Pneumatic Direct/Reverse Acting Multi-Purpose Relay

The Powers RL 243 MP Multi-Purpose Relay is a pneumatic auxiliary device designed to provide a variety of pneumatic control functions for the typical control system. Applications include direct and reverse acting amplifying, signal advancing, minimum pressure relay, and lower pressure transfer.

The relay operates on a force balance principal and is provided with a Powers two-valve design to assure stability and prevent unnecessary air consumption. Internal relief assembly prevents signal lock-up and assures fail-safe operation. The relay housing is provided with integral brackets to facilitate installation without a separate bracket.

A single spring adjustment is provided to allow setting the relay for desired operation. The relay is adaptable for flush panel mounting to facilitate manual readjustment if desired.

Application:

The multi-purpose relay is factory calibrated with a 15 psi spring adjustment for reverse acting service. However, the multi-purpose relay provides a number of specific control actions which are frequently utilized in control systems. Some of the typical applications where this relay can be applied are as follows. Additional applications can be obtained depending upon how it is piped and applied with other devices in a single system.

• Direct acting amplifying
• Reverse acting amplifying
• Lower pressure transfer relay
• Signal advancing relay
• Minimum pressure relay
• DA or RA limit control
• Signal inverting relay
• Characterized minimum pressure relay