The sealing surface in the gate valve
of the electric gate valve moves relative to the vertical direction of the gas flow path to achieve air flow sealing. Its structure is similar to the gate of a reservoir, so it is called a gate valve (Figure 1). Since the sealing surface is flat, in order to withstand atmospheric pressure, the overall structure is relatively thick and bulky. The sliding part inside the gate valve is linearly driven in ultra-high vacuum through a welded bellows, and the seal is mostly fluorine rubber ring. For the sealing of the gate valve body, considering high temperature baking, metal (In) wire is used for sealing. The schematic diagram of the structure diagram of the electric gate valve Considering the pressure difference between the two sides of the gate valve, the installation of the gate valve is directional, that is, the sealing surface should face the higher vacuum side. Regular gate valves usually have a triangle mark on the higher vacuum surface. For the connection of the vacuum chamber, or the connection between the chamber and the exhaust pump (molecular pump, ion pump), gate valves are often used. The working principle of the electric gate valve: when the electric gate valve is closed: the sealing surface of the electric gate valve can only rely on the medium pressure to seal, that is, rely on the medium pressure to press the sealing surface of the gate to the valve seat on the other side to ensure the sealing of the sealing surface. seal. Most gate valves adopt forced sealing, that is, when the valve is closed, the gate must be forced against the seat by external force to ensure the sealing performance of the sealing surface. The gate of the gate valve moves linearly with the valve stem, which is called the lifting stem gate valve (also called the rising stem gate valve). Usually there is a trapezoidal thread on the lifting rod, through the nut on the top of the valve and the guide groove on the valve body, the rotary motion is changed into linear motion, that is, the operating torque is changed into operating thrust. When the electric gate valve is open: When the lifting height of the electric gate valve gate plate is equal to 1:1 times the valve diameter, the fluid passage is completely unblocked, 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 take into account the lock-up phenomenon caused by temperature changes, it is usually opened to the top position, and then back 1/2-1 circle, as the position of the fully open gate valve. Therefore, the fully open position of the valve is determined by the position of the gate (that is, stroke). In some gate valves, the stem nut is set on the gate, and the rotation of the handwheel drives the rotation of the valve stem to lift the gate. This kind of valve is called Rotating stem gate valve or dark stem gate valve.
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