Constant pressure systems are much like conventional systems in that they require a pump, a pressure tank and a pressure switch or sensor. The pressure sensor monitors the system pressure and sends a signal to the control panel for the pump. The controller then signals the pump to perform at a rate required to maintain the desired system pressure and volume. Depending on the specific system, the pressure setting may be adjustable at either the pressure sensor or the motor controller.
A pressure tank in a constant pressure system is usually much smaller than in a conventional system. In a constant pressure system, the tank stores very little water acting primarily as a buffer to prevent pressure fluctuations.
Pumps used in a constant pressure system are basically the same as those used in a conventional submersible system. Difference is that the motor attached to the pump runs at variable speeds depending on the volume of water being demanded. The motor speed is controlled by a variable frequency drive controller. Depending on the specific system, the motor could be a single or three phase unit.
Benefits of a Constant Pressure System
- The system maintains a steady pressure instead of cycling with a 20 pound differential.
- Ideal for multiple uses, including sprinkler and drip irrigation systems.
- Requires a much smaller pressure tank, saving precious space in what usually is a confined mechanical room, pump house or pit.
- Soft starts and stops equates to less wear on the pump and motor.
- On units operating with a three phase motor wire size can be smaller which means less cost in some applications especially when the pump depth is deep.