Vacuum system exhaust valve inspection

  Damage to the valve plate of the pump is also one of the common faults. In the case of oil bubbles continuously appearing in the oil window, even a large amount of oil tumbling, the vacuum is very low or the gauge pointer swings back and forth (commonly known as returning gas), which is mostly a valve problem.Vacuum Valves

     The steel plate valve piece is easy to be broken, the pressing screw is easy to loose or unevenly pressed, the oil rubber stripping cloth is easy to be deformed and damaged, and the spring of the large pump pressing the valve piece is easy to be broken. In case of these failures, only need to be replaced. Valves, marbles and other parts can be used. Of course, there are some problems with the valve. It is not easy to have a fox. For example, there is a valve that has a vacuum that is too high or low. It is difficult to check the situation like this, because the performance is not obvious, sometimes it is inter-sexual. According to experience, the pump cavity is deformed, the local micro-leakage, the oil seal film accidentally broken, and the valve sheet can cause the vacuum degree to swing. Therefore, the end cap is first removed, the roundness taper of the pump chamber, the tolerance of the end face, the parallelism of the eccentric wheel, etc., and the result is not large, within the allowable range. After the assembly, the vacuum still oscillates, and it is suspected that the pump body is leaking, so it is painted several times with the shellac paint solution. After the test, it is still not pumped, and you still notice that the valve beat is not too crisp. Slightly uneven, sometimes, it can be seen that several bubbles came out but the valve was not broken. After careful observation, it was found that the valve plate was closed to the air outlet. Upon inspection, it was found that the angle of the valve plate was not correct after installation, that is, it was not parallel with the air outlet.

     At this time, the valve plate pressure plate is fixed at a certain angle, and the valve plate is pressed by a spring, so that the vacuum degree is tested again, the needle is no longer oscillated, and the operation proves that it is indeed repaired. This example is a bit special, indicating that the manufacturing problems will be reflected after a long time of use. Pay attention to this part of the exhaust valve, and always check its working condition frequently because it often has various problems. In addition to the valve plate is easy to break, the valve plate is not tightly loaded, not broken, the rod is loose, the compression nut is loose, the compression spring is broken, the marble is running away, etc., should be carefully checked.Vacuum System

     In operation, care should be taken not to open the pump. Because the pump chamber is full of oil, the pump will break the rotor (especially the high vacuum stage rotor), and the valve will be broken, especially in the air volume. When using many containers, be sure to start the pump step by step or turn the pulley several times with the hand to turn the pump on.Molecular Vacuum Pump Price