Emerson Y690VB Instruction Manual
Instruction Manual
Form 5465
December 2009
Y690VB Series Vacuum Breakers
Introduction
Scope of the Manual
This manual describes and provides instructions
and parts lists for Types Y690VB and Y690VBM
vacuum breakers. Instructions and parts lists for other
equipment used with these breakers are found in
separate manuals.
Product Description
The Y690VB Series vacuum breakers are used for
precise control of small capacity, low-pressure service
applications where an increase in vacuum must be
limited. These direct-operated vacuum breakers come
in NPS 3/4 and 1 (DN 20 and 25) body sizes and
have an 1/4 or 1/2-inch (6,4 or 13 mm) orice. The
individual products are described as follows:
Type Y690VB
W7292
Figure 1. Type Y690VB Vacuum Breaker
Y690VB Series
The Type Y690VB is a vacuum breaker with internal
pressure registration requiring no downstream
control line.
Type Y690VBM
The Type Y690VBM is a vacuum breaker with a
control line connection and a throat seal for external
pressure registration.
Specications
Specications section gives some general ratings
and specications for the Y690VB Series vacuum
breakers. Individual breakers come from the factory
with the specic data stamped on the nameplate.
Installation
Warning
!
Personal injury, property damage,
equipment damage, or leakage due
to escaping gas or bursting of
pressure-containing parts may result if
this equipment is overpressured or is
installed where service conditions could
exceed the limits given in Specications
section, or where conditions exceed any
ratings of the adjacent piping or piping
connections. To avoid such injury or
damage, provide pressure-relieving or
pressure-limiting devices (as required
by the appropriate code, regulation,
or standard) to prevent service
conditions from exceeding those limits.
Additionally, physical damage to this
equipment could cause personal injury
or property damage due to escaping
gas. To avoid such injury or damage,
install the equipment in a safe and well
ventilated location.
Equipment operation within ratings does not preclude
the possibility of damage from debris in the lines
or from external sources. This equipment should
be inspected for damage periodically and after any
overpressure condition.
www.sherregulators.com
D102594X012
Y690VB Series
Specications
Body Sizes
NPS 3/4 or 1 (DN 20 or 25)
End Connection Styles
(1)
See Table 2
Maximum Allowable Inlet (Positive) Pressure
(2)
150 psig (10,3 bar)
Vacuum Control Pressure Ranges
(2)
See Table 1
Maximum Outlet (Casing) Pressure
(2)
Full Vacuum
Maximum Emergency Outlet Pressure to Avoid
Internal Parts Damage
(2)
150 psig (10,3 bar)
Spring Case Connection
1/4 NPT
Orice Size
Change in Vacuum Control Pressure
to Wide-Open
(2)
See Table 1
Pressure Registration
Type Y690VB: Internal
Type Y690VBM: External
Temperature Capabilities
Nitrile (NBR):
-20° to 180°F (-29° to 82°C)
Fluorocarbon (FKM):
40° to 300°F (4° to 149°C)
Ethylenepropylene (EPDM):
-20° to 275°F (-29° to 135°C)
Peruoroelastomer (FFKM):
-20° to 300°F (-29° to 149°C)
Approximate Weight
19 pounds (9 kg)
1/4 or 1/2-inch (6,4 or 13 mm)
1. End connections for other than U.S. standards can usually be provided; consult the local Sales Ofce.
2. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
(2)
B2672
VACUUM
PUMP
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
Figure 2. Type Y690VB Operational Schematic
VACUUM
BEing
LIMITED
POSITIVE PRESSURE OR ATMOSPHERE OR A
LESSER VACUUM THAN THE ONE BEING LIMITED
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Table 1. Vacuum Pressure Information
Y690VB Series
VACUUM CONTROL
PRESSURE RANGE
0 to 4-inches w.c. (0 to 10 mbar) 0.6-inches w.c. (1,5 mbar) 1.3-inches w.c. (3 mbar) 0N039427222 Unpainted 0.062-inches (1,6 mm)
0 to 1.0 psig (0 to 0,07 bar) 10-inches w.c. (25 mbar) 0.7 psig (0,05 bar) 0N086127022 Unpainted 0.125-inches (3,2 mm)
0 to 2.1 psig (0 to 0,14 bar) 1.2 psig (0,08 bar) 2.4 psig (0,17 bar) 0N004327022 Yellow 0.172-inches (4,4 mm)
0 to 5 psig (0 to 0,34 bar) 3.2 psig (0,22 bar) 6.3 psig (0,43 bar) 1D141827012 Dark blue 0.207-inches (5,3 mm)
1. Spring ranges based on atmospheric inlet pressure.
2. To convert to inches Hg, multiply psig value by 2.04.
(1)(2)
If this equipment is shipped mounted on
another unit, install that unit according
to the appropriate instruction manual.
1. Only personnel qualied through training and
experience should install, operate, and maintain
this equipment. For Y690VB Series equipment
CHANGE IN VACUUM TO WIDE-OPEN
1/4-inch (6,4 mm) Orice
Note
1/2-inch (13 mm)
Orice
downstream vacuum, to enter the system and restore
the controlled vacuum to its original pressure setting.
A Type Y690VB (Figure 3) direct-operated vacuum
breaker is self-contained and requires no control
line. A Type Y690VBM (Figure 4) vacuum breaker
requires a control line from the 1/2 NPT tapping in
the diaphragm case assembly to the point where the
vacuum needs to be controlled.
Spring
PART NUMBER
SPRING COLOR
Spring WirE
DIAMETER
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 ow through the body is in the
direction indicated by the arrow attached to the
body. If continuous operation is required during
inspection or maintenance, install a three-way
bypass valve around the equipment.
Startup and Adjustment
All Y690VB Series equipment can be placed in
operation by slowly introducing inlet vacuum or
pressure. This equipment takes control when vacuum
is established. This equipment is suitable for the
pressure range stamped on the nameplate (key 46),
and listed in Table 1. To adjust the pressure setting,
remove the closing cap (key 22) and turn the adjusting
Warning
!
This equipment may vent some gas
to the atmosphere. In hazardous or
ammable gas service, vented gas may
nut (key 20) clockwise to increase the pressure setting
or counterclockwise to decrease the setting. Replace
the cap after making this adjustment. If desired, the
closing cap may be wired to the hole provided in the
spring case (key 3) to discourage tampering.
accumulate and cause personal injury,
death, or property damage due to re or
explosion. Vent equipment in hazardous
gas service to a remote, safe location
away from air intakes or any hazardous
area. The vent line or stack opening
must be protected against condensation
or clogging.
Shutdown
First close the nearest upstream shutoff valve and then
close the nearest downstream shutoff valve to vent
the equipment properly. Next, open the vent valve
between the equipment and the downstream shutoff
valve nearest to it. All pressure between these shutoff
valves is released through the open vent valve.
Principle of Operation
The Y690VB Series vacuum breakers (Figure 2) are
used in applications where an increase in vacuum
must be limited. An increase in vacuum (decrease
in absolute pressure) is transmitted to the lower side
of the diaphragm, opening the disk assembly. This
permits positive pressure, atmosphere, or an upstream
vacuum that has higher absolute pressure than the
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.
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