Union Bonnet Needle Valve Product Introduction

Definition of Union Bonnet Needle Valve

The union bonnet needle valve is a heavy-duty fluid control component with a robust structure and outstanding sealing performance. It adopts a specialized threaded union bonnet design, which greatly simplifies installation and daily maintenance operations.

This valve is highly adaptable to high-pressure, high-temperature and corrosive medium working environments, and is widely used for precision flow regulation and shut-off control in key industries including petroleum, chemical engineering and natural gas.

Technical Parameters of Union Bonnet Needle Valve

Maximum Operating Pressure by Series & Material

Main Materials of Union Bonnet Needle Valve

• Standard Material: 316 stainless steel

• Optional Materials: Titanium, alloy C-276, alloy 400 and other special alloy materials (customizable upon customer request)

Structural Features of Union Bonnet Needle Valve

• High-Strength Body: Integrally forged valve body for enhanced structural stability and pressure resistance

• Two-Section Valve Stem Design: Upper valve stem threads adopt roll-hardened treatment for wear resistance; lower valve stem surface undergoes special hardening treatment for extended service life

• Anti-Disassembly Design: Union bonnet structure effectively prevents accidental disassembly of the valve, improving operational safety

• Medium Isolation: Lubricant for upper stem threads is completely isolated from system medium, avoiding medium contamination and ensuring pure fluid delivery

• Non-Rotating Lower Stem: The lower valve stem only moves up and down without rotating lifting, reducing packing wear during each stroke and minimizing friction between valve seat and valve head

• Backsealing Function: Equipped with backsealing function in the fully open position, enhancing sealing reliability and protecting the stem assembly

• Flexible Installation: Supports panel mounting for diversified installation scenarios

• Stable Handle: Handles are locked with screws at both ends, ensuring high stability and long-term durability; multiple handle colors are available for selection

• Strict Factory Test: Each valve undergoes professional seal testing before delivery; tested with nitrogen or compressed air (for Series 34) at rated working pressure, or with water at 1.1 times the rated working pressure