Fluorine-lined gate valve structure and working principle

When the fluorine-lined gate valve is closed, the sealing surface can be sealed only by the medium pressure, that is, the sealing surface of the gate plate is pressed to the valve seat on the other side by the medium pressure to ensure the sealing of the sealing surface, which is self-sealing. Most gate valves are forced to seal, that is, when the valve is closed, the gate must be forced against the valve seat by external force to ensure the tightness of the sealing surface. Turn the handwheel of the fluorine-lined gate valve, and 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 lowered to achieve the function of opening and closing. The opening and closing part of the fluorine-lined gate valve is the gate, and the movement direction of the gate is perpendicular to the direction of the fluid. The gate valve 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 commonly used gate valve form a wedge. The wedge angle varies with the valve parameters, usually 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 produce a small amount of deformation to improve its manufacturability and make up for the deviation of the sealing surface angle during processing. The plate is called an elastic gate. The opening and closing part of the fluorine-lined gate valve is the gate. The movement direction of the gate is perpendicular to the direction of the fluid. The gate valve 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 commonly used gate valve form a wedge. The wedge angle varies with the valve parameters, usually 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 produce a small amount of deformation to improve its craftsmanship and make up for the deviation of the sealing surface angle during processing. The plate is called an elastic gate. Structural characteristics of fluorine-lined gate valve: For a long time, the general gate valve used in the market has generally suffered from water leakage or rust. rust and other defects, the elastic seat gate valve uses the compensation effect of the elastic gate to produce a small amount of elastic deformation to achieve a good sealing effect. The valve has significant advantages such as light switch, reliable sealing, good elastic memory and service life. It can be widely used in tap water, sewage, construction, petroleum, chemical industry, food, medicine, textile, electric power, shipbuilding, metallurgy, energy system and other pipelines as regulation and interception devices. The types of fluorine-lined gate valves can be divided into wedge gate type gate valve and parallel gate gate valve according to the configuration of sealing surface; wedge gate gate valve can be divided into: single gate type, double gate type and elastic gate type; parallel gate type gate valve It can be divided into single gate 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 are forced to seal, that is, when the valve is closed, the gate must be forced to the valve seat by 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). Usually, there is a trapezoidal thread on the lift rod. 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 lift height of the gate is equal to 1:1 times the diameter of the valve, the fluid channel is completely unobstructed, but this position cannot be monitored during operation. In actual use, the apex of the valve stem is used as a sign, 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 to 1/2-1 turn, 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, the stroke). For some gate valves, the valve stem nut is set on the gate, and the rotation of the handwheel drives the valve stem to rotate, and the gate is lifted. This kind of valve It is called rotary stem gate valve or dark stem gate valve.
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