The use of continuous glass fiber cloth instead of traditional chopped fiber as a reinforcement material can greatly increase the percentage of glass fiber in GRP and the reinforcement effect. Glass fiber is the main load-bearing part of FRP, and the increase of glass fiber content will mean the improvement of the overall mechanical properties of FRP.

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.