After long-term use of the valve, the valve flap and seat sealing surface will be worn, the tightness is reduced. Repairing the sealing surface is a large and very important task. The main method of repair is grinding. The sealing surface of serious wear is first welded by turning to process and then grinding.

Grinding of valves includes:

Cleaning and inspection process.

Grinding process.

Inspection process.

The line should be erased 

Fine grinding is the last process of a valve grinding machine, mainly to improve the finish of the sealing surface. Fine grinding can be used W5 or finer micro-part with machine oil, kerosene, etc. after dilution, with the valve head against the valve seat for grinding, without acting drama, which is more conducive to the sealing surface of the close.

Grinding generally clockwise turn about 60-100 °, and then the opposite direction turn about 40-90 °, gently grinding for a while, just check once, to be ground to shine, and in the valve head and valve seat can be seen on a very thin line, the color reaches the black bright, and then gently grinding a few times with machine oil, wipe clean with clean gauze can be.

After grinding, and then eliminating other defects, that is, should be assembled as soon as possible, so as not to destroy a good grinding of the valve head.

Manual grinding regardless of coarse or fine grinding, is always throughout the lifting, put down; rotation, reciprocation; light knock, change direction and other operations combined with the grinding process. The purpose is to avoid repetition of abrasive trajectory so that the grinding tool and sealing surface get uniform grinding, improving the flatness and smoothness of the sealing surface.

Inspection stage

The inspection phase is always carried out during the grinding process, the purpose of which is to keep track of the grinding situation and to make sure that the grinding quality meets the technical requirements. It should be noted that different valves should be ground using grinding tools adapted to the form of various sealing surfaces to improve grinding efficiency and ensure the quality of grinding.  

Because the abrasive is a mixture of abrasive and abrasive fluid, and the abrasive fluid is only the general kerosene and oil. Therefore, the most critical part of the correct choice of abrasive is the correct choice of abrasive.

Valve grinding is very detailed work, need to experience, feel, improve in practice, sometimes grinding is very good, but after installation or leakage of steam and water, this is because in the grinding process there is a grinding of the imagination, the hand-held grinding rod is not vertical, skewed, or the size of the grinding tool angle deviation.

We are a valve grinding machines supplier, please feel free to contact us if you need them.