The fluorine-lined gate valve
tells you what is the fluorine-lined gate valve. The fluorine-lined gate valve is a kind of valve. The opening and closing part of the fluorine-lined gate valve is the gate, and the movement direction of the gate is straight with the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or saved. The gate has two sealing surfaces. The two sealing surfaces of the most commonly used gate valve form a wedge shape. The wedge angle varies with the valve parameters, generally 50, and 2°52' when the medium temperature is not high. The gate of the wedge gate valve can be made into a whole, called a rigid gate; it can also be made into a gate that can deform slightly to improve its manufacturability and compensate for the errors that occur during the processing of the sealing surface viewpoint. The plate is called an elastic gate. According to the sealing surface equipment, it can be divided into wedge gate type gate valve and parallel gate gate valve; wedge gate gate valve can be divided into: single gate type, double gate type and elastic gate type; parallel gate gate valve can be divided into single gate type Plate type and double gate type. According to the thread position of the valve stem, it can be divided into two types: open stem gate valve and dark stem gate valve. When the fluorine-lined gate valve is closed, the sealing surface can be sealed only by the medium pressure, that is, relying 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, which is self-sealing. Most gate valves use forced sealing, that is, when the valve is closed, the gate should be pressed against the valve seat by strong external force to ensure the tightness of the sealing surface. The gate of the fluorine-lined gate valve moves linearly with the valve stem, which is called a lift-rod gate valve (also called an open-rod gate valve). Generally, there is a trapezoidal thread on the lift rod, and through the nut at the top of the valve and the guide groove on the valve body, the rotary motion is changed into a linear motion, that is, the operating torque is changed into an operating thrust. When the valve is opened, when the height of the gate is equal to 1:1 times the diameter of the valve, the fluid channel is completely unclogged, but this position cannot be monitored during operation. In actual use, the pole of the valve stem is used as the mark, that is, the position where it cannot be opened, as its full opening position. In order to consider the temperature change showing a locked appearance, generally open to the extreme position, and then rewind 1/2-1 turn, as the position of the fully open valve. Therefore, the full opening position of the valve is determined according to the position (ie stroke) of the gate. In some gate valves, the valve stem nut is set on the gate, and the handwheel changes to move the valve stem to move the gate to elevate. The valve is called a rotary stem gate valve or a dark stem gate valve. By changing the handwheel, through the advance and retreat of the thread of the handwheel and the valve stem, the valve plate connected with the valve stem is lifted or dropped, and the effect of opening and closing is achieved. According to the sealing surface equipment, it can be divided into wedge gate type gate valve and parallel gate gate valve. Wedge gate gate valve can be divided into: single gate type, double gate type and elastic gate type; parallel gate type gate valve can be divided into single gate type Plate type and double gate type. According to the thread position of the valve stem, it can be divided into two types: open stem gate valve and dark stem gate valve. The installation and protection of fluorine-lined gate valve should pay attention to the following matters: Handwheel, handle and transmission mechanism are not allowed to operate It is used for lifting and bumping is prohibited. The double-gate gate valve should be installed straight (that is, the valve stem is in a straight position, and the handwheel is at the top). The gate valve with a bypass valve should be opened before opening the bypass valve (to balance the inlet and outlet). pressure difference and reduce the opening force). The gate valve with the transmission mechanism should be installed according to the specifications of the product instruction manual. If the valve is frequently used, it should be smoothed at least once a month.
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