Spherome valve rod of hydraulic valve and manufacturing method thereof

Abstract

The invention relates to a part of a hydraulic valve, in particular to a sphere valve handle or a valve core of a hydraulic valve. A certain accuracy circular sphere is welded at one end at which the valve handle or the valve core is connected with a valve seat, and the spherical center of the circular sphere is arranged on an extension line of a central axial line of the valve handle or the valve core. The diameter of the circular sphere is larger than or equal to the diameter of a valve hole of the valve seat. The manufacturing method is that: firstly, a concave spherical surface, a concave conical surface or a center hole which correspond to the diameter of the circular sphere are processed or not processed on the end surface of one end of the valve handle or the valve core, and the concave spherical surface, the concave conical surface or the center hole have the same central axis with the valve handle or the valve core; the circular sphere is arranged on a orifice of the concave spherical surface, the concave conical surface or the center hole, and a special clamp is used to keep the circular sphere and the valve handle or the valve core to be at the same central axis at a certain pressure; the resistance welding, the inert gas shielded arc welding, the brazing or the friction welding are used to weld the circular sphere on the valve handle or the valve core. The technical problem that the spherical surface of the circular sphere replaces a cone sealing structure of the valve handle or the valve core is solved.

Description

Technical field: [0001] The present invention relates to components of hydraulic valves, in particular to ball valve stems of hydraulic valves and a manufacturing method thereof. Background technique: [0002] As a control element in a hydraulic system, hydraulic valves are widely used in various construction machinery, machine tools, forging equipment, agricultural machinery, aircraft, ships, and aerospace devices. With the difference of its control function in the hydraulic system, the structure of the hydraulic valve is also different, but the cone sealing structure A of the valve (see Figure 1 and Figure 2) is the same, because the cone A1 and the The annular cutting edge A2 on the valve seat 1 contacted by the cone A1 is formed, and the number of the cone sealing structures A is different for hydraulic valves of different structures. For example, the one-way valve shown in Figure 1 has only one cone sealing structure A, The reversing valve shown in Fig. 2 has two cone ...

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Problems solved by technology

The advantage of this cone sealing structure is that it can withstand higher pressure, but its disadvantage is that in order to meet the high sealing requirements, the machining accuracy of the cone must be improved, especially the more the number of cone sealing structures A, the more difficult it is to process , so its processing cost is high

At the same time, since the cone A1 is set on the sliding valve stem or the valve core 2, it is a part of the valve stem or the valve core 2. Therefore, when using high-quality steel such as high carbon steel, hard When alloy steel is used, the cost of materials is increased

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