Knife Gate Valve

Description：
The drive mode of this valve includes manual drive, electric drive, pneumatic drive, hydraulic drive, bevel gear drive, electric-hydraulic drive and pneumatic- hydraulic drive, etc. These models are optional for our customers. The external forms of knife gate valve include rising-stem type and non-rising-stem type. Cast iron, cast steel, carbon steel, stainless steel are all the materials of knife gate valves. This kind of knife gate valve has various seal types such as hard seal, soft seal, single seal, double seal and other types.

Application:
Knife gate valve came into Chinese market in the 80s. In less than 20 years, its usage has been spread from general field to various industries. For example, this kind of valve was used to choose the coal and discharge the gangue & slag in mine power plant in the past. However, this gate valve is used for wastewater treatment in the city development now. The application of this knife gate valve has extended from the general industrial pipeline to other professional pipeline system such as food, health and medicine. The super slim knife gate valves have the advantages of small size, small flow resistance, light weight, easy install and so on. This kind of knife gate valve can solve thoroughly the problems of the ordinary gate valve, flat-plate gate valve, ball valve, globe valve, control valve and butterfly valve. These valves have many shortcomings such as large flow resistance, heavy weight, difficult installation, large covering area and so on. After the appearance of knife gate valve the former cutting valves and regulating valves have been replaced.

Model and Usage Notes for Knife Gate Valve:

The opening and closing of this valve is the flashboard. The movement direction of the flashboard is vertical to the fluid direction. The manual knife gate valves can only be opened and closed fully. It can not be used as the adjusting and throttling. The flashboard has two seal surfaces. The two seal surfaces of the gate valve will form a wedge angle. The wedge angle will be different along with the valve parameters. Usually, the angle is 50. The flashboard of wedge type knife gate valve can be made into a whole part. This flashboard is called firm flashboard; it can also be made into a deformed flashboard to improve its technology and make up the deviation of seal face angle. Then the flashboard is called elastic flashboard. When knife gate valve is closed, the seal surface can be closed only by medium pressure. Namely, the seal surface of flashboard will be pressed toward the valve seat on the other side though medium pressure. It is self seal. Most of knife gate valves adopt compulsory seal. Namely, when the valve is closed, the flashboard should be pressed by force toward the valve seat to ensure the tightness of sealing surface. Generally, this kind of valve shall be installed horizontally in pipeline.