Global Valves - BELIMO - #24

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ENG-93001-93621-08.04-1M • Printed in Switzerland • ZSD • Subject to technical modifications BC 24 Arrangement of the operating controls on the NV..-3, AV..-3 ON M S1 1 2 S1.1 M ON S1 1 2 1 ON 1 2 ON 2 S1.2 Symbol Symbol 7.5 s/mm 4.5 s/mm T Y1 Y2 - 1 2 3 N Y1 Y2 1 2 3 Under the cover of the actuator are the terminals for connecting the lead and the S1 control device. The actuating time set in the factory is 7.5 s/mm. The actuating time can be approximately halved by adjusting the slide switch S1.1 to the "ON" position. Slide switch S1.2 determines the valve closing point. In the factory setting, the closing point is up. When a Y1 signal is present, the actuator spindle extends and the valve opens (if the closing point is in the upper position). The direction of the spindle travel can also be reversed by inverting the Y1 and Y2 wires. Functional description Arrangement of the operating controls, functional description Function Description Switch Symbol Bold type in the table means standard factory setting. Actuating time The running time for full stroke varies as a function of the nominal stroke. (The running time for a 20 mm stroke and the standard actuating time is 150 s.) S1.1 Standard Actuating time 7.5 s/mm OFF Fast Actuating time 3.75 s/mm ON Valve closing point Closing point with actuator spindle retracted or extended. The valve control path has zero fl ow (V = 0%). S1.2 Symbol Consequence Up The actuator spindle is retracted into the actuator and the valve stem is extended from the fitting. OFF Ä Y1 Down The actuator spindle is extended from the actuator and the valve stem isretracted into the fi tting. ON �Þ Y1 7.5 s/mm 3.75 s/mm