Emerson Y690VB Data Sheet
Bulletin 71.3:Y690VB
Y690VB Series Vacuum Breakers
February 2010
W7292
Figure 1. Type Y690VB Vacuum Breaker
Features
• Common Spare Parts:
The Types Y690VB and Y690VBM have common
spare parts with the other Y690A Series products.
• Tamper–Resistant Adjustment:
Closing cap and spring case on many types allow
installation of sealing wire to discourage or detect
unauthorized adjustment of pressure setting.
• Easy Conversion:
The Type Y690VB converts easily to the
Type Y690VBM.
• Precision Control of Low-Pressure Settings:
Large diaphragm areas provide more accurate
control at low-pressure settings.
• Corrosion Resistance:
Constructions are available in a variety of materials
for compatibility with corrosive process gases.
Introduction
The Y690VB Series direct-operated vacuum breakers
are used for precise control of small capacity and
low-pressure service applications where an increase
in vacuum must be limited. The Type Y690VB has
internal pressure registration. The Type Y690VBM has
a control line connection and an O-ring stem seal for
external pressure registration.
www.sherregulators.com
D102593X012
Bulletin 71.3:Y690VB
Specications
Available Congurations
Type Y690VB: Direct-operated vacuum breaker
with internal registration.
Type Y690VBM: Direct-operated vacuum breaker
equipped with a blocked throat and control line
connection for external pressure registration.
Body Sizes
NPS 3/4 or 1 (DN 20 or DN 25)
End Connection Styles
See Table 1
Maximum Allowable Inlet Pressure
(1)
150 psig (10,3 bar)
Maximum Outlet (Casing) Pressure
(1)
Full Vacuum
Maximum Emergency Outlet Pressure to Avoid
Internal Parts Damage
(1)
150 psig (10,3 bar)
Vacuum Control Pressure Ranges
(1)
See Table 4
Construction Materials
See Table 3
Temperature Capabilities
(1)
Nitrile (NBR):
-20° to 180°F (-29° to 82°C)
Fluorocarbon (FKM):
40° to 300°F (4° to 149°C)
Ethylenepropylene (EPDM):
-20° to 300°F (-29° to 149°C)
Peruoroelastomer (FFKM):
-20° to 300°F (-29° to 149°C)
Pressure Registration
Type Y690VB: Internal
Type Y690VBM: External
Orice Size
1/4-inch (6,3 mm)
1/2-inch (13 mm)
Pressure Setting Adjustment
Adjusting Nut
Spring Case Connection
1/4 NPT
Flow Coefcients
See Table 2
Flow Capacities
See Table 6
1. The pressure/temperature limits in this Bulletin and any applicable standard or code limitation should not be exceeded.
Table 1. End Connection Styles
BODY SIZE,
NPS (DN)
3/4 (20)
1 (25)
1. All ange dimensions are 14-inches (356 mm) face-to-face.
END CONNECTION STYLE
Ductile Iron Stainless Steel
NPT
NPT, SWE, or ASME
(1)
CL150 RF
Diaphragm Case Connection
1/2 NPT
Approximate Weight
19 pounds (9 kg)
Table 2. Flow Coefcients
ORIFICE SIZE
INCHES (mm)
1/4 (6,3) 50 1.4 35
1/2 (13) 200 5.7 35
FLOW COEFFICIENT
C
g
C
v
C
1
2
VACUUM PUMP
Type Y692
July 2007
Type Y692
Bulletin 71.3:Y690VB
VACUUM BEING LIMITED
INLET PRESSURE
CONTROL PRESSURE (VACUUM)
INLET PRESSURE
CONTROL PRESSURE (OUTLET PRESSURE)
ATMOSPHERIC PRESSURE
ATMOSPHERIC PRESSURE
B2672
Figure 2. Y690VB Series Operational Schematic
POSITIVE PRESSURE OR ATMOSPHERE, OR A
LESSER VACUUM THAN THE ONE BEING LIMITED
3
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