Performance test of pneumatic butterfly valve?
The quality of the pneumatic butterfly valve will affect the stability of the vehicle and the service life of other parts. Therefore, the automobile pneumatic butterfly valve needs to be in a good working condition for a long time. What kind of pneumatic butterfly valve is good! We checked it together!
Stop the car after driving 10km on the road with poor road conditions, touch the shell of the pneumatic butterfly valve with your hand. If it is not hot enough, it means that there is no resistance inside the pneumatic butterfly valve, and the pneumatic butterfly valve does not work. At this time, you can participate in the appropriate lubricating oil, and then stop the test. If the shell is hot, it means that there is a lack of oil inside the pneumatic butterfly valve, and you should add enough oil; Otherwise, the pneumatic butterfly valve is invalid. Press the bumper firmly and then release it. If the car jumps 2-3 times, the pneumatic butterfly valve works well. Dismantle the pneumatic butterfly valve to make it stand upright, clamp the lower connecting ring on the bench clamp, and pull and press the shock absorber rod several times with force. At this time, there should be stable resistance. The resistance of pulling upward should be greater than the resistance of pressing downward. If the resistance is unstable or there is no resistance, it may be the lack of oil inside the pneumatic butterfly valve or the valve parts are damaged, and the repair or replacement of parts should be stopped. These three points are often used in the process of inspection!
Don't ignore the inspection of your car's pneumatic butterfly valve, which will bring you hidden trouble, so take action when you see it! Don't hesitate! If you need to reprint this article, please indicate the source!

Fixed support thrust calculation:
The degree thrust of the main fixed support is composed of the combined force of three forces:
(1) Internal pressure thrust caused by working pressure F ＝ P * A:
Where P is the working pressure and A is the effective sectional area of the bellows. The internal pressure thrust is determined by the effective sectional area and working pressure of the bellows. The internal pressure thrust is proportional to the working pressure and effective sectional area. Generally speaking, the internal pressure thrust of the bellows compensator is large.
(2) Elastic force generated by bellows rigidity PA ＝ K * f * L
Wherein, K refers to the rigidity of bellows, L refers to the practical elongation of pipeline, f refers to the coefficient, which is 0.5 when pretensioning, otherwise, it is 1.
(3) Sliding friction reaction force q between fixed supports μ l
Where q is the weight of the pipe, μ Is the friction coefficient, and l is the spacing between the free end and the fixed end of the pipe.
Degree thrust of main fixed support=internal pressure thrust+friction reaction+elastic force
If it is not concentric, the bending moment and lateral thrust of the fixed support due to eccentricity will also be included. The main fixed support has a great thrust, and the large pipe diameter can reach hundreds of tons. The civil engineering layout is difficult, and comprehensive structural accounting needs to be stopped. It is a heavy load support.
The secondary fixed support bears the same force as the main fixed support, but the internal pressure thrust is balanced and offset, and the total thrust is small. It is not of the same order of magnitude as the main fixed support, but belongs to the intermediate load shedding support.
When calculating the fixed point thrust, the force on each side of the fixed point shall be calculated separately and then combined. When both sides of the fixed point have the same direction, the vector sum of the two forces is used as the fixed point thrust. When the two forces are in opposite directions, use the force with large absolute value minus 0.7 times of the force with small absolute value as the thrust of the fixed point.
The guide support is used to control the movement along the pipeline or the movement direction of the compensator, so as to ensure that the contraction of the pipe section acts on the compensator and that the pipeline will not be unstable
The manufacturer's samples of ordinary compensators not only elaborate on the product specifications, structures and parameters, but also have application examples for thrust calculation and general device requirements, which are more generous and can be used as design basis