The opening and closing member of the gate valve is a gate. The direction of movement of the gate is perpendicular to the direction of the fluid. The cast iron gate valve can only be fully open and fully closed, and cannot be adjusted and throttled. The gate has two sealing faces. The two sealing faces of the most common mode gate valves form wedge-shaped, wedge-shaped angle valves.
The gate of the wedge gate valve can be made into a whole, called a steel gate; it can also be made into a gate that can produce a slight deformation to improve its processability and compensate for the deviation of the sealing surface angle during the processing. The shutter is called a resilient shutter.
1. The flow resistance is small. The inner medium passage of the valve body is straight through, the medium flows in a straight line, and the flow resistance is small.
2. It is more labor-saving when opening and closing. Compared with the shut-off valve, the direction of movement of the ram is perpendicular to the direction of flow of the medium, whether it is open or closed.
3, high height, long opening and closing time. The opening and closing stroke of the shutter is large, and the drop is performed by the screw.
4. The water hammer phenomenon is not easy to produce. The reason is that the shutdown time is long.
5. The medium can flow in any direction on both sides, which is easy to install. The gate valve channels are symmetrical on both sides.
6. The length of the structure (the distance between the two connecting end faces of the casing) is small.
7. The sealing surface is easy to wear and affect the service life. When opening and closing, the two sealing surfaces of the gate and the valve seat rub against each other, and it is easy to cause abrasion and abrasion under the action of the medium pressure, which affects the sealing performance and shortens the service life.
8, the price is more expensive. There are many contact sealing surfaces, and the processing is complicated. In particular, the sealing surface on the gate seat is not easy to process, and there are many parts.
9. Simple shape, short structure length, good manufacturing process and wide application range.
10. Compact structure, good rigidity of the valve, smooth passage, small flow resistance, stainless steel and hard alloy on the sealing surface, long service life, ptfe packing, reliable sealing, light and flexible operation.