High-pressure-difference regulating valve

Abstract

The invention relates to the technical field of valves, and particularly discloses a high-pressure-difference regulating valve. The high-pressure-difference regulating valve comprises a valve body, avalve seat arranged in the valve body, a valve element, a valve rod and a throttling assembly, wherein the throttling assembly comprises a throttling seat and a plurality of layers of throttling plates stacked below the throttling seat; the throttling seat is provided with a plurality of first pressure reduction holes; each throttling plate is provided with a plurality of second pressure reductionholes and a plurality of flow guide grooves; the number of the first pressure reduction holes and the number of the second pressure reduction holes are sequentially decreased progressively from top to bottom in a stepped manner; the lengths of the flow guide grooves in the throttling plates are sequentially increased from top to bottom in the radial direction of the throttling plates; and the number of the flow guide grooves is sequentially decreased progressively from top to bottom in a stepped manner. According to the high-pressure-difference regulating valve, the novel multi-stage pressurereduction stepped pressure reduction holes are designed, and the high-pressure-difference pressure reduction function is achieved while the circulation hole diameter is increased so as to resist blockage; and due to the design of a filter screen, impurities entering throttling inner pieces are reduced, cleaning and maintaining are convenient, the blockage resisting capability of the valve is further improved, and the performance reliability of the valve is improved.

Description

technical field [0001] The invention belongs to the technical field of valves, in particular to a high pressure difference regulating valve. Background technique [0002] With the rapid development of the national power industry, the contradiction of excessive energy consumption has become increasingly prominent. In order to minimize the consumption of non-renewable resource-coal, the installed capacity of thermal power generators in China has been developed from 300MW, 600MW subcritical and supercritical units to 1000MW ultra-supercritical units. The requirements for small flow and high pressure differential regulating valves are getting higher and higher. It is an important subject to develop a valve structure that not only meets the requirements of use, but also has a long service life and is easy to maintain. [0003] The minimum flow regulating valve of the feed water pump for super (ultra) critical thermal power units, the regulating valve of the water storage tank an...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high pressure difference regulating valve, by setting multi-layer throttling plates with varying numbers of pressure-reducing holes, the number and levels of throttling holes at different opening positions of the valve core can be changed to achieve the purpose of throttling. At the same time, the auxiliary flow channel groove is used to solve the problem of easy blockage in the valve body

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