Floating Ball Valve Generally, the sealing form of floating-structure ball valve is exit seal. After closing the valve ball, the valve ball under the effect of medium pressure moves a little toward the valve seat, making the valve seat produce elastic deformation and exert compaction effect on valve ball, thereby ensuring the sealing of valve. Greater medium pressure equals better valve sealing performance. (Provide that: the actual seating pressure is within the scope of the tolerance pressure...

According to different structures, butterfly valve can be classified into concentric butterfly valve, single offset butterfly valve, double offset butterfly valve and triple offset butterfly valve. Structure and performance of concentric butterfly valve The concentric butterfly valve is featured by the same center position of the axis of stem, disc and ontology; simple structure and convenient manufacturing. Common lined butterfly valve belongs to this category. Defects are big resistance...

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 of piston on extraction check valve. Depend on compressed air to overcome the functions of spring force and vapor pressure, making joy stick move downward, forcibly closing extraction check valve. Opening...

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 leakage is classified into external leakage and internal leakage. External leakage is commonly occurred in body, stem, connection part between packing and body. 1. The body is generally cast, which...

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 is developed which cannot only be used for high temperature media, but also can be used for low temperature. With industrial technologies highly developing, stricter requirements for valve industry...

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 protection performance. In some dangerous occasions, automated actuator can reduce harms to personnel. Some special valves are requested to be opened or closed urgently under particular situations....

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 Wenzhou", we hereby solemnly committed the following points: I. We firmly establish the "Quality First" thinking, constantly enhancing the quality awareness and social responsibility...

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 EN14341-2006 Industrial valves —Steel Check Valves Gate Valve: API 600 13th Steel Gate Valves-Flanged and Butt welding Ends, Bolted...

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 for chemical industry valves cannot be chosen with carefulness, it may damage equipment, or even resulting in accidents and disasters. The followings are the key points used to choose materials of...

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 influence on amplitude of reflected wave. Pores in steel ingot is pressed into area defects after being forged or rolled, advantageous for being detected by ultrasonic wave. 2. Shrinkage...

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 valve, which are dedicated valves meeting special requirements for pipeline transportation and having special functions. The ball valve used for pipeline is pipeline ball valve. Technical standards...

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 and assure its maximum efficiency. 1.Cut tube end square. Ream, burr and size. 2. Use sand cloth or steel wire brush to clean both tube and cut to bright metal. Steel wool is not recommended. 3. Apply...