Small-flow and large-pressure-difference adjusting valve

Abstract

The invention discloses a small-flow and large-pressure-difference adjusting valve which comprises a valve element, a valve cover, a multi-layer shutoff reducing valve cage, a valve body, a valve headand a valve seat. The valve element and the valve rod are integrated, and the bottom of the valve element is mounted in the valve head. The multi-layer shutoff reducing valve cage is assembled in thevalve body, and the upper end of the valve seat is connected with an execution mechanism. A supporting ring is arranged above the multi-layer shutoff reducing valve cage, and a valve head seal is arranged in the multi-layer shutoff reducing valve cage. A valve head nut is arranged above the valve head. A butterfly spring is arranged below the valve head nut. According to the small-flow and large-pressure-difference adjusting valve, the influence of impurities in a pipeline on the sealing effect is effectively avoided, a sealing pair in the valve is protected better, the service life of the valve is prolonged, and the reliability of the valve is also improved.

Description

technical field [0001] The invention relates to the technical field of high-parameter regulating valves, in particular to a regulating valve with small flow rate and large pressure difference. Background technique [0002] Any industrial production has pipeline transmission and pipeline control equipment and facilities, but in the actual production and system operation process, under the condition of small flow, the pressure difference between the front and rear of the valve is the largest, the flow velocity of the medium in the valve is also the largest, and the temperature of the medium in the valve High, frequent opening and closing during operation, etc., it is extremely common that the working conditions cause severe erosion to the valve. The small flow and large pressure difference regulating valve is located at the outlet of the large high-pressure boiler feed water pump. Its main function is to open the valve to form a circulating backflow when the feed water pump is...

AI Technical Summary

Problems solved by technology

Due to the structure of low entry and high exit, the impurities in the pipeline can easily enter the sealing part, but cannot be discharged smoothly from the flow hole of the cage, so it is very easy to cause the valve core and cage to get stuck, or be squeezed. In the middle of the sealing pair in the valve, the sealing pair is not closed tightly, resulting in leakage in the valve, causing the sealing pair to lose its sealing performance

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