A sanitary pressure reducing valve (PRV) is a tool used in industries that need cleanliness, like drug-making, to manage pressure. It has parts like a body, seat, diaphragm or piston, spring, and an adjustable knob. These parts work together to lower high pressure to a safe level as it moves through the valve, ensuring equipment and processes are protected. PRVs are important for controlling steam for cleaning, making injections, and managing gases in special containers used for growing cells. They also help avoid damage from too much pressure and make less noise when valves close. You can set the pressure on the PRV or use another device to change it.