In current large and medium-sized ethylene plants, as well as in coal-to-methanol purification units, deep cryogenic separation is commonly employed for components such as hydrogen and methane. To meet these requirements, low-temperature valves are widely used. Understanding the design requirements and special structures of low-temperature valves is crucial to avoid issues during selection and installation. Low-temperature valves, especially ultra-low-temperature valves, operate at extremely low...
Design and Installation Principles of Low-Temperature Valves Read
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Metal valves are often the most vulnerable components prone to corrosion failure in engineering equipment. Typically, the sealing surface, valve stem, diaphragm, small spring, and other valve parts of metal valves are made of primary materials, while the valve body and bonnet are made of secondary or tertiary materials. For valves used in high-pressure, highly toxic, flammable, explosive, or radioactive media, materials with minimal corrosiveness are selected. Valve Corrosion Metal valves, operating...
How to Combat Valve Corrosion? Read
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Gasification is a process that utilizes coal to produce gas through pressurized gasification. The entire process boasts a high level of automation. In process control, the quality of actuator control is closely linked to the stability of production conditions. Therefore, the selection of actuators is particularly important. For chemical enterprises with high safety and explosion-proof requirements, pneumatic control valves are widely used. The selection of pneumatic control valves generally involves...
Selection Method of Pneumatic Control Valves in Coal Gasification Processes Read
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As a valve that opens when the pipeline system flows forward and closes when it flows backward, the check valve is primarily used to prevent medium backflow, pump and motor reverse rotation, and medium discharge from containers. Currently, the most common types are the swing check valve, where the valve disc rotates around the valve body pin, and the lift check valve, where the valve disc moves along the vertical centerline of the valve body. However, both of these valve structures suffer from the...
The Structural Characteristics of The Slow-closing Check Valve Read
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Pneumatic fluorine-lined butterfly valves utilize polytetrafluoroethylene (PTFE) lined butterfly discs with spherical sealing surfaces, offering easy operation, tight sealing performance, and extended lifespan. They can be used for quick shutoff or flow regulation and are suitable for applications requiring reliable sealing and good regulating characteristics. These valves consist of pneumatic actuators and butterfly valves. Pneumatic butterfly valves use a circular disc that rotates with the valve...
How to Select Pneumatic Fluorine-lined Butterfly Valves Read
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Gate valves and butterfly valves serve the purpose of opening, closing, and regulating flow in pipelines. However, there are considerations to be made during the selection process. In water supply networks, larger diameter pipelines often opt for butterfly valves to minimize soil cover depth. For situations where soil depth isn't a significant concern, gate valves are preferred to minimize costs, although gate valves of the same specifications tend to be more expensive than butterfly valves....
How to Make Appropriate Choices Between Gate Valves and Butterfly Valves? Read
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Ball valves are prominent mechanical components in the valve market, consisting of the valve body, seat, ball, stem, and transmission device. Their functionality, whether switching or regulating flow, is achieved by actuating the rotation of the ball core. Widely utilized across various industries like chemicals, environmental protection, water treatment, urban construction, machinery, and food, ball valves are highly versatile and popular. There's a diverse range of ball valves available, categorized...
The Difference Between Full Bore and Reduced Bore Ball Valves Read
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The single-acting pneumatic ball valves are available in normally open type, typically open for ventilation and closed for air spring return. For double-acting pneumatic ball valves, ventilation opens, and in case of ventilation closure or air source fault, the pneumatic actuator resets the valve. These actuators boast rapid execution speeds, with the fastest switching occurring in 0.05 seconds per cycle, earning them the moniker of "pneumatic fast cut-off ball valves." Equipped with various...
The difference Between Single-acting and Double-acting Pneumatic Ball Valves Read
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The pneumatic butterfly valve operates by rotating a circular butterfly plate to open and close the valve. Primarily used for on-off control, it can also be adapted for throttling applications as a segment valve. Increasingly, the disc valve finds utility in low-pressure, large-diameter pipelines. The butterfly valve offers several notable advantages, including its simple structure, compact size, lightweight construction, and cost-effectiveness. Particularly noteworthy are the characteristics of...
Introduction of Pneumatic Butterfly Valves Read
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