A flat gate valve
is a sliding valve whose closure is a parallel gate. Its closure can be a single gate or a double gate with a spreading mechanism in between. The pressing force of the gate to the valve seat is controlled by the medium pressure acting on the floating gate or floating valve seat. If it is a double gate flat gate valve, the opening mechanism of the two gates can increase the pressing force. The advantage of the flat gate valve is that the flow resistance is small, and its flow resistance without shrinkage is similar to that of the short tube. The flat gate valve with diversion hole is installed on the pipeline, and the pig can be used for pigging directly. Because the gate slides on the two valve seat surfaces, the flat gate valve fluid can be used for media with suspended particles, and the sealing surface of the flat gate valve is actually automatically positioned. The seat sealing surface will not be damaged by thermal deformation of the valve body. And even if the valve is closed cold, thermal elongation of the valve stem will not overload the sealing surfaces. At the same time, when the valve is closed, the flat gate valve without diversion hole does not require high precision of the closing position of the gate, so the electric flat gate valve can use the stroke to control the opening and closing position. The disadvantage of the flat gate valve is that when the medium pressure is low, the sealing force of the metal sealing surface is not enough to achieve a satisfactory seal. On the contrary, when the medium pressure is high, if the sealing surface is not lubricated by system medium or external medium, frequent opening and closing may cause excessive wear of the sealing surface. Another disadvantage is that the circular gate, which moves laterally on the circular flow passage, is only sensitive to flow control when it is at 50% of the valve's closed position. Moreover, the gate will vibrate violently when the high-speed and high-density medium flow is interrupted. It can also be used as a throttling if the valve seat is made into a V-shaped port and is closely guided with the gate. 1. Application of flat gate valve 1. Oil and natural gas pipelines. The flat gate valve with diversion hole also facilitates the cleaning of the pipeline. 2. Pipelines and storage equipment for refined oil products. 3. Oil and natural gas extraction wellhead devices, that is, valves for Christmas trees. 4. Pipes for media with suspended particles. 5. City gas pipeline. 6. Water works. 2. Selection principle of flat gate valve Back to top 1. For oil and natural gas transmission pipelines, choose a flat gate valve with single gate or double gate. If it is necessary to clean the pipeline, choose a single gate or double gate open-rod flat gate valve with diversion holes. 2. For the pipelines and storage equipment of refined oil, choose the flat gate valve with single gate or double gate without diversion hole. 3. For oil and natural gas extraction wellhead devices, single gate or double gate flat gate valves with concealed stem floating seat and diversion hole are selected, most of which are API16A standard, and the pressure grades are API2000, API3000, API5000, API10000, API15000 , API20000. 4. For pipelines with suspended particle medium, use knife-type flat gate valve. 5. For city gas transmission pipeline, choose single gate or double gate soft-sealed rising stem flat gate valve. 6. For urban tap water projects, use single gate or double gate open-rod flat gate valve without diversion hole.
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