HERZ 4218 VODRV (Ductile Iron Series)

The HERZ 4218 VODRV (Ductile Iron Series) from HERZ Armaturen is a flanged double regulating and commissioning valve designed for high-pressure hydronic balancing. Manufactured from ductile iron (EN-JL 1050), it combines strength with corrosion resistance, ensuring long-term durability under demanding HVAC and process conditions.

The valve includes a non-rising stem, digital handwheel preset display, and two test points for flow verification. With a PN25 rating, it is optimized for large commercial and industrial installations requiring precision control and hydraulic balancing.

  • 🔹 Body & Bonnet: Ductile iron (EN-JL 1050)
  • 🔹 Disc: EPDM-coated ductile iron
  • 🔹 Stem: Stainless steel (AISI 410)
  • 🔹 Nominal Pressure: PN25
  • 🔹 Operating Temperature: -10°C to +120°C
  • 🔹 Connection Type: Flanged (EN 1092-2)
  • 🔹 Sizes: DN65–DN300
  • 🔹 Seal Type: Graphite, asbestos-free packing
  • 🔹 Working Pressure: 25 bar
  • 🔹 Testing Pressure: 37.5 bar (shell) / 27.5 bar (seat)
  • 🔹 Flow Characteristic: Linear
  • 🔹 Preset Display: Mechanical dial indicator
  • 🔹 Medium: Water and glycol mixtures (up to 50%)
  • 🔹 Reliable operation under high pressure and temperature conditions.
  • 🔹 Robust ductile iron construction for long service life.
  • 🔹 Simple, repeatable presetting with digital indication.
  • 🔹 Tight sealing for minimal leakage.
  • 🔹 Easy differential pressure measurement with HERZ test ports.
  • 🔹 Suitable for large-scale HVAC and industrial balancing.
  • 🔹 High-pressure chilled and hot water systems.
  • 🔹 District energy plants and process cooling systems.
  • 🔹 Industrial fluid networks.
  • 🔹 Commissioning and balancing in HVAC plantrooms.
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