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When the gate valve is closed, the sealing surface can be sealed only by the medium pressure, that is, only by the medium
The pressure presses the sealing surface of the gate against the valve seat on the other side to ensure the sealing of the sealing surface, which is self-sealing. Most gate valves are forcibly sealed, that is, when the valve is closed, the gate is forced to be pressed against the valve seat by external force to ensure the tightness of the sealing surface.
Movement mode: The gate of the gate valve moves linearly with the valve stem, also known as a bright-stem gate valve. Usually, there is trapezoidal thread on the lifting rod. The nut is turned into linear motion through the nut on the top of the valve and the guide groove on the valve body, that is, the operating torque is changed to the operating thrust. When the valve is opened, when the lift height of the gate is equal to 1: 1 of the valve diameter, the fluid channel is completely clear, but this position cannot be monitored during operation. In actual use, the apex of the valve stem is used as a mark, that is, the position where it cannot be opened, as its fully open position. In order to consider the lock-up phenomenon caused by temperature change, it is usually opened to the top position, and then back to 1 / 2-1 circle as the position of the fully open valve. Therefore, the fully open position of the valve is determined according to the position of the gate (ie, stroke). Some gate valve stem nuts are located on the gate, and the handwheel rotates to drive the valve stem to rotate, and the gate is lifted. This kind of valve is called Rotary stem gate valve or called dark stem gate valve.
The gate valve is a gate of the opening and closing piece. The movement direction of the gate is perpendicular to the direction of the fluid. The gate valve is sealed by the contact between the valve seat and the gate. Usually, the sealing surface will be welded with metal materials to increase wear resistance, such as 1Cr13, STL6, stainless steel and so on. The gate has a rigid gate and an elastic gate. According to different gates, the gate valve is divided into a rigid gate valve and an elastic gate valve.