Quote:
Originally Posted by NavyLCDR
Since probably 99+% of RV water pumps draw water from a vented freshwater tank which is located below the water pump, 99+% of RV water pumps will actually have a negative inlet pressure (slight vacuum). I don't know of any RVs that have pressurized freshwater tanks so there is nothing to regulate on the inlet side of the pump.
City water will tap into the plumbing system on the outlet side of the water pump. Most RV water pumps have pressure switches set in the 55 PSI range which is what the water pump will pressurize the outlet side to. It's recommended to set city water pressure regulators to the same PSI as the shutoff switch of the water pump and to leave water pumps switched off when connected to city water.
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That's nice and all; but, the solution can be found in a typical RV plumbing diagram and pump specification. The 12v pump can see line pressure and from the specification "Inlet pressure must not exceed 30 psi [2.1 bar] maximum...."