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cam; rotate the cam in the direction of opening the valve to make it touch with the roller and
contact of the corresponding INCH switch, when a “click” sound from the action of the micro
switch is heard, the screw on the cam can be tightened properly (the procedures below are same as
these in 4.1.4, pay attention to the different attention).

4.1.6 One stroke of opening and closing should be applied to the valve electrically to confirm

the correctness of the control, and inspect the reliability of the tightening screw on the open and
close stroke cam. (Above adjustment refers to the adjustment of valve opening and closing stroke)

4.1.7 Dial adjustment: At either end position of the valve, loosen the screw on the dial so that

the position corresponding to the end position of valve can align with the "reference mark” on
“stroke and position indicating mechanism", and then tighten the screw.

4.1.8 The adjustment of potentiometer: At either end position of the valve, push the

potentiometer gear upwards to cause it disengage from the sector gear. Tighten the screw on the
potentiometer gear slightly; rotate the potentiometer to the position of corresponding valve (return
the potentiometer a little when it rotates to the end position). Loosen the tightening screw on the
potentiometer gear and cause it engage with the sector gear, then secure the tightening screw.

Attention should be paid to the relationship between the rotation direction of the potentiometer

during operation and the rotation direction of the output shaft. Otherwise, it would be damaged.

4.1.9 The adjustment of mechanical limit screw: if it becomes necessary to adjust the

mechanical limit screw, first is to make clear the valve positions that are restrained by either of
two screws. When the rotation direction of the valve is standard (“CLOSE” when rotating
right-hand), the screw closer to the nameplate of the electric actuator is “OPEN” limit, and
“CLOSE” limit for the other one.

After the end position of the valve is decided, adjust the screw inwards to make it contact with

the limit section on the drive shaft first, and then rotate it back by 0.5 to 1 turns.

At last, tighten the retention screw (or nut) at outside, this completes the adjustment of mechanical
limit.

Note: The limit screw is not allowed to retract too much, otherwise it will make the sector gear

of the drive shaft disengaged from the worm easily.

4.2 Comprehensive performance inspection

4.2.1 Operate the valve to open and close for a stroke manually; observe the operation condition

of the stroke control and position indication mechanism, and observe the MANUAL/
ELECTRICAL switching handle and the performance of manual mechanism.

4.2.2 Operate the valve to its full close position electrically. The stroke control mechanism

should be sensitive and meet the requirement for sealing of the valve. At this time, the indicating
lamp for the controller should be lit up, and the pointer of the opening meter should be located at
“0” position.

4.2.3 Operate the valve to its full open position electrically. The stroke control mechanism

should be sensitive and meet the requirement for open of the valve. At this time, the “OPEN”
indicating lamp for the controller should be lit up, and the pointer of the opening meter should be
located at “100%” position.

The electrical valve can be put into operation only after all above inspections are passed.

5.Additional instruction for explosion-proof type

5.1 Summary

NQB1Ex, NQB2Ex explosion-proof quarter-turn electric valve actuator and NQB1INEx,

NQB2INEx integral explosion-proof quarter-turn electric valve actuator are of explosion-proof
structure. This product is produced on the basis of GB3836.1-2010

《

Explosive atmospheres

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Part 1: Equipment

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General requirements

》

and GB3836.2-2010

《

Explosive atmospheres

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Part 2: