The knife gate valve is also called the blade gate valve, slurry valve. it is the opening and closing of a ram, the ram of the motion direction and perpendicular to the direction of flow on the blade shape ram can cut fiber cutting medium, sealing face has two gate, two of the most commonly used mode gate valve sealing surface form a wedge, the wedge angle vary with the valve parameters, usually in the form of 50, wedge type knife gate valve disc can be made into a whole, is called a rigid disc; it can also make it generates trace of deformation of ram, in order to improve the manufacturability, make up for the sealing surface Angle in the process of our processing deviation, this damper is called elastic disc. Chamber body actually does not exist, ram in side guide groove inside the elevator, and from the bottom of the lugs compression on the seat, if you need to achieve high sealing medium, o-type sealing seat can be used to realize two-way sealing. Knife gate valve has a small installation space, working pressure is low, not easy to pile up sundry and the price is quite low.
When the knife gate valve is closed, the sealing surface can only rely on the medium pressure to seal, that depends on the medium pressure, the disc will be to the other side of the valve seat sealing surface pressure to ensure that the sealing surface sealing, it is the seal. Most type knife gate valve is made mandatory sealing, the valve is closed, to rely on outside force forced the ram pressure to the seat, to ensure the sealing surface of this kind of valve sealing shall generally be installed in the pipeline.¡¡
The knife gate valve driving modes: manual, electric, pneumatic, hydraulic, bevel gear, electric hydraulic and hydraulic drive mode, etc. the knife type gate valve shape: stem, non-rising stem two kinds. Type knife gate valve material: cast iron, cast steel, carbon steel, stainless steel liner, fluorine, etc. The knife gate valve seal: hard seal, soft seal, single seal, double sealed and other sealing material.
The heyday of the new material development and production of ultra-thin knife gate valve with its small volume, light weight, small flow resistance, and the advantages of easy to install, easy to remove completely solve the ordinary gate valve, flat gate valve, ball valve, globe valve, regulating valve, butterfly valve such as flow resistance of the valve, such as weight, difficult installation, covers an area of big problems. Knife gate valve, a large number of gm cut off valve and regulating valve has been replaced. Today, The largest dosing of knife gate valve in the world are the United States and Japan.
Knife gate valve entered into our country since 1980s t, in less than twenty years, its use range extended from ordinary field to wider all walks of life, from mining coal in power plants, slag discharge, discharging the gangue, the development of the urban sewage treatment, from the general industrial pipes to food, health, medicine and other professional pipeline system. In particular, the use of the knife gate valve as follows:
1. The mining, iron and steel industry, used in coal, the residue slurry, etc.;
2. Purification plant, used in waste water, mud, dirt and suspended solids with clear water;
3. The pulp paper industry - for any concentration and the mixture of material to water;
4, power plant ash - used for ash slurry.
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