What are the two principal types of throttling valves used in a water system?

The two principal types of throttling valves used in a water system are pressure-reducing valves and altitude valves. Pressure-reducing valves are designed to automatically reduce the inlet pressure to a desired lower outlet pressure, allowing for controlled water flow, which is essential in maintaining system integrity and preventing damage from excessive pressure. Altitude valves, on the other hand, are utilized to control the water levels in tanks or reservoirs, activating when water reaches a certain height to either fill or drain the system accordingly.

Both types of valves are critical for controlling pressure and flow in a water distribution system, ensuring safety and efficiency in operations. They help in maintaining optimal functioning within the system by managing pressure fluctuations and thereby protecting valuable infrastructure.