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Pressure relief valve

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HBaker

Joined: 16 Nov 2008
Posts: 119

Posted: Sun Mar 29, 2009 6:45 pm Post subject: Pressure relief valve

What pressure should the pressure relief valve be set at?  everybody says the air tank should be set at 800 psi and the diagram says to set it at 750, but then the thing would be blowing off all the time, shouldn't it be set a little higher, something like 825 or something??



Henry

_________________
Currently building a Murphy Moose - any help would be appreciated.

dsavarese0812(at)bellsout
Guest

Posted: Sun Mar 29, 2009 6:48 pm Post subject: Pressure relief valve

The correct setting is 50 atmospheres which is approximately  735 PSI at sea level.

 Dennis

 [quote]   ---

mark.bitterlich(at)navy.m
Guest

Posted: Mon Mar 30, 2009 10:52 am Post subject: Pressure relief valve

The Russian setting of this device (out of the Sukhoi and Yak books I

have) is 50 atmosphere, which equates to about 735 PSI.  



The Russian system is designed to work at no higher than that pressure.

Exceed it at your own risk.  



If you have an EMERGENCY blow-off valve that is designed in as an EXTRA

safety measure on your Moose Henry, then it might be a good idea to set

it a little higher than 735 PSI, in which case 800 PSI on the emergency

bottle blow-off valve might be reasonable.  However, the primary

pressure regulator/relief-valve (whatever you want to call it) should be

set to keep the overall system pressure from not exceeding 735 PSI. 



Best Regards, 



Mark

 



--

HBaker

Joined: 16 Nov 2008
Posts: 119

Posted: Mon Mar 30, 2009 5:02 pm Post subject: Re: Pressure relief valve

Thanks guys



Does anyone know where I can buy one that is already set at 50 atmospheres? And a Gauge that will fit in the dash?



Henry

_________________
Currently building a Murphy Moose - any help would be appreciated.

mark.bitterlich(at)navy.m
Guest

Posted: Tue Mar 31, 2009 5:53 am Post subject: Pressure relief valve

Henry, the ones that the Yaks and  CJ's use are adjustable.  SUPPOSEDLY

they are set up from the factory to break at 50 atmos, and the ones Doug

Sapp sells are like that.  However, even if you buy one new, it is going

to change over time, so you might as well get used to the idea of having

to adjust it.  My opinion on the matter... And there is an alternative.

You can use ANY pressure relief valve that is set to release at 735 PSI

plus or minus a tad.  I saw one on Sergei Boriak's old SU-31 that was

really slick.  I remember looking it up by the part number, and tracing

it down to the people who made it.  I wanted one for my own airplane!

That was until I saw that the price was about $800 for that stainless

steel jewel!  So, I stayed with the cheaper stuff... But still...

They're out there and they are a lot better than what comes in the Yak's

and CJ's now.  The one I saw was adjustable from 700-900 PSI and held a

setting to within 5 PSI, and had a pull release ring on it to bleed the

system down.  Pretty cool.  If you have the money, I would recommend

looking into something like that.  



As for a gage... My input would be to just plumb everything with

standard AN fittings everywhere possible and stay away from, or convert

over from, metric.  To that end, a standard pressure gage in PSI would

be just fine.  Just look for something say from the 0-1000 psi range. 



Mark Bitterlich

 



--

warner.wesley(at)gmail.co
Guest

Posted: Tue Mar 31, 2009 7:51 am Post subject: Pressure relief valve

Guys,

  I replaced my entire air system quite a while ago and have since

sold the plane.  I used brand new stainless valves that were approx.

$120ea.  They came with no spring.  There was a spring selection chart

based on the pressure you want.  I don't recall the details off-hand,

and I'm out of town.  However, if anyone want's this info I can look

it up when I return home (I should have all the receipts).



Wes



On Tue, Mar 31, 2009 at 9:47 AM, Bitterlich, Mark G CIV Det Cherry

Point, MALS-14 64E <mark.bitterlich(at)navy.mil> wrote:

 	  Quote: 	
		   



 Henry, the ones that the Yaks and  CJ's use are adjustable.  SUPPOSEDLY

 they are set up from the factory to break at 50 atmos, and the ones Doug

 Sapp sells are like that.  However, even if you buy one new, it is going

 to change over time, so you might as well get used to the idea of having

 to adjust it.  My opinion on the matter... And there is an alternative.

 You can use ANY pressure relief valve that is set to release at 735 PSI

 plus or minus a tad.  I saw one on Sergei Boriak's old SU-31 that was

 really slick.  I remember looking it up by the part number, and tracing

 it down to the people who made it.  I wanted one for my own airplane!

 That was until I saw that the price was about $800 for that stainless

 steel jewel!  So, I stayed with the cheaper stuff... But still...

 They're out there and they are a lot better than what comes in the Yak's

 and CJ's now.  The one I saw was adjustable from 700-900 PSI and held a

 setting to within 5 PSI, and had a pull release ring on it to bleed the

 system down.  Pretty cool.  If you have the money, I would recommend

 looking into something like that.



