HERZ DZR 2-Way Control Ball Valve

The HERZ DZR 2-Way Control Ball Valve (series 2117) is a high-performance, linear-characteristic control valve designed for continuous regulation of hot and cold water, or air, in closed circuit systems. Constructed from dezincification-resistant (DZR) copper alloys, the valve ensures superior corrosion resistance and long-term operational reliability in demanding HVAC and hydronic environments.

Its V-shaped machined ball bore allows for precise flow control and linear response characteristics, while PTFE (Teflon) seats and EPDM O-rings provide tight sealing and low torque operation. The spindle design includes a double O-ring sealing arrangement for maximum durability and leak-free performance.

The valve body and internal components are engineered for smooth actuation, with minimal torque requirements (<8 Nm at nominal voltage), enabling efficient integration with HERZ electric actuators (available in 2/3-point and modulating versions). When manual operation is required, an optional HERZ handle (1 2100 90) can be installed across all sizes DN15–DN50.

  • 🔹 Body Material: DZR copper alloy (CW602N), EN 12420
  • 🔹 End Connections: DZR copper alloy (CW602N), internal threads ISO 7-1
  • 🔹 Ball: DZR copper alloy (CW602N), V-shaped bore, chrome plated, micro-finished
  • 🔹 Ball Seat: PTFE (Teflon) with EPDM O-ring
  • 🔹 Spindle: DZR copper alloy (CW614N)
  • 🔹 Spindle Sealing: Double EPDM O-rings
  • 🔹 Spindle Seat: PTFE (Teflon)
  • 🔹 Nominal Size Range: DN15 – DN50
  • 🔹 Nominal Pressure: PN40 (DN15–DN25), PN25 (DN32–DN50)
  • 🔹 Operating Temperature: -10 °C to +110 °C
  • 🔹 Medium: Cold/hot water or water-glycol mixtures (max. 50% glycol)
  • 🔹 Provides accurate linear flow control for efficient system regulation.
  • 🔹 High reliability and tight shut-off due to precision-machined chrome-plated ball and PTFE sealing system.
  • 🔹 Low operating torque minimizes actuator wear and energy demand.
  • 🔹 Corrosion-resistant DZR alloy ensures extended service life in aggressive water conditions.
  • 🔹 Compact and versatile design suitable for both automated and manual operation.
  • 🔹 Wide control ratio (500:1) supports precise modulation across varying loads.
  • 🔹 Easy retrofit capability with standardized HERZ actuators and handles.
  • 🔹 Leak-free operation ensured by double O-ring spindle sealing.
  • 🔹 Heating, ventilation, and air-conditioning (HVAC) systems.
  • 🔹 Hydronic heating and cooling circuits.
  • 🔹 District energy and building automation systems.
  • 🔹 Water-based closed loop systems (chilled or hot water).
  • 🔹 Glycol-based systems (up to 50% glycol concentration).
  • 🔹 Suitable for precise flow control in commercial, industrial, and residential installations.
Request Info

Other Products From HERZ Armaturen