Model 18 Vacuum Relief Regulator

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Model 18 Vacuum Relief Regulator

Model 18 Vacuum Relief Regulator

The Fairchild Model 18 Vacuum Relief Regulator is designed for systems that require system vacuum control up to full vacuum. The Model 18 Vacuum Relief Valve uses a force balance principle to open the relief valve and allow atmospheric air to lower vacuum levels when the set point is exceeded. 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. The Model 18 pneumatic vacuum relief regulator features control sensitivity of less than 1/8" water column and a balanced supply valve to deliver consistent and reliable accuracy. 
The Fairchild Model 18 will handle a 30 in Hg, 762 Torr, 102 kPa maximum supply vacuum and offers three (3) relief vacuum ranges from 4 in Hg, 140 mbar, 14 kPa, up to 30 in Hg, 1,000 mbar, 100 kPa. The Fairchild Model 18 pneumatic vacuum relief regulator offers up to 8 SCFM, 68 m3/hr flow capacity.
Features
  • Full vacuum capability
  • Control sensitivity of less than 1/8" water column
  • Aspirator Tube
  • Separate Control Chamber
  • Unit construction
The above description encapsulates the entire product series. Specifications for individual configurations may vary depending on the selection chosen.
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The Fairchild Model 18 Vacuum Relief Regulator is designed for systems that require system vacuum control up to full vacuum. The Model 18 Vacuum Relief Valve uses a force balance principle to open the relief valve and allow atmospheric air to lower vacuum levels when the set point is exceeded. 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. The Model 18 pneumatic vacuum relief regulator features control sensitivity of less than 1/8" water column and a balanced supply valve to deliver consistent and reliable accuracy. 
The Fairchild Model 18 will handle a 30 in Hg, 762 Torr, 102 kPa maximum supply vacuum and offers three (3) relief vacuum ranges from 4 in Hg, 140 mbar, 14 kPa, up to 30 in Hg, 1,000 mbar, 100 kPa. The Fairchild Model 18 pneumatic vacuum relief regulator offers up to 8 SCFM, 68 m3/hr flow capacity.
Features
  • Full vacuum capability
  • Control sensitivity of less than 1/8" water column
  • Aspirator Tube
  • Separate Control Chamber
  • Unit construction
The above description encapsulates the entire product series. Specifications for individual configurations may vary depending on the selection chosen.
Part Number / SKU

Model 18

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Selected Configuration

    Model 18

      Specifications

      Agency Approvals

      • CRN

      Pressure Range

      • bar: 0.14 to 1
      • Inches Hg: 4 to 30
      • kPa: 14 to 100
      • psi: 2 to 14.5

      Supply Pressure - Maximum

      • 3" Hg (762 Torr)

      Ambient Temperature

      • -40° to 93° C (-40° to 200° F)

      Accuracy

      • <1/8" WC

      Sensitivity

      • <1/8" WC (0.32 cm)

      NPT Connection

      • 1/4" Female NPT
      • 3/8" Female NPT
      • 1/2" Female NPT

      BSP Connection

      • 1/4" Female BSPP
      • 1/4" Female BSPT
      • 3/8" Female BSPP
      • 3/8" Female BSPT
      • 1/2" Female BSPP
      • 1/2" Female BSPT

      Actuator Type

      • Knob Assembly
      • Tamper-Proof

      Flow Capacity

      • 8 SCFM (68 m³/hr) at 29" Hg Vac

      Mounting

      • Bracket Kit

      Enclosure/Body Material

      • Aluminum Housing

      Diaphragm Material

      • Nitrile on Dacron

      Trim Material

      • Brass
      • Zinc-Plated Steel

      Elastomers

      • FluoroCarbon
      • Nitrile
      • Silicone