; 2 The main factors affecting the tightness of pneumatic ball valves The main factors affecting the tightness of pneumatic ball valves are the roughness of the sealing surface and the roundness of the ball. As we all know, no matter how advanced processing technology is used, it is impossible to completely eliminate the roundness error of the sphere and the micro defects of the sealing surface. Therefore, in order to achieve a good sealing effect and ensure that the processing process can be achieved, it is necessary to determine appropriate sealing surface roughness and ball roundness parameter values. Relevant data recommend that the maximum allowable roughness Ra value of the ball sealing surface is 0.4; The maximum allowable roughness Ra value of the seal seat is 0.8 when PTFE is used as the sealing material. The roundness tolerance of spherical surface shall be in accordance with Level 6 accuracy in Table 2 of GB/T1184.

Why does the ripple compensator pull off?
As the stainless steel bellows compensator needs to adjust the installation of the pull rod attached to the metal compensator to its compensation range after the completion of the device, rather than remove all the installation.
It is unnecessary to set the fixed pipe support when the pipeline is under pressure test. If there is no pipe support and the pressure test is stopped, the stainless steel metal shrink joint will extend infinitely to its own limit with the pressure and impact force. At this time, the corrugated compensator was once stretched into a straight cylinder or lost its expansion performance. 2、 Why is the damage level closely related to the fixed pipe support? First of all, it has been clarified that if the fixed pipe support is set strictly according to the request when setting the device, then the stainless steel bellows can only be pulled off and changed or shifted at most when the pull rod is removed, even if it is affected by the pipeline pressure and thrust, It will not damage the equipment and pipelines of other pipe sections. 3、 How to avoid pulling out of stainless steel bellows, and how to set the fixed pipe rack? The best way of installation is to fix the limit bolt within the scope of expansion compensation for the corrugated compensator installed with a pull rod. Another point must be noted. When fixing the pipe support and bracket, it must ensure that the pipeline will not be displaced while suffering instant pressure and pushing force, so that the bellows contraction joint can play its maximum role.
What kind of data is used for plastic coated pneumatic butterfly valve? As for the plastic coated pneumatic butterfly valve, the whole pipeline is designed with a lot of good data. The whole pipeline has a good strength and consolidation, which can better enable friends to obtain more practical assistance when using it, and can well block all kinds of strong external pressures and impacts, Therefore, it is an indispensable equipment in many industries to choose this safety management. This plastic coated pneumatic butterfly valve adopts the design of foreign technology, so the application quality can be better guaranteed when it is used. Moreover, this pipe can have many advantages, which helps to avoid more problems in the application process. Moreover, the entire safety protection pipe has many different sizes and specifications, So people can get more practical assistance from it. And the whole casing can use a lot of good metal to stop winding, to better improve the application effect.
On the structural principle and installation of pneumatic butterfly valve. Pneumatic butterfly valve is mainly composed of bellows, mesh sleeve and joint. Its inner pipe is a thin-walled stainless steel corrugated pipe with spiral or annular waveform, and the outer mesh sleeve of the corrugated pipe is woven by stainless steel wire or steel strip according to certain parameters. The joints or flanges at both ends of the hose are matched with the joints or flanges of the customer's pipes. The mesh sleeve is the main pressure bearing part of the hose device in the pressure pipeline, and also acts as a sheath for the bellows. According to the pressure in the pipeline and the application site, one or more layers of stainless steel wires or steel strips can be selected to stop weaving. The pressure range of the hose is generally PN0.6-32.0Mpa. Up to 42.0MPa. Since the main parts of the hose are made of austenitic stainless steel, the excellent temperature resistance and corrosion resistance of the hose are guaranteed. The operating temperature range of the hose is extremely wide, ranging from - 196 to 600 degrees. The applicable stainless steel brand number of the applied hose is selected according to the corrosivity of the medium through the pipe, which can ensure the corrosion resistance of the hose. Scope of application of flexible hoses: flexible walk pipes are required to avoid vibration, and are applicable to steam, gas, air, heavy oil, petroleum, chemicals, etc. Structural characteristics of pneumatic butterfly valve: pneumatic butterfly valve is generally composed of bellows, mesh sleeve and joint. Bellows are the body of pneumatic butterfly valve, playing a flexible role; The net sleeve plays the role of strengthening and shielding; The connector plays the role of connection. For different application requirements, they are connected in different ways: bellows, mesh sleeve and joint are connected by welding, which is called welding type; The connection by mechanical clamping is called mechanical clamping; In addition, the combination of the above two methods is called hybrid.