Grinding of valves
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Release Time：2018-11-28
The grinding of the valve includes the cleaning and inspection process; 1. The cleaning process cleans the sealing surface in the oil pan, using professional cleaning agent, and checks the damage of the sealing surface while washing. With the naked eye is difficult to determine the fine crack can be used to color inspection method. After cleaning, check the tightness of the valve flap or gate valve and the sealing surface of the valve seat with red and pencil. If the seal is not good, the standard plate can be used to check the valve flap or gate sealing surface and the valve body sealing surface respectively to determine the grinding part. 2. Grinding process The grinding process is essentially a cutting process without lathe. The depth of pitting or small holes on the valve head or valve seat is generally within 0.5mm,
Valve grinding including cleaning and inspection process;
1. Cleaning process
Clean the sealing surface in the oil pan, use professional cleaning agent, wash while checking the damage of the sealing surface. With the naked eye is difficult to determine the fine crack can be used to color inspection method.
After cleaning, check the tightness of the valve flap or gate valve and the sealing surface of the valve seat with red and pencil. If the seal is not good, the standard plate can be used to check the valve flap or gate sealing surface and the valve body sealing surface respectively to determine the grinding part.
2. The grinding process
The grinding process is essentially a cutting process without lathe. The depth of pitting or small holes on the valve head or valve seat is generally within 0.5mm, which can be overhauled by grinding. The grinding process is divided into coarse grinding, medium grinding and fine grinding.
Rough grinding is to eliminate the defects such as scratches, indentations and corrosion points on the sealing surface, so that the sealing surface can get a higher flatness and a certain degree of smoothness, and lay the foundation for the grinding of the sealing surface.
After grinding, the contact plane of the valve should be bright. If you use a pencil to draw a few lines on the valve head or valve seat, turn the valve head or valve seat slightly, and erase the pencil line.
Fine grinding is the last process of valve grinding, mainly to improve the finish of the sealing surface. When grinding, generally turn about 60-100 degrees clockwise, and then turn about 40-90 degrees in the opposite direction. Gently grind for a while. You must check it once. When the grinding is bright and luminous, you can see a circle on the valve head and valve seat. Very thin lines, when the color reaches black and bright, gently grind several times with engine oil and wipe it clean with clean gauze.
After grinding, and then eliminate other defects, that should be assembled as soon as possible, so as not to damage a good grinding valve head.
Manual grinding, whether rough or fine, is always through the lifting, down; Rotation, reciprocating; Tapping, reversing and other operations combined with the grinding process. The purpose is to avoid the repetition of the abrasive trajectory, so that the grinding tool and the sealing surface are uniformly ground, and the flatness and smoothness of the sealing surface are improved.
In the grinding process always runs through the inspection stage, its purpose is to grasp the grinding situation at any time, so that the grinding quality to meet the technical requirements. It should be noted that different valve grinding should be used to adapt to various sealing surface forms of grinding tools to improve grinding efficiency and ensure grinding quality.
Valve grinding is a very meticulous work, which requires continuous experience, exploration and improvement in practice. Sometimes the grinding is very good, but it still leaks steam and water after installation. This is due to the imagination of grinding deviation in the grinding process, the grinding rod in hand is not vertical or skewed, or the size and angle of the grinding tool are deviated.
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2026/02/28
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