Needle valve is a kind of valve that can be adjusted accurately and has a wide range of uses, such as the separation used for flame cutting. The rotary valve that adjusts the flame temperature is needle valve, and its types are as follows:
1. It can be divided into block valve, check valve, three valve manifold, regulating valve and diverter valve according to the purpose
2. It can be divided into vacuum valve, low-pressure valve, medium pressure valve and high-pressure valve according to the different nominal pressures in use,
3. According to the working temperature during normal use, it can be divided into: ultra-low temperature valve, low temperature valve, normal temperature valve, medium temperature valve and high temperature valve
4. According to the different structural shapes of instrument valves, they can be divided into: stop gate shape, plug shape, plug valve, swing valve, butterfly valve and slide valve
5. According to the materials used for instrument valves, they are divided into: metal instrument valves, medium diameter instrument valves, large diameter instrument valves, and extra large diameter instrument valves
6. According to the diameter of the fluid passing through the instrument valve, it can be divided into: small diameter instrument valve, medium diameter instrument valve, large diameter instrument valve and extra large diameter instrument valve
7. According to the different connection methods between instrument valves and other pipe fittings, it can be divided into: threaded connection instrument valves, flange connection instrument valves, welding connection instrument valves, clamp connection instrument valves, ferrule connection instrument valves, and clamp connection instrument valves
8. According to the different braking methods, it can be divided into: automatic valve, which is also divided into pressure reducing valve, drain valve, check valve, automatic regulating valve, drive valve, and drive valve. According to different power sources, it can also be divided into electric valve, pneumatic valve, hydraulic valve, pneumatic valve, electric valve, and manual valve
