Disc Profile Line Structure and Design Method of a Spherical Control Valve
A design method and technology of regulating valves, which are applied in the field of regulating valves, can solve the problems that need to be improved, and achieve the effects of reducing weight, reducing lifting force, and reducing unstable swirling flow
Active Publication Date: 2018-05-22
DONGFANG TURBINE CO LTD
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Problems solved by technology
However, at present, the industry's understanding of the vibration mechanism of the spherical control valve disc needs to be improved.
Method used
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Embodiment Construction
[0024] see figure 2 As shown, the present invention is a profile structure of a valve disc body of a spherical regulating valve, including a valve disc body 1, which has a spherical sealing surface, and has a valve seat body 2 on the spherical sealing surface of the valve disc body 1. With the matching point 12 for sealing, the spherical sealing surface of the valve disc body 1 cooperates and seals with the matching point 22 on the arc-shaped sealing surface of the valve seat body 2 through the matching point 12 thereon. In order to reduce the unstable swirl flow generated by the fluid at the bottom of the spherical sealing surface of the valve disc body 1 during operation, the lower part below the matching point 12 on the spherical sealing surface of the valve disc body 1 is a planar structure, that is, the spherical seal of the valve disc body 1 The bottom of the surface is a flat-bottomed structure.
[0025] Specifically, the outline profile of the spherical sealing surfa...
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The invention discloses a disc profile line structure of a spherical regulating valve and a design method thereof. The valve disc shape line structure includes the valve disc body, the spherical sealing surface of the valve disc body has a matching point that cooperates and seals with the valve seat body, and the lower part of the sealing surface below the matching point is a planar structure. The design method includes: 1. Determine the design parameters, draw a curve with a radius of RD as the basic contour line of the spherical sealing surface of the valve disc body; 2. Determine the sealing fit points on both sides of the basic contour line; 3. Use The matching point determined on both sides of the basic contour line is the starting point, and an extension line tangent to it is drawn on the basic contour line below the matching point; 4. Use a straight line to connect the bottom of the extension line drawn on both sides The ends are connected, and the redundant line segments are removed, so that the contour line of the spherical sealing surface of the designed valve disc body is mainly composed of the arc segment line, the extension segment line and the straight line segment line from top to bottom.
Description
technical field [0001] The invention relates to a control valve, in particular to a valve disc profile structure of a spherical control valve and a design method for the valve disc profile structure. Background technique [0002] The regulating valve is arranged on the fluid passage, mainly composed of an actuator and a valve, which changes the fluid flow in the fluid passage by receiving the signal output by the regulating control unit and by means of power operation. It can be seen that the regulating valve has a great influence on the working performance and safety of the fluid system. Stable operation plays a vital role, especially in steam turbines with high temperature and high pressure fluids. [0003] The regulating valve on the steam turbine is not only the first station of the flow part, but also the executive part of the control system, and is one of the core equipment of the steam turbine unit. The control valve commonly used in steam turbines is a spherical con...
Claims
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IPC IPC(8): F16K1/36
CPCF16K1/36
Inventor 钟主海江生科范小平
Owner DONGFANG TURBINE CO LTD