3 Product Description
3.1 System description
System layout
The images show a typical single-pump and multi-pump system using the unit.
When the system is connected directly to the water supply use a low-pressure switch on
the suction side.
Figure 1: Single-pump system
Figure 2: Multi-pump system
1. Pump with HYDROVAR
2. Diaphragm pressure tank
3. Distribution panel
4. Gate valve
5. Non-return valve
6. Low water control
7. Pressure gauge
8. Pressure sensor
9. Drain tap
Pressure tank
A diaphragm pressure tank is used on the discharge side of the pump to maintain
pressure in the pipes when there is no water demand. The unit stops the pump from
continuing to run at zero demand and reduce the size of the tank that is required for
supply purposes.
The tank must be permitted and suitable for systems pressure.
The capacity of the tank must be 10% of the maximum system flow rate of the pump or
pumps (0.1 times the flow rate in l/min or gal/min). Turn off the unit to reduce the water
pressure to check and set the correct pre-charged pressure.
The pre-charge pressure of the tank can be determined by using the following table:
Required pressure or Start Value when active [bar]
Pre-charge pressure [bar]
3 Product Description
12 HVL 2.015-4.220 Installation, Operation, and Maintenance Manual
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