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If this equipment is shipped mounted on
another unit, install the unit according to
the appropriate instruction manual.
1. Only personnel qualified through training and
experience should install, operate, and maintain
this equipment. For Y696VR Series equipment
that is shipped separately, make sure that there is
no damage to or foreign material in it. Also ensure
that all tubing and piping have been blown free.
2. This equipment may be installed in any position
as long as the flow through the body is in the
direction indicated by the arrow cast on the body. If
continuous operation is required during inspection
or maintenance, install a three-valve bypass around
the equipment.
!
This equipment may vent some gas
to the atmosphere. In hazardous or
flammable gas service, vented gas may
accumulate and cause personal injury,
death, or property damage due to fire or
explosion. Vent equipment in hazardous
gas service to a remote, safe location away
from air intakes or any hazardous area.
Protect vent lines and stack openings from
condensation and clogging.
Principle of Operation
A vacuum regulator maintains a constant vacuum at
the regulator inlet. A decrease in vacuum (increase
in absolute pressure) below the setpoint registers
on the diaphragm and opens the disk. This allows
the pressure from the higher vacuum source to pass
through the regulator and restore the vacuum to its
original setting. On the Type Y696VR, the controlled
pressure registers directly into the diaphragm casing.
The Type Y696VRM has a control line connecting the
diaphragm casing to the vacuum being controlled and
an O-ring stem seal blocking the throat allowing for
registration only through the control line connection.
Startup and Adjustment
To place the vacuum regulator in operation, slowly
introduce inlet or vacuum pressure. The unit takes
control when vacuum is established. This unit operates
within the pressure range stamped on the closing cap.
Note
WARNING
HIGHER VACUUM SOURCE
VACUUM
PUMP
CONTROL PRESSURE (VACUUM)
OUTLET PRESSURE (VACUUM)
ATMOSPHERIC PRESSURE
Figure 2. Type Y696VR Operational Schematic
Shutdown
To shutdown the unit, close the upstream shutoff valve
and then close the downstream shutoff valve to vent
the equipment properly. Next, open the vent valve
between the equipment and the nearest downstream
shutoff valve. All pressure between the shutoff valves is
released through the open vent valve.
Maintenance
Equipment parts are subject to normal wear and
must be inspected and replaced as necessary. The
frequency of inspection and replacement of parts
depends on the severity of service conditions and
upon applicable codes and government regulations.
!
To avoid personal injury, property
damage, or equipment damage caused by
sudden release of pressure or explosion
of accumulated gas, isolate the regulator
and release internal pressure before
attempting maintenance or disassembly.
Y696VR Series
VACUUM BEING
CONTROLLED
WARNING
3
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