Richter LPV/F Series Low-Pressure Safety Valves - Manual (Page 11)

Series LPV-A/F, LPV-D/F
Seite 11
9530-060-en Revision 01
TM 7464 Edition 02/2009
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.
The max. operating pressure of the plant must
always be below the safety valve reseating
pressure.
To prevent leaks, all connection screws should be
retightened after the initial loading of the valve with
operating pressure and operating temperature.
For tightening torques, see Section 1.4.
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 the valve is recommissioned, it must be
ensured that all appropriate steps, as described in
Sections 6 and 7.1, are repeated.
7.4 Improper operation and their
consequences
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.
Fig. 2
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.