Richter GU/F Series Overflow Valves - Manual (Page 12)

Series GU/F
Page 12
9530-070-en Revision 00
TM 6908 Edition 10/2007
7 Operation
7.1 Initial commissioning
Normally, the valves have been tested for leaks with
air or 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 medium.
Following the initial loading of the valve with operating
pressure and temperature, the torques of all
connecting bolts must be checked.
See Section 1.3.
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 emtied.
Prior to starting any repair work, the valve is to be
thoroughly cleaned. Even if the valve has been
properly emtied 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 6.4.
7.3 Recommissioning
When recommissioning the valve, make sure that all
the appropriate steps as described in Section 6.1 to
6.6 and Section 7.1 are repeated.
7.4 Improper operation and their
consequences
Fig. 8
The test pressure, checked by the manufacturer,
an approved authority or the supervisory company
responsible is secured against unauthorised
adjustment 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.
The missing plug 982/1 may result in moisture and
dirt in the valve. Replace plug.