Gravity Nozzle - a low pressure irrigation emitter

Gravity Nozzle – Adjustable Low-Pressure Irrigation Emitter

The Gravity Nozzle is an adjustable emitter designed specifically for gravity-fed irrigation systems with very low water pressure. It fits the most common micro tubing sizes (1/4" / 4 × 6 mm hoses), is infinitely adjustable, and can be easily 3D printed without supports.

The Gravity Nozzle was designed to work perfectly with OpenValve, a 3D-printable and open source irrigation controller made for gravity fed sytems.

A water container elevated by 1 meter produces only about 0.1 bar of pressure. Most standard irrigation emitters are designed for much higher pressure, which means they often perform poorly or unpredictably in gravity-fed setups.

This nozzle is made to work reliably at low pressure and allows the water flow to be adjusted directly at the emitter.

Adjustable Flow

The Gravity Nozzle can be adjusted continuously from fully closed to maximum flow. The full useful adjustment range is within approximately one full turn.

Opening the nozzle further than one turn is possible, but it will not significantly increase the flow beyond about 400 ml/min at 0.1 bar.

Flow Performance at 0.1 Bar

0.1 bar is approximately the pressure you get from a water container positioned 1 meter above the emitter.

Print Settings

• Layer height: 0.2 mm

• Recommended materials: PETG or ASA

• Support: none

PETG and ASA are recommended because they are more suitable for outdoor and water-contact use than PLA.

Notes

Flow rates may vary slightly depending on print quality, material, and setup. Container elevation will significantly affect the flow rate.