Materials
- Body: cast iron EN-GJL 250 (GG25).
- Disc: stainless steel 1.4301 / AISI 304.
- Stem: stainless steel 1.4021 / AISI 420.
- Seat: EPDM.
Gear Operated Butterfly Valve
HERZ 4219 AF Lug Gear Butterfly Valve
4219 AF Series — Cast Iron Lug Type, DN350–DN600
HERZ 4219 AF from HERZ Armaturen is a cast iron lug type butterfly valve with gear operation for end-of-line and sectional isolation in high-capacity HVAC and water systems, available from DN350 to DN600.
Manufactured by
HERZ Armaturen
HERZ 4219 AF Lug Gear Butterfly Valve
Review the confirmed product information, including description, features, benefits, and applications.
The HERZ 4219 AF Lug Type Gear Operated Butterfly Valve from HERZ Armaturen is engineered for reliable shut-off in high-capacity HVAC and water systems. Its threaded lug connections allow end-of-line or sectional installation.
The gear-operated mechanism ensures precise control, while the cast iron EN-GJL 250 body, stainless-steel disc, and EPDM seat deliver durability and tight sealing. The valve follows EN 1092-2 flange standards and is epoxy coated for corrosion protection.
Pressure & Temperature
- Max. pressure: 16 bar (water).
- Temperature range: -20°C to +110°C.
- Medium: water and water/glycol mixtures up to 50%.
Connection & Sizes
- Lug type with threaded lugs, flanges to EN 1092-2.
- Suitable for end-of-line and sectional installation.
- Sizes DN350 to DN600.
Operation & Coating
- Worm gearbox operation; also usable with actuators.
- Operating torque: 510–1035 Nm depending on size.
- Kv values from 10,421 to 27,502 m³/h.
- Electrostatic powder epoxy coating.
Sizes, Dimensions & Flow
Dimensions in mm. L = face-to-face length. Per HERZ datasheet for wafer and lug types, gear operated.
| DN | L (mm) | Torque (Nm) | Kv (m³/h) |
|---|---|---|---|
| 350 | 78 | 510 | 10,421 |
| 400 | 102 | 630 | 12,146 |
| 450 | 114 | 690 | 16,863 |
| 500 | 127 | 860 | 22,795 |
| 600 | 154 | 1035 | 27,502 |
End-of-Line Service
Lug-type body suitable for end-of-line service and sectional isolation.
Easy Manual Operation
The gearbox ensures easy manual operation of large valve sizes.
High Durability
High durability under pressure and temperature variations.
Low Operating Torque
Low torque requirement relative to the large valve diameters.
Flanged Pipeline Compatibility
Compatible with flanged pipelines to EN 1092-2.
HERZ 4219 AF is suitable for high-capacity mains where secure end-of-line or sectional isolation is required.
District Cooling & Heating Mains
District cooling and heating networks and HVAC mains.
Process Pipelines
Industrial process pipelines.
Pump & Section Shut-Off
Pump isolation and section shut-off points.
Distribution & Treatment
Water distribution and treatment systems.
Need support with this butterfly valve?
Share your required DN size, system medium, operating temperature, and installation type, and our MEP team will support you with the suitable product information. Contact us for sizes below DN350.
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