8
2 OVERVIEW
2.1 INTRODUCTION
Pegasus2 is a system that is used to control the outlet pressure of a pressure reducing
valve (PRV) within a clean-water supply pipe network. The Pegasus2 includes built-in
data logger functionality. This section gives an overview of Pegasus2, the equipment
that is required to use it, and other (optional) system elements.
The system is designed to control pressure reducing valves that are designed and
manufactured by 3
rd
party suppliers. Therefore, only general details of PRV valve
construction are included in this manual.
Pressure control can be either:
• Continuous control:
i.e. Incremental adjustment of pressure, between a maximum and minimum;
The Pegasus2 product is ideal for this situation.
or
• 2-point control:
i.e. Automatic switching between two pre-set pressure levels.
The Sentinel 2 product is ideal for this situation.
… It is a simplified product, based on the Pegasus2.
It does not use the Solenoid Box; a Hydroswitch unit is used.
(Refer to the Sentinel 2 manual for further details).
Pegasus2 allows incremental adjustment of the PRV output pressure to closely follow a
pre-determined pressure profile.
The pressure profile can be based on:
• The time of day, or
• The flow rate (demand) of water, or
• Both of the above.
The pressure profiles are defined by a set of tables within the unit. The tables can be
entered manually during installation. Pegasus2 can also communicate with a central
server that is used to store its measurement data. The server can be configured to
analyse the effectiveness of the Pegasus2 pressure control and (if required) remotely
update the unit’s pressure profiles. (This is achieved via PressView web software).
The system also offers a fail-safe mode, where it can operate the PRV at a fixed outlet
pressure when certain fault conditions occur (e.g., detection of a sensor failure).
The Pegasus2 system typically consists of the following parts:
• A Control Box unit.
• A Solenoid Box unit.
• A cable linking the Control Box to the Solenoid Box.
• A HWM mechanical actuator.
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