Needle valve RATE ISO 228 F - 678001 | 4G Ghidini

Needle Valve / Rate Valve 4G Ghidini 678001 – ISO 228 F

The 678001 is a manually operated rate valve with ISO 228 female/female threads, designed for local flow regulation in clean liquid or gas lines. The body is made of AISI 316L / 1.4404, featuring a polished exterior and handwheel. Available in sizes 1/2”, 3/4”, 1”, 1 1/4”, and 1 1/2”.

Technical Specifications

• Connection: ISO 228 F/F
• Nominal Pressure: PN 100 across all available sizes
• Operating Temperature: -20°C to +160°C
• Body, needle, screw, and stopper nut material: AISI 316L
• Sealing: O-ring FKM, PTFE, and PTFE with glass reinforcement
• Handwheel, washer, nut: AISI 304L

Operational Use

The rate valve is utilized for manual flow adjustment with small openings, rather than simple on/off isolation. Adjustment is influenced by differential pressure, viscosity, temperature, and line losses; hence, it should not be considered a flow measurement device.

Typical Applications

• Low-flow bypass
• Instrument and auxiliary circuit lines
• Sampling of clean liquids
• Flow trimming in process skids
• Clean water, air, nitrogen, or chemicals compatible with 316L/FKM/PTFE

Not suitable as a primary choice for slurries, suspended solids, or viscous products due to restricted flow path and clogging sensitivity.

Standards and Options

Upon request, an ATEX II 2G Ex h IIC T4 Gb / II 2D Ex h IIIC T135°C Db antistatic device and M.O.C.A. CE 1935/2004 compliance for food contact applications are available.

FAQ

When to choose the 678001 over a simple needle valve?
When the application requires more systematic manual flow adjustment in an ISO 228 and PN 100 line.

What should be checked before selection?
Thread size, pressure, temperature, media compatibility, and potential clogging by solids.