Year1
- 工作温度：
- ≤450 ℃
- 产品材质：
- CF8、CF8M
- 阀门标准：
- 国标
Product Features
Small flow resistance. The internal medium channel of the valve body is straight, the medium flows in a straight line, and the flow resistance is small.
It saves effort when opening and closing. It is compared with the stop valve, because whether it is open or closed, the movement direction of the gate is perpendicular to the direction of medium flow.
Large height, long opening and closing time. The opening and closing stroke of the gate is relatively large, and the lowering is carried out through the screw.
Water hammer is not easy to occur. The reason is the long shutdown time.
The medium can flow in any direction on both sides, making it easy to install. The gate valve passage is symmetrical on both sides.
The structural length (the distance between the two connecting end faces of the shell) is small.
The sealing surface is easy to wear and affects the service life. When opening and closing, the two sealing surfaces of the gate and the valve seat rub and slide against each other. Under the action of the medium pressure, scratches and wear are easy to occur, which affects the sealing performance and shortens the service life.
The price is more expensive. There are many contact sealing surfaces and the processing is complicated. Especially the sealing surface on the gate seat is difficult to process and has many parts.
The shape is simple, the structure is short, the manufacturing process is good, and the application range is wide.
The structure is compact, the valve has good rigidity, the channel is smooth, the flow resistance is small, the sealing surface is made of stainless steel and carbide, and the service life is long. It uses packing, reliable sealing, and light and flexible operation.
The point outer dimensions and opening height are large, requiring a large installation space. During the opening process, there is relative wear between the sealing surfaces, so the sealing surfaces are easily scratched. Gate valves generally have two The sealing surface makes processing, grinding and maintenance more difficult.
Operating Principle
The gate plate of the valve moves linearly with the valve stem. It is called a lift rod gate valve. There is usually a trapezoidal thread on the lift rod. Through the nut on the top of the valve and the guide groove on the valve body, the gate plate moves linearly with the valve stem. Transforming rotational motion into linear motion means changing operating torque into operating thrust. The sealing surface can be sealed only by the medium pressure, that is, by relying on the medium pressure to press the sealing surface of the gate plate to the valve seat on the other side to ensure the sealing surface sealing, this is self-sealing.
Some gate valves adopt forced sealing, that is, when the valve is closed, external force must be relied on to force the gate plate to the valve seat to ensure the sealing performance of the sealing surface
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