4. Sealing elements Although the structure of the ball valve is simple, there are many factors that affect the final sealing of the ball valve due to the pressure self-sealing of media and the special structure of the ball. 4.1 Quality of sealing pairs The quality of sealing pairs of ball valves mainly manifests in the roundness of the ball and surface roughness of sealing surfaces of the ball and valve seat. The roundness of the sphere affects the...
Sealing Elements of Cryogenic Ball Valves (Part Two) Read
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1. Overview A ball valve is widely used in various working conditions due to its simple structure, small installation space and relying on medium force to seal and not being affected by external driving force. At present, cryogenic ball valves are commonly used in LNG receiving stations. The cryogenic ball valve accounts for 80% of the number of valves in the entire LNG receiving station. There is a phenomenon of internal leakages for cryogenic ball valves...
Sealing Elements of Cryogenic Ball Valves (Part One) Read
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Product descriptions An insulation ball valve is also called a jacketed ball valve. A jacketed ball valve is welded with a metal jacket on the basis of a ball valve and then the jacket is injected with steam, other heat preservation or cold preservation media to ensure that the medium in the valve can work normally. The jacketed ball valve has good heat preservation and cold preservation characteristics, and the valve diameter is the same as the pipe diameter. At...
Wafer Jacked Ball Valves in SS 304 Read
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3.2 Reducing center of gravity, dead-weight and heights of the part and whole valve The main factors affecting the anti seismic performance of the valve are dead-weight and center of gravity of the valve extension mechanism. The main components include the valve body extension, bonnet, bracket and electric actuator. Compared with a split flange structure, the main structural changes are the valve bonnet and bracket for the valve adopting an integral intermediate...
Optimized Intermediate Flange Structure of Nuclear Grade Large Diameter Gate Valves (Part Two) Read
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Abstract: The differences between the integral intermediate flange structure and split flange structure of the large diameter electric gate valve are analyzed, and advantages of the integral intermediate flange structure concerning anti seismic performance of the valve and characteristics of reducing costs and increasing efficiency are explained in this article. 1. Overview Nuclear power valves are important safety equipment in nuclear...
Optimized Intermediate Flange Structure of Nuclear Grade Large Diameter Gate Valves (Part One) Read
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2.4 Results and analysis of the traditional mould test Using the traditional mold structure test, it was found that the mold and the valve sealing gasket part and the cryogenic valve itself leaked. After the test, it was found that the originally tightened long bolts were loose after checking the valve and mould. According to the analysis of the test results, the long bolts become loose due to expansion caused by heat and contraction caused by cold of...
Analysis and Improvement of Structure of the Cryogenic Valve Test Mold (Part Two) Read
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Abstract The causes of leakages at the sealing gasket of the traditional cryogenic valve test mold and the loosening of the flange bolts of the end blind plate are analyzed, and the cryogenic valve test mold with a structure of the butt welding end adopting a combination of the clamp through flange and blind flange is introduced. The structure and clamping method of traditional test molds for cryogenic valves are improved and the problem of deformation...
Analysis and Improvement of Structure of the Cryogenic Valve Test Mold (Part One) Read
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Gate valves usually have structural design such as single discs, double discs, wedges and parallel. Double wedges Z42 and Z62 series and elastic wedge Z40 and Z60 series are the most widely used. The wedge automatically fits the valve seats on both sides when the Z42 and Z62 series valves are closed, automatically compensating the processing position error of the wedge angle, while Z40 and Z60 series rely on...
Abnormal Pressure Increases in Middle Cavities of Gate Valves Read
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Electric butterfly valves are widely used in dusty cold air or hot air gas pipelines of ventilation and environmental protection projects in metallurgy, chemical industry, building materials, power stations and glass. An electric butterfly valve as a device controlling the gas medium plays a vital role in the pipeline. Its good sealing is also very important. How to deal with the poor sealing of electric butterfly valves? There are three following reasons for leakages...
How to Deal With the Poor Seal of Electric Butterfly Valves? Read
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