DIN Type Needle Valve/Brass Needle Valve

Needle valve is a kind of throttle valve, the adjustment accuracy is relatively high.

The valve is needle-like, moving along the flow direction, changing the overcurrent area, used to truncate or regulate the flow of valves. Needle valve is a kind of fine-tuning valve, its valve plug is needle shape, mainly used to adjust the amount of airflow. The fine-tuning valve requires the valve port to open gradually larger, from the shutdown to the opening can be continuously and slightly adjusted. This function can be achieved by needle-shaped valve plugs. Needle-shaped valve plugs are generally made of hardened steel long needles, while the seat is manufactured from soft materials such as tin and copper. The seal between the valve needle and the seat is achieved by the close coordination of its conical surface. The taper of the valve needle has 1:50 and 60 conical angles, and the conical surface should be finely ground.
 The seal between the stem and the seat is achieved by a corrugated pipe.