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The Butterfly valve HF2 - 2 inch is the DN50 version of UNITECH S.R.L.’s HF2 double-eccentric butterfly valve family. It is designed as a compact quarter-turn isolation valve for controlling the passage of liquids and gases in industrial and utility piping. The double-eccentric arrangement separates the shaft axis from the disc center, helping reduce unnecessary contact between the sealing surfaces during opening and closing.
For the 2-inch designation, the nominal diameter is DN50. The HF2 family is documented for DN50 to DN300 and pressure classes PN10, PN16, PN25, PN40 and ANSI 150. The valve supports operating temperatures up to 180 °C, subject to the selected materials and service conditions. The exact DN50 datasheet entry gives a flow coefficient of Kv 100 m³/h, face-to-face dimension L 43 mm, H1 160 mm and an ISO 5211 F07 mounting interface.
The HF2 range is available with body and disc materials including EN 1.4408 / AISI 316 stainless steel and EN 1.0619 / WCB carbon steel. The standard seat material is PTFE. Material selection should be made against the actual fluid, pressure, temperature and installation environment rather than treating one material combination as universal.
The family is available in wafer and lug executions. ISO 5211 mounting allows integration with suitable quarter-turn actuators, while manual operating arrangements can be selected according to the valve size and application. This makes the HF2 suitable for both manually operated isolation points and automated flow-control packages.
UNITECH identifies applications across industrial and civil installations, HVAC, naval systems, chemical and food processing, fire-protection installations, water treatment, and isolation of fumes and exhaust gases. The compact butterfly format provides a practical solution where low installation space and quarter-turn operation are important.
The HF2 documentation references EN 12516, EN 593, ISO 5211, EN 558, EN 1092, API 609 and API 598. The product page also states suitability up to PED class I and for ATEX zones 1, 2, 21 and 22. Final valve selection must consider the actual pressure-temperature envelope and media compatibility.
| Feature | Specification |
|---|---|
| Product Family | HF2 double-eccentric butterfly valve |
| Nominal Diameter | DN50-DN300 |
| Pressure Class | PN10, PN16, PN25, PN40, ANSI 150 |
| Maximum Operating Temperature | up to 180 °C |
| Execution | wafer or lug. Typical |
| Body Material | EN 1.4408 (AISI 316 stainless steel), EN 1.0619 (carbon steel WCB). Typical |
| Disc Material | EN 1.4408 (AISI 316), EN 1.0619 (WCB). Seat material listed on the current product page: PTFE |
| Applications | industrial, civil, HVAC, naval, chemical, food, fire protection, water treatment, and exhaust-fume/gas isolation |
| Standards | EN 12516, EN 593, ISO 5211, EN 558, EN 1092, API 609 and API 598; |
| DN50 Datasheet Values | Kv 100 m³/h; face-to-face L 43 mm; H1 160 mm; ISO 5211 F07; construction/testing references EN 12516, EN 593, ISO 5211, EN 558, EN 1092, API 609 and API 598; |
| PED / ATEX Certification | PED class III in Q version. |
| PED / ATEX Certification | PED class I and ATEX zones 1, 2, 21 and 22 are stated on the product page. |
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