Irrigation system having ground moisture responsive control jar valve regulation

An irrigation control system for regulating fluid flow to a plurality of individual spray heads;

• wherein the improvement comprises:
• a source of irrigation fluid;
• a plurality of spray heads in fluid communication with said source of irrigation fluid;
• an irrigation fluid flow controller for each individual spray head, said controller including an individual control valve for regulating the flow of irrigation fluid to the spray head and a ground moisture regulated control means for closing said individual control valve when sufficient ground moisture is present in the vicinity of the controller to shut off the flow of irrigation fluid to the spray head;
• said individual control valve having a fluid inlet fluid communication with said source of irrigation fluid;
• a fluid outlet in fluid communication with at least one of said spray heads;
• a valve seat formed at a distal end of said fluid inlet;
• a valve chamber;
• a valve closure member in said chamber biased in a normally open position away from said valve seat whereby in said open position irrigation fluid is permitted to flow through the valve between said fluid inlet and said fluid outlet;
• a fluid conduit between said fluid outlet and said ground moisture regulated control means;
• said ground moisture regulated control means including a fluid chamber in fluid communication with said fluid conduit and said valve chamber, said fluid chamber having a slow release outlet for regulating the amount of fluid in said fluid chamber;
• the rate of release of said slow release outlet being controlled by the moisture content of the surrounding soil;
• said fluid chamber, when filled with fluid from said fluid outlet through said fluid conduit by being in fluid communication with said valve chamber, creates a pressure, causing said valve closure member to engage the valve seat and close the valve, cutting off the flow of irrigation fluid to the spray heads.