Flat gate valves have following structural features: 1. The sealing structure of seat is elastic and equipped with pre-tightening force. The sealing between seat and sealing face is always face-to-face sealing. 2. The seat has self-cleaning performance, and it cannot be washed out directly by media when the valve is on or off. The seat should be made from materials having lubrication and wearing resistance. 3. Obstacles on actuator of flat gate valves cannot impact other parts of valves....
Structural Features of Flat Gate Valves Read
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Low temperature globe valves are suitable for regulating system of storage equipments for low temperature fluids, having features of flexible operation, reliable sealing, etc. The globe valves can be also used for other low temperature or copious cooling media. Normal temperature globe valves refer to the globe valves used for the media whose temperature ranges from -40℃ to 500℃. The materials of body are also different. Low temperature globe valves refer to the globe valves used for low temperature...
Design Requirements for Low Temperature Globe Valves Read
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Since valves are developed, pneumatic valves cannot be replaced. Pneumatic valves play their own unique role in water supply system. Pneumatic valves are mainly used in chemical engineering, pharmacy, oilfields, micro-electronics, electricity generation, power transmission and other industrial fields, which improve people’s lives. Actuators used in valves can be classified into pneumatic actuators, electric actuators and hydraulic actuators. Air diaphragm actuator is also one...
Pneumatic Valves Used in Water Supply System Read
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When high vacuum butterfly valve is used, temperature has great influences on its performance. High temperature impacts on high vacuum butterfly valve: When the valve is used in the scope of creep temperature, prestressing force on bolts falls due to flanges, bolts and gaskets loosening. Flange connection may also have the same phenomenon under the condition of temperature gradient. For this, bearing capacity on flange connection may be decreased, resulting in leakage. When temperature rises,...
Influences of Temperature on High Vacuum Butterfly Valve Read
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In general, stainless steel ball valves are suitable for media, such as water, solvents, acids and gas. High quality stainless steel ball valves are also appropriate for media having wicked working conditions, like some corrosive media. And stainless steel ball valves are widely applied in various industries. The followings are the tips which need to be noticed when installing stainless steel ball valves, especially under some particular environments: 1. Before being connected with pipe,...
Tips for Installing Stainless Steel Ball Valves Read
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Long distance pipeline is a global energy supply line, from Arctic Circle to Equator, high mountains to seabed, high lands to deserts, crossing through earthquake zone, marshland, rivers, lakes and mountain slopes. Some of pipelines are erect. Some are buried under the ground and some are operated in the field. Difficult maintenance requires service of pipeline as long as 30 years. Generally, transmitted oil and gas still contain sulfur, rust and metal particles although through processing. And...
High Requirements of Pipe Transmission on Ball Valves Read
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With large programs being put into construction, valves are widely used in power, petroleum, chemical industry, urban supply and drain water system. Particularly, butterfly valves have large usage. So customers are facing with more and more problems when using butterfly valves. The followings are the problems that exist on hard seal butterfly valve: 1. Multi-level soft and hard folded sealing rings are fixed on the disc. So, when disc is opened, media form positive washing on sealing...
Problems Exist on Hard Seal Butterfly Valve Read
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Rubber lined valves have both cutting-off and flow regulation performance. Rubber line valves are convenient for on-off without influence on flow, ensuring the repeatability of flow. The valves open slowly, reducing the impact on instruments caused by instant pipe pressure. Rubber lined valves are exclusively used for controlling media having strong corrosion. Surface of lumen of body is covered various types of rubber, suitable for different working temperatures and fluid pipelines, having high...
Notes for Using Rubber Lined Valves Read
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Pneumatic tefulong butterfly valves use disc with ball sealing surface cylinder packed by PTFE, having convenient operation, rigorous sealing performance and long service life. The butterfly valves can be used for rapidly cutting off or regulating flow. Pneumatic tefulong butterfly valves are suitable for the situations which need reliable sealing and good regulating performance. Pneumatic tefulong butterfly valves consist of pneumatic actuator and butterfly valves. The butterfly valves...
Features and Usage of Pneumatic Tefulong Butterfly Valves Read
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Valves are a kind of hardware products in common use. There are definite requirements for valves before or during assembling. Otherwise, valves having been assembled cannot show their excellent properties. Requirements for valves before assembling: 1. According processing requirements, some components need to be polished. Burrs are not allowed to exist on the surface of components; 2. All of components should be degreased; 3. After degreasing, all of components should be passivated...
Requirements for Assembling Technologies of Valves Read
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