A FLUID RELEASE MEANS

摘要

At dead ends in a water reticulation system debris and dirt may accumulate. The invention uses a diaphragm valve (16) to automatically release water periodically from a dead end so as to flush out dirt, etc. A by-pass line (29, 32) is provided around valve (16). This line passes through an on-off, battery powered, timer valve (18). When the timer valve is opened, fluid flows through the by-pass line to downstream of the diaphragm valve which results in a pressure drop above the diaphragm and the water pressure upstream opens the valve (16). A pressure reducing valve (30) in the by-pass line allows timer valve (18) and check valves (20) to be of low pressure type. A needle valve or orifice plate prevents potential damage due to a rapid build up of pressure upstream of valve (16) when the latter closes.