According to the characteristics of the fluid flowing in the butterfly valve pipeline, when the fluid performs a steady laminar flow movement in the horizontal equal-diameter pipe, a cylindrical fluid section with a radius r is drawn in the pipe section with length l. Due to the pressure difference of the fluid in this section of pipe, the fluid itself has gravity and viscous resistance. The derivation shows that the fluid velocity uc is uc = $ P4Ll (r2w-r2). Due to the complexity of the turbulent motion, the velocity distribution formula in the tube has not been theoretically derived. The empirical formula can only be used to approximate the expression ucc = uz1-rw1n with m.s. Velocity and kinetic energy transmission are much greater than in laminar flow, so the velocity distribution is flattened and more uniform than in laminar flow. Near the pipe wall, the flow velocity close to the pipe wall is still zero due to the viscosity of the fluid, and it is still laminar in a thin layer with a local Reynolds number less than the critical value. This thin layer is called the laminar bottom layer The velocity gradient is larger than in laminar flow. Therefore, the velocity distribution in turbulent flow is flat in the middle compared with laminar flow, and steeper near the walls on both sides. After analysis, whether the fluid in the tube is in the laminar or turbulent state, the flow velocity in the center of the tube is high, and the flow velocity in the wall of the tube is low and tends to zero. For fluids containing solid particles, the scouring effect in the center of the tube is more serious and the scouring in the tube wall is less. If the seal ring is installed on the butterfly plate, the seal ring is located at the center of the tube and wears quickly, and the tube wall is worn slowly, causing uneven wear and affecting the sealing performance. Therefore, install the sealing ring on the valve seat. Because the flow velocity of the medium near the pipe wall is slow, the seal ring wear is small, and the flow velocity gradient at each point of the pipe wall is the same, even if the wear occurs, it is uniformly worn, and the impact on the seal is relatively small. To reduce fluid disturbance and reduce wear. The valve seat rises after gradual change, has a certain rectifying effect on the fluid, does not cause fluid disturbance, and relatively flushes the valve seat. Lift Top Coffee Table,White Coffee Table,Square Coffee Table,Modern Coffee Table Bosa Furniture Co.,Ltd. , https://www.bosafurniture.com