Where water is needed in our life, we will definitely use one thing, and that is the valve. Water is uncontrollable, but the valve provides great convenience for us to control the water flow. We can open the valve when we need water and close it when we don't need it. For a long time, China has been using cast iron valves, but because of the lack of materials and technology, it has a certain impact on water quality. In the 198s, Zhejiang changed its manufacturing technology, and copper valves appeared for the first time.
process flow
1. Product design
2. Mould making
3. Valve casting and forging
(1) foundry: the earliest production mode in the field of valves, because there is not enough pressure in casting, valves produced by this process are prone to sand holes, which leads to product leakage and induces a series of problems.
(2) hot forging: the valve body formed by forging will not have sand holes, and its appearance will be more exquisite.
1.? Sand blasting treatment
2. Metalworking
3. Accessories assembly
4. Product pressure test
5. Packaging and sealing
product classification
1. Copper gate valve: Gate valve refers to the valve whose closing part (gate) moves along the vertical direction of the channel axis. It is mainly used as a cutting medium in the pipeline, that is, it is fully open or fully closed.
2.? Copper ball valve: It evolved from the plug valve, and its opening and closing part is a sphere, which can be opened and closed by rotating 9 degrees around the axis of the valve stem.
3.? Copper globe valve: refers to the valve whose closing part (disc) moves along the center line of the valve seat. According to this movement form of the disc, the change of the valve seat opening is in direct proportion to the disc stroke.
4.? Copper check valve: a valve that automatically opens and closes the disc depending on the flow of the medium itself to prevent the medium from flowing back.
Selection principle
1. According to the selection of control function, all kinds of valves have their own functions, and attention should be paid to their corresponding functions when selecting.
2.? According to the selection of working conditions, the technical parameters of commonly used valves include nominal pressure, maximum allowable working pressure, working temperature (minimum and maximum temperature) and medium (corrosiveness and flammability). When selecting, it should be noted that the above parameters of working conditions are consistent with the technical parameters of valves.
3.? According to the installation structure. The installation structure of pipeline system includes pipe thread, flange, clamping sleeve, welding, hose, etc. Therefore, the installation structure of the valve must be consistent with the installation structure of the pipeline, and the specifications and dimensions should be consistent.
installation method
1. The valve with pipe thread connection is connected with the pipe thread at the pipe end, in which the internal thread can be cylindrical pipe thread or conical pipe thread, and the external thread must be conical pipe thread.
2.? The gate valve connected with internal thread is connected with the pipe end, and the length and size of external thread at the pipe end need to be controlled. In order to avoid excessive screwing of the pipe end, the inner end face of the pipe thread of the gate valve will be pressed, which will cause the deformation of the valve seat and affect the sealing performance.
3.? When installing and tightening valves connected with pipe threads, wrench the hexagonal or octagonal parts at the same end of the thread, but not the hexagonal or octagonal parts at the other end of the valve, so as to avoid deformation of the valve.
4.? Flange connecting the flange of the valve with the flange of the pipe end is not only consistent with the specification and size, but also with the nominal pressure.
5.? When valve stem leakage is found in the installation and debugging of globe valve and gate valve, just tighten the compression nut at the packing, and pay attention to the fact that the force cannot be too large, so as not to leak.
At present, copper valves have developed rapidly and have a wide variety, which can be applied to most valve occasions. Compared with cast iron valves, the quality of copper valves has been substantially improved, and it will not rust or fall off internally, which has a good effect on maintaining water quality. In the new century, a large number of manufacturers in China have broken the conventional thinking and developed a large number of innovative products, which makes copper valves occupy a large proportion in engineering and household fields, and their application scope has also been greatly improved.
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