Model 18 Vacuum Relief Regulator

Brand: Fairchild Industrial Products
The Rotork 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
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Images are representations only.
The Rotork 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

Model 18

Pressure Range

Fitting and Filters

Port Thread

Elastomers

Adjustment Type

Specifications

Actuator Type

  • Knob Assembly
  • Tamper-Proof

Ambient Temperature Range

  • -40° to 93° C (-40° to 200° F)

Approvals & Certifications

  • CRN

BSP Connection

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

Diaphragm Material

  • Nitrile on Dacron

Elastomers

  • FluoroCarbon
  • Nitrile
  • Silicone

Enclosure, Body Material

  • Aluminum Housing

Flow Capacity

  • 8 scfm (68 m³/hour) at 29" Hg Vac

Mounting

  • Bracket Kit

NPT Connection

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

Pressure Range

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

Sensitivity

  • < 1/8" WC (0.32 cm)

Trim Material

  • Brass
  • Zinc-Plated Steel

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