Vacuum system exhaust valve inspection

Pump valve damage is one of the common faults. In case there is a continuous emergence of bubbles in the oil window, and even a large number of oil churning, vacuum is very low or vacuum meter pointer swing back and forth (commonly known as gas back), mostly belonging to the valve fault. ZB-65 Vintage five pump, the exhaust valve is double cylinder, cylinder for a long time. It is not unusual to run away through the stalls marble cover plate or screw loosening, so should regularly check the structure of the valve cover is the pits if the pits cover should be replaced.

Steel type valve breakage, screw looseness or uneven pressure, oil and rubber Masonite type valve easy to damage, large pump valve spring pressing plate is easy to break, in case of the fault, only need to replace the valve, and other parts can be. Of course, some of the problems of the valve is not easy to make a fox, for example: there is a slide valve vacuum high and low, such as the situation is more difficult to check, because the performance is not obvious, sometimes occasional. According to the experience of judgment, pump cavity deformation, local micro leakage, oil seal film accidental destruction, valve plate defects are likely to make the vacuum swing. Therefore, the lower end of the first cover, check the taper of the pump cavity, with the end of tolerance, eccentric wheel parallelism and so on, the results, the problem is not large, within the allowable range. After the assembly of the vacuum pump is still swinging, and suspected seal leak, then use the shellac solution brushing several times, to be dry after chouce, you still do not listen to the voice that the pump, valve beating sound not too crisp is also slightly uneven, sometimes, can see a few bubbles coming out but check valve tablets are not bad. And then carefully observed and found that the valve plate off the gas outlet. After examination, found that the valve according to the angle of the installation is not right, that is not parallel with the outlet.

Then take the valve plate into a certain angle, and the spring pressing valve, so, to test the vacuum, hands no longer swing, running through that is repaired. This is a bit of special instructions for making on the fault in use for a long time, will also be reflected. Attention should be paid to this part of the exhaust valve, it is often necessary to carefully check the work of it because it will often appear a variety of problems. The exhaust valve with the valve in the valve is easily broken, there is no impact is not installed fragmentation, rod loosening, nut loosening, spring fracture, marble run, should carefully check.

In the operation, should be careful not to suddenly open the pump because the pump cavity filled with oil, the pump will suddenly broken rotor (especially high vacuum level, rotor) light break valve rotary Wei especially in pumping gas containing many containers, we must pay attention to the pump or gradually start belt the number of rings before the pump wheel disc by hand.