vacuubrand MD 4C NT, Инструкция по эксплуатации

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page 46 of 80
Pumps with flow control diaphragm valve:
Use the flow control diaphragm valve (14) at the pump
inlet to control the pumping speed. Open flow control dia -
phragm to pump down.
➨
Opening the flow control diaphragm: Turn counter -
clockwise. Do not attempt to open the valve further
than when resistance is first encountered.
➨
Closing: Turn clockwise. Close flow control diaphragm
valve slightly hand-tight. Further tightening will not in-
crease sealing of the valve, and may lead to damage.
Note : Over-tightening or -loosening may damage the dia-
phragm or the valve seat, and the valve may not close
properly thereafter.
Replace diaphragm in case of leaks.
Important notes regarding the use of gas bal-
last
Gas ballast is a continuous purge to keep the pump’s in-
terior as clean as possible and to reduce the possibility of
condensation inside the pump.
➨
Oxygen enters the pump if using air as gas ballast.
➨
Air and pumped media might react inside the pump or
at the outlet of the pump and form hazardous or explo-
sive mixtures, when you use air rather than inert gas
for the gas ballast. This constitutes a risk of significant
damage to equipment and/or facilities, a risk of per-
sonal injury or even loss of life.
+
Make sure that air/gas intake through the gas ballast
valve can never lead to hazardous, explosive or other-
wise dangerous mixtures. If in doubt, use inert gas.
To reduce condensation in the pump, do not pump vapor
before the pump has reached its operating temperature.
Open the gas ballast valve when pumping condensable
vapors. Turn gas ballast cap to open valve.
NOTICE
NOTICE