Richter SRZ-V/F Series Check Valves - Manual (Page 10)

Series SR/F, SR-B/F, SRV/F, SRV-B/F, SRZ-V/F
Page 10
9550-060-en Revision 00
TM 7173
Edition 06/2008
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. See
Section 1.2.
7.2 Improper operation and their
consequences
Crystallisation must be prevented, e.g. by heating.
In the extreme case a blockage may occur.
Operation with solids 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. Even if the valve
has been properly emptied and rinsed,
residual medium may still be found in the valve.
After dismantling, immediately protect the valve
flanges against mechanical damage with 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
exceeded by 10%.
If this also fails to stop the leak, dismantle and
inspect the valve. Flange connection body/cover is leaking
Retighten the cover screws to a tightening torque
according to Section 1.2. If this does not remedy
the leak, the recommended torques may be
exceeded by 10%.
If this also fails to stop the leak, dismantle and
inspect the valve.
Valve does not close
Are there solids between the sealing surface and
the ball/plug?
Is the sealing surface damaged?
Is the ball or plug damaged?