B-320-2-E
5
1.4 Operating Precautions
(1) Operating precautions to be observed
1) Do not attempt to change component parts or modify circuits of the register.
2) Do not paint out the warning label or remove warning and specification labels printed or attached to the
register. Applying a coat of paint to synthetic resin components, such as pushbuttons, may possibly
result in malfunction of the affected components by the solvent it contains.
3) Since the solenoid valve to control the operation signal of the shutoff valve installed in the flowmeter
register is of an internal pilot type, proper switching of the signal may be hindered if the supply air
pressure connected to "IN" port of the solenoid valve unit falls below 0.20MPa.
For this reason, do not use it for controlling an emergency shutoff valve or similar equipment.
4) To prevent accident possibly caused by the failure of the flowmeter counter or continuous flow valve
of this flowmeter, be sure to install a safety valve such as manual valve in the OUT side piping of the
continuous flow valve. The safety valve must be closed when the flowmeter is not in operation.
(2) About the quality of air source (fluid for actuating the shutoff valve [air, nitrogen, etc.])
(See JIS B 8370 "Guidelines to Pneumatic Systems.")
1) Avoid using compressed air that contains synthetic oil with chemicals or other organic solvent, sodium,
corrosive gas, etc. which may cause component parts failure or malfunctioning.
2) Use clean, dry air that does not condensate at operating temperatures in the environment where the
product is placed in service.
Provide an air filter at the air source (filtration accuracy 5 μm approx. or finer).
3) Supply pressure to the flowmeter register is 0.20 to 0.69MPa. Adjust the pressure to somewhere in this
range with reducing valve or similar regulator.
4) A solenoid valve to control the operation signal of the shutoff valve is incorporated in the flowmeter
register.
Large quantities of drain may cause malfunctioning of the solenoid valve and other pneumatic equipment
used besides environmental pollution. Careful considerations must therefore be made in handling of drain.
In case such handling is difficult, good practice is to provide an auto drain equipped filter.
5) Powder carbon produced from the compressor can build up on valve interior in quantities leading to
valve malfunction. To get around this problem, select a compressor oil that produces less powder
carbon and/or provide an oil mist separator.
(3) About the operating environment
In low temperature applications, due precautions should be taken against solidified or frozen drain or water
inside the solenoid valve. In a case like this, we recommend to provide a dehumidifier, such as a dryer, to
remove fluid to be drained and water content.
NOTE: The above mentioned compressed air purification equipment are available from OVAL as an option.
(4) About piping
1) Preparation for installation
Prior to installation, thoroughly remove construction debris, such as metal chips, cutting fluid, and other
foreign matter remaining in the piping system by air blow (flushing) or cleaning.
2) Wrapping the seal tape
When screwing in pipes and fittings, exercise care to preclude metal
chips produced in pipe screw-thread cutting and fragments of seal tape
from entering the valve. If thread seal tape is used, leave 1.5 to 2 threads
to remain unwrapped.
3) Before making pipe connections
Refer to the instruction manual to ensure that pipes are connected to the
right ports.
4) For air supply to actuate shutoff valve, use
φ
6 ×
φ
4 copper tubes.
(5) About maintenance and inspection
(Refer to JIS B 8375 "4- and 5-port Pneumatic Solenoid Valves".)
In order to ensure normal operation of the register, do not fail to test it by pressing the start/stop button of
the register alternately several times without flowing the process fluid. This test will indicate whether the
solenoid valve in the register works properly or not.
Wrap This Way
Leav
e Tw
o Th
read
s
Unw
rapp
ed
Seal Tape
