The slurry valve manufacturer introduces to you the stainless steel knife gate valve and the pneumatic knife-type gate valve.

Release time:

2023-05-11

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.

Stainless Steel Knife Gate Valve, Knife Gate Valve, Manual Single-Clamp Knife Gate Valve—Key Specifications:Nominal Diameter (MPa) | Shell Test Pressure (MPa) | Sealing Test Pressure (MPa) | Operating Temperature | Applicable Media1.0 | 1.6 | 1.5 | 2.4 | 1.1 | 1.8 ≤900℃Paper pulp, wastewater, mineral slurry, ash, slag-water mixturesSingle-Clamp Knife Gate Valve, Single-Clamp Slurry Shut-off Valve, Single-Clamp Blade Shut-off Valve—Key Component Materials:Housing and Bonnet | Gate Plate | Valve Seat Sealing Surface:Stainless Steel, Carbon Steel, Gray Cast Iron | Carbon Steel, Stainless Steel | Stainless Steel, Plastic, PTFE, Stainless Steel, Hard AlloyKnife Gate Valve for Slurry, Knife Gate Valve for Slag Removal, Single-Clamp Slag Slurry Shut-off Valve

　　Stainless Steel Knife Gate Valve, Pneumatic Knife Gate Valve—Common Issues and Characteristics When Using U.S. Standard Knife Gate Valves: The closing member of a knife gate valve is a gate plate, whose motion direction is perpendicular to the flow direction of the fluid. A knife gate valve can only be fully opened or fully closed; it cannot be used for throttling or flow regulation. The gate plate has two sealing surfaces. In commonly used knife gate valves, these two sealing surfaces form a wedge shape, with the wedge angle varying depending on the valve’s specifications—typically around 50 degrees. The gate plate of a wedge-type knife gate valve can be made as a single piece, known as a rigid gate plate; alternatively, it can be designed to allow slight deformation, thereby improving its manufacturability and compensating for any inaccuracies in the sealing surface angle that may arise during manufacturing. Such gate plates are referred to as flexible gate plates. When a knife gate valve is closed, the sealing surfaces can rely solely on the pressure of the medium itself to achieve sealing—that is, the medium pressure forces the sealing surface of the gate plate against the high-pressure side, ensuring a tight seal. This is known as self-sealing. However, most knife gate valves employ forced sealing: when the valve is closed, an external force must be applied to press the gate plate firmly against the high-pressure side, thus guaranteeing the integrity of the sealing surfaces.

　　The closing member of a stainless steel knife gate valve is a gate plate. The motion direction of the gate plate is perpendicular to the flow direction of the fluid. Manual knife gate valves can only be fully opened or fully closed; they cannot be used for fine adjustment or throttling. The gate plate has two sealing surfaces. In commonly used knife gate valves, these two sealing surfaces form a wedge shape, with the wedge angle varying depending on the valve’s specific parameters—typically around 50 degrees. The gate plate of a wedge-type knife gate valve can be made as a single piece, known as a rigid gate plate; alternatively, it can be designed to allow slight deformation, thereby improving its operational performance and compensating for any inaccuracies in the sealing surface angle that may arise during manufacturing. Such gate plates are referred to as flexible gate plates. Most knife gate valves rely on forced sealing—that is, when the valve is closed, an external force is applied to press the gate plate firmly against the high-pressure seat, ensuring a tight seal. 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?

Slurry valve manufacturer: How to improve the compliance rate and productivity of stainless steel gate valves and prevent a large number of maintenance tasks—this is Skafu Valve’s top priority. The stainless steel gate plate effectively prevents sealing leaks caused by corrosion. The stainless steel gate plate effectively prevents sealing leaks caused by corrosion. Features: This valve boasts advantages such as simple and compact structure, reasonable design, lightweight and material-saving, reliable sealing, easy and flexible operation, small size, smooth flow passage, low fluid density, light weight, ease of installation, and ease of disassembly.