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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Valve variety is complex. As one of the valves, what advantages and disadvantages of the gate valves? What are the superiorites of gate valves compared with other valves? How to select gate valves? In this article, we will provide you with the advantages and disadvantages of gate valve in comparison with other valves and the commonly used gate valve selection introduction. 1. Basic introduction of gate valves The gate valve is a valve that moves along the straight direction of the center line...
A Comparison of Gate Valves and Other Valves Read
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Here are the briefly introduction of the classifications and working principles of some kinds of gate valves. Overview The valve industry plays a very important role in the development of national economy as an important link in the preparation of manufacturing industry. The domestic demand and export volume of valve products show an upward trend every month and quarter. The overall situation is good, and the competition among domestic valve enterprises is gradually improving. The valves products...
Classifications & Working Principles of Some Kinds of Gate Valves Read
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Don't expect that the gas can be saved if the gas valve is opened half. In fact, it is ok that the gas device is not damaged. Although using gas for cooking is cheaper than using other energy sources, a lot of gas is consumed every month. Recently, a friend said that if you only open half the main gas valve, the gas can be saved. Actually, many friends have followed this practice. In this regard, I am very worried, how can there be such a practice? Therefore, can we save gas by opening...
Can the Gas Be Saved by Half Opening the Valve? Read
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Flange gate valves are the gate valves with flange connections, which are common in our daily life. The flange gate valve is stable and reliable when it is used in the pipeline, and it can't be used in the high-pressure pipeline. A high pressure national standard cast steel gate valve is suitable for the conversion of nominal pressure from 4.0 MPa to 10.0 MPa (1 MPa = 10 kg), and the working temperature is from - 29 ℃ to 600 ℃ in petroleum, chemical, pharmaceutical, chemical fertilizer, electric...
Main Design Features and Advantages of Flange Gate Valves Read
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Slurry valves and slurry pipelines appeared and developed simultaneously in China. A slurry valve is an important part of slurry pipeline system. And its investment is the highest, accounting for about one fifth of the total investment of pipeline engineering. At present, the commonly used slurry valves mainly include ball valves, plug valves, gate valves, knife gate valves and so on. The slurry valve is optimized and improved on the basis of the general valve structure. Compared with other general...
A Brief Introduction to Common Valves in Slurry Pipelines Read
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Feasibility of mid-cavity pressurization Technical regulations The gate valve technical specification stipulates that in addition to the containment isolation valve, test holes need to be drilled for valve bonnets of some valves for periodical inspection and plugged with a screw plug. See the figure 5. The hole drilling should meet the relevant requirements for the specific technical design. Figure 5 Drilling inspection holes on the valve bonnet For containment...
Pressurization Methods for Periodic Seal Tests of Nuclear Power Plant Gate Valves(Part Two) Read
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IV. Performance tests of electric ball valves 1. When the electric ball valve of a certain specification is manufactured in batch, the following performance tests shall be carried out: ① The opening and closing torque of the electric ball valve under the working pressure condition ② The continuous opening and closing times can ensure the close tightness of the electric ball valve under the working pressure condition. ③ The flow resistance coefficient test of the electric ball valve under the...
How to Choose Electric Ball Valves? - Part Two Read
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Machine selection is a messy process, which is a big problem for many people. As long as you choose the right product, you can have the greatest effect and give full play to its maximum value. Next let us see the in-depth analysis of flange gate valve selection skills. The selection skills of flange gate valves mainly include the following two points: 1. Structure and operation principles of radiator flange gate valves The temperature control in the user's room is completed by the radiator thermostatic...
How to Select Flange Gate Valves? Read
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