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how does a Crosman model 1400 valve work?

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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how does a Crosman model 1400 valve work?

Unread postAuthor: jean » Fri Dec 28, 2007 4:48 pm

yeah see topic titel

i search on google "homemade airgun" and find at the first result a copper rifle it works with this valve.

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Unread postAuthor: paaiyan » Fri Dec 28, 2007 4:57 pm

The only google results I get on it come up with guns, and not the valve itself. If you can find a picture of the thing we might be able to help.
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Unread postAuthor: jean » Fri Dec 28, 2007 5:05 pm

ok only this pic i found on this website

text to the pic
"St. Lwei
Copper tubing house a Crosman model 1400 valve, pump and 781 rifled barrel. The straight pump rod is tipped by a knob from an old fishing reel. A magnet tipped
bolt is used to allow firing both BBs and pellets."
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Unread postAuthor: paaiyan » Fri Dec 28, 2007 5:22 pm

So... It looks like you pump it up with the rod in the larger tube then fire. I don't really know if that's what you want to know though. What do you need to do? Maybe we can help you better if we know what it's needed for.
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Unread postAuthor: jean » Fri Dec 28, 2007 5:53 pm

I don't know what type of valve it is.
it is a hammer valve, a piston valve, a valve same as in blowgun or what type of valve?

i will make the same thing it shows on the pic but i don´t know what type of valve it is.

generally i will understand the valve in work

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Unread postAuthor: jackssmirkingrevenge » Fri Dec 28, 2007 6:11 pm

it's a hammer valve, something like this <--- click on the stages to make it work ;)
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Unread postAuthor: Hawkeye » Fri Dec 28, 2007 6:23 pm

I'm not so sure it is actually a hammer valve. Crosman did develop a new valve that functioned without a hammer to prevent valve lock. It sounds more like your piston sear mechanism where the sear holds the valve shut.
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Unread postAuthor: jackssmirkingrevenge » Fri Dec 28, 2007 6:31 pm

Hawkeye wrote:I'm not so sure it is actually a hammer valve. Crosman did develop a new valve that functioned without a hammer to prevent valve lock. It sounds more like your piston sear mechanism where the sear holds the valve shut.


You're right there:

The valve design of model 140 itself was in response to failure analysis of field returns. The pneumatic valve designs of the models 107/108/109/110/120 are all prone to "lock up" which occurs when a gun has been severely over pumped to the point that the hammer impact is insufficient to release the knock off valve rendering the gun useless until dissembled. Failure analysis of such a gun would typically find fault with the basic design since no parts needed replacement. In effect nothing really failed except for the design which allowed the failure condition to occur. The earlier design of the model 101/102 with their external hammers typically wouldn't have had this problem since a little extra effort could always be applied.

That Crosman Chief Designer Rudy Merz felt pressure to fix this "design failure" is certain and his determination to forever eliminate "lock-up" is clear from the resulting design. The 140's blow off valve turns the whole problem of lock up on its head. The 140/1400 can fail in any number of ways, but it will never lock-up from over pumping.


Here's the exploded view:

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Unread postAuthor: LikimysCrotchus5 » Fri Dec 28, 2007 6:43 pm

Pic doesnt work :roll:
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Unread postAuthor: jackssmirkingrevenge » Fri Dec 28, 2007 6:46 pm

LikimysCrotchus5 wrote:Pic doesnt work :roll:


odd, it works for me. You can go here and click the diagram to embiggen ;)
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Unread postAuthor: LikimysCrotchus5 » Fri Dec 28, 2007 6:49 pm

Isnt she pretty? :D (the valve set up)

Well it seems like it works like most pnematic air rifles do.
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Unread postAuthor: jean » Fri Dec 28, 2007 7:08 pm

ok thanks
i see the pic with the copper rifle and it was really compact and beautifully :!:
so i wasn´t sure that is a hammer valve.

i wasn´t sure the 140 and the 1400 are the same. i found the site that you link in first post. thx

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Unread postAuthor: jackssmirkingrevenge » Fri Dec 28, 2007 7:13 pm

jean wrote:@jackssmirkingrevenge
i wont jump in your ass but you was a living dictionary


I would appreciate it if you don't hehe

don't thank me, thank the vastness of the internet and our Lord Google
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Unread postAuthor: tansit234 » Fri Dec 28, 2007 7:16 pm

Theres always Google patents. Only thing I liked Bill Clinton for, free access to the patent office . :D
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Unread postAuthor: jean » Fri Dec 28, 2007 7:42 pm

i will say you are a very helpfull user :)
this design woud work? but i dont know what the o-ring do when passed the tiny hole to the barrel. in other posts of you i see similar design ( bolt seals with o-rings passed an hole).... what do the o-ring? come it out the tiny hole to barrel?
can you follow me?

jean
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