4cfa6557e4

I'm guessing it would fit this:

http://www.ebay.co.uk/itm/G1-4-Pipe-Pne ... 2314c06cd4

some real good deals on pneumatic parts on ebay but the thread sizes are so poorly defined!
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Unread postAuthor: Goats spudz » Sun Oct 23, 2011 4:35 pm

jackssmirkingrevenge wrote:http://www.ebay.co.uk/itm/11-3mm-Thread-Teal-Blue-Pneumatic-Hand-Slide-Valve-New-/330618460132?pt=LH_DefaultDomain_3&hash=item4cfa6557e4

I'm guessing it would fit this:

http://www.ebay.co.uk/itm/G1-4-Pipe-Pne ... 2314c06cd4

some real good deals on pneumatic parts on ebay but the thread sizes are so poorly defined!
hey JSR the top link looks like BS because they don't understand thread sizes and is the bottom one a dcv or a qev
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Unread postAuthor: jackssmirkingrevenge » Sun Oct 23, 2011 4:52 pm

Goats spudz wrote:hey JSR the top link looks like BS because they don't understand thread sizes


The problem is the people selling them, not the manufacturer. For example I bought this, fits 1/2" BSP perfectly

is the bottom one a dcv or a qev


Image

eBay seller wrote:G1/4" Pipe Pneumatic Quick Exhaust Control Valve QE-02


:roll:
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Unread postAuthor: Goats spudz » Sun Oct 23, 2011 4:56 pm

jackssmirkingrevenge wrote:
Goats spudz wrote:hey JSR the top link looks like BS because they don't understand thread sizes


The problem is the people selling them, not the manufacturer. For example I bought this, fits 1/2" BSP perfectly

is the bottom one a dcv or a qev


Image

eBay seller wrote:G1/4" Pipe Pneumatic Quick Exhaust Control Valve QE-02


:roll:
i want something like the MJVO-3 but 1/4" BSP, have you got a schematic that i can get machined?
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Unread postAuthor: al-xg » Sun Oct 23, 2011 5:15 pm

NPT threads do somewhat work with BSP, not something you'd want to take for granted especially at high pressures, but it does work ok in most cases.

Would be quite expensive to get something like that machined and that works as expected.
You can check out the ZDSPB website for diagrams and explanations on 3 way solenoid valves designed for high pressure air.
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Unread postAuthor: jackssmirkingrevenge » Sun Oct 23, 2011 5:23 pm

http://www.spudfiles.com/forums/diy-3-2 ... 21061.html

I'm guessing that's how the clippard valve works too.
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Unread postAuthor: Goats spudz » Sun Oct 23, 2011 5:59 pm

al-xg wrote:NPT threads do somewhat work with BSP, not something you'd want to take for granted especially at high pressures, but it does work ok in most cases.

Would be quite expensive to get something like that machined and that works as expected.
You can check out the ZDSPB website for diagrams and explanations on 3 way solenoid valves designed for high pressure air.
my dad works at a machine shop, and JSR i might order that blue slide check if the threads are the wrong size could i grind flat then re-tap and die the threads to 1/4" bsp with a lathe?
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Unread postAuthor: jackssmirkingrevenge » Sun Oct 23, 2011 6:15 pm

Goats spudz wrote:JSR i might order that blue slide check if the threads are the wrong size could i grind flat then re-tap and die the threads to 1/4" bsp with a lathe?


I doubt it, but seriously, it's less than 5 quid posted... what have you got to lose? Aside from 5 quid ;)
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Unread postAuthor: Goats spudz » Sun Oct 23, 2011 6:20 pm

Well... yes ok your right, anyhow can you explain why my quick connects leak at 150 psi up
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Unread postAuthor: Gun Freak » Sun Oct 23, 2011 6:31 pm

Dude, the slide valve will work fine. Even if you get the wrong size... buy a bushing. :wink:
anyhow can you explain why my quick connects leak at 150 psi up

It is probably a bad seal or a bad quality QC. Sometimes, though, you can put them in the wrong way, and if it is crooked it will leak. Connect it at low pressure so you can make sure it is straight.
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Unread postAuthor: Goats spudz » Sun Oct 23, 2011 7:00 pm

Gun Freak wrote:Dude, the slide valve will work fine. Even if you get the wrong size... buy a bushing. :wink:
anyhow can you explain why my quick connects leak at 150 psi up

It is probably a bad seal or a bad quality QC. Sometimes, though, you can put them in the wrong way, and if it is crooked it will leak. Connect it at low pressure so you can make sure it is straight.
erm... my QC was £2 :oops: i think i can solve the prob by putting a ball valve behind it or a non-return valve
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Unread postAuthor: POLAND_SPUD » Sun Oct 23, 2011 8:32 pm

JSR i might order that blue slide check if the threads are the wrong size could i grind flat then re-tap and die the threads to 1/4" bsp with a lathe?
When you buy stuff from ebay you have to have some knoledge because ppl selling stuff there are often incompetent

That's the case here

If you have doubts you can always email the seller and ask for clarification/ ask him if he has something with 1/4" BSP threads and he can check if the thing he is selling has BSP threads


Normally these guys are motivated to sell their stuff so if you write something along the lines of:

'I want to buy it but I've never heard of 11.3mm Threads. Could you check if it has NPT or BSP threads? I guess other buyers have the same problem as I do - so if you check it and provide correct info you will sell more'
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