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03-20-2017, 01:16 PM
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#1
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Junior Member
Join Date: Jul 2016
Posts: 13
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Black and Gray valves.....why not Ball valves?
Hello,
I have a 1997 holiday rambler imperial that is starting to leak even though the valves are shut all the way. I will be replacing them soon and wanted to understand why nobody seems to use a ball valve instead of the standard gates. Seems like it would be a much better seal.
I did a few searches and could not find any information surrounding ball valves for sewage on RVs. Any thoughts or explanations would really help. Thanks in advance. Tyler
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03-20-2017, 01:18 PM
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#2
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Senior Member
Join Date: Feb 2017
Location: Denver, CO
Posts: 1,522
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That would be a 3" ball valve, right? Gate valves can take up very little space.
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03-20-2017, 01:24 PM
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#3
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Senior Member
LA Gulf Coast Campers
Join Date: Sep 2016
Posts: 180
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Quote:
Originally Posted by BirchyBoy
That would be a 3" ball valve, right? Gate valves can take up very little space.
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And less expensive. And I'm not sure how well a ball valve would deal with solids. A gate valve can chop through or just push the material to the other side of the end seal.
__________________
Cheers, Jim & Sandy
'14 F150 SCrew, Ruby Red, FX4, 3.5 EcoBoost. 3.55 E locker, 5.5 bed
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03-20-2017, 01:34 PM
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#4
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Senior Member
Join Date: Jan 2015
Location: Oroville, CA
Posts: 3,133
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A 3" gate valve is about 1" thick, a 3" ball valve will be huge, 7" long. You don't have room for a 3" ball valve. Replacing the gate valves, if you have good access, is relativley easy. Be sure to get some silicone grease to lube up the rubber gaskets well. Replacing leaky sewer valves is part of the joy of RVing!
__________________
Bill, Kathi and Zorro; '05 Beaver Patriot Thunder
2012 Sunnybrook Harmony 21FBS (SQEZINN)
2007 Jeep Grand Cherokee Overland
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03-20-2017, 01:37 PM
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#5
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Senior Member
Join Date: Nov 2015
Posts: 26,689
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Gate valve........
Opens fully in one motion
When open it is fully out of flow path
Ball/Globe/Butterfly valves
While opening they restrict the flow
Ball valve when closed will have 'stuff' trapped inside ball cavity.......freeze issue and 'stuff' could dry out causing blockage
Globe valve reduces size of flow path due to design
Butterfly valve....when open it is IN the flow path/when closing it could trap 'stuff' between seat and disc
Blade valves are less expensive then other valve designs, easy to replace (4 bolts) and are simple to mfg.
Issue is some stuff can get in grove that blade slides in causing 'leaks'
Usually can be cleared by back flushing or tank flushing
Seals can get dislodged....easier to just replace valve vs removing valve and repairing/replacing seals (already have valve out---just put new one in)
Pros/cons.........blade valves for mfgs are 'CHEAPER' to produce
Major reason no ball/blade/butterfly valves available for waste tanks
(along with 'cons' mentioned above)
__________________
I took my Medication today. HAVE YOU?
Dodge 3500 w/Tractor Motor
US NAVY---USS Decatur DDG-31
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03-20-2017, 01:42 PM
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#6
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Senior Member
Join Date: Oct 2016
Posts: 113
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You probably just need a new rubber seal, my waste valve was leaking the seal was smashed from years of use, new seal and the leak was fixed
__________________
1998 National Tradewinds 7370 Cat 3126B 300HP Allison MD 3060 Freightliner XC Chassis at about 80K Miles. Burning Dinosaur Bones One Gallon At A Time
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03-20-2017, 01:54 PM
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#7
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Junior Member
Join Date: Jul 2016
Posts: 13
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Man I love the fast responses. Thank you all. I guess most of what you all have said makes sense. I just get nervous that the current type of valve will have to be replaced often, but I hope I am wrong. If everyone here says to stick with the current set up.....I will trust your advice. Thanks again.
Tyler
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03-20-2017, 02:42 PM
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#8
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Senior Member
Join Date: Nov 2015
Posts: 26,689
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Quote:
Originally Posted by MuxedUpHRI
Man I love the fast responses. Thank you all. I guess most of what you all have said makes sense. I just get nervous that the current type of valve will have to be replaced often, but I hope I am wrong. If everyone here says to stick with the current set up.....I will trust your advice. Thanks again.
Tyler
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My RV is 2007 ....OEM waste valves...still work A-OK
__________________
I took my Medication today. HAVE YOU?
Dodge 3500 w/Tractor Motor
US NAVY---USS Decatur DDG-31
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03-20-2017, 02:44 PM
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#9
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Senior Member
Vintage RV Owners Club Spartan Chassis
Join Date: Aug 2000
Location: Cedar Park, Tx.
