4
Type OSE
OPERATION
The pressure of the zone to be protected (generally the pipe
line on the outlet side of the pressure regulator and situated
after the slam shut valve) activates the safety manometric
box BMS.
If pressure rises above the release set point the release
relay frees the valve plug (key 7).
Through the action of the weight of the valve plug, the
closing spring and the
fl
uid (attempting to close), the valve
plug will seat into the ori
fi
ce (key 6).
The gas
fl
ow is obstructed until the mechanism box is
manually rearmed.
To reopen the valve plug an equal pressure balance on inlet
and outlet sides is required.
The mechanism box is rearmed after opening the internal
bypass (key 1).
Rearming and balancing are achieved at the same time.
INSTALLATION
!
AVERTISSEMENTS
All interventions on the equipment should
only be performed by quali
fi
ed and
trained personnel.
C51
Figure 4
. Type OSE LS - Principle of Operation
The slam shut valve is installed on the
inlet side of the regulator, on the horizontal
pipeline. The mechanism box should be
situated on top (see above schematic) or on
top for versions DN 25-50-80.
Installation according to EN12186 is recommended.
Install according to direction of the
fl
uid
fl
ow
(see arrow).
When assembling with adjacent elements,
care must be taken not to create pressure
force on the body and the assembling
elements (bolts, O-rings,
fl
anges) should be
compatible with the geometry and working
conditions of the equipment.
If the case arises a support must be used to
avoid pressure force on the body (a support
can be installed under the
fl
anges).
Connect the safety manometric box (IS) to
the impulse at 4D on the outlet pipe.
It is recommended to install an isolation
valve (R1) and an atmospheric valve (R2), which
can be useful for tripping and veri
fi
cations.
No modi
fi
cation should be made to the
structure of the equipment (drilling, grinding,
soldering ...).
Verify that the inlet side is protected by an
appropriate device(s) to avoid exceeding the
limits of utilization (PS, TS).
