1. Problems existing in traditional processing:

1.1 The valve neck requires Ra up to 0.2, which requires high turning and polishing processing and is difficult to achieve or has low processing efficiency;

1.2 Traditional polishing methods such as grinding wheel polishing, fluid polishing and electrolytic polishing are generally adopted, which have low processing efficiency and have certain impact on the environment.

1.3 Traditional processing belongs to molding manufacturing, which only ensures the size and shape accuracy of the valve, but has no effect on the improvement of the overall performance of materials such as fatigue life and strength of the valve.

2. Failure form of valve:

2.1 Valve fracture often occurs at the welding position of neck and head, and the concentration of welding stress is the main reason for valve fracture here.

2.2 Valve wear, valve rod movement in the valve duct friction, poor lubrication conditions, coupled with the dust and abrasive and carbon bonding, so that both are worn;

2.3 Valve carbon deposit;

2.4 Poor corrosion resistance of valves in special environments, such as valves on ships;

3, processing valve scheme:

Dadong valve technology focuses on improving the surface quality of parts and extending the fatigue life of the workpiece. In addition to the significant appearance effect of mirror processing, it can also strengthen the processing of the workpiece. Directly installed on the lathe, the valve rod, neck and other key parts of processing, instead of polishing.

4, Dadong valve processing valve advantages:

1. After lathe processing, direct use of Hawker processing, instead of polishing, Ra up to 0.2, to meet the processing requirements, greatly improve the valve surface quality, reduce valve carbon;

2, can achieve grain refinement of processing parts, improve fatigue strength more than 100 times;

3, improve the wear resistance of the valve by 50%, increase the microhardness by 20%, reduce the wear of the rod and the conduit;

4, conducive to eliminate surfacing stress, reduce stress concentration, prolong the service life of the weld to prevent fracture;

5, improve the corrosion resistance of the valve, to cope with the use of special environment;

6, instead of polishing and even rolling and other traditional processes, once clamping forming, reduce process turnover, greatly improve the processing efficiency;