The Fairchild 17 Vacuum Regulator is designed for systems that require system vacuum control up to full vacuum.
When you adjust the Range Screw to a specific setpoint, the Range Springs exerts a downward force on the top of the Control Diaphragm. The Negative Bias Spring creates an upware force on the bottom of the Diaphragm. The upward net force opens the Relief Valve (vacuum supply) to let Vacuum flow from the Outlet Port to the Exhaust Port. As the setpoint is reached, the decrease in pressure lets the Diaphragm Assembly move downward to close the Relief Valve (vacuum supply).
When the Vacuum increases above the setpoint, the Diaphragm Assembly moves downward to open the Supply Valve that adds positive pressure to the system to maintain Output pressure.
Outlet pressure is maintained as a result of balance between forces acting on the top and bottom of the Diaphragm Assembly.
Max Vacuum Capacity
30 in Hg (762 Torr) (102 kPa), up to "Full" Vacuum
12 SCFM (20.4 m³/hr)
2.0 SCFM (3.4 m³/hr)
Vacuum Supply Effect
Less than 0.1% of change in supply vacuum
-40°F to +200°F, (-40°C to 93.3°C)
Acceptable for use in Zones 1 and 2 for ga atmosphere; Groups IIA and IIB and Zones 21 and 22 for dust atmostpheres.
Materials of Construction
Body and Housing: Aluminum
Diaphragms: Buna N on Dacron (Std. unit only)
Trim: Stainless, Zinc Plated Steel