Matronics Email Lists :: View topic

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

CJ-6 PRV

Matronics Email Lists Forum Index -> Yak-List

View previous topic :: View next topic

Author Message

shankeroid(at)verizon.net
Guest

Posted: Wed Nov 05, 2008 5:23 am Post subject: CJ-6 PRV

The Press Regulating Valve on my  CJ is only "hissing" when pressure gets to 45 ATM and doesn't "pop"  smartly.  it allows overpressure on a long flight or when serviced with a  Scuba bottle.  I've had the spring/piston combo removed and cleaned,  reinstalled and then adjusted the PRV with the same results.  Sound like it  needs a new spring/piston?

     Next question:  Are the Yak  and CJ PRV innards identical?  Last time I checked Doug did not have the  parts but Jill does.....neither is sure they are interchangeable.

     Also, can just the rubber tip on  the piston be replaced without having to get the whole brass/rubber  combo?

  

 Thanks.

  

 Jim Shanks

 shankeroid(at)verizon.net (shankeroid(at)verizon.net)

  

  

     

   [quote][b]

- The Matronics Yak-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List

dougsappllc(at)gmail.com
Guest

Posted: Wed Nov 05, 2008 5:46 am Post subject: CJ-6 PRV

Jim,

 I have been told that they should be changed in pairs if you are goinf from a 52 into a CJ or visa versa.  In my stock I do have the brass valve but no springs at this time, I also have the complete pop off valve factory new for $85.00.  

   

  

  

 Doug

 On Wed, Nov 5, 2008 at 5:23 AM, Jim Shanks <shankeroid(at)verizon.net (shankeroid(at)verizon.net)> wrote:

  	  Quote: 	
		        The Press Regulating Valve on my CJ is only "hissing" when pressure gets to 45 ATM and doesn't "pop" smartly.  it allows overpressure on a long flight or when serviced with a Scuba bottle.  I've had the spring/piston combo removed and cleaned, reinstalled and then adjusted the PRV with the same results.  Sound like it needs a new spring/piston?

      Next question:  Are the Yak and CJ PRV innards identical?  Last time I checked Doug did not have the parts but Jill does.....neither is sure they are interchangeable.

     Also, can just the rubber tip on the piston be replaced without having to get the whole brass/rubber combo?

  

 Thanks.

  

 Jim Shanks

 shankeroid(at)verizon.net (shankeroid(at)verizon.net)

  

  

     

 	  Quote: 	
		  



	


	


-- 

Always Yakin,

Doug Sapp

Phone 509-826-4610

Fax 509-826-3644

  [quote][b]

- The Matronics Yak-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List

dsavarese0812(at)bellsout
Guest

Posted: Wed Nov 05, 2008 5:48 am Post subject: CJ-6 PRV

The reason it is "hissing" is because the break  over pressure has been reached.  It's not really necessary for it to  pop.  As long as it regulates the pressure properly by opening at the  preset pressure, it should be just fine.  The real issue is at what point  does it stop "hissing" or at what pressure does it stop once the PRV  opens?  You can adjust the pressure relief point by turning the "top hat"  in or out and then locking it back down with the jam nut.

  

 If I am not mistaken someone on the list said the  pistons were not interchangeable.  However, Jill does have replacement  piston seals.  They will not last as long as an original piston seal  will.  It's the durometer of the rubber in the new piston  seal.

 Dennis

 [quote]   ---

- The Matronics Yak-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List

keithmckinley

Joined: 11 Aug 2008
Posts: 434

Posted: Wed Nov 05, 2008 12:24 pm Post subject: Re: CJ-6 PRV

Jim,



The link below is a thread on this list that was on this very subject. It may help you out.



Keith

700HS



http://forums.matronics.com/viewtopic.php?t=49923

- The Matronics Yak-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List

mark.bitterlich(at)navy.m
Guest

Posted: Wed Nov 05, 2008 1:36 pm Post subject: CJ-6 PRV

Ok, I explained this poorly last time... Let me try again please.  My

bad.  



The piston diameter and length is identical between CJ and YAK, with the

exception of the YAK-52TW and MAYBE the 52W.  Not sure about the 52W.

This means that the piston, the piece with the rubber on top.... Is

completely interchangable between CJ's and YAKS.  



The spring used with the CJ has less turns with a larger diameter coil

wire.  The YAK uses more turns with a slightly smaller diameter coil

wire in the spring itself.  The overall LENGTHS of the two springs are

different and that is important.  



It is possible to interchange springs and pistons, but I had some

unusual results when I did that and was unable to adjust the air

properly.  I then discovered that the CAP... The part that you turn in

to adjust the pressure, (Top Hat, CAP, whatever it is called) is

different between the CJ and the YAK.  That is why the springs are

different between the two as well.    



I really did not explain this properly in my last posting and I

appologize for being too vague.  Fact is, it took me going back to look

at the whole mess again to remember exactly what was going on.  



So here we go... Hope this not too confusing. 



1.  The pistons are identical in both models.  

2.  The springs are not, as described above. 

3.  The part that screws down and adjusts the pressure is different

between the CJ and the YAK ... HOWEVER, the CJ part will screw right on

the YAK valve body AND vice versa.  



The top hat, or screw on part...the part that adjusts the pressure has a

different overall LENGTH between the CJ and the YAK.  If I remember

correctly the CJ Top Hat is SHORTER.  Thus the SPRING is shorter too.  



So, you can put in a new piston from either CJ or YAK and interchange

freely as long as you use the original spring.  



If the original spring is worn out, or you suspect that, and you use the

new CJ spring , then you need to use a new CJ top hat and vice versa.   



Springs rarely go bad.  



Yes, you can replace just the rubber tip, but I have NEVER had it work

as well when I have tried that.  



Mark Bitterlich



P.s.  My valve only "hisses" as well.  When it was brand spanking new it

would "pop", now it hisses.  Still works though, but is very very

sensitive to adjustment. 



P.p.s.  Sorry for screwing this explanation up last time.  

 



--

- The Matronics Yak-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List

Display posts from previous:

	Matronics Email Lists Forum Index -> Yak-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum