I
MO-D52/R52
8
9/21 Rev. 0
Preparation for Operation and Operation
Preparation for operation
All the adjustments based on the order specification we received have been completed prior
to the delivery from our factory. However, the adjustments might be out of alignment due to
transportation or installation, check the operation of it in combined state with the on-off
control circuit or the controller after completing the installation.
•
If the actuator is equipped with accessories, do not prepare for operation on a rainy day
or in an environment subject to splash of water to avoid electric leak or deterioration of
performance.
•
For the accessories which require power supply, before turning on the power, check that
the power supply voltage is equivalent to the voltage displayed on the name plate of
devices. If not, adjust the voltage to the value on it.
•
Use dry and clean instrument air for the operation source of the actuator, and check that
its air-pressure does not exceed the setting air-pressure indicated in the specifications.
When you change it, please contact Koso America.
•
Check that no air leaks from the joint portion of the instrument air piping and the
diaphragm clamping section (the actuator circumference). If any leakage is found,
follow the instructions in the “Disassembling the actuator” section to stop it.
(1)
Adjustment of accessories:
When an adjustment is required for accessory, follow the instructions in the operation
manual for each device for adjustment. Use a dial gauge or a stroke detector equivalent
to it to detect a stroke for adjustment of the positioner.
(2)
Adjustment of actuator off-balance (See Fig.12 for the encircled parts numbers)
This off-balance does not get out of order during transportation, storage, or
installation. However, when the actuator is separated from the valve body for the
convenience of installation work, follow the procedures shown below to adjust.
•
Prepare an air-pressure reducing valve and a pressure gauge equivalent to ASME
B40.100 class.
•
Check the spring range and supply air pressure shown on the nameplate attached
to the control valve.
•
Keep the hex socket head screw 131, the connector 112 and the indicator 137 in
the same disassembled state as they are when the actuator is separated from
the valve body.
•
Close the valve body stem 5.
•
Apply the specified air-pressure through the instrument air connection port of the
actuator with using the air-pressure reducing valve and the pressure gauge
equivalent to ASME B40.100 class.
(a)
Direct action actuator (the valve closes when the instrument air-pressure is
increased.)
Apply the air-pressure, which is the maximum value of the spring range.
Lower the valve body stem so that the plug contacts the valve seat.
Engage the connector with the threaded portion of the actuator rod 106
and that of the valve stem and fix them firmly with the hex socket set
screws. If they do not engage well with each other, slightly decrease the
air-pressure from the maximum value of the spring range and engage them
again.
