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Pneumatic Four Port Ratio Relay


Wall, In-Line or panel mounted Pneumatic Four Port Ratio Relay

  • Product Info
  • Literature


Pneumatic relay produces a modulating pressure output, and controls pneumatic valve or damper actuators in sequence from a single thermostat. Replacements are available for Johnson, Powers, Robertshaw, Barber-Colman, and older Honeywell devices.


  • Adjustable pilot start point pressures.
  • Two pilot pressure spans available.
  • Four sharp-barb air connections.
  • Molded plastic construction with neoprene.
  • Mounting clip provided.

Product Specifications

Pneumatic, Four Port Ratio Relay
Airflow Usage
0.002 scfm (1.0 mL/s) maximum
Dimensions (in.)
2 in. diameter x 2 5/8 in. deep
Dimensions (mm)
52 mm dia. x 67 mm deep
Maximum Safe Operating Pressure (psi)
30 psi, maximum
Maximum Safe Operating Pressure (kPa)
205 kPa, maximum
Temperature Range (F)
0 F to 140 F
Temperature Range (C)
-18 C to +60 C
14003030-002 Mounting Clip and scaleplate with kPa markings
Wall or In-line or panel
Operating Humidity Range (% RH)
5 to 95% RH
Pressure Range (psi)
Output Span--3 to 13 psi
Pressure Range (kPa)
Output Span--21 to 90 kPa
Direct Acting
Air connections
Barb fittings, Port 1: 1/4 in. (6 mm) O.D. plastic tubing; Other Ports: 5/32 in. (4 mm) O.D. plastic tubing
0.039 scfm at 1 psi differential (18 mL/s at 5 kPa differential)
Produces modulating pressure output proportional to pilot pressure input changes
Pilot Start Pressure (psi)
Adjustable 0 to 10 psi
Pilot Start Pressure (kPa)
Adjustable 0 to 69 kPa