Electrochemistry corrodes metals in different forms. It does not only function between two kinds of metals, but also can cause potential difference due to differential solubility of solution, differential solubility of oxygen and the tiny difference in internals of metals, enhancing corrosion. Some...
Before using sliver brazing to install valve, analyze the application to determine which valve is the most suitable for installation and keep in mind the service for which the valve is recommended. Before installing the correct valve, review the installation instructions to prevent damage to the valve...
When use pipeline to transmit liquid or gas, the cost is only 1/3 of railway transportation and 2/3 of marine transportation. So, pipeline has already been highly developed for 100 years. The valves used for pipeline are called as pipeline valves, including ball valve, gate valve, check valve and plug...
The followings are the reasons causing defects on castings of valve. 1. Pore Pores are formed by gas which cannot escape and remained in metal. The internal wall of pore is smooth and contains gas, which has higher reflectivity. Pores show spherality or ellipsoid basically (spot defect), having...
When valves used for sulfuric acid, hydrochloric acid, nitric acid, acetic acid, alkali (sodium hydroxide), ammonia (aqua ammonia), chlorine (liquid chlorine) and brine (seawater), alcohols, ketones, esters, ethers and other corrosive media, corrosion resistance is the most critical. If metal materials...
Following are the design, manufacture and inspection standards of our company. Check Valve: API 6D 24th Specification for Pipeline and Piping valves BS 1868-1975(R1990) Specification for Check Valves (Flanged and Butt-welding Ends) for the Petroleum, Petrochemical and Allied Industries...
To build integrity management, fair and competitive market environment, strengthen the construction of quality and integrity system, ensure the valve product quality, safeguard the legitimate rights and interests of consumers, promote the building of the "Quality Wenzhou" and "Credit...
More and more factories adopt automation control. Manual operation is taken place of by mechanical or automated equipment. The actuator is required for not only playing as interface interaction for controlling mechanical motion of system and valve, but also enhancing security performance and environmental...
Low temperature devices are constantly developed in China. The demands for low temperature valves are also gradually growing. To meet the demands of market economy developing, the structure of metal seal butterfly valve is improved. A three eccentric pure metal seal butterfly valve having high performances...
Statistics show that leakage exists in about 20% of valves in industrial equipment. Caused direct economic loss accounts for about 50% of total losses. Meanwhile, valve leakage also causes pollution to environment. Use thermal infrared imager to detect valve leakage in case of industrial accident. Valve...
Function of extraction check valve is quite singular. However, extraction check valve is indispensable for turbine. Closing extraction check valve: when extraction check valve receives closing signal, air compressing three-way magnetic valve is opened. Compressed air connects with upper chamber...