Since 1996, when the Haghighi Gas Valve factory launched in the Kashan Industrial City, this Iranian brand has built a solid reputation in brass valves. Haghighi’s threaded ball valves use CW617N brass, hard nickel–chrome plating, and PTFE O-rings engineered for heat and corrosion resistance—delivering long service life in residential, commercial, and industrial use.
Production Process & Quality Control
- Hot forging: Brass billets are hot-forged at ~700 °C in steel dies to create a dense, porosity-free body.
- CNC precision machining: Ball seat, threads, and O-ring grooves are turned to an 8 µm tolerance to ensure zero leakage.
- Plating & passivation: A bright 10 µm nickel layer adds wear resistance; a thin 0.4 µm chrome layer prevents tarnishing.
- Pressure testing: Each valve is 100% individually tested to ISIRI 3664—20 bar hydrostatic and 50 bar pneumatic.
Table 1 – Size Range & Operating Conditions (Haghighi Valves)
| Nominal size (in) | Rated flow (m³/h) | Permissible PN (bar) | Max. fluid temp (°C) |
|---|---|---|---|
| ½ | 4.8 | 16 | 120 |
| ¾ | 7.2 | 16 | 120 |
| 1 | 11.5 | 25 | 120 |
| 1¼ | 18.0 | 25 | 120 |
| 1½ | 27.0 | 25 | 120 |
| 2 | 45.0 | 25 | 120 |
| 2½ | 70.0 | 16 | 120 |
| 3 | 95.0 | 16 | 120 |
| 4 | 160.0 | 16 | 120 |
Design Features & Application Benefits
- Floating ball with mirror finish (Ra ≤ 0.2 µm) keeps the lever smooth even after 20,000 cycles.
- Blow-out-proof stem per EN 331 prevents stem ejection under sudden overpressure.
- Flow-direction indicator on the body simplifies reading and installation.
- Vinyl-sheathed steel lever reduces heat transfer to the user’s hand.
- Parallel BSP threads (both ends) allow direct connection to Schedule 40 seamless pipe or high-pressure threaded fittings.
Standards & Certifications
Haghighi valves carry the Iran National Standard mark (ISIRI 3664) and Engineering Organization approval, enabling use on city gas networks, liquid-phase LPG lines, compressed air, and non-corrosive industrial liquids. Helium leak tests per DIN 3230 and a 20,000-cycle endurance test per ISO 5211 are conducted by an accredited laboratory.
Installation, Commissioning & Maintenance
- Clean male threads with a brass brush; PTFE tape up to 0.1 mm is sufficient for sealing.
- Apply torque only to the body hex; never use the lever as an extension.
- During annual gas-network checks, lubricate the stem with silicone spray and check for leaks with soap foam.
- If ambient temperature drops below −10 °C, wrap the body with 9 mm elastomeric insulation to prevent ball freeze-up.
Table 2 – Haghighi vs. Common Market Alternatives (Iran)
| Metric | Haghighi | Domestic Brand A | Imported Brand B |
|---|---|---|---|
| Body material | CW617N brass | Recycled brass | CW602N brass |
| Manufacturing | Hot forging + CNC | Sand casting | Cold forging |
| Plating | 10 µm nickel + 0.4 µm chrome | 4 µm nickel | 8 µm nickel |
| Test pressure (bar) | 50 | 30 | 45 |
| Warranty (years) | 5 | 2 | 3 |
Typical Applications in Building Projects
- Apartment unit inlet (1″): periodic replacement recommended due to high cycling.
- Main building riser (2″): installed as an easily accessible emergency shut-off.
- Sub-metering in commercial complexes: ¾″ and 1″ sizes for each retail unit.
- Central heating systems: Haghighi PTFE-seated models handle 90 °C water.
Haghighi valves are available nationwide through authorized distributors—including Tamambaha—with full coverage from ½″ to 2″ and access to expert technical consultation.
