Emerson Fisher Y692VB Series, Fisher Y692VBM, Fisher Y692VB Instruction Manual
Instruction Manual
Form 5479
January 2010
Y692VB Series Vacuum Breakers
Introduction
Scope of the Manual
This manual provides instructions and a parts list
for Types Y692VB and Y692VBM vacuum breakers.
Instructions and parts lists for other equipment used
with these breakers are found in separate manuals.
Product Description
The Y692VB 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 1-1/2 and 2 (DN 40 and 50) body sizes and
have a 3/4 or 1-3/16-inch (19 or 30 mm) orice and
a 3/4-inch (19 mm) spring case vent connection with
optional umbrella vent assembly. The products are
described as follows:
W7429
Figure 1. Type Y692VB Vacuum Breaker
Y692VB Series
Type Y692VB—Type Y692VB has internal pressure
registration, so it does not require a control line.
Type Y692VBM—Type Y692VBM has a control line
connection and an O-ring stem seal to block the throat
for external pressure registration.
Specications
Some general ratings and specications for the
Y692VB Series vacuum breakers are given on page 2.
Individual vacuum 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 pressurecontaining parts may result if this
equipment is overpressured or is
installed where service conditions
could exceed the limits given in the
Specications, 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
D102661X012
Y692VB Series
Specications
Body Sizes
NPS 1-1/2 or 2 (DN 40 or 50)
End Connection Styles
(1)
See Table 1
Maximum Allowable Inlet (Positive) Pressure
(2)
and Orice Sizes
3/4-inch (19 mm) Orice: 30 psig (2,1 bar)
1-3/16-inch (30 mm) Orice: 13 psig (0,90 bar)
Vacuum Control Pressure Ranges
(2)
See Table 2
Maximum Casing Pressure
(2)
8 psig (0,55 bar) Vacuum
Change in Vacuum Control Pressure
to Reach Wide-Open
(2)
See Table 2
Pressure Registration
Type Y692VB: Internal
Type Y692VBM: External
1. End connections for other than U.S. standards can usually be provided; consult your local Sales Ofce.
2. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
Spring Case Connection
3/4 NPT
Type Y692VB Gauge Tap Connection
1/4 NPT
Type Y692VBM Control Line Connection
1/2 NPT
Temperature Capabilities
Nitrile (NBR): -40° to 180°F (-40° to 82°C)
Fluorocarbon (FKM):
40° to 300°F (4° to 149°C)
Ethylenepropylene (EPR):
-20° to 200°F (-29° to 93°C)
Peruoroelastomer (FFKM):
0° to 300°F (-18° to 149°C)
Silicone: -40° to 400°F (-40° to 204°C)
Approximate Weight
Cast Iron: 45 pounds (20 kg)
Steel, Stainless Steel, or Hastelloy® C:
57 pounds (26 kg)
(2)
Table 1. End Connection Styles
BODY SIZE,
NPS (DN)
1-1/2 (40) NPT
2 (50) NPT or CL125 FF
1. All anges are welded on to the body and have a face-to-face dimension of 14-inches (356 mm).
Cast Iron Steel or Stainless Steel Hastelloy® C
CONSTRUCTION MATERIAL AND END CONNECTION STYLE
NPT, SWE, CL150 RF,
CL300 RF, or PN 16/25/40
Table 2. Vacuum Pressure Information
VACUUM CONTROL
PRESSURE RANGE
1 to 3-inches w.c.
3 to 8-inches w.c.
8 to 16-inches w.c.
16 to 32-inches w.c.
0.25 to 3 psig
1. Pressure ranges are based on the spring case pointing up. Pointing the spring case down increases the pressure range 1.7-inches w.c. (4 mbar).
(Example: 1 to 3-inches w.c. (2 to 7 mbar) changes to 2.7 to 4.7-inches w.c. (7 to 12 mbar)).
2. Do not use uorocarbon (FKM) with these springs at diaphragm temperatures lower than 40°F (4°C).
(1)
(2 to 7 mbar)
(7 to 20 mbar)
(20 to 40 mbar)
(40 to 80 mbar)
(17 mbar to 0,21 bar)
(2)
(2)
Note
If this equipment is shipped mounted on
another unit, install that unit according
to the appropriate instruction manual.
CHANGE IN VACUUM
CONTROL PRESSURE TO
REACH WIDE-OPEN
1.2-inches w.c.
4.0-inches w.c.
5.0-inches w.c.
10.5-inches w.c.
2 psig
(3 mbar)
(10 mbar)
(13 mbar)
(26 mbar)
(0,14 bar)
SPRING PART
NUMBER
1D892527022
0B019727052
1B766627062
1B883327022
1A630627022
SPRING
COLOR
Brown
Purple
Gray
Unpainted
Black
this unit. Before installing the vacuum breaker,
make sure the unit was not damaged during
shipping and that it does not contain any foreign
material. Also ensure that all tubing and piping
have been blown free.
SPRING WIRE
DIAMETER,
INCHES (mm)
0.109
0.148
0.156
0.187
0.275
(1)
CL150 RF
(2,77)
(3,76)
(3,96)
(4,75)
(6,99)
SPRING FREE
LENGTH,
INCHES (mm)
6.12
(155)
6.00
(152)
6.62
(168)
6.62
(168)
5.25
(133)
1. Only personnel qualied through training and
experience should install, operate, and maintain
Hastelloy® C is a mark owned by Haynes International, Inc.
2
2. This unit may be installed in any position as long
as the ow through the body is in the direction
Type Y692VB
VACUUM
INLET PRESSURE
CONTROL PRESSURE (VACUUM)
ATMOSPHERIC PRESSURE
Type Y692VB
VACUUM
BEING LIMITED
VACUUM
PUMP
PUMP
TYPE Y692VB
VACUUM BREAKER
Y692VB Series
VACUUM
BEING LIMITED
UNION NUT
B2579
INLET PRESSURE
CONTROL PRESSURE (VACUUM)
ATMOSPHERIC PRESSURE
T PRESSURE
L PRESSURE (VACUUM)
C PRESSURE
POSITIVE PRESSURE, ATMOSPHERE,
OR A LESSER VACUUM THAN THE
Figure 2. Operational Schematic
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.
WARNING
!
This equipment may vent some gas
to the atmosphere. In hazardous or
ammable gas service, vented gas may
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.
Principle of Operation
An increase in vacuum (decrease in absolute
pressure) beyond the setpoint registers on the
diaphragm, opening the disk. This permits body
inlet pressure to enter the system and restore the
controlled vacuum to the setpoint. On Type Y692VB,
the pressure at the regulator body outlet registers
VACUUM BEING LIMITED
directly into the diaphragm casing. Type Y692VBM
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 (outlet body
pressure may or may not be the same as the pressure
in the diaphragm casing).
Startup and Adjustment
All Y692VB Series vacuum breakers can be placed
in operation by slowly introducing inlet pressure.
The unit takes control when vacuum is established.
This equipment is suitable for the vacuum control
pressure range stamped on the nameplate (key 50,
Figure 5). To adjust the pressure setting, remove
the closing cap (key 3) and turn the adjusting nut
(key 2) clockwise to increase the pressure setting or
counterclockwise to decrease the setting. Replace
the closing cap after adjustment. The closing cap
may be wired to the hole provided in the spring case
(key 23) to discourage tampering.
Shutdown
To shut down the unit, close the upstream shut-off
valve, and then close the downstream shut-off valve to
vent the equipment properly. Next, open the vent valve
3
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