Valve Buffer Structure for Reducing Vibration and Noise of Valve Opening and Closing

The valve is controlled by the combination of valve body and disc. When the valve is closed, the pressure difference at the inlet and outlet ends is different. At the moment when the valve is opened, the existence of pressure difference will cause a huge instantaneous impact on the valve components and pipelines when the medium passes through the valve, resulting in valve vibration and noise. Vibration has an impact on the sealing performance, service life and other testing equipment of valves and pipelines connected to them. Under some specific high-pressure conditions, especially the valves used in high-pressure pipeline system, their vibration is particularly severe, which can not meet the requirements of smooth operation, small vibration amplitude and low noise.

The door buffer structure is composed of two symmetrical bypass holes (not limited to two) and a central through hole which is connected with the valve body. A sealing seat is arranged in the central through hole section from the end face of the valve seal to the bypass hole, and a sealing valve is arranged on the sealing seat to form a sealing component. When the sealing component is in the closed state, the bypass hole is not connected with the central through hole at the lower part. When the sealing component is in the open state, the bypass hole is connected with the central through hole at the lower part, and the inlet and outlet of the valve are connected. The sealing valve is connected with one end of the transmission rod, and the other end of the transmission rod is connected with the driving mechanism outside the central through hole. The height of the limit groove is the distance of the sealing disc moving in the central through hole of the valve disc. The central through hole of the lower part of the valve disc should be connected with the bypass hole after the sealing assembly is opened.

When the valve is opened, driven by the driving mechanism, the transmission rod rises and the sealing valve connected with it rises. At this time, the valve disc does not move. The sealing assembly is opened first. The medium will enter the valve from the inlet end to the outlet end through the central through hole and the by-pass hole, and balance the pressure at the inlet and outlet end of the valve through a small amount of inflow medium. As the transmission rod continues to rise, under the restriction of the limit mechanism, the sealing disc and the valve disc move up simultaneously, and the valve opens. Conversely, the transmission rod moves downward, closing the sealing assembly first, and the valve closes as the transmission rod continues to move downward.