66 Series direct-operated pressure-reducing regulators are widely used in burner control, tank blanketing systems, and other applications where precise control of low-pressure industrial gases is needed, while 66 Series direct-operated vacuum service equipment comes in both vacuum regulator and vacuum breaker constructions.
Specifications
Body Sizes and End Connection Styles
NPS 2, 3 or 4 / DN 50, 80 or 100
Cast Iron Body: NPT or CL125 FF
Steel Body: NPT, CL150 RF, CL150 FF, CL300 RF
Emergency Inlet Pressure
Type 66, 66Z, 66ZZ or 66 Series Vacuum Breakers: 25 psig / 1,7 bar positive pressure
66 Series Vacuum Regulators: 8 psig or 16.3-inches of mercury / 0,55 bar differential vacuum
Maximum Inlet Pressure to Avoid Internal Parts Damage
Type 66: 10 psig / 0,69 bar
Type 66Z: 5 psig / 0,34 bar
Type 66ZZ: 2 psig / 0,14 bar
Recommended Inlet Pressure
Type 66, 66Z or 66 Series Vacuum Breakers: 5 psig / 0.34 bar positive pressure
Type 66Z: 2 psig / 0,14 bar
66 Series Vacuum Regulator: 6-in w.c. or 0.4-in of mercury / 15 mbar differential vacuum
Emergency Outlet (Casing) Pressure
Type 66, 66Z or 66ZZ: 8 psig / 0,55 bar positive pressure
66 Series VR: 14.7 psi or 29.9-in of mercury / 1.01 bar differential vac
66 Series VB: 8 psi or 16.3-in of mercury / 0.55 bar differential vac
Maximum Safe Pressure to Avoid Internal Parts Damage
Type 66, 66Z or 66ZZ: 1 psig / 0,07 bar differential above outlet pressure setting
66 Series Vacuum Regulator: No more than 1 psig / 0,07 bar differential change from spring setting
Pressure Registration
Type 66, 66Z or 66ZZ
Cast Iron Body: Internal (standard) or External
Steel Body: External (standard) or Internal
66 Series Vacuum Regulators or Breakers: External
Temperature Capabilities
NBR: -40° to 180°F / -40° to 82°C
FKM: 0° to 350°F / -18° to 177°C
EPDM: -40° to 275°F / -40° to 135°C
Features
Sensitive Response to Pressure Changes
Seat Protection without Sacrifice in Shutoff Capability
Tank Blanketing Capability
Accuracy
Application Flexibility
