Product Introduction
A gate valve is an opening and closing component that moves perpendicular to the fluid direction. It can only be fully opened and fully closed, and cannot be adjusted or throttled. Gate valves are sealed by the contact between the valve seat and the gate plate, and the sealing surface is usually welded with metal materials to increase wear resistance, such as 1Cr13, STL6, stainless steel, etc. There are rigid gate valves and elastic gate valves. According to the different gate valves, gate valves are divided into rigid gate valves and elastic gate valves.

Working principle
The opening and closing component of a gate valve is the gate plate, and the direction of movement of the gate plate 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 valve has two sealing surfaces, and the two sealing surfaces of the commonly used mode gate valve form a wedge shape. The wedge angle varies with the valve parameters, usually 5 °, and 2 ° 52 'when the medium temperature is not high. The gate of a wedge gate valve can be made as a whole, called a rigid gate; It can also be made into a gate that can produce slight deformation to improve its processability and compensate for the deviation of the sealing surface angle during the processing. This type of gate is called an elastic gate. When the gate valve is closed, the sealing surface can be sealed solely by the medium pressure, that is, the sealing surface of the gate is pressed against the valve seat on the other side by the medium pressure to ensure the sealing surface is sealed, which is called self sealing. Most gate valves use forced sealing, which means that when the valve is closed, external force must be used to forcefully press the gate plate against the valve seat to ensure the sealing performance of the sealing surface. The gate of a gate valve moves in a straight line with the valve stem, which is called a rising stem gate valve or a rising stem gate valve. Usually, there are trapezoidal threads on the lifting rod, which convert rotational motion into linear motion through the nut at the top of the valve and the guide groove on the valve body, that is, convert operating torque into operating thrust. When the valve is opened, when the lifting height of the gate is equal to 1:1 times the valve diameter, the fluid channel is completely unobstructed, but this position cannot be monitored during operation. In actual use, the vertex of the valve stem is used as a marker, that is, the position where it cannot be opened, as its fully open position. To consider the phenomenon of locking due to temperature changes, it is usually done by opening the valve to the top position and then reversing it by 1/2-1 turn as the position for fully opening the valve. Therefore, the fully open position of the valve is determined by the position of the gate and the stroke. Some gate valves have the stem nut set on the gate plate, and the handwheel rotates to drive the stem to rotate, thereby lifting the gate plate. This type of valve is called a rotary stem gate valve or a concealed stem gate valve.

Sports Style
When the gate valve is closed, the sealing surface can be sealed solely by the pressure of the medium, that is, the sealing surface of the gate valve is pressed against the valve seat on the other side by the pressure of the medium, which is called self sealing. Most gate valves use forced sealing, which means that when the valve is closed, external force must be used to forcefully press the gate plate against the valve seat to ensure the sealing performance of the sealing surface.

Movement mode: The gate of a gate valve moves in a straight line with the valve stem, also known as a rising stem gate valve. Usually, there are trapezoidal threads on the lifting rod, which convert rotational motion into linear motion through the nut at the top of the valve and the guide groove on the valve body, that is, convert operating torque into operating thrust. When the valve is opened, when the lifting height of the gate is equal to 1:1 times the valve diameter, the fluid channel is completely unobstructed, but this position cannot be monitored during operation. In actual use, the vertex of the valve stem is used as a marker, that is, the position where it cannot be opened, as its fully open position. To consider the phenomenon of locking due to temperature changes, it is usually done by opening the valve to the top position and then reversing it by 1/2-1 turn as the position for fully opening the valve. Therefore, the fully open position of the valve is determined by the position of the gate (i.e. stroke). Some gate valves have valve stem nuts set on the gate, and the handwheel rotates to drive the valve stem to rotate, thereby lifting the gate. This type of valve is called a rotary stem gate valve or a concealed stem gate valve.

advantage
1. Low flow resistance. The internal medium channel of the valve body is straight through, and the medium flows in a straight line with low flow resistance.
2. It is more effortless to open and close. Compared to globe valves, the direction of gate movement is perpendicular to the direction of medium flow, whether it is open or closed.
3. High height, long opening and closing time. The opening and closing stroke of the gate is relatively large, and the lifting is carried out through screws.
4. Water hammer phenomenon is not easy to occur. The reason is that the shutdown time is long.
5. The medium can flow in any direction on both sides, making it easy to install. The two sides of the gate valve channel are symmetrical.
6. The structural length (the distance between the two connecting end faces of the shell) is relatively small.
7. Simple form, short structural length, good manufacturing processability, and wide applicability.
8. Compact structure, good valve rigidity, smooth channel, low flow resistance, sealing surface made of stainless steel and hard alloy, long service life, PTFE packing, reliable sealing, easy and flexible operation.

precautions
1. Handwheels, handles, and transmission mechanisms are not allowed to be used for lifting and collisions are strictly prohibited.
2. Double gate valves should be installed vertically (i.e. with the valve stem in a vertical position and the handwheel at the top).
3. Before opening a gate valve with a bypass valve, the bypass valve should be opened first (to balance the pressure difference between the inlet and outlet and reduce the opening force).
4. Install the gate valve with transmission mechanism according to the instructions in the product manual.
5. If the valve is frequently opened and closed, lubricate it at least once a month.
6. Gate valves are only used for fully opening and fully closing various pipelines or equipment for the operation of media, and are not allowed to be used for throttling.
7. Gate valves with handwheels or handles should not be operated with additional auxiliary bars (if the seal is not tight, the sealing surface or other parts should be inspected and repaired). Rotate the handwheel and handle clockwise to close, and vice versa to open. Gate valves with transmission mechanisms should be used according to the instructions in the product manual.