Richter GU/F Series, Installation And Operating Manual

Page: 13 / 28

Series GU/F
Page
13
9530-020-en Revision 15
TM 10477 Edition 05/2022
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.
To prevent leaks, all connection screws should be
retightened after the initial loading of the valve with
operating pressure and operating temperature. See
Section 1.3 .
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 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 6.4 .
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.
♦
The missing plug 982/1 may result in moisture and
dirt in the valve. Replace plug.