The Pneumatic Relay is a pilot operated valve designed to provide the higher air or gas flow rates necessary for pneumatic drive cylinders greater than 3 inches. The pneumatic relay is actuated by the pulses produced by the Oscillamatic Controller. A dual acting relay is used with pumps that do not have a piston return spring.

Features:

• Air/gas pressure from a controller forces a piston and one or more attached poppet valves to move.
• Then, when the controller removes the pressure, a spring forces both the piston and poppet valve(s) in the reverse direction.
• The PO4-6S relay, used on pumps that do not have a motor return spring, drives the air piston both up and down with the air/gas pressure.
• This relay has two poppet valves.
• The upper valve operates in the same way as the PO3-6S relay valve, while the lower valve operates in the opposite order.
• That is, when the upper valve applies air/gas pressure to the pump, the lower valve exhausts it, and when the upper valve exhausts the air/gas, the lower valve applies pressure to the opposite side of the piston.