Rotork Fairchild Model 17 Vacuum Regulator is designed for systems that require system vacuum control up to full vacuum. The Model 17 control diaphragm is balanced by a set of three range springs to provide the most stable, responsive and reliable operation.
Operating Principles
The model 17 is a true vacuum regulator in that a vacuum supply is provided at one port and controlled vacuum is made available
at the other. The model 17 uses force balance principals to control the movement of the main valve. Since the vacuum regulator operates below atmospheric pressure, atmospheric pressure is employed to provide the motive force to operate the vacuum regulator.
Referencing the diagram above, turning the control knob clockwise draws the lower spring seat upward compressing the range springs. The upper spring seat, connected to the diaphragm assembly, is spring biased in an upward direction as a result. The upward bias of the diaphragm assembly opens the supply valve and ports the vacuum supply to the outlet. As the vacuum level increases, the diaphragm assemble is drawn downward and closes the supply valve as the setpoint is reached. If the vacuum setpoint is exceeded, the diaphragm assembly continues in a downward direction and unseats the relief valve allowing atmospheric pressure to enter the system and reduces the vacuum level to the setpoint.
Features
Model 17 Vacuum Regulator Features
- The Model 17 Vacuum Regulator is designed for systems that require system vacuum control up to full vacuum.
- Control sensitivity of 1/2" water column allows use in precision applications.
- High flow capacity
- A balanced vacuum Valve minimizes the effects of vacuum variation.
- An Aspirator Tube compensates downstream vacuum droop under flow conditions.
- A separate Control Chamber isolates the diaphragm from the main flow to eliminate hunting and buzzing.
- Unit construction lets you service the Model17 without removing it from the line.
- Mounting Bracket is available.
- Canadian Registration Number (CRN) certification for all territories and provinces.
Specifications
Model 17 Vacuum Regulator Specifications
| Specification | Description |
|---|---|
| Vacuum Range | 30 in Hg (762 Torr) (102 kPa), up to “Full” Vacuum |
| Flow Capacity | 12 SCFM (20.4 m3/hr) |
| Relief Capacity | 2.0 SCFM (3.4 m3/hr) |
| Vacuum Supply Effect | Less than 0.1 % change in supply vacuum |
| Ambient Temperature Range | -40 °F to +200 °F (-40 °C to 93.3 °C) |
| Hazardous Location Rating | Acceptable for use in Zones 1 and 2 for gas atmospheres (Groups IIA and IIB) and Zones 21 and 22 for dust atmospheres |
| Materials of Construction |
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Q & A
Model 17 Vacuum Regulator Q & A:
Downloads
Download Rotork Fairchild Model 17 Vacuum Regulator Datasheet
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