Investigation of the Processes of Formation of Cavitation Bubbles in a New Axial Control Valve Design Featuring a Rotary
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INVESTIGATION OF THE PROCESSES OF FORMATION OF CAVITATION BUBBLES IN A NEW AXIAL CONTROL VALVE DESIGN FEATURING A ROTARY LOCKING DEVICE A. E. Lebedev,1 A. B. Kapranova,1 A. A. Vatagin,1 and A. M. Melzer2
UDC 62-396
The article presents a mathematical description of the formation process of cavitation bubbles in a new design of axial control valve fitted with a rotary locking device. The differential distribution function of the number of cavitation bubbles by size is obtained for use in calculating the main valve parameters. Keywords: cavitation, shutoff valves, valve, liquid, resistance.
Due to the presence of two mutually contradictory requirements for controlling for controlling the flow rate and pressure of fluid media in industrial pipelines, axial control valves are among the most effective devices for ensuring minimal hydraulic resistance when the valve is open and increased hydraulic resistance for performing the regulation function [1, 2]. Despite the availability of many design solutions for axial control valves, which are manufactured by a number of companies both in Russia and abroad, the issue of cavitation arising during valve operation, which causes vibration, noise, and (most significantly) the destruction of the valve structure, has yet to be fully resolved [3]. In order to reduce the harmful effects of cavitation, new axial valve design for controlling the flow rate of fluid media is proposed. To prevent changes in the direction and structure of internal flows, the locking device of the proposed valve moves only in the circumferential direction, ensuring a decrease in the cavitation intensity and actuator load [4]. In addition, this method for changing the flow area of apertures in the valve separator helps to increase the hydraulic resistance in the valve closing phases (by simultaneously changing the shape of the apertures), as well as maintaining tightness. The control valve includes (Fig. 1) the outer casing 14 and the inner casing 2. The inlet flange 1 and the outlet flange 8 are attached to the outer casing 14. Inside the valve body is located a flow divider comprising a perforated cylinder 11 to which a locking element 10 is installed coaxially. On the surface of the perforated cylinder 11 and the locking device 10, there are apertures 9 and 6, respectively. Via the rod 12, the locking device 10 is connected to the actuator 13. An expansion bushing 7 is installed in the outlet flange 8 to provide access to the internal elements of the valve. To reduce losses in the drive, the rotating element of the valve is installed in bearing 3 and in the area of the outlet flange in a cylindrical protrusion made in the expansion sleeve 7. The locking device is rotated by the meshing gear rims 4 and 5. The control valve operates as follows. Fluid enters the space between the outer casing 14 and inner casing 2 through the inlet flange 1. Then the fluid through the apertures 9 and 6 enters the perforated cylinder 11, from which it flows to the locking device 10 and then into the pipeline through the outle
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