International Water & Irrigation

12 100 Series is at the leading edge of this trend. This innovative line of engineered plastic control valves provides unique benefits & features compared to other standard control valves. 100 Series h Y flow NEW es is th ea. dent , Double Chamber Valve Benefits and Advantages • Isolated and protected diaphragm - The inherent separation partition that actually creates the lower control chamber also separate it from the dynamic flow both in the single chambered and in the double chambered configurations. In the single chamber configuration the separation partition provides mechanical protection to the diaphragm. In the double chamber configuration the separation partition protect the diaphragm mechanically and hydraulically. This protection lowers the risk for diaphragm wearing & distortion by particles that exist in the water. • Opening at exceptionally low pressure- Exposing the lower chamber to the atmosphere eliminates the need for a spring to act as a driving force for closure. Therefore the required line pressure for opening the valve is lower than the line pressure needed for opening a single chambered valve. • Lower head loss - The fact that closing spring is not required, minimize the head loss across the double chamber valve compare to a single chamber valve. Double chamber valve combined with 3-Way controls will react faster than a single chamber valve, even in case of full opening of the valve. Therefore by combining 3-Way controls and double chamber valve one can benefit twice: lower head loss and faster valve reaction time. • Higher tolerance for water quality - The ideal combination of double chambered valve with 3-Way controls result in a valve which is less sensitive to poor water quality. That is because the diaphragm is protected from particles in the water and because the 3-Way controls requires less water for control. • Immediate valve response - Looking on the hydraulic forces inside the double chamber valve, we can understand that there is equilibrium of forces acting on the seal area and there is no opening hydraulic force acting on the lower control chamber, so ultimately the only active hydraulic force is applied as closing force on the upper control chamber of the valve. That is different from a single chambered valve and makes the valve closing response immediate. • Excellent closing mechanism - The IR-100-DC valves offer smooth and responsive closing performance in compare to single chambered valves. • Double chambered valves are characterized with a higher closing force providing quick accurate and immediate valve reaction to changes in hydraulic conditions • At the end of the closing process, the valve lands smoothly on the seat, ensuring safe, surge-free closing. • If applying external control pressure (for example in the application of remote irrigation valves), the control pressure can be 20% lower than the line pressure. • Variety of control options The ability to command actively and passively both of the control chambers (upper and lower) separately or in parallel, make it possible to answer different needs for different applications. For example: • Normally opened or normally closed valve • Fail safe open or close valve. • Check valve or drain valve - by adding a spring to one of the control chambers. • On-Site Flexibility The double chamber actuator can be easily converted to single chamber by externally connecting the lower chamber to the downstream using a control tube. If there is a single chambered valve at site, it is very easy to replace it with a double chambered valve. Double Chamber Valves typical applications Natural Non-Return Valve Proportional Pressure Reducing Valve • Reservoir Level Control Valve • Distribution Line Flush-'n- Stop Valve. www.bermad.com