Internal thread gate valve, also known as cut-off valve, is a widely used valve. Its popularity is due to the low friction between sealing surfaces during the opening and closing process, its durability, small opening height, easy manufacturing, and convenient maintenance. It is not only suitable for medium and low pressure, but also for high pressure. Its closing principle is to rely on the pressure of the valve stem to tightly fit the sealing surface of the valve disc and the sealing surface of the valve seat, preventing the flow of medium. The hand wheel and handle operated tube stop valve can be installed at any position in the pipeline. Handwheels, handles, and lifting mechanisms are not allowed for lifting purposes. The flow direction of the medium should be consistent with the arrow direction shown on the valve body.

Internal threaded gate valves allow only unidirectional flow of media and have directional installation. Its structural length is larger than that of the gate valve, and at the same time, the fluid resistance is high, which results in poor sealing reliability during long-term operation. Thread gate valves are divided into internal thread valves and external thread valves. Mainly refers to the valve body with internal or external threads connected to pipeline threads. Threaded valves, also known as threaded valves, threaded valves, and internal threaded valves.

A gate valve is a gate with an opening and closing element. The direction of movement of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully open and fully closed, and cannot be adjusted or throttled. Gate valves are sealed by the contact between the valve seat and the gate plate. Usually, the sealing surface is welded with metal materials to increase wear resistance, such as 1Cr13, STL6, stainless steel, etc. There are rigid and elastic gate valves, and gate valves are divided into rigid gate valves and elastic gate valves according to the different types of gates.