Types and Applications of Gate Valves
Types and Applications of Gate Valves
The main gate valves product names of China gate Valve Network include:Fire Special Rising Stem Resilient Seat Seal Gate Valve,Forged Steel Socket Welding Valve,Forged Steel Flange Gate Valve,GB Bellows Wedge Gate Valve,High Temperature & pressure Power Station Gate Valve,Inside Screw Non-rising Stem Wedge Gate Valve,Insulation Jacket Gate Valve,Lined Gate Valve,MZ44W Rising Stem Gas Quick Open&close ParallelMZ48W Manual Non-rising Stem City Gas Quick Gate Valve
There are many types of gate valves, which can be divided according to the structure of the gate plate: 1) Parallel gate valve: a gate valve whose sealing surface is parallel to the vertical centerline, that is, two sealing surfaces are parallel to each other. 2) Wedge gate valve: The sealing surface forms a certain angle with the vertical centerline, that is, the two sealing surfaces form a wedge shape. In wedge gate valves, there are single gate valves, double gate valves, and elastic gate valves. Gate valves have a simple structure and are reliable to use, but they require high precision for the sealing surface angle, making processing and maintenance difficult. There is a high possibility of wedging when the temperature changes. Double gate wedge gate valves are commonly used in water and steam medium pipelines. Its advantages are: lower precision requirements for the sealing surface angle, less risk of wedging caused by temperature changes, and the ability to compensate with gaskets when the sealing surface wears out. But this type of structural component has many parts and is prone to sticking in viscous media, affecting sealing. More importantly, the upper and lower baffles are prone to rust and the gate is prone to detachment after long-term use. 3) Elastic seat sealing gate valve, which has the advantages of simple structure and reliable use of single gate wedge gate valve, can also produce trace elastic deformation to compensate for the deviation of sealing surface angle during processing, improve processability, and has been widely adopted.
Gate valves can be divided into: 1) Rising stem gate valves: The stem nut is on the valve cover or bracket, and when opening and closing the gate, the stem nut is rotated to achieve the lifting and lowering of the stem. This structure is beneficial for the lubrication of the valve stem and has a clear degree of opening and closing, so it is widely used. 2) Hidden stem gate valve: The valve stem nut is located inside the valve body and comes into direct contact with the medium. When opening and closing the gate, use a rotating valve stem to achieve this. The advantage of this structure is that the height of the gate valve remains constant, so the installation space is small, making it suitable for gate valves with large diameters or limited installation space. This structure should be equipped with an opening and closing indicator to indicate the degree of opening and closing. The disadvantage of this structure is that the valve stem thread not only cannot be lubricated, but also directly accepts the erosion of the medium, which is easy to damage.
The main application scope of gate valves is: 1. Oil and natural gas transmission pipelines. Flat gate valves with diversion holes are also convenient for cleaning pipelines. 2. Transportation pipelines and storage equipment for refined oil products. 3. The wellhead equipment for oil and natural gas extraction, also known as valves for Christmas trees. 4. A pipeline containing suspended particles. 5. Urban gas transmission pipeline. 6. Water supply project.
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