Case Study: Avocado and Mango Plantation – Kibbutz Beit Zera, Ramat Sirin, Israel 

Tailored Valve-Based Design

1. Protecting the Main Supply Line from Pressure Spikes

Due to the altitude difference, the system’s static pressure is around 9 bar. When irrigation stops or when one of the upstream plots connected to the same supply line gets turned on or off, sudden pressure surges may occur. These spikes can damage the entire network, in particular the filtration units which are sensitive to sudden pressure changes. 

To protect the downstream system, the WW-720 (8″) Hydraulically operated Pressure Reducing Valve that reduces higher upstream pressure to lower downstream pressure. The WW-720 design ensures reliable performance even on steep terrain.   

For supplementary protection from transient surges, IR-43Q Quick Pressure Relief Valve was installed downstream to the PRV. It opens and relieves excessive line pressure when it rises above the preset maximum. The response to a system pressure rise is immediate, accurate and repeatable. 

2. Regulating Pressure Along the Irrigation Lines  

To address pressure fluctuations and minimize hydraulic pressure spikes when valves open or close, BERMAD selected composite double-chamber valves from the 100-DC series, a hydraulically operated, diaphragm-actuated control valve made with robust composite materials, often used in drip and micro systems. 

The IR-120-DC was an excellent choice for this application:  

The double-chambered design provides a powerful response when going into regulation while providing soft, non-slam closing. This high-performance valve is specially designed for quick response and challenging regulation requirements. The hYflow Y-body design reduces obstructions and pressure loss. This design also allows easy in-line inspection, maintenance, and conversion between configurations. 

BERMAD’s solution also includes M10 composite electromagnetic flow meters for accurate metering,
enable precise monitoring and efficient irrigation management. 

To support air control during filling and prevent vacuum conditions during pipeline drainage, BERMAD’s C10 composite combination air valve is integrated in the system. The C10 is a high quality combination air valve suitable for a wide range of irrigation networks and operating conditions. It evacuates air during pipeline filling, allows efficient release of air pockets from pressurized pipes, allowing large volume air intake in an event of a network draining. Integrating air valves within the system enhances efficiency, saves energy, protecting the system from pressure surge. 

3. Preventing Runoff Accumulation at Line Ends  

To counter water over-accumulation at the lower zones, BERMAD recommended installing an IR-130-DC Pressure Sustaining Valve at the midpoint of the drip manifold. This valve sustains minimum required set upstream pressure and opens only when line pressure exceeds that threshold. It prevents total drainage of water downhill when irrigation stops, which minimizes puddle formation and associated agronomic damage.