Pressure reducing valves (PRV) and pressure regulator valves (PRV) are two different types of valves used in plumbing and HVAC systems to control and maintain the pressure of water or air flowing through the system.
A pressure reducing valve is a valve that is installed in a water supply line, usually next to the water heater, to reduce the high pressure of the incoming water to a lower, more manageable pressure that is suitable for household or commercial use. The valve reduces the pressure by restricting the flow of water and maintaining a constant downstream pressure, regardless of the fluctuations in the upstream pressure.
A pressure regulator valve, on the other hand, is a valve that is used to regulate the pressure of air or gas in a system. It works by adjusting the flow of gas or air to maintain a constant pressure at the outlet, regardless of the variations in the inlet pressure. These valves are commonly used in HVAC systems to control the pressure of the refrigerant or air flowing through the system.
In summary, while both valves serve a similar purpose of maintaining a constant pressure, a pressure regulator valve is used to regulate the pressure of air or gas, while a pressure reducing valve is used to regulate the pressure of water.