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Are you familiar with stainless steel knife gate valves? Let’s learn more about them!

The stainless steel knife gate valve is a common type of electric gate valve and can also be regarded as a very familiar switch. Its shape somewhat resembles the ancient hay cutter, which is why people habitually refer to this type of switch valve as a "knife gate valve." Many also call it a "knife valve." The shape of the knife gate valve can be vividly described in this way. Nowadays, knife gate valves are not only used in circuits but are increasingly employed across most industries in industrial piping systems.

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What are the characteristics of stainless steel knife gate valves? How can their service life be ensured?

Stainless steel gate valves come in two types: rising stem and non-rising stem. The materials used include cast iron, cast steel, carbon steel, stainless steel, and fluoropolymer lining. These valves employ a forced sealing mechanism: when the valve is closed, an external force is applied to press the gate firmly against the valve seat, ensuring a tight seal on the sealing surfaces. The valve can be actuated manually, electrically, pneumatically, hydraulically, via bevel gears, electro-hydraulically, or electro-pneumatically. So, what are its key features? Let’s find out below.

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Introduction to the Features, Precautions, and Applications of Stainless Steel Gate Valves

The stainless steel knife gate valve features a knife-type gate switch with excellent shearing performance, making it ideal for handling difficult-to-control fluids such as slurries, powders, and fibers. It is widely used in industries including papermaking, petrochemicals, mining, drainage, and food processing. A variety of valve seat options are available, and the valve can be equipped with electric or pneumatic actuators according to site control requirements, enabling automated valve operation.

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Let’s talk about how to use pneumatic knife gate valves.

The knife gate valve, also known as the knife-type gate valve, blade gate valve, slurry valve, or mud valve, features a gate plate as its closing member. The motion direction of the gate plate is perpendicular to the flow direction of the fluid. The medium is cut off by a blade-shaped gate plate that can slice through fibrous materials. The gate plate has two sealing surfaces; in commonly used wedge-type gate valves, these two sealing surfaces form a wedge shape, with the wedge angle varying depending on the valve’s specifications.

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What are the general advantages of slurry valves?

The slurry valve has the following advantages: Its structure is simple because it adopts a flange-type design. Compared with conventional valves, this valve boasts a smaller size and lighter weight. Its installation location is unrestricted, making it easy to set up. Due to its compact footprint and minimal space requirements, it plays a positive role in reducing plant floor area, lowering building height, and saving on capital investment.

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Learn about the development history of knife gate valves.

Gate valves entered China in the 1980s, and within less than two decades, their application scope has expanded from conventional areas to a wide range of industries. They are now used not only in coal preparation, gangue removal, and slag discharge at mines and power plants, but also in urban wastewater treatment. Moreover, their use has extended from general industrial pipelines to specialized pipeline systems in sectors such as food, sanitation, and pharmaceuticals.

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