Richter GUT/F Series Overflow Valves - Manual (Page 10)

Series GUT/F
Page 10
9530-071-en Revision 10
TM 8361 Edition 10/2011
7 Operation
7.1 Initial commissioning
Normally, the valves have been tested for leaks with
water.
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, all connection screws should be
retightened after the initial loading of the valve with
operating pressure and operating temperature. See
Section 9.3.
7.2 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 the start of maintenance work, the valve
must 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 6.4.
7.3 Recommissioning
When recommissioning the valve, make sure that all
the appropriate steps as described in Section 6.1 to
6.7 and Section 7.1 are repeated.
7.4 Improper operation and their
consequences
Fig. 7
The test pressure, checked by the manufacturer,
an approved authority or the supervisory company
responsible is secured against unauthorised ad-
justment by a lead seal.
A broken lead seal must be replaced without delay.
This can either be done by the manufacturer, the
approved authority or the supervisory company
responsible.
It is emphasised that in the case of the
operating company adding the lead
seal itself, it automatically assumes
full responsibility for any operational hazard
and resulting damage.
The travel set at the manufacturer's works ensures
reliable operation of the valve. It is forbidden to
arbitrarily alter the travel or to totally block the
valve.
During operation of the valve, no hard foreign
matter may be found between the seat and the
plug of the valve.
If foreign matter is deposited on the sealing
surfaces during reseating of the valve, the valve is
probably not tight. Damage may also occur to the
plastic sealing surfaces.
Lead seal