网络优化资料：
The quality and technical level of valve products is directly related to the development of industries such as petroleum, chemical, electric power, nuclear power, oil and gas transportation, and marine engineering. Starting from the needs of downstream users, focus on the research and development of core technologies, strengthen management, change the current status of low-level competition in the industry, and promote valve products to develop in the direction of high technology content, high parameters, high corrosion resistance, and long life. The overall competitiveness of the industry.
The problem of internal valve leakage seriously threatens the normal operation of the device, and it is difficult to find whether there is internal leakage in the air solenoid valve during operation. The survey results show that various valves used by petrochemical companies have internal leakage problems to varying degrees. The reason for this phenomenon is that the sealing surface material of the valve plate and the valve seat does not meet the requirements of use, the processing accuracy is insufficient, the wedge angle of the valve plate of the gate valve does not match the valve seat, the width of the sealing surface is inconsistent, the fit is poor, and the gate does not match. In place, the closure is not strict.
The sealing surface material refers to the relatively soft sealing surface material in the sealing pair. The other sealing surface material corresponding to it should obviously also be a cemented carbide material. In fact, some valves are only stacked on one of the sealing surfaces. Welded hard alloy, and the other sealing surface of the DC solenoid valve is the body material of carbon steel, which causes internal leakage due to wear and tear shortly after being put into use.
The reasons for this situation are as follows:
The structural design of the valve sealing pair is unreasonable or the manufacturing and assembly accuracy cannot meet the requirements;
The second is that the valve installation is not constructed according to the regulations, so that the valve is subjected to excessive pressure;
During the construction process, some impurities such as welding slag, sand particles, metal shavings, etc. entered the valve cavity, thereby affecting the sealing effect. In fact, it is more practical and the most fundamental reason is that it did not follow the standard requirements in a certain process of production, transportation or installation.
