Drip-irrigation systems for small conventional vegetable farms and organic vegetable farms -- Figure 4. Back-flow prevention made of two ball valves and a vacuum breaker are placed upstream of the Venturi injector.

HS1144: Drip-irrigation systems for small conventional vegetable farms and organic vegetable farms

Figure 4. Back-flow prevention made of two ball valves and a vacuum breaker are placed upstream of the Venturi injector.