The main valve is a hydraulically operating diaphragm valve. The work energy is the inherent medium.
Most valve types operate purely hydraulically without any foreign energy.
Application
To use in drinking water systems (other media after consultation)
Actuation of the valve with the pump control system
Protection of the pump against overloading caused by a no–load operation
Mode of operation
The pump protection valve opens with a time delay after the pump is started up. Consequently the network pressure increases to the full pump pressure before the valve opens. With a controlled stopping of the pump, the valve closes before the pump stops. The opening and closing speeds can be set on the throttle non–return valve. In the event of a power failure, the installed hydraulic return–flow function prevents a backflow to the pump (the valve closes).
Product information
To calculate the dimensions of the valve please refer to the following information:
Maximum and minimum inlet pressure (static and dynamic pressure ratios)
Existing counterpressure
Required flow rate, pump capacity
Maximum permissible loss of pressure
Voltage information for the solenoid valve
Available line diameters and lengths
Construction of the valve (straight or angle design)
The controller is to be provided by the customer.
For the calculation basis, information on the loss of pressure and the characteristic values of the valve, please refer to the end of Chapter E.
Design
Design according to DIN EN 1074
Construction length acc. to DIN EN 558
Flange mass according to DIN 1092-2, to PN 25 DN 300
Pressure levels: PN 10 or PN 16 to DN 300, PN 25 to DN 200, higher pressures on request.
Nominal widths DN 50, DN 80, DN 100 and DN 150 available in angular design
Nominal widths 1 ½" and 2" with threaded connection (female thread)
Medium temperature up to 40°C
Installation and assembly
The pump protection valve is installed in the feed pipe of the pipe. A shut–off valve is to be installed on the outlet side.