67 Eliminating human intervention The AV AUTOMATIC WATER FEEDING VALVE is designed as follows. Its sensor compares the water level with upper and lower water level limits for rice plant growth which are set on the sensor. Based on the results of the comparison, the sensor controls the AUTOMATIC WATER FEEDING VALVE as required through a tube connected with the body to automatically feed or stop water. FLOW RATE REGULATING HANDLE SWITCHOVER KNOB CAP NUT ELBOW AIR VALVE MANUAL SWITCHOVER VALVE To SENSOR Form SENSOR FLUSHING PISTON ROUND-HEAD SCREW BONNET SPRING SENSOR CASE WATER INLET Level reading zero, indicated by white line, corresponds to paddy field surface SENSOR CASE LID SECURED FRAME SCALE LOWER FLOAT STOPPER FLOAT UPPER FLOAT STOPPER AUTOMATIC CHANGE-OVER VALVE DIAPHRAGM BONNET MID. SECTION BODY FILTER CAP NUT RUBBER SEAT From VALVE To VALVE UPPER WATER LEVEL LIMIT ADJUSTING SCREW LOWER WATER LEVEL LIMIT ADJUSTING SCREW ・ The AUTOMATIC WATER FEEDING VALVE saves irrigation water, thus relieving water shortage. ・ The valve properly controls water supply and reduces labor. 　This in turn means that working hours are shortened. ・The valve can manually be operated to water fields, orchards, etc. ・ The valve can be used in various of applications, such as intermittent irrigation, cold-weather damage prevention, and so on. ・ The valve operates on water pressure from a pipeline without electric power. ・ The valve prevents a fertilizer and agricultural chemical agent from flowing out of fields, thus inhibiting pollution of lakes and ponds. ▼ Valve body ▼ Sensor Note : The connection of the AUTOMATIC WATER FEEDING VALVE comes in three types: Threaded End, Socket End, Flanged End (City Water and JIS standards). AUTOMATIC WATER FEEDING VALVE 50mm, 80mm(2inch, 3inch) FEATURES SPECIFICATIONS Body material Valve body: High impact Polyvinyl Chloride(HI-PVC) Nominal Size 50mm(2inch) 80mm(3inch) Operating Pressure 0.02 - 0.75MPa {0.2 - 7.7kgf/cm2} Type A 0.015 - 0.5MPa{0.15 - 5.1kgf/cm2} Type B 0.03 - 0.75MPa{0.3 - 7.7kgf/cm2} Max. Working Pressure 1.0MPa {10.2kgf/cm2} Type A 0.5MPa{5.1kgf/cm2} Type B 1.0MPa{10.2kgf/cm2} Water Level Adjustment −6cm - 12cm End Connectors Threaded End, Socket End Flanged End(conforming to City Water Standards and JIS) WORKING PRESSURE VS. TEMPERATURE AUTOMATIC WATER FEEDING VALVE ｛10.2｝ 1.0 0.5 0.0 ｛5.1｝ ｛10.2｝ 1.0 0.5 0.0 ｛5.1｝ 60 80 100 120 [150] [70] -40 -20 0 20 40 （-40） （-5） （30） （90） （105） （140） （175） （210） （250） Temperature℃（゜F） 60 80 100 120 [150] [70] -40 -20 0 20 40 （-40） （-5） （30） （90） （105） （140） （175） （210） （250） Temperature℃（゜F） HI-PVC HI-PVC Max Working Pressure MPa{kgf/cm2}[PSI] Max Working Pressure MPa{kgf/cm2}[PSI] 50mm(2inch), 80mm(3inch) Type B 80mm(3inch) Type A DIAPHRAGM VALVE BUTTERFLY BALL VALVE VALVE SWING CHECK VALVE BALL CHECK, BALL FOOT VALVE AUTOMATIC WATER GATE VALVE GAUGE VALVE STOP VALVE FEEDING VALVE ROTARY ANGLE VALVE CONSTANT FLOW ALFALFA VALVE VALVE Y-SEDIMENT NEEDLE VALVE STRAINER AIR RELEASE VALVE WAFER CHECK VALVE