Posts: 449
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Quote:
Originally Posted by MuxedUpHRI
Man I love the fast responses. Thank you all. I guess most of what you all have said makes sense. I just get nervous that the current type of valve will have to be replaced often, but I hope I am wrong. If everyone here says to stick with the current set up.....I will trust your advice. Thanks again.
Tyler
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If you get bored pull them once a year and lube them..they will be happy and last a LONG time. I use lithium grease or axle grease or whatever I have on hand. I'm sure they make a valve lube but I've never bothered looking for it.
__________________
1995 BlueBird BMC 37
2013 Jeep Wrangler Rubicon Unlimited
1984 BlueBird Wanderlodge FC35RB-Sold
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03-20-2017, 02:58 PM
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#10
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Senior Member
Join Date: Jan 2015
Location: Oroville, CA
Posts: 3,133
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This is the silicone grease (plumbers grease) for use on the rubber seals on your waste valves. Wal mart has it for about a buck less
Ace 1/2fl oz Silicone Grease - Faucet Grease - Ace Hardware
__________________
Bill, Kathi and Zorro; '05 Beaver Patriot Thunder
2012 Sunnybrook Harmony 21FBS (SQEZINN)
2007 Jeep Grand Cherokee Overland
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03-20-2017, 03:34 PM
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#11
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Senior Member
Winnebago Owners Club
Join Date: Feb 2017
Location: Lexington, SC
Posts: 502
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Ball valves are more restrictive.
__________________
2015 Winnebago 30T
David Gundersen
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03-20-2017, 03:35 PM
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#12
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Senior Member
Tiffin Owners Club Appalachian Campers Mid Atlantic Campers Coastal Campers Freightliner Owners Club
Join Date: Jan 2015
Posts: 1,622
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I had to replace one of mine on the road last year when a 'helper' broke a handle off.
Just drain your tanks as normal, and then manually use your hydraulic leveling jacks to tilt your coach over to the PS, so no other drainage comes out.
It's easy to unbolt both of the valves and replace them both, 20ish bucks each.
Took me a couple hours of driving to locate a replacement when it broke, probably took 15 minutes to replace it. I now carry a spare.
__________________
DaveB, Raleigh, NC
2015 Tiffin RED 33AA, w/Honda CRV
VMSpc, Magnum BMK/ARC50
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03-20-2017, 04:34 PM
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#13
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: Apr 2011
Location: SoCal
Posts: 1,512
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Quote:
Originally Posted by MuxedUpHRI
I just get nervous that the current type of valve will have to be replaced often, but I hope I am wrong.
Tyler
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28 years RVing, 3 RV's...not a single valve failure.
__________________
You don't stop playing because you grow old...You grow old because you stop playing!
2004 Itasca M30W
'20 Can Am X3 X RS Turbo RR, '85 ATC250R, '12 Husky TE310
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03-20-2017, 06:24 PM
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#14
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Senior Member
Join Date: Jun 2012
Location: The Bluegrass State
Posts: 8,886
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Quote:
Originally Posted by Old-Biscuit
Gate valve........
Opens fully in one motion
When open it is fully out of flow path
Ball/Globe/Butterfly valves
While opening they restrict the flow
Ball valve when closed will have 'stuff' trapped inside ball cavity.......freeze issue and 'stuff' could dry out causing blockage
Globe valve reduces size of flow path due to design
Butterfly valve....when open it is IN the flow path/when closing it could trap 'stuff' between seat and disc
Blade valves are less expensive then other valve designs, easy to replace (4 bolts) and are simple to mfg.
Issue is some stuff can get in grove that blade slides in causing 'leaks'
Usually can be cleared by back flushing or tank flushing
Seals can get dislodged....easier to just replace valve vs removing valve and repairing/replacing seals (already have valve out---just put new one in)
Pros/cons.........blade valves for mfgs are 'CHEAPER' to produce
Major reason no ball/blade/butterfly valves available for waste tanks
(along with 'cons' mentioned above)
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When we bought our used coach from a really nice elderly couple, they told us the black tank valve leaked a little but worked just great and that is why they kept a cap on the end. First thing I did was take the valve out in preparation of replacing it. I found a really small hearing aid battery stuck in the groove that prevented a good seal . So I removed the battery, used a little Plumber's Grease, one pair of disposable gloves and I was back in business.
BTW, I checked the battery, and it was dead dead dead
__________________
Good Luck, Be Safe and Above All, Don't Forget To Have Fun
Pete
Central Kentucky
2006 Fleetwood Discovery 35H, 2014 Honda CR-V, M&G Engineering Braking System
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