With this valve, a defined flow rate can be limited purely hydraulically - irrespective of any changes in operating pressure. With the control valve, the flow rate can be adjusted progressively +/- 15%.
Application: In front of a filter, to secure the extinguishing water reserve in the primary network and to limit the inflow into a lower pressure zone
Variants: Electrically controlled, with pressure reduction control and combinations thereof
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.
To use in drinking water systems (other media after consultation)
Limitation of the inflow from a pressure zone into a lower pressure zone
Constantly maintaining a filter flow
The supply to a secondary network necessitates a limitation of the flow, so as to not endanger, for example, the extinguishing reservoir of the primary network (in combination with a reduction in pressure).
Mode of operation
The flow–control valve completely hydraulically ensures a pre–determined maximum flow, irrespective of any changes in the operating pressure. The nominal flow rate can be progressively varied up to ±15% via the control valve.
To calculate the dimensions of the valve please refer to the following information:
Maximum and minimum inlet pressure (static and dynamic pressure ratios)
Required flow rate
Permissible loss of pressure incl. measuring orifice (usually 0.5 bar over the valve and orifice plate)
Available line diameters and lengths
Construction of the valve (straight or angle design)
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 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
- Basic valve EN-GJS-400
- Epoxy coating (min. 250 µm) acc. to GSK, RAL 5012
- Spindle unit INOX, EN-GJS-250
- Control line, fittings and control filter stainless steel
- Control valve INOX
Installation and assembly
Shut–off valves should be fitted on both sides of the valve and a dirt trap should be installed on the inlet side of the valve. Depending on the installation situation, a mounting/dismounting adapter should be provided.
The orifice plate must be installed after the valve. It is recommended that the following measurements are taken into consideration:
X = 5 x DN, distance between the valve and the orifice plate in a straight line
Y = 3 x DN, distance after the orifice plate and the shut–off component, in a straight line
Maintenance-free, non-rusting valve seat
EWS-coating according to RAL GSK