Gasket - USD Valve

[hydronaut]

I posted a previous message about dip tubes. Made some up and they worked great. Theans everybody for the advice.

Hopefully somebody can help me out with one laset question so I can put the valve into service.

Nut sure what type of material it is made of but there is a nylon? gasket at one side of the valve (the cap has do not remove stamped on it). Not sure if this is a one time use crush gasket but it is in rough shape.

It is 1/2 ID and arounf .68 OD. Any ideas what to use here or where to get on?



Thanks,

Andrew

[diverdown1955]

Hi Andrew,
My USD double manifold in (1962) had this plug on one end. USD, sold a Button
gauge that took up this space. As I remember, this was one tuff little washer, nylon
or an early teflon. I bet USD has a crate full somewhere in stock. send them a picyure.

take care,
Jerry
diverdown1955

[captain]

That gasket is still a current service item for the USD solid bar twin manifold, part #821011. Getting one from a shop may be difficult as most are either unwilling or unknowledgable.
That leaves a couple of other options 1- reuse it, I have done this many times with no problems. 2- buy an appropriate thickness sheet of nylon material and make your own.

http://www.aqualung.com/militaryandprof ... _07-07.pdf

[hydronaut]

Thanks again. Just wondering why they didn't use an o-ring. Also was wondering what it was made of.

Washer is in to rough shape to use. Can always cut from nylon rod on the lathe. I guess the question is would you use nylon or teflon?

Andrew

[antique diver]

I think the original is nylon. Copper also works very well with high pressure.

[luis]

You could try either of these two washers from McMaster-Carr.

95630A246
Low-Friction PTFE Flat Washer 1/2" Screw Size, .69" OD, .027"-.035" Thick

95606A470
Nylon 6/6 General Purpose Flat Washer 7/16" Screw Size, .69" OD, .02"-.04" Thick

They both have the dimensions you mentioned. The first one is $3.17 for a box of 10.

[captain]

In high pressure applications I have found PTFE too soft. Works fine in a tapered pipe thread, not so good as a washer or valve seat. Copper as suggested should also work.