 |
|
Product sales
Valve Repair
|
|
|
| Valve seat grinding technology and method application |
| Article source：江阴市欧雷斯 Update Time：2025-1-30 |
 |
Valve seat grinding, which is the restoration grinding of the valve body''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s sealing surface, may seem like a operation of friction between abrasive materials and the sealing surface. However, it actually contains extraordinary scientific principles. To better complete the valve seat grinding restoration work, it is not to use manual grinding. Manual grinding requires skilled technicians to achieve, and ordinary personnel find it difficult to master. Therefore, ordinary personnel should use special valve seat grinding, such as the DYMZ3 type valve grinding machine. Through the four processes of rough grinding, medium grinding, fine grinding, and precision grinding, the rough seat sealing surface can be made smooth and flat, restoring its good sealing performance. From a microscopic perspective, valve seat grinding is a process that combines mechanical cutting and chemical. When the grinding head of the grinding machine is closely attached to the valve seat surface and moves in a complex relative motion under a certain pressure, the grinding sandpaper begin to play a role. These abrasive particles are like tiny cutting tools, which, under the drive of the grinding tool, perform micro-cutting on the valve seat, removing tiny protrusions, scratches, and wear layers on the surface, gradually reducing the roughness of the valve seat surface and making it smoother. During the grinding of the valve sealing surface, if valve-specific grinding paste is used, the chemical action should not be overlooked. Some components in the grinding agent, such as grease, undergo a chemical reaction with the metal on the valve seat surface, forming a thin layer of oxide film on the surface. This layer of oxide film is relatively soft and to be cut and removed by abrasive particles, thus accelerating the grinding process and improving the grinding efficiency. This synergistic effect of mechanical and chemical actions allows valve seat grinding achieve high-precision surface processing, enabling the valve seat to meet the ideal sealing performance requirements. The various parameters of the DYMZ3 type valve grinding machine during valve seat grinding process, such as grinding speed, grinding pressure, and grinding allowance, have a crucial impact on the grinding quality and efficiency. The grinding speed is directly to the number of times the abrasive particles cut the valve seat surface per unit time. Generally speaking, the faster the grinding speed, the more abrasive particles pass through the seat surface per unit time, and the more metal is removed, resulting in a higher grinding efficiency. However, the grinding speed is not the faster the better. When speed is too high, a large amount of heat is generated, causing the temperature of the valve seat and the grinding tool to rise. Excessive temperature may cause thermal deformation of the valve seat material, affecting its geometric shape accuracy, and may even lead to burning of the grinding surface, reducing surface quality. The appropriate grinding speed for seats of different materials also varies. For example, the grinding speed of copper and cast iron sealing surfaces is usually 15 - 50m/min; for steel and hard alloy sealing surfaces, it is 20 - 90m/min; for austenitic stainless steel sealing surfaces, it is 15 -30m/min.
|
|
|
 |
