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The opening and closing parts of the globe valve are plug-shaped discs, also known as gate valves. It is mainly used to control the flow of various types of fluids such as water, steam, air and various corrosive media, mud, oil, liquid metal and radioactive media.
When installing and using the globe valve, special attention should be paid to three points:
1. The globe valve should be checked for leakage before opening to determine whether the valve has no leakage defects and whether the stuffing box has no leakage defects.
2. If the valve stem operation of the globe valve cannot be done by hand, it can be replaced by a special F wrench. However, if the F wrench still cannot be opened, do not use the extended wrench to forcibly open and close it to avoid damage to the valve and even safety. the occurrence of the accident.
3. When the globe valve is used in the medium pressure steam pipeline, the condensed water needs to be removed before opening, and then the pipeline is preheated with steam, and the preheating pressure is kept between 0.2 and 0.3MPA. The purpose of this is to avoid the temperature . If the seal is damaged due to sudden changes in pressure, the pressure can be adjusted to the required level after it is determined that the state is stable.
The construction of the globe valve:
The structure of the globe valve is relatively complicated, but the actual operation is simple and labor-saving, and it has a good performance in regulating the flow and cutting off the channel. The globe valve has a compact structure and obvious features. The top of the valve is provided with a hand wheel and a valve stem, and a thread and a stuffing box sealing section are provided in the middle.
The main way of judging the opening and closing state of the valve when the globe valve is in use is to observe the height of the valve stem exposed from the valve cover, so as to control the operation of the valve. There may be a gap between the valve stem and the valve cover, which is prone to medium leakage, which can be solved by packing sealing. The stem thread of the small globe valve is set in the valve body, so it is often in contact with the medium for a long time in use, and is easily corroded by the medium.
Therefore, in order to prevent the short service life of the globe valve, Lianquan, the chief engineer of Xiandie Valve, believes that the installation of the globe valve should refer to the direction of the fluid, and pay attention to keeping the fluid in the pipeline low in and out, that is, flowing through the valve seat port from bottom to top. The purpose of this installation is to reduce the fluid resistance in the valve body, thereby reducing the valve opening and closing force, and at the same time, it can keep the valve stem and stuffing box from contacting the medium when the valve is closed, thereby reducing damage and leakage.
The above three-point stop valve installation and use process need to pay attention to the matters and the basic structure of the stop valve has been explained in detail to you, it will definitely help you.
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