AquaMatic Stager Series Valves are a motor-driven rotary multiport pilot valves, which are used to control a set of individual diaphragm valves in a predefined sequence. Stagers are constructed of durable, noncorroding, self-lubricating material for long and trouble-free operation. Stagers are driven by an electric motor and are controlled by AquaMatic Programmable Controllers or Adjustable Timers. In the event of a power failure, AquaMatic Stager Series Valves can be manually advanced through all positions. The stager functions by pressurizing and venting the control ports, allowing valves to open and close in a predefined sequence. The control pressure to the stager, either hydraulic or pneumatic, must be constant and equal to or greater than the line pressure in the system.