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What are the functions of gate valves

Posted by Bundor valve
This article will introduce the function of gate valve to you, and then help you to understand the purpose of gate valve. The gate valve is a very important control part in the pipeline conveying fluid medium. The structure of gate valve is composed of valve body, bonnet, stem, ram, sealing ring and driving device. The driving device is usually a hand wheel. In addition, it can also be equipped with pneumatic or electric actuators.
The gate of the gate valve is a disc shape, which is driven by the stem to open and close the valve. The movement direction of the valve rod and the gate is perpendicular to the valve body channel and the flow direction of the fluid in the pipeline. Gate valve only has two states of full open and full close, so it can only be used to cut off the flow of medium in the pipeline, and cannot be used to regulate the flow. In addition, when the gate valve is opening or closing, the stroke distance of the gate valve is long. Although it is labor-saving to open and close, but it takes a lot of time. Therefore, the gate valve is very suitable to be used in the pipeline without frequent opening and closing, to cut off or connect the flow medium in the pipeline
The gate valve has two sealing surfaces. When the gate valve is closed, it can only rely on the medium pressure to press the sealing surface of the gate valve to the valve seat on the other side to achieve sealing, that is, self sealing. Most gate valves are forced to seal, that is, when the valve is closed, it needs to rely on the external force of the medium to force the gate against the valve seat to ensure the sealing of the sealing surface.
Gate valve can be divided into rising stem gate valve and non-rising stem gate valve according to the structural form. The function of the two structural forms of gate valve is not different, but more different is the use environment.
 gate valve,gate valves
1. The stem of the rising stem gate valve is exposed. When the valve is opening and closing, the state can be observed intuitively to avoid misoperation. And because the stem is exposed, the original height of the rising stem gate valve is higher. Therefore, the rising stem gate valve is suitable to be used in places where a large operating space is required, and not suitable in the case of narrow space.
2. The stem of the non-rising stem gate valve is inside the valve body, so the on-off state of the valve cannot be directly observed, and additional indicating device is required. However, because the valve stem is in the valve body, the volume of the non-rising stem gate valve is smaller than the rising stem gate valve, which is more suitable for the occasions with small operation space and limited location and dense pipeline.
When the gate valve is fully opened, the medium flows through the inner passage of the valve body without any obstruction, and the flow resistance is almost zero. In addition, the two sides of the gate valve body channel are symmetrical, and the medium can flow in two directions, so the installation is not affected by the flow direction of the medium. Gate valve has a wide range of applications due to its good manufacturing process. Gate valve is widely used in water conservancy system, water supply and drainage system, petroleum, chemical industry, electric power, urban construction, fire protection and other industries.