Pressure Reducing & Sustaining Valve

Pressure Reducing & Sustaining Valve

domain of usage:

Regulating, reducing and keeping constant the output pressure of the valve in the transmission, network and distribution lines of drinking and raw water.

2. Keeping the inlet pressure constant

In some branches of transmission lines, networks or distribution of water in places and intersections of pipelines, there may be routes where water consumption and exploitation is more than other branches of that network at some times, so in such In order to adjust the distribution of water in the network, this valve will be used as an inhibiting factor in the transfer of water to the branch where its consumption exceeds the permitted and predefined limit. It will be adjustable, and in other words, if the upstream pressure drops below a certain minimum, the valve will be closed and will not allow the water to exit until its inlet pressure reaches the pre-set minimum.

Application temperature range: up to 70 degrees Celsius

Production range: DN50…DN800, PN10…PN40

Reference standards in design and construction

Face to face dimensions of two valve flanges according to the standards: DIN-EN558-1 Series, DIN3202-1 SeriesF1

Dimensions and drilling of flanges according to standards: DIN-EN 1092/1-2, DIN 2501, ISO7005/1-2

Hydrostatic tests (sealing, pressure resistance and functional): ISO 5208

Type of cast iron: gray cast iron: DIN-EN 1561 GJL 250 DIN1691 GG-25

Ductile iron: DIN-EN 1563 GJS 400-15 DIN 1693 GGG-40

Inner and outer coating: epoxy electrostatic powder paint/epoxy liquid paint.

Important note:

1. The ratio of the adjusted output pressure of the valve to the input pressure should be such that the valve operates within the allowed range (outside the cavitation range), otherwise, due to the destructive phenomenon of cavitation, the internal parts will suffer wear and therefore the useful life of the valve will decrease

2. For installation and operation, please pay attention to the instructions for automatic mechanical pressure relief valve of Navid Kariz friends.

Mechanism and mode of operation: The automatic inlet pressure relief valves of Navid Kariz Dostan company are designed in such a way that by setting two distinct pilots in the control circuit outside the valve, it has the following performance:

1. Adjusting, reducing and keeping the outlet pressure constant

2. Keeping the output pressure and the top of the valve constant.


Body and cap material:

Gray cast iron PN10 Ductile cast iron for PN25, PN16 Steel A216 for PN40

Description: DN500 to DN800 valves are made of steel (fabricated).

Ductile iron will be produced and provided for PN10 valves with the previous order of buyers.