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Types EZH and EZHSO
Working monitor installations require a Type EZH or
EZHSO main valve with a Type PRX/120 or PRX/120-AP
working pilot, a Type PRX/125 or PRX/125-AP monitoring
pilot for the upstream regulator and a Type EZH or EZHSO
with the appropriate Type PRX/120 or PRX/120-AP pilot for
the downstream regulator.
Adjusting the monitor regulator is the same as adjusting
the main regulator. Monitor setpoints are set slightly
higher than the main regulator. However, the value of this
difference cannot be determined in advance, as it depends
on the particular characteristics of each application.
The schematic from Figure 14 represents the configuration
for the DN 25, 50 and 80, for the DN 100, 150 and 200 the
schematic remains the same with the remark that a check
valve (Figure 28) must be installed between outlet pressure
and loading pressure impulse lines of the regulator and
working monitor as well.
INSTALLATION
WARNING
!
Personal injury or equipment damage, due
to bursting of pressure-containing parts may
result if this regulator is overpressured or
is installed where service conditions could
exceed the limits given in the characteristics
section and on the appropriate nameplate
or where conditions exceed any rating of
the adjacent piping or piping connections.
To avoid such injury or damage, provide
pressure-relieving or pressure-limiting
devices to prevent service conditions
from exceeding those limits. Also, be sure
that installation is in compliance with all
applicable code and regulations.
Physical damage to the regulator can break
the pilot off the main valve, causing personal
injury and property damage due to bursting
of pressure-containing parts. To avoid such
injury and damage, install the regulator in a
safe location.
Only personnel qualified through training
and experience should install, operate and
maintain a regulator.
Before installation, make sure that there is
no damage to or debris in the regulator.
Make sure that all tubing and piping are
clean and unobstructed.
14
The regulator must be installed on horizontal
pipeline. For the version with slam shut, the
release relay must be situated towards the
bottom.
Installation according to EN 12186
is recommended.
When assembling with adjacent elements
take care not to create pressure force on
the body. The assembling elements (bolts,
O-rings, flanges) 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
flanges).
Connect the actuator to the impulse plug
keeping a minimum distance of 4 x D to a
straight run of the outlet pipe.
In the version with integrated slam shut
connect the safety manometric box (BMS) to
the outlet pipe keeping a minimum distance
of 4 x D to a straight run of the pipe.
In the case of functioning class B for the
slam shut it is necessary to regularly check
the safety manometric box (BMS) diaphragm.
Connect the reject tab to the outlet pipe.
It is recommended to separate the slam-shut
impulse from that of the actuator. Do not
connect impulses on the lower generator
line.
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