The difference between knife gate valve and gate valve

? ? Knife type gate valveAs an important control component in industrial pipelines, there are differences in multiple aspects compared to ordinary gate valves. From a structural perspective, ordinary gate valves are composed of multiple components such as gate plates, valve seats, valve bodies, and valve stems, and their structures are relatively complex; Knife gate valves are mainly composed of blades and valve bodies, with a simple and compact structure, and easy installation and maintenance.

In terms of operation, ordinary gate valves achieve opening and closing by driving the gate up and down through the valve stem, which is relatively time-consuming and suitable for low-frequency use scenarios. Knife type gate valves use blades as opening and closing components, which are flexible and fast to operate, and can effectively cut soft materials to prevent blockage.

The application scenarios of the two types of valves have their own characteristics. Ordinary gate valves are commonly used in pipeline systems that require strict sealing, such as gas, natural gas, steam, etc., due to their excellent sealing performance, and are widely favored in the chemical and energy fields. Knife type gate valves are widely used in urban water supply, sewage treatment, papermaking and other industries due to their lightweight characteristics, especially suitable for places with limited space.

In terms of applicable media, ordinary gate valves are more suitable for handling high-density, multi solid particles or corrosive media, such as high viscosity liquids, particle slurries, etc. Knife type gate valves are better at handling media with high flow rates, fast flow rates, and small amounts of suspended solids, such as low pressure and low viscosity media such as water, sewage, and pulp.

In terms of performance characteristics, ordinary gate valves are known for their excellent sealing performance and resistance to high temperature and high pressure, but they have a large volume and weight, making maintenance more complex. Knife gate valves have the advantages of full bore design, low flow resistance, strong medium passing capacity, and low maintenance costs.

When selecting, it should be based on specific working conditions: if it is necessary to handle low-pressure and high flow media containing suspended solids, it is recommended to use knife type gate valves; If the working conditions require high sealing and need to withstand high temperature and high pressure, ordinary gate valves are more suitable.