Article IntroductionAfter the release and implementation of the new national standard (GB 5749-2022), two odor and taste indicators, namely 2-Methylisoborneol (2-MIB) and Geosmin, have become mandator...
23 Jun,2026
JieKeLong's needle valves are designed for precision flow metering and fine throttling control in high-pressure fluid systems. Key applications include instrumentation gauge isolation, hydraulic system calibration, refrigerant charging lines, chemical dosing systems, and fuel flow regulation in aerospace/automotive testing. They play an essential role in ensuring precise flow stability under critical pressure conditions and micro-adjustment capability across laboratory and industrial process systems.
Needle valves enable precise flow metering via micrometer-like adjustment of a tapered needle and seat interface.
They provide bubble-tight shut-off capability at high pressures (>6000 psi), preventing leakage in critical instrumentation systems.
Minimal flow coefficient (Cv < 0.1) when throttled due to fine-thread stem and conical orifice design.
Hardened stainless-steel needles and CNC-machined seats ensure erosion resistance and long-term sealing integrity in high-pressure steam, gas, or chemical systems.
Prepare pipe/tube ends with smooth, debris-free surfaces. Apply high-pressure thread sealant to male tapered threads (BSPT/NPT). For instrumentation lines, verify needle tip and seat integrity using magnified inspection to prevent micro-leaks.
Install valve with stem axis accessible for adjustment. Hand-tighten threaded joints, then wrench-tighten 1.25-1.75 turns. For high-pressure systems (>3000 psi), use backup wrenches on valve body hex flats – never apply torque to the stem or handwheel.
Maintain minimum 10x diameter laminar flow run upstream. Over-tightening may deform the tapered needle or crack the seat, causing throttling inaccuracy. Under-tightening risks high-pressure blowouts. Conduct bubble-test at 1.25x working pressure post-installation to verify micro-seal integrity.
Rotating the handwheel clockwise drives the fine-threaded stem vertically, advancing a tapered needle gradually into a conical seat to restrict or seal the flow path.
When fully retracted, the needle permits unobstructed flow through the orifice; complete closure achieves metal-to-metal sealing by wedging the needle tip against the seat.
Sealing effectiveness relies on precise conical surface contact, with system pressure enhancing shut-off integrity by forcing the needle tighter into the seat.
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