Originally Posted by SilverToy
Hello all -
Nosing around in the nooks and crannies now that Spring has decided to spring forth. Found a ShurFlo Accumulator under the galley sink in my 92 Classic Limited. What does this "Accumulate"???? Looks like a relief? valve on top of it. Can get model number if there are variations!
Thanks for any info!
The accumulator in the plumbing system accumulates water pressure. It's a container with two chambers separated by a bladder. One side of the bladder is pressurized with a pre-charge of compressed air. (Mine says 20 psi.) The other side of the bladder is open to the water system plumbing.
When you open a tap, water initially flows from the accumulator until the pressure drops enough for the pump to turn on. As the pump runs it will then provide the flow required by the open tap. When you close the tap, the water hammer (pressure wave) will be partially absorbed by the volume of compressed air in the accumulator. After the tap is closed, the pump will continue to run until the accumulator is pressurized to the shut-off pressure setting on the pump. This will provide some volume of water in the accumulator for the next use.
One of the advantages of the accumulator is to prevent the pump from running every time a tiny volume of water is taken from the system. When the pump does turn on, it will run enough to pressurize the accumulator.
To pre-charge your accumulator, first turn off the water pump, and any pressurized hose supplying water. Then open a tap and allow all water pressure to be relieved. After the water has stopped flowing, check the pressure at the accumulator's Schrader (tire) valve. It should be adjusted to the value specified for your trailer (20 psi on mine).
Accumulators are pretty reliable devices and rarely need attention.