Single-seat angle valve with special structure

Abstract

The invention relates to a single-seat angle valve with a special structure. The angle valve adopts a bottom inlet and side outlet mode. Due to a fact that a front-back pressure difference is large, two throttling pieces are directly added at an inlet in a bottom of a valve body, the throttling pieces achieve a two-stage pressure reduction effect, and an initial speed of a fluid entering into an inner cavity to scour inner pieces is reduced. The valve inner pieces of the angle valve is completely made of urea-grade austenite U3 stainless steel so that corrosion is reduced, and the valve innerpieces can be used for a long time. A valve core and a novel noise reduction cage are forged integrally, mechanical strength of the internal pieces is guaranteed, and valve core breakage caused by vibration is avoided. The novel noise reduction cage is additionally arranged in the valve internal pieces, and an unbalanced force caused by scouring is balanced through flow holes which are unevenly distributed. Special guidance exists between the novel noise reduction cage and the valve core, the valve core can be supported and fixed, and vibration generated by the valve core is reduced. The improved high-pressure angle valve can better face various challenges in a urea process.

Description

technical field [0001] The invention relates to a single-seat angle valve with a special structure. Background technique [0002] In China's chemical fertilizer industry, the core urea plant is very critical. In the past, all control valves of domestic manufacturers were imported as supporting equipment, but foreign urea processes require that all high-pressure angle valves in the process must use parabolic single-seat control valves. Therefore, when the domestic urea production process is introduced, it is also required that the high-pressure angle valve in the urea plant must adopt a parabolic single-seat regulating valve. Although there are corresponding products in China, due to the large gap between the mechanical properties of domestic materials and the internal design of angle valves and foreign countries, domestic valves usually need to be overhauled after half a year of use, while foreign valves are used for at least five years. [0003] The characteristics of the ...

AI Technical Summary

Problems solved by technology

[0005] The technical problems to be solved in this application are: erosion and cavitation cause damage to the valve internal parts; when the valve opening is small, the noise and vibration in the valve are high; the valve core is broken due to the erosion caused by the vibration; Serious, the adjustment quality is reduced, etc.

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