Model 16 Vacuum Regulator from Rotork Fairchild

Model 16 Vacuum Regulator from Rotork FairchildRotork Fairchild Model 16 Vacuum Regulator is designed for systems that require system pressure control above and below atmospheric pressure. Stability of regulated vacuum or pressure is maintained under varying flow conditions through the use of an aspirator tube which adjusts the inner valve in accordance with the flow velocity.

Operating Principles
When you adjust the Range Screw to a specific setpoint, the Range Spring exerts a downward force on the top of the Signal Diaphragm. The Negative Bias Spring creates an upward force on the bottom of the Signal 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. For more information, see cross sectional diagram. 

Outlet pressure is maintained as a result of balance between forces acting on the top and bottom of the Diaphragm Assembly.

Features

Model 16 Vacuum Regulator Features

  • The Model 16 Vacuum Regulator is designed for systems that require system pressure control above and below atmospheric pressure.
  • Control sensitivity of 1/2" water column allows use in precision applications.
  • A balanced Supply Valve minimizes the effects of supply pressure variation.
  • An Aspirator Tube compensates downstream pressure 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 Model 16 without removing it from the line.
  • Mounting Bracket is available.
  • Canadian Registration Number (CRN) Certification for all territories and provinces

Specifications

Model 16 Vacuum Regulator Specifications

SpecificationValue
Supply Pressure250 psig [17.0 BAR] (1700 kPa) Maximum
Positive Flow Capacity (SCFM)40 (65.2 m3/hr) @ 100 psig [7.0 BAR] (700 kPa) supply & 20 psig [1.5 BAR] (150 kPa) setpoint
Vacuum Flow Capacity (SCFM)2.5 (4 m3/hr) @ 29” Hg VAC with pump connected to exhaust port40 (65.2 m3/hr) @ 100 psig supply connected to inlet port
Supply Pressure EffectLess than 0.1 psig [.007 BAR] (0.7 kPa) for 100 psig [7.0 BAR] (700 kPa) change in supply pressure
Sensitivity1/2” (1.27 cm) Water Column
Ambient Temperature Range-40°F to +200°F (-40°C to +93.3°C)
Materials of Construction
  • Body & Housing: Aluminum
  • Trim: Stainless Steel, Brass, Zinc-Plated Steel
  • Diaphragms: Nitrile on Dacron
Hazardous Locations RatingAcceptable for use in Zones 1 & 2 (gas atmosphere, Groups IIA & IIB) and Zones 21 & 22 (dust atmospheres)

Q & A

Q&A Section with Expand/Collapse Icons

Model 16 Vacuum Regulator Q & A:

+ What pressure ranges can the Model 16 handle?
The Model 16 is designed for both vacuum and positive pressure control. It supports supply pressures up to 250 psig (≈17 BAR). Output (regulated) ranges include vacuum to 2 psi (≈0.15 BAR /15 kPa) up to vacuum to 150 psi (≈10 BAR /1,000 kPa).
+ What is the flow capacity of the Model 16?
The unit offers a positive flow capacity of up to 40 SCFM (≈65 m3/hr) under a 100 psig supply condition.
+ How sensitive is the device?
The regulator features a sensitivity of ?″ water column (≈1.27 cm) which enables precise control even at low differential pressures.
+ Does the supply pressure variation affect the regulated output?
Yes—but minimally. The Model 16 uses a balanced supply valve and aspirator tube to compensate for supply pressure changes and downstream flow variations, helping maintain stability.
+ What are some of the construction and design features?
Key features include: a separate control chamber isolating the diaphragm from main flow to avoid “hunting”/“buzzing” issues; aspirator tube to compensate for downstream droop under flow; and the unit can be serviced in-line (without removal).

 

Downloads

Download Rotork Fairchild Model 16 Vacuum Regulator Datasheet

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