Detailed instructions for using the slurry valve

Release time:

2021-12-14

The structural configuration and features of the slurry valve—specifically, the valve body structure and sealing method—are as follows: The new type of slurry valve comes in two designs: clamp-type and monolithic. The clamp-type valve body employs a composite “U”-shaped and “T”-shaped composite structure equipped with advanced composite materials for sealing. The monolithic valve body uses an “O”-shaped composite sealing structure, which overcomes the drawbacks of the original clamp-type slurry valve, such as the tendency of the “U”-shaped sealing gasket to shift, deform, and leak media under stress.

　　The structural configuration and features of the slurry valve—specifically, the valve body structure and sealing method—are as follows: The new type of slurry valve comes in two designs: clamp-type and monolithic. The clamp-type valve body employs a composite “U”-shaped and “T”-shaped composite structure equipped with composite materials for sealing. The monolithic valve body uses an “O”-shaped composite sealing structure. These designs address the shortcomings of the original clamp-type slurry valve, which suffered from issues such as displacement and deformation of the “U”-shaped sealing gasket under stress, as well as leakage of the medium.

　　The gate plate adopts a knife-type structure, which effectively addresses issues such as slurry settling in the sealing groove, leading to imperfect valve closure and external leakage. The actuator options are as follows: Manual actuator: Simple operation, suitable for valves with smaller torque requirements. Electro-hydraulic actuator: Suitable for valves with larger torque requirements; features adjustable force and speed, and allows locking at any desired position.

　　Slurry valves are suitable for media in the mining and iron and steel industries—used for coal slurries, filter cake slurries, and the like. They are also used in purification equipment—for wastewater, sludge, sewage, and clarified water containing suspended solids. In the paper-making industry, they are employed for pulp of any concentration as well as for mixtures of pulp and water. In the sugar industry, they are utilized for wash liquor, syrups, juice extraction, fruit juices, and similar applications.

　　Food Industry—used for washing and flushing equipment, grain-handling systems, and maltose, among other applications. Slurry valves are widely suitable for oil, water, and steam pipelines in industries such as petroleum, chemical engineering, and thermal power plants, serving as on-off control devices for media flow. These valves feature a compact structure, a rational design, excellent valve rigidity, smooth flow passages, and low flow resistance coefficients.

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?