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Next, let’s talk about several operating procedures for knife gate valves.

When a gate valve is closed, the sealing surfaces rely solely on the pressure of the medium to achieve a seal—specifically, the sealing surface of the gate is pressed against the valve seat on the opposite side by the medium’s pressure, thereby ensuring a tight seal. This type of sealing is known as self-sealing. In contrast, most gate valves employ forced sealing: when the valve is closed, an external force must be applied to press the gate against the valve seat in order to guarantee the sealing performance of the sealing surfaces. Such valves should be installed vertically in the pipeline.

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Next, let’s talk about whether knife gate valves have fire-resistant and anti-static requirements.

When an electrostatic knife gate valve is opened or closed, the sphere and the valve seat experience mutual friction. The static electricity generated by this friction tends to accumulate on the sphere—something that is unacceptable for ball valves used in gas, fuel, and chemical pipelines, as it could potentially lead to pipeline explosions. Ball valves with antistatic designs are equipped with static discharge devices.

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Next, let’s talk about some important considerations for the installation, operation, and maintenance of pneumatic knife gate valves.

Pneumatic knife gate valves have a wide range of applications, spanning from ordinary fields to more diverse industries—from coal preparation, gangue removal, and slag discharge in coal-fired power plants to urban wastewater treatment; from general industrial pipelines to pipeline systems used in food, sanitation, and pharmaceutical industries. So, what are the key considerations when installing, using, and maintaining pneumatic knife gate valves?

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What are the uses of a stainless steel knife gate valve?

The stainless steel knife gate valve is one type among many gate valves. Compared with conventional gate valve products, it has several distinctive features. For instance, its structure is simpler and its dimensions are smaller. It’s also very easy to install. Additionally, it boasts flexible operation and quick opening and closing. So, which media are suitable for stainless steel knife gate valves? Let’s take a closer look below.

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What performance characteristics does a stainless steel knife gate valve have?

The stainless steel knife gate valve employs a forced sealing mechanism: when the valve is closed, an external force is applied to press the gate tightly against the valve seat, ensuring a reliable seal. Equipped with a knife-type gate, this valve offers excellent shearing action, making it particularly suitable for handling difficult-to-control fluids such as slurries, powders, granules, and fibers. It is widely used in industries including papermaking, petrochemicals, mining, drainage, and food processing. A variety of models are available, and the valve can be fitted with electric or pneumatic actuators according to on-site control requirements, enabling automated operation.

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What are the uses of a stainless steel knife gate valve?

The emergence of stainless steel knife gate valves has addressed several issues associated with conventional gate valves, such as their heavy weight, high flow resistance, large footprint, and difficult installation. These valves can replace conventional globe valves and operate at working pressures ranging from 1.0 MPa to 2.5 MPa and temperatures from -29°C to 550°C. They feature a cutting action that effectively scrapes off adherent substances from sealing surfaces and automatically removes debris. By utilizing a blade to cut through blockages caused by heavy liquids, these valves can prevent sealing leaks due to corrosion. Designed specifically for some of the world’s most corrosive and abrasive operating environments, these valves are ideal for use in challenging industrial settings.

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