 As for a gage... My input would be to just plumb everything with

 standard AN fittings everywhere possible and stay away from, or convert

 over from, metric.  To that end, a standard pressure gage in PSI would

 be just fine.  Just look for something say from the 0-1000 psi range.



 Mark Bitterlich

mark.bitterlich(at)navy.m
Guest

Posted: Tue Mar 31, 2009 8:52 am Post subject: Pressure relief valve

Wes, could you possibly give me a reference on the relief valve you used?  I

am VERY VERY interested!  (BIG TIME)  I really am tired of messing with the

Russian stuff. 



Mark

 



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warner.wesley(at)gmail.co
Guest

Posted: Thu Apr 02, 2009 5:18 am Post subject: Pressure relief valve

Mark,

  It looks like I gave all the paperwork to the buyer of my old plane.

 However, using my marginal memory, I located the valve...



http://hylokusa.thomasnet.com/item/rv-series-relief-valves/relief-valve/pn-5069?&plpver=10&assetid=g1001



In case the link doesn't work, it's a Hy-Lok RV2MF-4N with the Yellow

spring.  (It might have been the purple spring run all the way out.

I'll try to find out for sure.)



(Disclaimer) I would verify with the distributor the correct pressure

range etc... before ordering.



I used two of them on a Yak 55M and had great success.



Let me know if I can help with anything else.



Wes



On Tue, Mar 31, 2009 at 12:50 PM, Bitterlich, Mark G CIV Det Cherry

Point, MALS-14 64E <mark.bitterlich(at)navy.mil> wrote:

[quote] Wes, could you possibly give me a reference on the relief valve you used?  I

 am VERY VERY interested!  (BIG TIME)  I really am tired of messing with the

 Russian stuff.



 Mark

 --

mikspin

Joined: 12 Aug 2007
Posts: 66

Posted: Thu Apr 02, 2009 10:54 am Post subject: Re: Pressure relief valve

Henry,



Are you using the original Russian relief valve? Kimball's setup? (which is a readily available Parker brand valve), another setup per the Moose community?



Don't mean to pry, but the Parker stuff allows for a different way of relief than the Russian stuff or the type of valve Wes has shown (which I think is pretty slick in itself).



Don't mean to bury you with extraneous data, but I've found some other options from some valve manufacturers (in stainless with your choice of standard pipe threaded inlet sizes and cfm ratings, 12 or 24V); a couple brands are  Sejn and Noshok.



The operational mode of these valves could be for relief, unloading for the compressor, or a combination of both.



Mike Hastings

warner.wesley(at)gmail.co
Guest

Posted: Thu Apr 02, 2009 11:42 am Post subject: Pressure relief valve

Mike,

  Just an FYI.  The valves I used were for emergency pressure relief

only.  I also had an, "Unload" valve that I would open after the

pressure built back up after a start.



Wes



On Thu, Apr 2, 2009 at 2:54 PM, mikspin <acromike(at)gmail.com> wrote:

 	  Quote: 	
		   



 Henry,



 Are you using the original Russian relief valve? Kimball's setup? (which is a readily available Parker brand valve), another setup per the Moose community?



 Don't mean to pry, but the Parker stuff allows for a different way of relief than the Russian stuff or the type of valve Wes has shown (which I think is pretty slick in itself).



 Don't mean to bury you with extraneous data, but I've found some other options from some valve manufacturers (in stainless with your choice of standard pipe threaded inlet sizes and cfm ratings, 12 or 24V); a couple brands are  Sejn and Noshok.



 The operational mode of these valves could be for relief, unloading for the compressor, or a combination of both.



 Mike Hastings





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p 37407#237407

eddiemoranii(at)yahoo.com
Guest

Posted: Thu Apr 02, 2009 4:04 pm Post subject: Pressure relief valve

I think Doug Sapp of Omak, WA. has a great air system.  I am extremely  happy with it.



Eddie

--- On Thu, 4/2/09, mikspin <acromike(at)gmail.com> wrote:

 	  Quote: 	
		  

From: mikspin <acromike(at)gmail.com>

Subject: Re: Pressure relief valve

To: m14pengines-list(at)matronics.com

Date: Thursday, April 2, 2009, 2:54 PM



--> M14PEngines-List message posted by: "mikspin" <[url=/mc/compose?to=acromike(at)gmail.com]acromike(at)gmail.com[/url]>



Henry,



Are you using the original Russian relief valve? Kimball's setup? (which is a readily available Parker brand valve), another setup per the Moose community?



Don't  mean to pry, but the Parker stuff allows for a different way of relief than the Russian stuff or the type of valve Wes has shown (which I think is pretty slick in itself).



Don't mean to bury you with extraneous data, but I've found some other options from some valve manufacturers (in stainless with your choice of standard pipe threaded inlet sizes and cfm ratings, 12 or 24V); a couple brands are  Sejn and Noshok.



The operational mode of these valves could be for relief, unloading for the compressor, or a combination of both.



Mike Hastings





Read this topic online here:



http://forums.matronics.com/viewtr?M14PEngines-List" target="_blank">http://www.matronics.com/Navigator?M1sp;              - MATRONICS WEB FO                     &nbsf="http://www.matronics.com/contribution" target="_blank">http://www.ma======================





	


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