Flushing valves are used to discharge water to clean out piping systems, tanks, and equipment or maintain water quality by preventing stagnation.

Flushing valves are installed on water distribution pipelines, cooling tower piping, chemical lines, hydrant lines, boilers, and storage tanks.

Flushing valves use a threaded or lever activated opening to control water release. They are opened to allow flow to flush out piping. Automatic types open on pressure differential or at set times.

Ball valves, gate valves, butterfly valves, and automatic actuated valves are common flushing valve types used in plumbing and pipelines.

Flushing valves are designed for periodic fluid discharge and usually have unrestricted flow. Other valves are for regulating continuous flow.

Flushing valves are constructed from brass, bronze, plastic or corrosion-resistant metals depending on the fluid and application.

Flushing frequency depends on usage and water quality but quarterly or monthly flushing helps prevent corrosion and microbial buildup.

Leaking, not fully opening, or not sealing indicate a flushing valve should be repaired or replaced. High pressure drop warns of blockages.

Programmable electronic valves allow flushing to be scheduled and automated. They can open on pressure, time of day, or other parameters.

Flushing should be done slowly at low pressures. Notify users of operation. Wear eye protection and close valves to prevent backflow.

Consider flow rate, pipe size, desired flush velocity, and duration of flushing needed to determine the proper flushing valve size.

Flushing valves must meet plumbing codes and standards like NSF/ANSI 61 to ensure drinking water system safety.