The Air/Vacuum Relief Valve (AVR) is designed to reliably discharge air during system start-up and allow air into the line during shutdown. The valve closes even with low water pressure and reduces water hammer. It is good practice to use an AVR for all …

This chart can help determine the spacing you need for your soil type.   SOIL TYPE SAND LOAM CLAY Emitter Distribution - Illustration of how the water is distributed in different soils. Saturation Rate in/hr .75 - 1.25 .25 - .75 .15 - .25 mm/hr 19 - 32  6 …