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+--- Thread: ShurFlo 5.7 (/showthread.php?tid=7383)
ShurFlo 5.7 - Pete Masterson - 02-15-2009 11:21
Just from the standpoint of simplified plumbing, I'd just as soon run with a single pump -- and, if I was concerned about a breakdown, carry a spare to "swap in" if necessary.
Pete Masterson
'95 Blue Bird Wanderlodge WBDA 42 (For Sale)
El Sobrante CA
"aeonix1@mac.com"
On Feb 15, 2009, at 2:27 PM, timvasqz wrote:
One problem with a two pump system is both pump heads must work for
any one to make pressure. if one pump fails and it is not an
electrical failure, the valve in the pump fail open and let water
cycle thru that path backwards to the tank. <snip>
ShurFlo 5.7 - Ryan Wright - 02-16-2009 08:10
Oh, this is an easy, easy solution. Water line from tank splits into
both pumps. Output from both pumps each goes into a one-way valve,
then splits back to a single line to feed the coach faucets. Now you
can run either pump any time and the valve on the opposing pump's
output will prevent water from going back through it.
I did this all the time when I was into reef aquariums. One-way valves
are cheap and work great. The plumbing on this isn't complicated at
all and the convenience of not having to interrupt a family vacation
for a couple of hours to swap out a pump will be well worth it.
-Ryan
'86 PT-40 8V92
On Sun, Feb 15, 2009 at 2:27 PM, timvasqz
> One problem with a two pump system is both pump heads must work for
> any one to make pressure. if one pump fails and it is not an
> electrical failure, the valve in the pump fail open and let water
> cycle thru that path backwards to the tank. using a backup pump in
> this situation is the same as running a pump with the fill switch
> open. It would be necessary to block the failed pump path at either
> end to keep the water from the good pump from making its way back at
> the tank.
>