Introduction To Stainless Steel Knife Type Gate Valve

The opening and closing parts of Lined Gate Valve are gates, and the movement direction of the gate is perpendicular to the direction of the fluid. Stainless steel knife-type gate valves can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate has two sealing surfaces. The two sealing surfaces of the most commonly used mode gate valve form a wedge shape. The wedge angle varies with the valve parameters, usually 50. The gate of the wedge-type knife-type gate valve can be made into a whole, called a rigid 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. This gate is called an elastic gate. When the knife-type gate valve is closed, the sealing surface can only rely on the medium pressure to seal, that is, the sealing surface of the gate is pressed against the valve seat on the other side by the medium pressure to ensure the sealing of the sealing surface. This is self-sealing. Most knife-type gate valves use forced sealing, that is, when the valve is closed, the gate must be forced to press against the valve seat by external force to ensure the sealing of the sealing surface.

Stainless steel knife-type gate valve

1. Ultra-short structural length, saving materials, can greatly reduce the overall weight of the pipeline system.

Applicable media for stainless steel knife-type gate valves

As the name implies, knife-type gate valves have knife-shaped oblique cuts at the bottom of the flat valve plate, which have the function of cutting off the medium, so that the valve is closed without being blocked by the medium. This valve is generally used for the circulation and opening and closing of media such as pulp, coal ash, chemical raw materials, sewage, and food. The pressure range is generally used within 1.6MPa, and the temperature is generally used below 120℃. High temperature can also be replaced by special materials. According to the sealing performance requirements, it can be divided into soft seals and hard seals. Soft seals can achieve 0 leakage, and hard seals are tested according to different leakage levels.

The valve is easy to operate, open freely, and move flexibly and reliably; the valve disc is easy to assemble and maintain, the sealing structure is reasonable, and the sealing ring is convenient and practical to replace.
2. It occupies a small effective space, can effectively support the strength of the pipeline, and can reduce the possibility of pipeline vibration.

3. The gate is made of austenitic stainless steel, which greatly improves the corrosion resistance and can effectively prevent the seal leakage caused by gate corrosion.

4. The upper sealing packing adopts flexible PTFE, which has reliable sealing performance and light and flexible operation.

5. The gate has the function of a gate knife and can effectively cut off all kinds of debris in the medium.