How to win? Three basic skills of Quanwei customized brand

The electronic product panel control chip is designed by Hua Hong NEC0.35μmCZ6H 1P3AL process, and the design goal is to reduce the chip area and reduce the cost under the premise of satisfying the fu

Analysis of main technical performance of brass valve in valve industry

Today, Xiaobian will analyze the main technical performance of brass valve from seven aspects: light performance, sealing performance, flow medium, opening and closing force and moment, opening and closing speed, action sensitivity and reliability, and service life. I hope it will help you to know the products of brass valve manufacturers.

Classification and characteristics of pneumatic ball valve

[student question] classification and characteristics of pneumatic ball valve? [answer] pneumatic ball valve can be divided into o-ball valve and v-ball valve. The o-ball valve adopts floating structure, the ball core is precision casting, the outer surface is plated with hard chromium, the valve seat is made of reinforced polytetrafluoroethylene, the port of flow is the same as the pipe diameter, the flow capacity is great, the flow resistance is very small, and there is no leakage when it is closed, it is generally used as on-off valve, especially suitable for high viscosity, v-ball valve adopts fixed structure, the ball core has V-notch, which can realize shearing. Fiber, granular media. According to different process equipment, pneumatic or electric actuator can be selected to form pneumatic ball valve and electric ball valve respectively. If the pneumatic ball valve is to achieve proportional adjustment, it must be equipped with valve positioner. If the electric ball valve is to achieve proportional adjustment, it must be equipped with electronic electric actuator or servo amplifier. From the material, it can be divided into: carbon steel ball valve, stainless steel 304 ball valve, 316 ball valve and copper ball valve According to the pressure, it can be divided into: high pressure ball valve and low pressure ball valve High pressure pneumatic ball valve: mainly used in oil, natural gas, hydraulic oil, construction machinery and other industries Low pressure pneumatic ball valve: mainly used in corrosive pipelines such as water! Precautions and model of knife gate valve in use: the opening and closing part of knife gate valve is ram, the movement direction of ram is perpendicular to the fluid direction, manual knife gate valve can only be fully opened and fully closed, and cannot be adjusted and throttled. The ram has two sealing surfaces. The two sealing surfaces of the most commonly used mode gate valve form wedge and wedge angle, which vary with the valve parameters, usually 50. The wedge-shaped knife gate valve RAM can be made into a whole, which is called rigid ram. It can also be made into a ram that can produce slight deformation, so as to improve its processability and make up for the deviation of the sealing surface angle in the processing process. This kind of gate When the plate is called elastic ram knife gate valve closed, the sealing surface can only be sealed by the medium pressure, that is to say, the sealing surface of the ram is pressed to the valve seat on the other side by the medium pressure to ensure the sealing of the sealing surface, which is self sealing. Most knife gate valves adopt forced sealing, that is, when the valve is closed, the gate shall be forced against the valve seat by external force to ensure the sealing of the sealing surface. This type of valve shall be installed horizontally in the pipeline generally. The above contents are sorted out according to the problems encountered in the actual work of the trainees for reference. If there are any problems, please communicate and correct them in time.

Development prospect of brass valve

In the early 1980s, Ningbo, Zhejiang Province took the lead in developing manufacturing technology, which changed the history of long-term use of cast iron valves in China. In the manufacturing process, the sand casting forming process was initially adopted, and the forging process was changed in the early 1990s. At the beginning of the 21st century, China has become the world's copper valve manufacturing center. No matter from the process, product design, or mold production, valve casting, forging. (1) sand casting: the earliest production mode in the valve field, because the valve produced by this process is easy to produce sand holes and lead to a series of problems caused by product leakage due to insufficient pressure of the casting type. (2) hot forging: the valve body formed by forging will not have sand holes and its appearance will be more exquisite. Sand blasting, metalworking, parts assembly, product pressure test, packaging and sealing Selection principle According to the control function selection, all kinds of valves have their own functions, which should be paid attention to. According to the selection of working conditions, the technical parameters of common valves include nominal pressure, maximum allowable working pressure, working temperature (minimum and maximum temperature) and medium (corrosiveness and flammability). During selection, the above parameters of working conditions shall be consistent with the technical parameters of valves. According to the installation structure. The installation structure of the pipeline system includes pipe thread, flange, ferrule, welding, hose, etc. Therefore, the installation structure of the valve must be consistent with the installation structure of the pipeline, and the specification and size must be consistent. brass valve Installation mode The valve connected by pipe thread is connected with the pipe thread at the pipe end, wherein the internal thread can be cylindrical pipe thread or conical pipe thread, while the external thread must be conical pipe thread. The gate valve connected with the internal thread is connected with the pipe end, and the length and size of the external thread of the pipe end need to be controlled. In order to avoid excessive screw in of pipe end, the inner end face of the pipe thread of the top pressure gate valve will cause the valve seat deformation and affect the tightness. When the valve connected with pipe thread is installed and tightened, the hexagonal or octagonal part at the same end of the thread and the hexagonal or octagonal part at the other end of the valve shall not be spanned to avoid deformation of the valve. The flange of the flange connected valve and the flange of the pipe end shall not only be consistent with the specification and size, but also with the nominal pressure. In case of leakage of the valve stem during the installation and commissioning of the stop valve and gate valve, tighten the compression nut at the packing, and pay attention that the force shall not be too large to the extent of no leakage. Since the beginning of the 21st century, some well-known domestic copper valve manufacturers have broken the conventional thinking and have the courage to innovate and practice, and have developed a large number of new products, which has greatly improved the scope of application of brass valves in the field of engineering applications. In particular, the successful experimental development of all copper hydraulic control series not only makes a qualitative leap in the manufacturing process of copper valve products, but also greatly promotes the overall competitiveness of the copper valve industry.