The KOFLOC Model 2412L Series Precision Needle Valve (comprising ordering flow configurations: 2412L-SS-1/4-AIR-01, 2412L-SS-1/4-AIR-010, and 2412L-SS-1/4-AIR-0100) is 100% engineered, precision-machined, and assembled in Japan by KOFLOC Corp. (Kojima Instruments Inc.) – an internationally recognized technological pioneer with more than 75 years of specialized innovation in micro-flow fluidics and analytical measurement instrumentation. Engineered as an enduring global standard for critical flow control, the Model 2412 delivers exceptionally smooth, stable, and reproducible flow metering across demanding scientific and industrial gas networks.

The core engineering breakthrough of the KOFLOC Model 2412L lies in its proprietary non-rotary needle mechanism. In conventional needle valves, the regulating screw and needle rotate together, causing rotational friction against the orifice seat that results in galling, seat distortion, particle generation, and flow drift. In contrast, KOFLOC’s innovative design isolates the screw rotation and transforms it into purely linear, non-rotating axial displacement of the needle stem. This mechanism completely eliminates rotational wear on the orifice and needle tip, suppresses thread play and backlash vibration, and significantly enhances operational longevity. The fine-pitch regulating spindle provides approximately 12 full turns of resolution, allowing technicians to dial in ultra-minute gas flows with superior linearity and hysteresis-free restorability.

Constructed in the premium "SS" specification, all wetted components are machined from high-grade SUS316 stainless steel, complemented by fluorocarbon resin (PTFE/PCTFE) packing and high-durability FKM (Viton) elastomeric seals. This metallurgy provides superior chemical corrosion resistance, a maximum operating pressure rating of 1.0 MPa (10 bar / 145 psi), and an extended operating thermal range up to 120 °C. The L-shaped (angle flow path) body configuration with standard Rc 1/4 female ports enables convenient 90-degree pipeline routing and streamlined panel-mount integration. Covering distinct rated maximum flow capacities—Model 01 (up to 1 L/min), Model 010 (up to 10 L/min), and Model 0100 (up to 100 L/min)—the KOFLOC 2412L Series is the premier choice for gas chromatography systems, semiconductor fabrication, vacuum coating equipment, and precision gas-mixing analyzers worldwide.

• Manufacturer: KOFLOC Corp. (Kojima Instruments Inc.)
• Origin: 100% Japan (Kyoto, Japan)
• Product Series: Precision Needle Valve with Non-Rotary Needle Mechanism
• Body Configuration: Model 2412 Series (Angle type body / 2412L)
• Specific Model Designations & Flow Ranges (Air at 20 °C, DP = 0.1 MPa):
  - Model 2412L-SS-1/4-AIR-01: Maximum rated control flow rate up to 1 L/min (1,000 mL/min)
  - Model 2412L-SS-1/4-AIR-010: Maximum rated control flow rate up to 10 L/min
  - Model 2412L-SS-1/4-AIR-0100: Maximum rated control flow rate up to 100 L/min
• Spindle & Needle Architecture: Proprietary non-rotating linear motion structure (pure axial needle stroke)
• Number of Regulating Screw Turns: Approx. 12 turns for ultra-fine micro-metering resolution
• Compatible Fluid Media: Clean compressed air (AIR), inert & carrier gases (N2, Ar, He, H2, O2, CO2...), and pure liquids (H2O)
• Fluid Contact Materials (Wetted Parts - "SS" Specification):
  - Valve Body & Needle: SUS316 Stainless Steel
  - Packings & Seals: Fluorocarbon resin (PTFE / PCTFE)
  - O-Rings: Fluoroelastomer FKM (Viton)
• Connecting Port Size: Standard Rc 1/4 female thread (BSPT)
• Flow Geometry: L-Type (Angle body configuration with 90° fluid path)
• Maximum Operating Pressure: 1.0 MPa(G) (approx. 10 bar / 145 psi)
• Maximum Operating Temperature: Up to 120 °C for SUS316 ("SS") version
• Mounting Style: In-line pipeline connection or front panel mounting (via Ø 13 mm panel cutout hole)
• Compliance & Cleanliness: RoHS compliant, high internal cleanliness suitable for analytical and ultra-pure processes
• Available Options: Mechanical lock-nut against unauthorized tampering, multi-dial digital rotary indicator (Model 2412M Series)
• Applicable Industries & Systems: Gas chromatography (GC) and environmental monitoring analyzers, semiconductor manufacturing and wafer processing, vacuum deposition systems (PVD/CVD), mass spectrometers, laboratory reference gas blending equipment, medical gas delivery apparatus, and high-precision industrial pneumatic control panels.