Laboratory Borosilicate Glass Two Way Stopcock Valve for Fluid and Gas Flow Control

Product Overview

This laboratory glass two-way stopcock valve provides dependable fluidic isolation and bidirectional rate regulation for analytical chemistry, vacuum line manipulation, and corrosive media handling. Manufactured from premium 3.3 borosilicate glass, the component exhibits near-zero thermal expansion, remarkable hydrolytic stability, and near-universal resistance against aggressive solvents, concentrated mineral acids, and oxidizing reagents. Its inline straight-bore geometry allows effortless incorporation into standard laboratory glassware assemblies, Schlenk lines, and automated fluid distribution networks.

Designed primarily for research laboratories, pilot plant synthesis, pharmaceutical purification, and industrial analytical benches, this valve offers complete visual clarity of the internal flow path. Operators can directly confirm phase interfaces, gas bubble evolution, or potential particulate fouling in real time. The precision ground mating surfaces or alternative fluoropolymer core ensure minimal friction during manual actuation while maintaining a hermetic seal against both moderate positive pressures and continuous high-vacuum conditions.

Rigorous dimensional profiling and stress-relieving annealing cycles guarantee that the unit maintains mechanical integrity under rapid thermal transitions and prolonged chemical exposure. Whether configured in benchtop extraction setups, gas sampling trains, or corrosive chemical delivery lines, the valve ensures consistent sealing performance, operational safety, and reproducible volumetric metering during mission-critical processing routines.

Key Features

• High-Purity Borosilicate 3.3 Construction: Annealed to eliminate residual thermal stress, the glass body features superior chemical inertness to aggressive media and withstands thermal shocks up to 150°C without micro-fracturing or dimensional warping.
• Precision Bore Geometry: The perfectly aligned straight through-bore minimizes flow turbulence, eliminates internal dead volumes, and prevents fluid entrapment, ensuring accurate volumetric dispensing and straightforward flush cleaning.
• Dual Sealing Core Configurations: Available with optically matched ground-glass keys for high vacuum grease-sealed applications or self-lubricating PTFE plugs for contamination-free, completely grease-free chemical routing.
• High Vacuum Integrity: Ground with exacting 1:10 standard tapers to surface roughness tolerances below 0.4 microns, the seating interface reliably supports continuous high-vacuum environments down to 10⁻⁴ mbar.
• Ergonomic Actuation and Retention: Features an integrated positive-locking retaining device and tension nut that prevents accidental plug displacement under system backpressure while maintaining smooth, low-torque 90-degree shutoff actuation.
• Heavy-Wall Cylindrical Arms: Thick-walled side arms resist mechanical stresses associated with flexible tubing clamping, compression O-ring couplings, and direct glassblowing into larger manifold frameworks.
• Optically Clear Flow Inspection: The flawless optical transparency allows immediate visual verification of liquid passage, bubble formation, or precipitation without interrupting ongoing distillation or reaction processes.
• Wide Thermal Operating Span: Built to perform predictably across cryogenic storage down to -20°C and elevated process temperatures up to 200°C without seizure or loss of joint hermeticity.

Applications

Technical Specifications

General Physical and Operational Parameters

Standard Dimensional Variants

Material Compatibility and Chemical Resistance

Why Choose This Product

• Optical Grade Surface Finishing: Every valve barrel and key undergoes microscopic optical lapping to eliminate machining micro-scratches, guaranteeing an ultra-tight seal that prevents costly fluid weeping and dangerous solvent vapor emissions.
• Stress-Relieved Annealing Profile: Components undergo computer-controlled furnace annealing to eliminate internal mechanical strain, drastically reducing the risk of catastrophic cracking when subjected to rapid thermal cycles or continuous vacuum stresses.
• Versatile Media Handling: By isolating the fluid contact surfaces entirely within borosilicate 3.3 glass and optional PTFE cores, this design prevents process contamination, catalytic interference, and corrosion that plague metallic and elastomer valves.
• Dimensional Uniformity for System Integration: Precision external arm tolerances facilitate trouble-free flame fusion by scientific glassblowers or direct installation into elastomeric and fluoropolymer compression fittings without leakage.
• Comprehensive Customization Capabilities: In addition to standard straight-bore configurations, customized stem diameters, specialized ground joint terminations (such as standard taper outer joints or spherical ball sockets), and high-vacuum metering grooves can be manufactured to your precise project specifications.

For technical consultations, custom borosilicate valve assemblies, or bulk volume quotation requests, contact our engineering sales team today to configure the ideal fluid control solution for your laboratory.

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