9
initial adjusting of the close position so that the adjusting would be more reliable for some multi-turn valve.
The certain allowance is dependent on the valve operating experiences of customer).
b. Now observe the rotor switch 8A-8B for controlling motor power, the Fig. 17 shows No. (8) switch will
occur two cases:
1. The power switch 8A-8B is in “on” position.
2. The power switch 8A-8B is in “off” position
c. Screw in slightly the “Adjusting screw” No.(5) with a screw driver to certain degree and try to turn the
adjusting shaft No.(4), if it can be moved, this means that the intermittent gear is disengaged and adjustment
can be done.
d. The detail adjusting methods for above two cases are as follows:
First case: 8A-8B is in “ON” position, which means that power is not cut off. It is necessary to turn the
adjusting axle with a screw driver toward the direction in which the adjusting shaft (4) should be turned
during closing of the valve manually. It should be stopped until rotor of row(4) is turned for 90 so that 8A-8B
is in “OFF” position.
Second case: 8A-8B is in “OFF” position, i.e. power is cut off in advance. It is necessary to turn the
adjusting shaft NO (4) with a screw driver toward the direction reverse to the direction that it should be turned
during closing the valve to make the rotor of row (4) turned for 90 to 8A-8B “ON” position and then turn the
adjusting shaft (4) a little make 8A-8B disengaged. (The direction reverse to that of the screw driver during
adjusting).
When the above mentioned adjustment is accomplished, slightly screw out the “Adjusting screw” (5) back
anti-clock wisely until it can not be rotated. Then turn slightly the “Adjusting axle” (4) with a screw driver. If
it can’t be turned, it means that the internal gears have been properly meshed. Now adjustment of the full
close position of the valve is accomplished.
(Caution: Observe the motion of the rotor switch during adjusting to prevent the counter
mechanism from over adjusting or disorder. Screw out the “adjusting screw” NO.5 after
finishing the adjusting.)
e. Energize the actuator and inspect it:
Actuate the valve manually to its middle position. Connect power. Actuate the valve electrically to move the
valve toward close direction. When the electric actuator make the valve to the close position, 8A-8B rotor
switch can cut off power supply to stop the motor, it is ensured that the adjusting is correct.
8.2 Adjustments of valve full open position (“row 1” rotor switch adjusting)
Cut off power supply before adjusting.
a. Make the valve move toward full open direction manually. Remember the rotation direction of “Adjusting
shaft(1). Operate the valve manually to full open position and then stop it. (There should be certain allowance
from full open position to limit position for some multi-turn valves)
b. Watch the rotor switch 4A-4B for controlling the power supply for the motor, i.e the switch.
NO.4 shown in Fig 17 may be in two cases. “ON” or “OFF”.
c. Screw out the “Adjusting screw” No.5 with a screw driver to certain degree and try to turn the “adjusting
shaft” No.1. If it can be moved, this means the intermittent gear is disengaged and adjustment can be done.
d. Procedure of adjusting for the two different cases:
Refer to 8.1 “d”, but in this Procedure “adjusting axle” NO.1 and the adjusted rotor switch 4A-4B should be
used for adjusting.
(Note: Screw out the “adjusting screw” NO.5 after adjustment stroke of the actuator and inspect
it.)
8.3 Accurate adjusting
If the valve switch position is not reached after the initial adjusting, accurate adjusting should be carried
out.
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