Definition of Union Bonnet Needle Valve

The union bonnet needle valve is a fluid control component with a robust structure and excellent sealing performance. It adopts a threaded union bonnet design, facilitating installation and maintenance. Suitable for high-pressure, high-temperature, and corrosive medium environments, it is widely used in precision flow regulation in industries such as petroleum, chemical engineering, and natural gas.

Technical Parameters of Union Bonnet Needle Valve

Product Type: Union Bonnet Needle Valve

Series 11: Maximum Operating Pressure up to 6000 psig

Series 11H: Maximum Operating Pressure up to 10000 psig

Structural Features of Union Bonnet Needle Valve

Integrally forged valve body

Two-section valve stem design: The threads of the upper valve stem undergo roll-hardened treatment, and the surface of the lower valve stem undergoes special hardening treatment

Union bonnet structure prevents accidental disassembly of the valve

Lubricant for the upper stem threads is isolated from the system medium

The non-rotating lower valve stem moves up and down instead of rotating and lifting, reducing packing wear during each stroke and minimizing friction between the valve seat and valve head

The valve features a backsealing function in the fully open position

Panel mounting capability

Handles are locked with screws at both ends, ensuring stability and durability

Multiple handle colors available

Each valve undergoes seal testing before leaving the factory: tested with nitrogen or compressed air (for Series 34) at the rated working pressure, or with water at 1.1 times the rated working pressure

Main Materials of Union Bonnet Needle Valve

316 stainless steel, titanium, or other alloy materials (available upon customer request)

Maximum Operating Pressure by Series & Material

Series 11:

Stainless Steel: 414 bar (6000 psig)

Alloy C-276: 414 bar (6000 psig)

Alloy 400: 345 bar (5000 psig)

Titanium: 241 bar (3500 psig)

Series 11H:

Stainless Steel: 690 bar (10000 psig)