Let’s take a closer look at the performance of the manual slide valve.

Release time:

2022-02-23

The manual slide valve, also known as the manual screw gate valve or slide gate, is typically used in conjunction with dischargers. The diameter of the manual screw gate valve is matched to the inlet port of the discharger, and it comes in two types: square and round. The key advantage of this valve is that its body has a smooth, continuous flow path without any grooves, ensuring that the medium cannot get stuck or blocked. Additionally, the valve features full-flow passage characteristics, making it ideal for use in pipelines conveying powdered or granular media.

　　The sealing structure of the slide valve can be categorized into soft-seal and hard-seal types. Manual slide valves feature excellent manufacturability and a compact structure. The sealing seat is designed as a movable component, equipped with wear-resistant and self-compensating features, thus extending its service life. During the closing and opening processes, the valve seat remains tightly engaged with the gate, ensuring stable valve operation and providing reliable media shut-off performance. By installing a handwheel, the valve can be directly operated for easy opening and closing.

　　The manual slide valve is a key piece of equipment for controlling the flow and conveying of powders, granular materials, and small particulate materials. The electric slide valve is widely used in industries such as metallurgy, mining, building materials, grain processing, and chemical engineering. Equipped with electric, pneumatic, or electro-hydraulic actuators, this gate valve serves as an ideal device for precisely controlling flow rates and providing rapid shut-off. With its compact structure, excellent wear resistance, and minimal leakage, the slide valve features easy operation, quick response, and effortless handling. It can operate reliably even in environments characterized by high temperatures, high dust levels, and strong magnetic fields.

　　Pneumatic slide valves, electric slide valves, and manual slide valves are mostly used in conjunction with dischargers and come in two types: square and round openings. The type of opening for pneumatic slide valves should be selected according to the shape of the discharger. Slide valves manufactured by Tianze Machinery are durable, feature low flow resistance, have a compact size and light weight, are easy to maintain, and find wide application. The sealing structure of slide valves can be either soft-seal or hard-seal. Manual slide valves boast excellent workability and a compact structure; their sealing seats are designed with a movable structure that provides wear resistance and automatic compensation, thus extending their service life.

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?