GB Series – Union Bonnet Needle Valves Hy-Lok Korea

What is GB Series Needle Valve?

The GB Series is a line of Union Bonnet Needle Valves manufactured by Hy-Lok, specially designed for:

• Corrosive environments
• High-temperature applications
• High-pressure systems
• Hydrogen applications
• Industrial drain and vent systems

The valve is widely used in oil & gas, chemical processing, and instrumentation systems requiring high safety standards.

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Key Features of GB Series

• Robust Union Bonnet construction
• Available in In-Line or Angle Pattern
• Suitable for high temperature and high pressure service
• High-temperature graphite packing
• Durable metal-to-metal seat design
• Back seat stem for enhanced operational safety
• Excellent corrosion resistance

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Applications of GB Series Needle Valve

The GB Series valve is widely used in:

• Corrosive chemical systems
• Thermal power plants
• High-pressure steam systems
• Hydrogen service applications
• Radioactive and hot condensate systems
• Instrument drain and vent applications

👉 Important Note:
The valve is mainly designed for:

• Drain service
• Vent service

It is not intended to be used as the primary shut-off valve.

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Technical Specifications

Maximum Operating Pressure

• Up to:
  • 35 MPa
  • 6,000 psig (413 bar) @ 100℉ (38℃)

Operating Temperature Range

• From:
  • -65℉ (-54℃)
• To:
  • 1000℉ (537℃)

Materials

• Stainless Steel S316
• ASTM A479
• Alloy 400 (Monel)
• A105 Carbon Steel

Sealing Options

• High Temperature Graphite Packing
• Metal-to-Metal Seat

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Structure of GB Series Needle Valve

Valve Body

• Designed for high-pressure applications
• Excellent corrosion resistance in chemical environments

Union Bonnet

• Improves sealing performance and mechanical strength
• Easier maintenance and component replacement

Graphite Packing

• Withstands extremely high temperatures
• Minimizes leakage under harsh conditions

Back Seat Stem

• Enhances operational safety
• Protects the packing under high-pressure conditions

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Working Principle

The valve operates by:

• Rotating the handle to move the stem
• The needle-shaped stem creates a small opening for flow regulation
• When fully closed, the stem presses against the seat to stop flow completely

👉 Fine-thread stem design provides smooth and highly accurate flow control.

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Advantages of GB Series Hy-Lok Needle Valve

• Excellent high-temperature resistance
• Superior corrosion resistance
• Reliable metal-to-metal sealing
• Safe operation with back seat stem design
• Long service life
• Suitable for hydrogen and hazardous chemical applications

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Technical Documentation

• Product Catalog PDF
• Installation & Operation Manual
• Assembly Torque Data
• GA Drawings / 3D STEP Drawings

👉 Contact us for technical documents:
📧 sales1@pm-e.vn

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About Hy-Lok Korea

Hy-Lok is a globally recognized manufacturer specializing in:

• Instrument Valves
• Needle Valves
• Tube Fittings
• High Pressure Valves

Its products are widely used in oil & gas, chemical, and energy industries worldwide.

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Authorized Distributor in Vietnam

THEGIOIVAN.NET
📞 +84 903 601 875
📧 sales1@pm-e.vn

We supply many industrial valve brands:
Hy-Lok, S-LOK, KSPC, KITZ, Swissfluid, VENN, TOYO, LESER, EBRO, TANKTECH, and more.

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Conclusion

The GB Series Needle Valve by Hy-Lok Korea is an ideal solution for high-pressure drain and vent systems operating in high-temperature and corrosive environments. With Union Bonnet construction, high-temperature graphite packing, and superior corrosion resistance, the valve is highly suitable for demanding industrial applications.