Multi-channel double-guide single-seat regulating valve

Abstract

The invention discloses a multi-channel double-guide single-seat regulating valve. A valve element of the regulating valve comprises a guide part and a sealing part connected to the end face of the top of the guide part. A sealing surface is arranged at the cooperation position of the sealing part and a valve seat. The guide part is of a multi-disc type structure, cross section contour lines of disc openings are in arc shapes, and longitudinal section contour lines of the disc openings are composed of transition parts with the top ends connected with the bottom end of the sealing surface, andarc parts connected to the bottom ends of the transition parts. A valve element hole is formed in the valve seat, a valve seat sealing surface is arranged in the valve element hole, the valve elementis located in the valve element hole of the valve seat, and the valve element sealing surface cooperates with the valve seat sealing surface. Under the diameter of the valve seat and the stroke of thevalve, compared with the prior art, the regulating valve has larger flow, and washing of fluid to the sealing surfaces can be avoided.

Description

technical field [0001] The invention belongs to the technical field of regulating valves, and relates to a multi-channel double-guiding single-seat regulating valve. Background technique [0002] In the field of industrial automation process control, the regulating valve is the final control element to change the process parameters such as medium flow, pressure, temperature and liquid level by means of power operation by receiving the control signal output by the regulating control unit, and the sealing performance of the regulating valve Good or bad directly affects the quality and economic benefits of the final product. One of the general regulating valve structures is a single-seat plunger structure (see figure 1 ), but this type of regulating valve has the following disadvantages. First, this type of regulating valve adjusts the size of the flow in the pipeline by changing the size of the existing annular area between the plunger valve core and the valve seat, so this ty...

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Problems solved by technology

[0002] In the field of industrial automation process control, the regulating valve is the final control element to change the process parameters such as medium flow, pressure, temperature and liquid level by means of power operation by receiving the control signal output by the regulating control unit, and the sealing performance of the regulating valve Good or bad directly affects the quality and economic benefits of the final product. One of the general regulating valve structures is a single-seat plunger structure (see figure 1 ), but this type of regulating valve has the following disadvantages. First, this type of regulating valve adjusts the size of the flow in the pipeline by changing the size of the existing annular area between the plunger valve core and the valve seat, so this type of regulating valve The structural limitation of the regulating valve cannot achieve a large flow capacity. The second reason is that the sealing surface of this type of regulating valve is just at the outlet of the fluid. At this time, the fluid flow rate is the highest and it is directly washed to the sealing surface. When the impurity or the pressure difference is relatively large, cavitation will occur, which will cause damage to the key sealing surface, and then affect the sealing performance. The third is that the reliability, high performance and stability of this kind of valve caliber are applied under the working condition of DN80. If the application caliber is larger than DN80 It is easy for the valve core to vibrate and rotate. The main reason is that the lower end of the valve core is not guided, and the valve core is subjected to a large impact force of the fluid. This invention is to further improve the conventional plunger-type regulating valve to solve the problem Common problems of control valves and improving the performance and reliability of such control valves

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