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Fisher™ Y692VB Series Vacuum Breaker
Y692VB Series vacuum breakers are used in applications where an increase in vacuum must be limited.
An increase in vacuum beyond a registered value on the diaphragm of the Y692VB Series will open the regulator to allow atmosphere or a positive pressure to enter the system and restore the controlled vacuum to its original pressure setting.

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Fisher™ Y692VB Series Vacuum Breaker


Body Sizes and End Connection Styles
Cast Iron:
  NPS 1-1/2, NPT
  NPS 2 / DN 50, NPT or CL125 FF
Steel or SST:
  NPS 1-1/2 or 2 / DN 40 or 50, NPT, SWE, CL150 RF, CL300 RF, or PN 16/25/40
Hastelloy C:
  NPS 1-1/2 or 2 / DN 40 or 50, CL150 RF
Pressure Registration
Type Y692VB: Internal
Type Y692VBM: External
Maximum Allowable Inlet Pressure
1-3/16-inch / 30 mm Orifice: 13 psig / 0.9 bar
3/4-inch / 19 mm Orifice: 30 psig / 2.1 bar
Maximum Outlet (Casing) Pressure
8 psig / 0,55 bar vacuum
Vacuum Control Pressure Ranges
1-inch w.c. to 3 psig / 2 to 207 mbar in six ranges
Temperature Capabilities
NBR: -40° to 180°F / -40° to 82°C
FKM: 40° to 300°F / 4° to 149°C
FFKM: 0° to 300°F / -18° to 149°C
EPDM: -20° to 275°F / -29° to 135°C
VMQ: -40° to 400°F / -40° to 204°C
Additional Technical Data
For additional technical information, contact your local Sales Office or refer to technical documentation.


  • Precision Control of Low-Pressure Settings
  • Corrosion Resistance
  • Tamper-Resistant Adjustment
  • Wide Material Selection