Sprinklers & drippers

The 4 l/h CNL valve needs a longer run time for the same measured water volume than the 8 l/h CNL valve. If your installed valve actually delivers 4 l/h, a total dose of 0.5 litres takes 7.5 minutes. At a measured 8 l/h, it takes 3.75 minutes. This calculation applies to the valve and is not a watering recommendation per plant.

Choose the flow rate together with your timer settings and check that the substrate absorbs the water. With a multi-outlet distributor, measure each outlet separately before setting the run time.

A multi-outlet distributor divides the flow from one valve between several tubes. Do not apply the nominal valve rating to every outlet or plant. Check the assembled distribution with separate collection cups over equal measuring periods. An opening pressure of 1.2 bar is not a complete operating range or a sufficient basis for pump selection.

Capillary flow depends on conditions including tube length and pressure. A 120 cm capillary with a nominal 2 l/h rating does not deliver that amount under every condition. A measurement at 1 metre and 0.5 atmosphere cannot be applied directly to a different tube length. Measure your installed tube before setting a watering time.

Tube size, punch size and connector size describe different connection points. The loose 3.2 mm tube is a different component from a 25 mm supply pipe. The BE stake is intended for capillary tubing; the Ray Jet spray stake has its own available tube with an elbow. Check each connection before combining components.

A high pump capacity in litres per hour does not prove that enough pressure remains at the final outlet. Pipe length, elevation, connectors and filter resistance affect the setup. Check pressure during operation and match filtration to the exact component. Avoid one universal run time for every pot.