1. Cleaning and inspection process

Cleaning the sealing surface in the oil pan, using professional cleaning agents, while washing and checking the sealing surface damage. With the naked eye is difficult to determine the fine cracks available coloring flaw detection method.

After cleaning, the valve flap or gate valve and the valve seat sealing surface should be checked for tightness, check with red and pencil. With red Dan test red, check the sealing surface imprinting, to determine the sealing surface of the sealing surface; or with a pencil in the valve flap and seat sealing surface of a few concentric circles, and then the valve flap and the seat of the sealing rotate, check the pencil circle erased, to determine the sealing surface of the sealing surface of the sealing surface.

If the fit is not good, the standard plate can be used to test the valve or gate sealing surface and the valve body sealing surface, to determine the grinding parts.

2. Grinding process

Grinding process is essentially a cutting process without lathe, valve head or valve seat on the depth of the pitting or small holes are generally within 0.5mm, you can use the grinding method for overhaul. The grinding process is divided into coarse grinding, medium grinding and fine grinding.

Rough grinding is to eliminate the abrasion, indentation, etching and other defects on the sealing surface, so that the sealing surface to get a high degree of flatness and a certain degree of finish, for the sealing surface of the middle grinding to lay the foundation.

3. Inspection stage

In the grinding process has always been through the inspection stage, its purpose is to grasp the grinding situation at any time, to do a good job, so that the grinding quality to meet the technical requirements. It should be noted that different valve grinding should be used to adapt to a variety of sealing surface form of grinding tools to improve grinding efficiency, to ensure grinding quality.

Valve grinding is a very detailed work, need to experience in practice, feel, improve, sometimes grinding is very good, but after mounting or leakage of steam leakage, this is because in the grinding process there is grinding bias imagination, the hand holding the grinding rod is not perpendicular, skewed, or the angle of the size of the research tool is caused by deviation.

4. Selection of grinding tools

Valve and valve seat sealing surface due to the degree of damage is different, can not be directly on the research, but first with a certain number of pre-specialized and specifications of the false valve (i.e., grinding head), false valve seat (i.e., grinding seat), respectively, on the seat, the valve valve for grinding.

Grinding head and grinding seat made of ordinary carbon steel or cast iron, size and angle should be placed on the valve with the valve, valve seat equal.

Grinding if manual, need to configure a variety of grinding rod. Grinding rod and grinding tool should be properly assembled, not skewed. In order to reduce human labor intensity, accelerate the speed of grinding, often using electric grinder or vibration grinder grinding.