Control systems

Details of VAG technology

There are four different control systems available for operating the VAG pressure management system.

Constant control of VAG technology

Constant control

In the constant control system, a constant follow-up pressure is set behind the control valve. This efficient, cost-effective method of control is particularly suitable for realising initial savings at an early stage. Besides, hydraulic data on the network and its reactions to a drop in pressure can be gathered.
The modular structure of the system enables it to be specifically extended and converted to the most suitable control system on the basis of findings gained from this data.

 

Time-based control of VAG technology

Time-based control

In the time-based control system, several values for follow-up pressure behind the control valve are stored. These values are used for different time frames – at least two – at different time throughout the day in order to appropriately counter fluctuating consumption cycles. In the simplest case the focus is only on pressure reduction that occurs at night in order to eliminate extreme pressure peaks. Additional potential for savings is realised by means of multi-staged application.
 
This simple control method enables a response to dynamic consumption behaviour and an effective reduction of pressure. Collecting more operating data enables an application-specific upgrading of the system in order to achieve the maximum potential for savings.

 

Flow-based control of VAG technology

Flow-based control

In the flow-based control system, the follow-up pressure directly behind the control valve is regulated according to the current water consumption in the supply area. This system exploits the hydraulic regularity between differential pressure and flow in order to achieve consistent, consumption-driven regulation, thus being able to flexibly respond to crucial drops in pressure as a result of consumption. The control system can of course also be subsequently optimised in this case too, in order to achieve the best-possible potential for saving.

 

Critical-point control of VAG technology

Critical-point control

The critical-point control system is the best-possible method for regulating feed pressure. The critical point is the place in the network in which typically the lowest pressure values occur during the course of the day. Permanently monitoring this pressure value and transmitting it to the control unit enables the feed pressure to be reduced to the lowest realisable value without falling short of the required minimum pressure level. This enables maximum savings potential to be realised while at the same time guaranteeing a reliable supply.
 
The pressure value is permanently monitored and transmitted to the controls, so that the feed pressure can be reduced to the lowest realisable level without the risk of falling short of the minimum required pressure level. Maximum potentials for savings can thus be realised at the same time as a maximum guarantee of supply.