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Diagnose the symptom first. Before touching the wiring, confirm the fault is electrical. Put the valve in the half-open position and jog the actuator. If it rotates opposite to the command, stop immediately and isolate the power. Direction must be verified at half-open, before any limit switch is set.The main Butterfly Valve product names of China Butterfly Valve Network include:Electric Speed Control Butterfly Valve,Electric Vacuum Butterfly Valve,Electric Ventilation Butterfly Valve,Electric Serrate Regulate Butterfly Valve,Extended Hard-sealed Flange Butterfly Valve,Electric Desulfurization Wafer Butterfly Valve,Electric Desulfurization Flange Butterfly Valve,Fire Signal Butterfly Valve,Flange Soft-sealed Butterfly Valve,Flange Insulation Butterfly Valve,Flange Ceramic Hard-sealed Butterfly Valve,Flange Metal Sealed Swing Butterfly Valve.
Three-phase actuators (AC380V). A phase sequence error makes the motor run in reverse and forces the valve toward closed on an open command. The correction is to swap any two of the three power phases at the external terminals. The standard field remedy is to exchange two phases of the external power cable. After the swap, jog again to confirm direction before setting limits.
Single-phase actuators (AC220V). Single-phase motors reverse by swapping the start-winding leads relative to the run winding, not by exchanging line phases. Locate the two start-winding leads at the actuator terminal block and interchange them. Some actuator designs reverse direction by repositioning an internal connector (Y1/Y2) under the cover; the open and close control wiring is not affected.
DC actuators (DC24V). For a two-wire DC actuator, direction is controlled by polarity: positive to terminal 1 and negative to terminal 2 opens the valve; reversing the polarity closes it. If the direction is reversed, exchange the positive and negative supply wires at the actuator terminals.
Wiring diagram reference points. For a standard on-off actuator, terminals 1, 2, and 3 are the open/close control inputs, with a common terminal; feedback contacts are separate (terminals 4, 5, 6 for dry contacts). Remote actuators commonly use N1 for forward and N2 for reverse; if the action is reversed, swap N1 and N2 and, on potentiometer-feedback models, also interchange the potentiometer end leads 1 and 3 and re-calibrate 0 percent and 100 percent. Always use the diagram pasted inside the actuator cover as the authoritative reference, because terminal numbering varies by manufacturer.
After rewiring, verify three things: the valve strokes in the commanded direction, the limit switches stop the motor at the correct positions, and the feedback signal matches the actual valve position. A ten-minute wiring check resolves most “valve fault” calls before any mechanical disassembly is needed.
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