What purpose does a drain valve serve in an irrigation system?

A drain valve is an important component in an irrigation system primarily designed for expelling water from the irrigation lines after the system has been used. This function is critical, especially in climates where freezing can occur. By draining the water out, it prevents the water from freezing and causing damage to the irrigation system, such as bursting pipes or fixtures.

Additionally, draining water can help to prevent stagnation and potential damage from algae or other growths developing in standing water. Properly managing water within the system not only prolongs the life of the equipment but ensures efficiency during the subsequent uses when the system is reactivated.

While filtering water, regulating pressure, or connecting two sections of piping are all possible functions or components in an irrigation system, they do not specifically address the unique purpose of maintaining the integrity and functionality of the system through water removal, which is the key role of a drain valve.