The Fisher™ Y692VB Series are direct-operated vacuum breakers engineered for precise control in low-pressure, small-capacity applications where vacuum buildup must be carefully limited. The Type Y692VB features internal pressure registration, while the Type Y692VBM includes an external control line connection and an O-ring stem seal to isolate the throat, allowing for external pressure registration.
Features
• Precision Control of Low-Pressure Settings
• Corrosion Resistance
• Tamper-Resistant Adjustment
• Wide Material Selection
Specifications
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.
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