2, Cares After Installation to Pipings
Check leakage :
Before operation of the valve, pressure inside the pipings
to be raised and to make sure no-leakage between the
piping-flanges and the valve. When gas used as fluid,
use soaped water for checking leakage. However,
pressure inside the pipings not to be raised beyond the
valve specifications, and set the disc of the valve in the
open position while checking the leakage. (Fig.11)
Treatment for leakage:
In case of leakage, reduce the pressure firstly, and
then tightening the flange bolt again. Tightening bolts
is doing evenly and diagonally. Unbalanced fastening
among bolts causes any eakage.
3, Other Points to be cared
Trial run (Check-up run) :
Operate the valve by manual before operating.
Cares while operating the valve with a hand wheel :
Be sure to turn the hand wheel by the hand. Do not
turn the hand wheel with a wrench or lever in order not
to cause trouble.( Fig.12)
Do not use blank flange :
Keep the valve fully opened while pressure test, etc.
Do not use the fully closed valve as a blind flange.
Cares after pipings :
Regarding motorized valve, in operating by manual hand
wheel, make sure the main power is off before operating.
After returning electric operation mode, remove the lever
and put on the main power. (Fig.12-1)
Operating more than two actuators by one switch shall
cause malfunction due to wrap around circuit. So, Operate
one by one, and also,set up the relay nterface. (Fig.12-2)
Precaution
Opening/Closing the valve in short time causes the water
hammer which may damage the valve or the other instrument.
Please contact the person in charge if you use such a way.
In case that actuator and valve is soused by corrosive
fluid directly, protect with protection cover.
In case that control valve is installed to upstream side,
vibration of turbulent may damage it, so get space
from 3D to 5D.
Fig.11
Fig.12
Fig.12-1
Fig.12-2
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