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The Difference Between Knife Gate Valve and Ordinary Gate Valve

There are many types of gate valves, knife gate valve is one of them, also called knife gate valve. Gate valve can be divided into flat gate valve and knife gate valve according to the structure type. Knife gate valves can be divided into flange type, ear type and wafer type according to their connection methods.


The difference between the knife gate valve and the ordinary gate valve is that the structure is simple, the opening and closing mechanism is a gate, and the movement direction of the gate is perpendicular to the fluid direction. Small in size, flexible in operation, and easy to install, it is more suitable for medium with high consistency and solid particles. As can be seen from the name, the knife gate valve mainly relies on the knife gate to cut off the medium. The sluice has two sealing surfaces that form a wedge. The gate can be made into an integral rigid gate, or an elastic gate, which can produce slight deformation and improve the sealing performance from the process. All in all, compared with ordinary gate valves, knife gate valves mainly highlight some of the advantages of the following products:


(1) The U-shaped gasket has a good sealing effect.


(2) The full-bore design enables the medium to pass through. At the same time, under the condition of dirty medium, it is easy to install, disassemble and maintain, and the seal of the valve can be replaced without removing the valve, which makes the maintenance of the valve easier.


(3) The gate with gate knife function has good gate breaking effect, can effectively cut off all kinds of debris in the medium, and solve the leakage phenomenon of the media containing blocks, particles and fibers after the gate is broken.


(4) The ultra-short structural length of the knife gate valve, small size, small flow resistance, light weight, material saving, and small effective space occupation.


Gate valves are used to cut off or connect medium transmission, and are suitable for pipeline systems in petroleum, chemical, thermal power plants and other industrial fields. A gate valve can only be fully opened and disconnected in the pipeline, which means it cannot be used for regulation and throttling. Gate valves offer good on/off or shut-off functionality, very little pressure drop during operation, and are bidirectional. At the same time, as metal-to-metal valve seats, these valves can be adapted to specific operating high pressure, high temperature operating conditions.


Although the price of the knife gate valve is about 20% higher than that of the ordinary gate valve, its performance has been widely recognized by the market, and it has quietly entered the list of Weidouli's favorite product series. After fifteen years of research and development and production, with senior production experience and advanced technical level, with a number of formal and modern production bases, it has provided a large number of stable products for the knife gate valve market, and has a good reputation. When you want to use a knife gate valve, choose Weidouli Valves!

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