• Supply Pressure (Maximum): 250 psig, 1.7 bar, 1700 kPa
  • Ambient Temperature: -40°F to +200°F (-40°C to +93.3°C)
  • Port Size: 1/4" NPT, 3/8" NPT
  • Options:
    • Bias
    • Tamper Proof
    • BSPT (Tapered) Port Thread
  • Materials of Construction:
    • Body & Housing: Aluminum
    • Trim: Stainless Steel, Brass, Zinc Plated Steel
    • Diaphragm: Buna N & Dacron
    • Lever & Fulcrum: Hardened Steel
The above description encapsulates the entire product series. Specifications for individual configurations may vary depending on the selection chosen.
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Selected Configuration

Model #:

Model 21

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Configuration

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Flow Capacity

  • 40 SCFM (68 m³/Hour)

Supply Pressure - Maximum

  • bar: 17
  • kPa: 1,700
  • psig: 250

Supply Pressure Effect

  • psig: 0.1 (bar: 0.007, kPa: 0.7) for a psig: 100 (bar: 7, kPa: 700) change in supply pressure

Signal or Output Pressure - Maximum

  • bar: 10
  • kPa: 1,000
  • psig: 150

Ambient Temperature

  • -40° to 93° C (-40° to 200° F)

Sensitivity

  • 1/2" WC (1.27cm)

Exhaust Capacity - Relieving Units Only

  • 5.5 SCFM (9.4 m³/Hour)

Process Connection - Threaded

  • 1/4" NPT
  • 3/8" NPT
  • 1/4" BSPT
  • 3/8" BSPT

Actuator Type

  • Tamper-Proof

Enclosure/Body Material

  • Aluminum

Diaphragm Material

  • Buna-N
  • Dacron

Trim Material

  • Brass
  • Stainless Steel
  • Zinc-Plated Steel