Butterfly valve structure diagram What is the butterfly valve structure diagram like? Obviously, the structures of different types of butterfly valves are different. Here are the different butterfly valve structure diagrams

Analysis on stability and quality control of bellows rotary compensator
Bellows compensator is one of the key components of modern heating pipe network and equipment to stop thermal compensation (axial, transverse and angular displacement). The thermal compensation performance of the compensator is determined by the bellows. Under the action of axial force, transverse force and bending moment, bellows is allowed to produce large changes. As a thin-walled flexible element, its wave crest and wave trough basically work within the plastic range. Therefore, in addition to the requirements of sufficient rigidity, strength, stability and fatigue life, bellows also needs to have greater flexibility. Its stress distribution is much more complicated than that of containers.
During the normal operation of the bellows compensator, the gravity of the pipe system is required to be borne by various supports and hangers, so that the pipe system can freely shrink (contract); Tongjing often uses the pre deformation of the pipeline to reduce the thrust of the pipe support and strengthen its stability, which are particularly important in the process of installation, new construction and reconstruction.
During the normal operation of the bellows compensator, the gravity of the pipe system is required to be borne by various pipe supports (hangers). The mass of the corresponding flue for this installation is 20t, which is borne by a constant force spring. In the process of transformation, the rigid fixation of the pipeline system was stopped, but the reset of the constant force spring was not stopped; Due to the particularity of the displacement of the constant force spring, when the external load is removed, it cannot return to the original state. Therefore, after re installation, the constant force spring is in a state of no force in practice. 1 Design control of ripple compensator
Design control includes design input, design output, design review, design change and other links. The design should meet the requirements of Ping An technical standards. At present, the manufacturing units of the rotary compensator all implement GB ／ T12777 and the EJMA specification of the United States. The product samples are based on the mold size, design pressure, design temperature, layers, wall thickness, wave root diameter, wave distance, wave height, wave number, etc. to calculate the ripple performance, such as stiffness, stress calculation, strength verification, and compensation calculation under a given fatigue life. Bellows shall be designed according to Appendix A of GB ／ T12777, but the design of structural parts (vertical plate, end ring, end plate, hinge plate, universal ring) shall not be ignored. The design shall be stopped according to Appendix B of GB ／ T12777.
2. Manufacturing control of corrugated compensator
According to the forming process, it can be divided into hydraulic forming, rolling forming, mechanical bulging, stamping and welding forming and stacking forming. Hydroforming is the most commonly used forming method for corrugated compensator. The rotary compensator is applied to the liquid pressure in the tube blank to make the tube blank bulge in the limiting ring until it is bent along the ring, and then shrink the tube blank to the required length. This method is often used for small diameter corrugated pipes. The rolling forming process is mainly used to process large bellows, which is formed by rolling the forming wheel in the tube blank, and can be formed by single wave rolling. Some installations can also be formed into several waves at a time. The manufacturer shall select the bellows mold according to the design parameters of the product sample, and consider the springback after plastic deformation to ensure the geometric dimension of the waveform of the bellows compensator
3 Inspection of control ripple compensator
The ex factory inspection shall be stopped one by one when the corrugated compensator products are delivered. The purpose of the inspection is to ensure the manufacturing quality. The ex factory inspection items include appearance inspection, dimensional inspection, nondestructive testing of welded joints, pressure test, kerosene leakage test, and air tightness test.