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RP972 is a modulating relay suitable for all types of heating and air conditioning control systems, to reverse and increase the capacity of branchline pressure to an element. The output varies inversely with the input with an adjustable offset.


  • Reverse acting.
  • In-line mounting or can be wall or panel mounted with mounting clip provided.
  • Molded plastic construction with neoprene diaphragms.

Product Specifications

Pneumatic Reversing Relay
Airflow Usage
0.002 scfm (1.0 mL/s) maximum
Dimensions (in.)
1 1/2 in. diameter x 2 1/4 in. deep
Dimensions (mm)
38 mm diameter x 57 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
14003030-001, 1 1/2 in. Mounting Clip for Mounting relay to wall or panel
Wall or In-line or panel
Operating Humidity Range (% RH)
5 to 95% RH
Reverse Acting
Air connections
Barb fittings for three 5/32 in. (4 mm) and one 1/4 in. (6 mm) O.D. plastic tubing
0.039 scfm at 1 psi differential (18 mL/s at 5 kPa differential)
Output varies inversely with input with an adjustable offset
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