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      DRVD

      drvd
      • DN 50 - 200
      • PN 16 - 25 - 40
      • 3 regulation fields (bar): 1, 5-6/ 2-8/ 4-12

       

      The spring pressure reducer (DRVD) is a valve capable of automatically reducing and stabilizing the pressure of the fluid downstream to a constant predetermined value, regardless of the variations in the upstream conditions, both in terms of pressure and flow. It is therefore used at the entrance to the supply pipeline of the systems both for safety requirements (always have the pressure of the downstream network below the maximum admissible value), and for functionality needs (to make the downstream network work at a pressure constant).

      • Spheroidal cast iron GJL-400-15 ADWEA – Abu Dhabi Version
      • Downstream pressure adjustable from 1,5 to 6 bar, 
      • Downstream pressure adjustable from 2 to 8 bar, 
      • Downstream pressure adjustable from 4 to 12 bar

      Version with fittings for gauge upon request.

      Applications: Water Irrigation Industry

      Materials

      • Body and cover : Ductile Iron EN-GJS-400-15 following EN 1563
      • Retaining disk   Brass CW 612 N according to EN 12164
      • Sealings : NBR
      • Seat ring: Bronze  CuSn5Zn5Pb5-CC491K EN 1982
      • Spring : Steel 55 Si 7 according to EN 10132-4
      • Adjustment screw: Galvanized steel Class 4.8 according to EN 20898-1

      Applicable Standards

      Hydraulic test:

      Every single DRVD is subjected to hydraulic final test with the purpose of verifying the accordance with the prescriptions EN 12266:

      • Body test at max (1,5·PN; PEA) (open valve);
      • Seat test at 1,1·PN (close valve).

      Product test:

      • Control of coating: test of thickness, holiday test, impact test, MIBK test.
      • Conformity to the standards

      Plant test: EN 12266

      • Flanges drilling: EN 1092-2 ISO 7005-2
      • Face to face dimension: ISO 5752-1 for DN 50-125
      • EN 558 series 1 for DN50-125, series 26 for DN150-200
      • Suitability for potable water

      Marking Label on the flange, example, On the body:

      • Material; Flow rate direction; Type: DRVD (DN)