Richter BCV/F (ASME) Series Check Valves - Manual (Page 10)

Series CV/F, CVV/F, BC/F, BCV/F
Page 10
9550-050-en Revision 10
TM 8462 Edition 02/2012
7 Operation
7.1 Initial commissioning
Normally, the valves have been tested for leaks with
air or water. Prior to initial operation check body
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 operating medium.
To prevent leaks, retighten all connection screws after
the initial loading of the valve with operating pressure
and operating temperature.
7.2 Improper operation and their
consequences
Prevent crystallisation, e.g. by heating. In extreme
cases this may cause blocking.
Operation with solids leads to increased wear.
Operating 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 dis-
mantling the valve.
Prior to undoing the flange connection ensure,
that the plant is depressurised and emptied.
Prior to the start of maintenance work, clean
the valve thoroughly. 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 this also fails to stop the leak, dismantle and in-
spect the valve. Flange connection main body/body end piece is
leaking
Retighten body screws. See paragraph flange
connection valve/pipe is leaking".
Valve does not close
Are there solids between the sealing surface and
the ball?
Is the sealing surface damaged?
Is the ball damaged?