RV water system pressures
Modern RV's have internal water tanks and pumping systems, but
these are incompatible with city water supplies as these run at
a high pressure.
Modern RVs are equipped with pressure demand type automatic
pumps, polyethylene fresh water storage tanks, and polybutylene
water lines. These systems are designed to be operated at a
certain maximum water pressure level in the neighborhood of 35
to 45 pounds per square inch. The on-board pump has a built in
pressure switch that shuts off the power to the pump when this
pressure has been reached.
However, there is a city water connection to supply water at
home or at the RV park via a hose connection. Often, the
pressure at these facilities exceeds 80 pounds per square inch
or more, sometimes much more, in certain situations. This high
pressure can and does cause leaks to develop where none had come
before and chances are god that's when you are either out to
dinner or it's 3 in the morning. A simple device is available
and necessary for your peace of mind. A water pressure regulator
should be used whenever connecting to an outside water supply
source. This device controls the incoming water pressure to
supply a continuous and regulated 45 PSI maximum. It is
connected at the supply end of the hose to protect the hose and
the RV at the same time. You can find it at your local RV supply
store.