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Light Spring Schrader Valve Core?

Hi,

This question may be off-topic everywhere, but Google shows that people do talk about Schrader valves here...

I needed to replace a leaking valve core in the unloader valve of my air compressor's pressure switch. Ordinary tire valve cores have a spring much too strong for the unloader's actuator to open. The local auto parts shops have no clue about a special light-spring valve core. I finally remembered the pressure release in my automotive compression tester, and have temporarily stolen that core for the compressor switch. Which means I still need the special core, just less urgently.

If it was a brand-name compressor I'd try for a replacement part, but it was home-made from surplus parts many years ago. The compression tester is also an antique. But the fact that I have two devices with the same light- spring valve core must mean they are available somewhere. Google found that water well snifter valves also use a light-spring Schrader, but hasn't shown me any place to just buy a replacement core. Does anyone have any clues?

Loren

Reply to
Loren Amelang
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How about clipping a couple of loops off a standard one to decrease the existing compression? Gerry :-)} London, Canada

Reply to
Gerald Miller

Gerald Miller wrote in article ...

Cutting a spring INCREASES its rate.

Reply to
Bob Paulin

Reply to
larry g

But it would DECREASE the effort required for initial deflection since there would be less pressure exerted by the shortened spring. Gerry :-)} London, Canada

Reply to
Gerald Miller

All the clues point towards your local well drilling folks maybe having one, have you tried calling them ???

Reply to
"PrecisionMachinisT"

Reply to
Peter DiVergilio

Sounds like a plan that would provide a new, fresh one. Thanks to all for the ideas!

Loren

Reply to
Loren Amelang

The local auto parts store looked up some of those and said the sizes and threads were different from the standard tire valve size that matches what I need. I don't know anything about A/C... What I need is exactly like a tire valve, except for the very light spring.

The local pump guys only deal with modern submersibles and bladder tanks. (I just went through a failure of my old windmill-style sucker rod pump system, so I'm _too_ familiar with available resources.) I have since found that Dean Bennett in CO sells the snifter valves by mail, and they're not a major expense. If Snap-On doesn't work out, I'll try that.

Loren

Reply to
Loren Amelang

Gerald Miller wrote in article ...

If you cut the spring, then stretch it so it applies the same original pressure to keep the valve closed, it will require MORE pressure to unseat the valve since the spring now has a higher spring rate.

If you cut the spring, but leave it so it doesn't apply the same original valve seat pressure - as you seem to be suggesting - you have, effectively, re-engineered the entire Schrader valve, and it is likely to not function correctly without the correct amount of spring tension working to seat the valve and hold the valve seated.

Reply to
Bob Paulin

To each, his own. Gerry :-)} London, Canada

Reply to
Gerald Miller

Gerry's method has been used successfully on compression testers. You just keep trimming the spring untill the valve doesn't close any more, then grab another one and cut off just a WEE tad less.

Reply to
clare

Hey Loren,

I take it that the spring from the compression gauge works as you want it to. How about just getting as new one of them? Snap-On Tools guy, or Craftsman store maybe?

Take care.

Brian Laws>Hi,

Reply to
Brian Lawson

replying to Brian Lawson, sliverga wrote: Why not just buy one online? They are called snifter valve cores. Very light springs. Standard Schrader style valve core.

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Reply to
sliverga

replying to Loren Amelang, Jose Felix wrote: Try snapon or matco! They specialize in automotive tools and do sell compression tester shredder valves

Reply to
Jose Felix

replying to Loren Amelang, Jose Felix wrote: Try snapon or matco! They specialize in automotive tools and do sell compression tester shredder valves

Reply to
Jose Felix

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