Pneuline Pneumatic Relays
Low Pressure Selector
Low Pressure Selectors pass the lowest of two separate signals. A common use for these relays is to select the coldest of two zones to control a heating valve.
| ORDER # | Replaces |
|---|---|
| RPP500 | Honeywell #RP970A |
| Johnson #C-5226 | |
| L&G Powers #243-0200 | |
| Robertshaw #2372-351 | |
| Barber-Colman #AK-51642 |
Hi Pressure Selector
A High Pressure Selector will pass the highest of two different pressure signals. It is often used to select the hottest of two thermostat signals to control a cooling valve.
| ORDER # | Replaces |
|---|---|
| RPP400 | Honeywell #RP470A |
| Johnson #C-5226 | |
| L&G Powers #243-0020 | |
| Robertshaw #2372-351 | |
| Barber-Colman #AK-50301 |
Diverting Relay (Switching)
A Diverting Relay (or Switching Relay) acts similarly to an electric SPDT relay, but it is switched (energized) by a pneumatic signal. Adjustable set point 3-23#psi, 5psi differential
| ORDER # | Replaces |
|---|---|
| RPP100 | Honeywell #RP670A |
| Johnson #V-6133 | |
| L&G Powers #243-0001 | |
| Robertshaw #2353-503 | |
| Barber-Colman #AK-50301 |
Reversing Relay
A Reversing Relay reverses the action of the signal coming into the relay. For example, a direct acting signal is converted into a reverse acting signal. As the input signal increases in pressure, the output is lowered.
| ORDER # | Replaces |
|---|---|
| RPP300 | Honeywell #RP972A |
| Johnson #R-3030 | |
| Robertshaw #2360-501 | |
| Barber-Colman #AK-40613 |
Ratio Relay
A Ratio Relay is a relay that increases the output at a preset ratio to the change at the input. The adjustable ratio relay is used to slow down the rate of change. The other relay is used for speeding up the rate of pressure change at a fixed ratio.
| ORDER # | Replaces |
|---|---|
| RPP650 2:1 Ratio | Honeywell #RP971A |
| Johnson #C-202-1 | |
| Robertshaw #238-501 | |
| Barber-Colman #AK-50703 | |
| RPP630 | Adjustable Ratio 0.1 - 1.0: 1 Ratio |
Booster Relay or (Amplifying Relay)
Booster Relays (or Amplifying Relays) increase the volume or capacity of a pressure signal without increasing the pressure. They are used to refresh a low volume signal or a signal being sent over a long distance.
| ORDER # | Replaces |
|---|---|
| RPP700 | Honeywell #RP970A |
| Johnson #R-2080 | |
| Robertshaw #2372-501 | |
| Barber-Colman #AK-40603 |
