The installation of a ventilation butterfly valve is crucial.

Release time:

2021-08-30

The ventilation butterfly valve is generally installed horizontally in pipelines and is used in ventilation and environmental protection systems—such as those found in the chemical, building materials, power plant, and glass industries—to regulate flow or shut off gas media in pipelines carrying dusty cold or hot air. It serves as a pipeline control device for this purpose.

yingbei The installation of a ventilation butterfly valve is crucial, as the quality of installation directly affects the future performance and longevity of the equipment. Therefore, when installing a ventilation butterfly valve, we must be extremely careful and pay close attention to relevant considerations! Now, let’s explore this topic together with Hao Tian’s editor!

　　The ventilation butterfly valve features a new structural design that combines a centerline disc with a short, welded steel plate. This design is compact, lightweight, easy to install, offers low flow resistance, and provides high flow capacity. It also effectively avoids the effects of thermal expansion at high temperatures and ensures effortless operation. The valve contains no connecting rods, bolts, or similar components, ensuring reliable performance and a long service life. As a non-hermetic butterfly valve, it is widely used in various industrial processes—including those involving building materials, metallurgy, mining, and power—on pipelines where the medium temperature does not exceed 300℃ and the nominal pressure is 0.1 MPa, serving to connect, open/close, or regulate the flow of media.

　　The ventilation butterfly valve should generally be installed horizontally in pipelines. It is used in ventilation and environmental protection systems in industries such as chemical engineering, building materials, power plants, and glass manufacturing, where it serves as a pipeline control device for regulating gas flow or shutting off the flow of dusty, cold or hot air gases.

　　The three-way control valve can replace two separate two-way control valves used simultaneously, serving functions such as flow division, flow combination, and proportional adjustment between two phases. According to their operating mode, three-way control valves can be classified as follows: positive-action—electrically closed (when the electrical signal increases, the valve stem moves downward), designated as “Type B”; and reverse-action—electrically open (when the electrical signal increases, the valve stem moves upward), designated as “Type K.” Three-way control valves feature a compact structure, light weight, sensitive response, precise flow characteristics, and the ability to directly receive control signals from regulating instruments (such as 4–20 mA DC, 0–10 mA DC, or 1–5 V DC) as well as single-phase power supply for operation. They enable automatic regulation and control of fluid media in process pipelines, and are widely used to maintain process parameters—including pressure, flow rate, temperature, and liquid level—of gases, liquids, steam, and other media at specified setpoints with high precision.

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?