Richter GR/F Series, Инструкция по установке и эксплуатации

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Series GR/F
Page 9
9550-025-en Revision 14
TM 10477 Edition 05/2022
7 Operation
7.1 Initial commissioning
Normally, the valves have been tested for leaks with
air or water. Prior to initial operation check cover
screws. For tightening torques, see
Section 1.2 .
Unless otherwise agreed there could be
residual amounts of water in the flow section
of the valve. This could result in a possible
reaction with the medium.
To prevent leaks, all connection screws should be
retightened after the initial loading of the valve with
operating pressure and operating temperature.
For tightening torques, see
Section 1.2 .
7.2 Improper operation and their
consequences
♦
Crystallisation may result in damage to the seat
rings or ball/stem unit. In extreme cases this may
cause blocking.
♦
Increased wear occurs in operation with solids
contents.
♦
Operation during cavitation leads to increased
wear.
♦
Non-observance of the pressure-temperature
diagram can lead to damage.
7.3 Shutdown
♦
The local regulations are to be observed when
dismantling the valve.
Prior to undoing the flange connection
ensure, that the plant is depressurised and
emptied.
♦
Prior to starting any repair work, the valve is to be
thoroughly cleaned. Medium residue may be in the
valve even if it has been properly drained and
flushed.
♦
After dismantling, immediately protect the valve
flanges against mechanical damage by using
flange caps. See also
Section 6.1 .
8 Malfunctions
♦
Flange connection ball valve/pipe is leaking
Retighten the flange screws to a tightening torque
according to
Section 1.2 . If this does not remedy
the leak, the recommended torques may be ex-
ceeded by 10%.
If it still proves impossible to stop the leak, then the
lining is damaged. Dismount valve and repair.
♦
Flange connection main body/body end piece is
leaking
Retighten body screws. See paragraph "Flange
connection ball valve/pipe is leaking".
♦
Valve does not close tight
Are there solids between the sealing surface and
the plug?
Is the sealing surface damaged?
Is the plug damaged?