Valve assembly is the final stage in the fabrication process. Valve assembly is based on the delineation of the technical premise, the parts of the valve together, make it a product process. Assembly work has a great impact on the product quality, even if the design is accurate, the parts are qualified, if the assembly is improper, the valve can not meet the requirements of the provisions, and even produce seal leakage. Therefore, the appropriate assembly method should be adopted to ensure the final product quality of the valve. The assembly process defined in production is called the assembly process procedure.
Common assembly methods for valves：
There are three common assembly methods for valves, namely, complete replacement method, repair method and matching method.
1. Complete exchange method
When the valve is assembled by complete exchange method, each part of the valve can be assembled without any repair and choice, and the product after assembly can meet the specified technical requirements. At this time, the valve parts should be completely in accordance with the design requirements, to satisfy the accuracy of shape and position tolerance request. The advantages of the complete exchange method are: the assembly work is simple, economic, workers do not need a high degree of skill, the assembly process is high, easy to organize the assembly line and professional production. However, absolutely speaking, when taking the complete replacement assembly, the machining accuracy of the parts is higher. Suitable for stop valve, check valve, ball valve and other structures of absolutely simple valve and medium and small diameter valves.
2. Optional method
The valve adopts optional assembly, the whole machine can be processed according to economic accuracy, and then a size with adjustment and compensation effect, in order to reach the specified assembly accuracy. The principle of the matching method is similar to that of the repair method, but the way of changing the size of the compensation ring is different. The former is to change the size of the compensation ring, while the latter is to change the size of the compensation ring. For example: the control valve model double gate wedge valve top core and dispensing gasket, is in the size chain related to the assembly precision of the special parts as compensation, by adjusting the thickness of the gasket, to reach the required assembly accuracy. In order to ensure that the fixed compensation parts can be selected in different situations, it is necessary to manufacture a set of hydraulic control valve models of gasket and shaft sleeve compensation parts with different thickness sizes in advance for assembly.
3. Repair method
The valve is assembled by repair method, and the parts can be processed according to economic accuracy. When assembly, a size with adjustment and compensating effect is repaired to achieve the specified assembly goal. This method has certainly added to the plate process, but greatly simplifies the size accuracy requirements of the previous processing process, the board process of the special operation, generally speaking, will not affect the production effectiveness. Valve assembly process: the valve individually adopts fixed site assembly, the valve parts, component assembly and general assembly are carried out in the assembly workshop, and all the necessary parts and components are transported to the assembly working place. Usually, component assembly and total assembly are carried out by how many groups of workers at the same time, which not only shortens the assembly cycle, but also facilitates the application of special assembly tools, and the requirements for the technical level of workers are relatively low.
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Post time: May-23-2024