Needle Valves

Needle valves within a block and bleed function help achieve positive isolation within maintenance operations of a live process plant. 

needle valvesThese work well in non-critical processes like with non-hazardous fluids or a low-pressure system. The small port and needle-shaped threaded plunger allows for precise flow regulation in low flow applications. Not only for maintenance, but needle valves also work well in flow-metering operations and are especially good at maintaining a calibrated and constant low flow rate.

Rugged and compactly designed, Hy-Lok offers a wide range of sizes (1/8″ to 1″), and stem tips (v-stem, regulating, and soft seat) that work well for a variety of applications, including hydraulic and pneumatic systems. Of 316 stainless steel as standard, and some as alloy 400, Hy-Lok needle valves are meticulously designed for the flow, temperature and system required. Common applications include pharmaceuticallife support, and oil & gas.

End connection options include male / female NPT, Hy-Lok tube fittings, and ISO threads from 1/8″ to 1″. Available in stainless steel, carbon steel, brass, and alloy 400. With pressure rating to 10,000 psi and temperatures up to 1,200°F, Hy-Lok has a needle valve solution to meet your needs. For more information, find a Hy-Lok distributor in your area.


Needle Valve Materials

  • Body - 316 cold worked stainless steel
  • Packing - Glass filled Teflon
  • Stem - 17 - 4 PH

NPT Needle Valve Specifications:

  • MAWP up to 60,000 psig (4136 bar)
  • Temperature Ratings: -100°F to 600°F (-73°C to 316°C)
  • Quick Turn Needle Valve is optional

NPT Needle Valve Features & Benefits

  • Standard valve fully opens in as little as 3 1/3 turns / Quick turn needle valve (1 3/4 turns).
  • Solid stainless steel handle
  • Stem is lifted off the seat more than 2x faster than conventional valves, which reduces throttling and therefore increases seat life. (Quick Turn Needle Valve)
  • Less than half of the number of turns to fully open compared to competitor's valves. Less operator fatigue when opening/closing. (Quick Turn Needle Valve)
  • Stainless steel captive fixing screw with stainless spring for easier handle removal. Eliminates dropped or mislplaced fixing screw.
  • 4-sided tapered stem for maximum handle contact. No chance of the handle slipping or loosening on stem.
  • Two-piece, heavy duty, non-rotating stem for a robust and reliable assembly.
  • Bi-directional flow capability. Simplifies system designs.
  • Packing gland/body thread interface consists of a preload locking internal thread form that is resistant to vibration. Eliminates the need for an external locking device.
  • Double sided weep holes for easier leakage verification.
  • Complete material traceability.


If you have any questions about any of our products or services, don’t hesitate to give us a call. For any inquiries, fill out the form and one of our Hy-Lok representative will contact you soon.


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