The imported electro-hydraulic knife gate valve is a kind of gate valve, which uses an electro-hydraulic device to control the opening and closing of the valve. The body is made of carbon steel and lined with engineered ceramic. The nominal diameter of the valve is generally DN50-400, and the nominal pressure is PN10-6.4mpa。
The driving mode of the imported electro-hydraulic knife gate valve is electro-hydraulic linkage, which controls the opening and closing of the valve through reciprocating push, and at the same time cooperates with the signal to carry out output control, which can realize remote control. The valve is mainly used for the transportation of ore slurry and ash slurry and other media.
In addition, imported electro-hydraulic knife gate valves are divided into two types: soft seal and hard seal. The soft seal has an active onset and a replaceable rubber ring, which can be easily replaced, and can also be made into PTFE seal according to the customer's needs, which can meet the requirements of good sealing. The connection method of imported electro-hydraulic knife gate valve is generally a clamp-on connection.
The driving mode of imported electro-hydraulic knife gate valve has the following characteristics:
1.The hydraulic oil is driven by the motor, and then the hydraulic rod is driven by the hydraulic oil to reciprocate, so as to realize the opening and closing of the valve.
2.In the process of opening and closing the valve, the operation of the valve plate is relatively stable, and the hydraulic driving force is large, which is usually used in the case of large resistance to the installation pipeline.
3.It can be equipped with sensors and digital display devices for long-distance control, and is widely used in metallurgy, electric power, coal mining, water conservancy and other industries.
4.It can realize stepless force adjustment, the overall structure of the valve is compact, the hydraulic transmission efficiency can reach 80%, and the blade plate of the knife gate valve is blade-shaped, which can cut off the medium such as fiber, pulp and wood pulp.
5.The ram can also be lifted to scrape out the adhesive on the sealing surface, and has the function of automatically removing debris.
There are some differences between the imported electro-hydraulic knife gate valve and the electric knife gate valve in terms of structure, working principle and application.
Structure: The imported electro-hydraulic knife gate valve is mainly composed of valve body, valve cover, valve stem, blade plate, sealing ring, motor and hydraulic device. Among them, the valve body and bonnet are made of casting or forging process, the valve stem and blade are made of integral structure, the sealing ring is made of wear-resistant and high-temperature resistant materials, and the motor and hydraulic device are the key components to control the valve switch. The opening and closing parts of the electric knife gate valve are rams, and the fluid direction is perpendicular to the direction of movement of the ram.
Working principle: The working principle of the imported electro-hydraulic knife gate valve is to drive the hydraulic pump through the motor to press the liquid into the hydraulic cylinder, so that the valve stem and the blade plate move up or down, so as to realize the opening and closing of the valve. When the valve is closed, a seal is formed between the blade and the valve seat, preventing the leakage of the medium. When the valve is opened, the gap between the blade and the seat becomes larger, and the medium can flow smoothly. The opening and closing part of the electric knife gate valve is the gate, when the knife gate valve is open, the blade rises, and the fluid can enter and exit the pipeline through the valve. When the valve needs to be closed, the control mechanism lowers the blade so that the blade is in contact with the sealing surface of the valve base, thus completely cutting off the fluid in the pipeline.
Application: Imported electro-hydraulic knife gate valves are widely used in pipelines in petrochemical, metallurgy, electric power, water treatment and other industries to control the flow and pressure of various media. The electric knife gate valve is mainly used in slag, dust, pulp, sewage, asphalt, cement and other transportation pipelines in industrial and mining, environmental protection, food and other industries to play the role of connecting and closing pipelines.
To sum up, although the imported electro-hydraulic knife gate valve and the electric knife gate valve are both a kind of knife gate valve, there are differences in structure, working principle and application.