Electric gate valve

Product Description
The gate valve is also called a manual knife gate valve. The knife gate valve is a valve in which the gate plate and the valve seat are always in close contact and sealed. The principle is that there is a round opening with a diameter of , through the opening and closing of the gate, the circular mouth of the gate and the diameter are completely separated and consistent. During the closing and opening process, the valve seat and the gate plate are always moving in close contact, which makes the valve opening and closing force stable and has the characteristics of cutting off the medium.
Main features
Small fluid resistance. The medium through hole inside the gate body is straight, and the medium does not change its flow direction when flowing through, so the flow resistance is small.
It takes less effort to open and close. When opening and closing, the movement direction of the valve plate is perpendicular to the direction of medium flow. Compared with others, opening and closing is more labor-saving.
The flow direction of the medium is generally not restricted. The medium can flow in any direction from both sides and can be connected or cut off. Easy to install and used in pipelines where the flow direction of the medium may change.
The main advantage
is that there are no grooves in the diameter of the valve body, the medium will not be blocked and blocked, and it has full-through flow characteristics. Its sealing structure can be divided into soft seal and hard seal structure.
The penetrating knife gate valve has the characteristics of precise structure, good craftsmanship, and compact structure. The sealing valve seat is a movable structure designed with anti-wear and automatic compensation functions, so it has a longer life.
Main Disadvantages
High height and long opening and closing time. Since the valve plate needs to be completely lifted above the valve seat through hole when opening, and the valve plate needs to be completely dropped to block the valve seat through hole when closing, the opening and closing stroke of the valve plate is very large, and its height also increases accordingly. longer time.
The sealing surface is prone to scratches. When opening and closing, there is relative sliding between the two sealing surfaces in contact between the valve plate and the valve seat, which can easily cause scratches under the use of medium force, thereby destroying the sealing performance and affecting the service life.
Structural type
According to the valve stem structure and movement mode, it is divided into open stem and rising stem. The valve stem of the rising stem drives the valve plate to rise and fall together. The internal transmission thread on the valve stem is outside the shell. Therefore, the opening, closing and position of the valve plate can be intuitively judged according to the movement direction and position of the valve stem. Moreover, the internal transmission thread is convenient for It is lubricated and not corroded by fluids, but it requires a large installation space. The internal transmission thread of the hidden stem is located inside the housing. During the opening and closing process, the valve stem only performs rotational movement, and the valve plate rises and falls within the housing. Therefore, the height dimension is small. Concealed stem valve gates are usually equipped with opening and closing position indicators above the upper cover to be used in environments with small space and high dust content such as ship trenches.
It can also be divided into wedge type and parallel type according to the structure of the valve plate.
Wedge valve plates can be divided into rigid single valve plates, elastic single valve plates and double valve plates.