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Topic: leaking air valve (Read 560 times) previous topic - next topic

leaking air valve

my wet tank in rear of coach I found a air leak in this valve, It's not the remote drain it's some kind of spring valve, what is this and what does it do?
Art
1997 Prevost 40'
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Re: leaking air valve

Reply #1 –
Better Picture
Art
1997 Prevost 40'
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Re: leaking air valve

Reply #2 –
It is some kind of check valve if you touch or turn it comes out hard
Art
1997 Prevost 40'
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Re: leaking air valve

Reply #3 –
Did you try pulling or turning the knurled knob?  If doing so releases air from the tank, then it's probably some kind of safety pressure relief valve.  Doesn't look like the one on our wet tank, however.
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: leaking air valve

Reply #4 –
if you touch it or turn it leaks
Art
1997 Prevost 40'
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Re: leaking air valve

Reply #5 –
Drain your air tank and pull the valve see if there is a part number. A google search would tell you what it is.

see ya
ken
The selected media item is not currently available.ken & dori hathaway & Big Agnes
🍺1992 U300 GrandVilla WTBI #4150 FOT FBP 2011
✨6V-92TA DDEC Parlor Coach 350HP Series 92
🏁2011 Nissan XTerra Pro-4X

Re: leaking air valve

Reply #6 –
Looks like somebody replaced a relief valve with a drain valve because thats all they had.Get a relief valve at a parts store and
install it.
96 U270 BUILD 4810
85 380SL
Drummonds TN.

Re: leaking air valve

Reply #7 –
On second thought,my 96 has the drain valve on that tank but the drain is routed from the tank to a valve near the door by the
sewer drains.You can drain it easily,and the decal near the drain says to drain daily.
96 U270 BUILD 4810
85 380SL
Drummonds TN.

Re: leaking air valve

Reply #8 –
Continued Google search turned up a Haldex pressure relief valve that looks exactly like Art's photo.  The one you want is 150 psi rating in whatever pipe thread fits the tapped hole.

Pressure Relief Valves - Haldex product category
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: leaking air valve

Reply #9 –
Drained tank removed valve no part # just  08 check picture
Art
1997 Prevost 40'
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Re: leaking air valve

Reply #10 –
Is the threads 1/2 inch? if so 08 could be thread size.. Chucks post will get you the replacement no mater what the thread size is.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: leaking air valve

Reply #11 –
If it's a relief valve as it appears to be, it probably says 80 instead of 08, and it is working just as IT was designed to do, the system just wasn't designed for IT !
Dave W. (AKA Toyman )
'03, 270, 36', Build 6095, Pulling whatever I hook it to.

"Don't cry because it's over. Smile because it happened."
Dr Seuss

Re: leaking air valve

Reply #12 –
The relief valve on our wet tank is a Bendix ST-3.  That is why I didn't recognize the valve in Art's photos.  I prefer the design of the ST-3, because the spring, ball and seat are outside the tank.  I think there is less chance of corrosion, or trash obstructing the valve with the external placement of the moving parts.

Either type valve will work just fine.  Just need to be sure it opens at 150 psi.

http://www.bendixvrc.com/itemDisplay.asp?documentID=4440
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: leaking air valve

Reply #13 –
Quote from: toyman –
If it's a relief valve as it appears to be, it probably says 80 instead of 08, and it is working just as IT was designed to do, the system just wasn't designed for IT !
If so it would have been blowing off all the time.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: leaking air valve

Reply #14 –
Looks exactly like the 150 PSI relief valve on our wet tank. Napa should be able to source it easily.
Don
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Don & Tys
1999 U270 3602 WTFE #5402
Xtreme Stage 1 w/Headlight, Step Conversion, etc.
2009 Honda Fit Sport with Navi
Freedom is NOT "just another word for nothing left to lose"... with apologies to Kris Kristofferson

Re: leaking air valve

Reply #15 –
Ordered 2 on line KN31200 $25.00 for 2 free ship so I put in a 1/4 inch brass plug till they show up Thanks' 
Art
1997 Prevost 40'
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Re: leaking air valve

Reply #16 –
Yup, "pop off" valve, ours is the "bobble head" style with internal spring... also leaks a bit, will replace in a day or two.
'02 40' U320t  4010WTFS Build 6036 1 slide
Motorcade # 17841
SKP 151920
Retired truck driver
 5 million miler
Still have itchy feet for travel