Now the demand for flat gate valves is increasing, and more and more projects are using it to replace ball valves. We all know that it is used in oil and natural gas pipelines, so what characteristics does it have that increase its value? Woolen cloth
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 a short tube. The flat gate valve with diversion hole is installed on the pipeline, and the pig can be used for pigging directly. Since the gate plate slides on the two valve seat surfaces, the flat gate valve fluid can be applied to the medium 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 in a cold state, thermal elongation of the valve stem will not overload the sealing surfaces. The length of the structure is much shorter than that of the ball valve, and the opening is easier. The light-duty flat gate valve is more compact, but the effect is exactly the same.
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 the 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-port and is tightly guided with the gate.