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

Series GU/F
Page 10
9530-070-en Revision 00
TM 6908 Edition 10/2007
A draining facility must be provided at the lowest point
in the pipe. This opening for the drainage of
condensate must be lower than the flow chamber of
the body.
Fig. 3
6.2.3 Discharge conditions and reaction
forces
At low temperatures:
Outlet lines must be protected against
freezing. This applies in particular if gas
cooling as a result of expansion is to be
expected or lines are laid outdoors.
With crystallising media:
In the case of media which tend to
crystallise, solidify or stick, appropriate
action must be taken to ensure that the
solidification process cannot take place in the inlet or
outlet lines or in the body (e.g. installed rupture disc,
insulation, heating).
With gassing media:
In the case of gassing or vaporising liquids,
adequately dimensioned flashtraps must be
located in the direct vicinity of the valve.
Reaction forces during discharge:
The pipes and their holders are to be
dimensioned so that their weight forces and
the reaction forces and thermal loads
produced during discharge can be safely absorbed.
6.3 Valve connecting dimensions
The main dimensions are contained in the sectional
drawing in Section 10.5.
6.4 Flange caps and gaskets
Contamination of or damage to the sealing surfaces is
best avoided if the protective caps remain on the
flanges until just before installation.
We recommend the installation of gaskets so that the
sealing surfaces are not damaged by the mating
flanges.
If plastic sealing surfaces can be damaged, PTFE-
lined seals with a metal inlay should be used. This
may be the case with counter-flanges made of metal
or enamel.
PTFE-lined seals are available as special accessories
from the Richter range.
6.5 Direction of flow and
installation
When the valve is being installed, the
direction of flow must be observed; it is
indicated by an arrow on the valve body.
A mix-up of the inlet and outlet will result in the
valve becoming ineffective and the bellows may be
destroyed.
Always install the overflow valve with the stem in a
vertical position.
Fig. 4