Working principle of needle valve

The purpose of any valve is to cut off the fluid. According to the different spool, it can be divided into globe valve, gate valve, plug valve, ball valve, butterfly valve and needle valve. Needle valves can withstand greater pressure and have better sealing performance than other types of valves, so they are generally used to seal gas or liquid media with smaller flow and higher pressure. Needle valves are most suitable for use with pressure gauges. In general, needle valves are made into threaded connections. Nominal pressure: pn 2.5pn4pn6.4pn16pn32mpa Nominal diameter: DN5~DN25 Applicable media: non-corrosive or corrosive media such as oil, water and gas Applicable temperature:-20℃ ~+440℃ ~-240℃ ≤ 540℃ and other manufacturing materials: