Let’s take a closer look at the uses of the plug valve.

Release time:

2022-05-17

Features of manual slide valves: Manual slide valves are often used in conjunction with discharging equipment or hoppers. The manual screw gate valve features a flange connection for easy installation, and its inlet and outlet ports come in both square and round designs. Depending on the diameter size, there are dozens of different specifications available. These valves are widely used in industries such as metallurgy, carbon production, chemical engineering, and building materials.

　　Features of manual slide valves: Manual slide valves are often used in conjunction with discharging equipment or hoppers. The manual screw gate valve features a flange connection for easy installation, and its inlet and outlet ports come in both square and round shapes. Depending on the diameter size, there are dozens of different specifications available. These valves are widely used in industries such as metallurgy, carbon products, chemical engineering, and building materials.

　　The manual slide valve features a simple and compact structure, a reasonable design, reliable sealing, lightweight and responsive operation, small size, smooth flow passage, low resistance, easy installation, and easy disassembly. The manual screw gate valve can be installed either horizontally or vertically and boasts characteristics such as wear resistance, automatic compensation, and a long service life.

　　During normal operation, all transmission parts of the manual slide valve should be inspected regularly and lubricated properly to ensure proper maintenance. Key points and features for using electric slide valves: The closing member of a slide valve is a gate, and the direction of movement of the gate is perpendicular to the flow direction of the fluid. Slide valves can only be fully opened or fully closed; they cannot be used for regulation or throttling.

　　The gate has two sealing surfaces. In commonly used gate valves, these two sealing surfaces form a wedge shape, with the wedge angle varying depending on the valve’s specifications—typically 50 degrees. The gate of a wedge-type gate valve can be made as a single piece, known as a rigid gate; alternatively, it can be designed to allow for slight deformation, thereby improving manufacturability and compensating for any deviations in the sealing surface angle that may occur during machining. Such gates are referred to as flexible gates. When the gate valve is closed, the sealing surfaces can rely solely on the pressure of the medium to achieve a tight seal.

The vast majority of stainless steel knife gate valves employ forced sealing: that is, when the valve is closed, an external force is applied to forcibly press the gate against the high-pressure valve seat, thereby ensuring a tight seal on the sealing surfaces. Some gates can also be designed to undergo slight deformation, which helps improve their manufacturability and compensate for any misalignment in the sealing surface angles that may occur during the manufacturing process. Such gates are referred to as flexible gates. The majority of knife gate valves rely on forced sealing—meaning that when the valve is closed, an external force is used to press the gate firmly against the high-pressure valve seat, thus guaranteeing a secure seal on the sealing surfaces. Valves of this type are generally installed horizontally in pipelines.

2023-05-11

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.

2023-05-11

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.

2023-05-11

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?

2023-05-11

Slurry Valve Manufacturer: How are stainless steel knife gate valves good?