The ball of the fixed ball pneumatic ball valve is fixed and does not move after being pressed. The fixed ball pneumatic ball valves are equipped with floating valve seats. After the pressure of the medium, the valve seats will move, making the seal ring tightly press on the ball to ensure sealing. Generally, bearings are installed on the upper and lower shafts of the ball, and the operating torque is small. It is suitable for valves with high pressure and large diameter. In order to reduce the operating torque of pneumatic ball valve and increase the reliability of sealing, oil sealed pneumatic ball valve has appeared in recent years. It not only injects special lubricating oil between sealing surfaces to form an oil film, which not only enhances the sealing performance, but also reduces the operating torque. It is more suitable for high-pressure and large caliber pneumatic ball valves.

Pneumatic butterfly valve is not installed. The correct method is overbearing
Scope of application: flexible walk pipes are required to avoid vibration, and steam, gas, air, heavy oil, petroleum, chemicals, etc. are used. However, if they are not installed correctly, their life will be reduced, resulting in a large part of waste.
In the process of implementing the device, considering that using a ruler to measure the length of the hose according to the calculation results and then stopping the device may affect the consumption efficiency, some foreign consumers directly install the ruler on the hose and cut off the ruler after installation. The pneumatic butterfly valve can be installed vertically or obliquely. The most ideal state is the vertical device. At the same time, the device should be prevented from being near the left of the wheel. If necessary, a baffle can be installed.
Generally, pneumatic butterfly valves can be divided into three lengths: the first is the tightening length, that is, the length when the hose is tightened to the limit position; The second is the length of the device, which is the length of the hose when it is in the middle of half of the maximum displacement; The third is the stretching length, which is the length when the hose is stretched to the maximum limit. When the pneumatic butterfly valve is installed, the hose should be in the middle position, which is called the device length. Under the device state at this position, when the hose is subjected to axial load, it can move in two directions. Otherwise, if it can only move in one direction, it will affect the strength of the pneumatic butterfly valve and reduce its service life.