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The RV’s internal systems
All recreational vehicles offer a crucial benefit: the comfort and convenience of home. This is made possible by their highly sophisticated water‑supply systems. Without such systems, today’s RV travel industry simply wouldn’t be as thriving.
The water supply system and the wastewater system coexist; in fact, they can be regarded as a single integrated system. The water supply must be as convenient as at home: simply turn on the faucet, and water flows out automatically. Fresh water comes either from an onboard fresh‑water tank or from a campsite’s water‑tap connection. The in‑vehicle tank is pressurized by a 12‑volt automatic booster pump. Once you switch on the pump, it pressurizes the entire internal plumbing to 20–40 psi. When the RV is not in use, remember to turn off the pump to prevent the pump from running dry, which can cause damage. Before connecting an external hose to a campsite tap, fill the hose with water first to minimize air entering the system. Removing air from the plumbing is a simple yet essential step in water‑use procedures. Start by filling the fresh‑water tank, then activate the pump and simultaneously open all the faucets inside the vehicle until no air bubbles appear in the flowing water. This same basic procedure should also be followed when using an external water source to purge any trapped air.
Because typical household tap water systems operate at very high pressure (100 psi), when using an external water source, you must install a pressure-reducing valve to lower the supply pressure, preventing damage to the vehicle’s original water system, which is rated for 40 psi. Many new vehicle models come equipped with such a pressure-reducing valve from the factory. If your external water connection does not include a built-in pressure reducer, simply add one to the “external water hose” line.
Wastewater discharged from sinks and shower trays—commonly referred to as gray water—is typically collected in a wastewater tank, while the black water from the vehicle’s toilet is routed to a smaller black‑water tank. Most RVs are equipped with level gauges that allow users to monitor the fill levels of both the fresh‑water and wastewater tanks, facilitating timely emptying. Abroad, 88‑mm drain connectors and tubing are commonly used to convey wastewater or black water to on‑site sewage treatment facilities at campgrounds. In China, however, to date no campgrounds, rest stops, gas stations, or national parks have such treatment systems. Consequently, 19‑mm flexible drain hoses are attached directly to the wastewater tank’s drain valve, discharging waste into nearby ditches. As for black water, portable toilets or flush‑type toilets are typically employed, with the black‑water tank then being emptied at designated restroom facilities.Travel RV
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