Definition of Angle Needle Valve

An angle needle valve is a precision fluid control valve with a special right-angle structure. Its working principle is derived from the design of standard globe valves, but it realizes accurate flow control and reliable sealing through a unique 90° right-angle flow passage structure and a specialized needle-shaped valve core, adapting to special pipeline layout and high-precision control demands.

Working Principle of Angle Needle Valve

The angle needle valve achieves fluid on-off control and precise flow regulation through the vertical lifting movement of the needle-shaped conical valve core. The valve core moves strictly along the fluid centerline; when the handwheel is rotated, the valve stem drives the needle-shaped valve core to make sealed contact with the conical surface of the valve seat or separate from it:

• Closed State: Rotate the handwheel clockwise, the valve core is pressed down vertically and fits tightly with the conical surface of the valve seat, forming a stable conical surface seal to completely block fluid circulation and achieve zero leakage.

• Open State: Rotate the handwheel counterclockwise, the valve core rises steadily to form a tiny and controllable flow gap, and fluid flows through the gap; the medium flow rate increases synchronously as the valve opening degree rises, realizing stepless flow regulation.

Structural Characteristics of Angle Needle Valve

• Right-Angle Flow Design: The inlet and outlet ports are distributed at a standard 90° right angle, which is specially suitable for narrow space pipeline layouts or pipelines requiring direction change, effectively reducing the use of pipe elbows and simplifying the overall pipeline structure.

• Precision Needle-Shaped Valve Core: The taper of the valve core is usually designed at 5°~30°, and the slender and precise structure enables micron-level ultra-fine flow regulation, making it particularly applicable to high-pressure, low-flow working scenarios (e.g., micro flow control at 0.1mL/min).

• Diversified Sealing Types: Adopts metal hard sealing (such as stainless steel hard seal) or high-performance soft sealing materials (PTFE, graphite), ensuring zero leakage under ultra-high pressure up to 26.5MPa and stable adaptability to various corrosive media.

Usage Instructions for Angle Needle Valve

• Lifting and Rotating Rod Structure: Adopts a lifting and rotating rod type design, the handwheel and valve stem rotate and lift synchronously, with the adjusting nut fixed to the valve body, ensuring easy and labor-saving operation and low operating torque.

• Dual Sealing Protection System: Most high-performance models are equipped with a professional packing seal (such as high-temperature graphite) and a high-precision O-ring, effectively preventing medium leakage from the valve stem and resisting loosening caused by long-term vibration.

• Wide Pressure & Temperature Adaptability: The valve body is made of high-quality alloy materials including 316 stainless steel and Hastelloy, with a wide operating temperature range from -45°C to 450°C, suitable for harsh industrial environments such as high-temperature steam pipelines and acid-base corrosive media.

Application Fields of Angle Needle Valve

• High-Pressure Fluid Systems: Widely used in high-pressure instrument pipelines (6000PSI) in petrochemical industry, power boiler feedwater control and other high-pressure transmission systems.

• Precision Flow Control Scenarios: Applied to precision laboratory equipment (such as gas chromatographs) and semiconductor manufacturing (high-purity gas micro regulation) requiring high-precision flow control.

• Hazardous Medium Safety Pipelines: Equipped with fire-resistant and explosion-proof design, suitable for safe control of pipelines carrying hazardous media such as coal gas and natural gas, meeting strict industrial safety standards.