Shandong 30 loader multiple valve stem card what's wrong.
1. cards, the most likely cleanliness problem, accounting for 80% of the probability. Because the sale of multi-channel valve to go through more than two experiments, if it is cylindrical problem, should be found before leaving the factory.
2., if the cylinder problem, the stem or valve hole will appear on a continuous block where there are grinding marks, the stem groove is a lot of fine iron powder, this situation can be responded to manufacturers, request a good change.In fact, many problems are cleanliness problems, and if you know how to wash, that is not a waste of time, simple and effective.
You take the two main stem carefully removed, check the stem and valve bore cavity whether there is scratch, if there is a local scratch, it may be dirty stuck in it, and then pull the stem when it pulled. Scratches if deep, leakage will be large, repair will feel bucket slow, little force and so on. All components should be removed before washing, especially the safety valve. After the demolition, the whole body with kerosene cleaning, safety valve pressure should not be adjusted, or there is no test stand, you do not know the specific pressure is how big.
