A pressure-reducing valve is a self-operating valve that is used to reduce any excess pressure in a system. Sometimes this valve is also known as pressure reducing regulator. The basic function of pressure-reducing valves is to reduce higher pressure into lower. They are commonly used in water, steam, and oil & gas industries. A Pressure Reducing Valve can be defined as a self-acting automatic control valve for reducing a higher unregulated inlet pressure to a constant, reduced outlet pressure regardless of the fluctuations in the upstream water pressure. Functions of Pressure Reducing Valves A pressure-reducing valve is able to control pressure through the fully automatic self-contained operation without the necessity of an external power source. The main functions of a pressure-reducing valve are: • In steam systems, pressure-reducing valves are used to get precise control of downstream pressure. These valves automatically adjust the valve opening and adjust the pressure to keep it constant during pressure fluctuations. • Properly selected pressure-reducing valves can be used for water hammer protection under defined conditions. • They can also be used as bypass valves for saving the system during power failures. • Pressure-reducing valves are capable of taking rapid action by immediate sensing and adjusting based on the downstream pressure.