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Yak 52 Pressure relief valve????

 
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jsnafziger(at)yahoo.com
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PostPosted: Fri Apr 06, 2007 7:11 am    Post subject: Yak 52 Pressure relief valve???? Reply with quote
Mark,

Quote:
The BEST solution .... Which is WAY WAY pricey... Is to purchase an
American made pressure relief valve and replace the Russian one...
Price.... $750. But... It lasts pretty much forever.

Which valve are you refering too that's so expensive?

I'm using a stainless steel Parker RH4A-Series adjustable relief valve
that works nicely so far ($152.31 from Royal Instruments. I can't
speak to the "lasts pretty much forever" part (yet), but it's stainless
with flouro seals. Plus, it was easy to engineer into my standard 3/8"
tubing and AN fittings, then the M14x1 thread and 42 deg metric stuff.
Thanks,
John
Yak-55M, Pitts Model 12

Don't pick lemons.
See all the new 2007 cars at Yahoo! Autos.
http://autos.yahoo.com/new_cars.html

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mark.bitterlich(at)navy.m
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PostPosted: Fri Apr 06, 2007 9:59 am    Post subject: Yak 52 Pressure relief valve???? Reply with quote
The best one I have ever seen is installed in Sergei Boriak's SU-31. I
got the part number off it and crossed it back to make and model and
priced it at over $700. I do not have the make and model in memory, but
I will be over near his aircraft tonight and might be able to look
again. Sounds like your model is a much better buy for the money
anyway!

Mark Bitterlich

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viperdoc(at)mindspring.co
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PostPosted: Fri Apr 06, 2007 7:38 pm    Post subject: Yak 52 Pressure relief valve???? Reply with quote
John,
Do you remember your part #'s.4Z CPI Compression port, RH4A NE (neoprene
Rubber BN nitrile Rubber ect, and did you get the 4000-5000 psi spring kit
or the 5000-6000 spring kit?
What fittings (thread type) did you use to anastamose the US fittings to
the metric?
For those interested the website address for Parker Instruments is as
follows:
www.parker.com/icd/cat/english/4131-RH.pdf
Doc
Quote:
[Original Message]
From: John Nafziger <jsnafziger(at)yahoo.com>
To: <yak-list(at)matronics.com>
Date: 4/6/2007 10:18:43 AM
Subject: RE: Yak 52 Pressure relief valve????



Mark,

> The BEST solution .... Which is WAY WAY pricey... Is to purchase an
> American made pressure relief valve and replace the Russian one...
> Price.... $750. But... It lasts pretty much forever.

Which valve are you refering too that's so expensive?

I'm using a stainless steel Parker RH4A-Series adjustable relief valve
that works nicely so far ($152.31 from Royal Instruments. I can't
speak to the "lasts pretty much forever" part (yet), but it's stainless
with flouro seals. Plus, it was easy to engineer into my standard 3/8"
tubing and AN fittings, then the M14x1 thread and 42 deg metric stuff.
Thanks,
John
Yak-55M, Pitts Model 12

Don't pick lemons.
See all the new 2007 cars at Yahoo! Autos.
http://autos.yahoo.com/new_cars.html




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viperdoc(at)mindspring.co
Guest
PostPosted: Wed Apr 11, 2007 2:54 pm    Post subject: Yak 52 Pressure relief valve???? Reply with quote
John,
Sierra Hotel..Thanks a bunch! I will need to use a higher pressure spring
than yours. I went on their site and found most of what you had said. The
AN conversion fittings I had forgotten that George had.
Thanks again.
Doc
Quote:
[Original Message]
From: John Nafziger <jsnafziger(at)yahoo.com>
To: <viperdoc(at)mindspring.com>
Date: 4/11/2007 5:16:44 PM
Subject: RE: RE: Yak 52 Pressure relief valve????



Doc,
Sorry for the tardy response.

The part-number for the relief valve is: 4M4F-RH4A-VT-SS-K3-C3
($152.31). This is from the Parker Control and Automation group. The
seals are flourocarbon rubber with PTFE backup rings and the 750-1500
psi spring kit (set to 750 psi).

Note, that I'm running a Yak-55m, which wasn't built with a compressor
hooked up. The original owner simply had a pilot controled ball valve
and a check valve. Once you started, you dumped the valve leaving an
empty tank. If you forgot, the pressure would rise until a line blew.
My current set-up is an attempt to fix the above.

>From compressor to tank:
- AN-5 Banjo fitting from the compressor (gesoco, $40)
- Coalescing filter with a drain (Parker Finite filter, S1R-6C04-023,
$221.60), closest I could come to the russian snot valve.
- Pressure relief valve: 4M4F-RH4A-VT-SS-K3-C3
- Pilot controled dump valve: Parker ball valve
- 4F-C4L-1-SS Parker check valve ($4Cool
- Air Tank

I haven't installed the filter, so no promises on the longevity of any
of the above. It's still a work in progress, I'm sure that will need
refinements. The kimballs also have a nice set up for the Model 12 and
have parts available. The original russian snot valve, filter,
pressure valve are all available at www.wlacrussianeng.co.uk, but I
couldn't make it past the metric/AN nightmare.

Now if I could only get the M9-35 mags timed, I'd be all set!

-John
Subject: RE: RE: Yak 52 Pressure relief valve????
From: Roger Kemp (viperdoc(at)mindspring.com)
Date: Fri Apr 06 - 8:38 PM

John,
Do you remember your part #'s.4Z CPI Compression port, RH4A NE
(neoprene
Rubber BN nitrile Rubber ect, and did you get the 4000-5000 psi spring
kit
or the 5000-6000 spring kit?
What fittings (thread type) did you use to anastamose the US fittings
to
the metric?
For those interested the website address for Parker Instruments is as
follows:
www.parker.com/icd/cat/english/4131-RH.pdf
Doc



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