High pressure small flow string control valve

Abstract

The invention relates to a regulating valve, in particular to a high-pressure and micro-flow tandem type regulating valve, and belongs to the technical field of control valves. The high-pressure and micro-flow tandem type regulating valve comprises a valve body, wherein a valve seat is arranged in the valve body, a second gasket is arranged between the valve body and the valve seat, a guide pressing sleeve is arranged at the upper end of the valve seat, the upper end of the valve body is connected with an upper cover through a bolt, the upper cover tightly presses the guide pressing sleeve and the valve seat in the valve body, and a first gasket is arranged between the valve body and the upper cover. The upper end of the upper cover is connected with a packing pressing board through a bolt. A valve element assembly is installed in the valve seat in a matched mode, the upper end of the valve element assembly penetrates through the guide pressing sleeve, the upper cover extends out of the packing pressing board, packing is arranged between the valve element assembly and the upper cover, a packing pressing cover is arranged between the packing and the packing pressing board, and the packing pressing board tightly presses the packing pressing cover and the packing. According to the high-pressure and micro-flow tandem type regulating valve, the tandem type structure is adopted, the multi-stage depressurization function is achieved, the flow velocity of media is reduced, the inner parts of the valve are protected effectively, and the noise of the valve is lowered; meanwhile, the phenomenon that as the throttling area is small when micro-flow regulation is performed, the valve is blocked can be avoided; the valve element assembly is of a double-guide structure and is prevented from bending and deforming, the regulation stability of the valve is improved, and the service life of the valve is prolonged.

Description

technical field [0001] The invention relates to a control valve, in particular to a high-pressure micro-flow series control valve, which belongs to the technical field of control valves. Background technique [0002] The hydrocracking process is the main technical method in the oil refining industry. Its primary conversion rate is usually in the range of 60% to 90%, and there are still 10% to 40% of unconverted products, which are called hydrocracking tail oil. By-products of cracking units. At present, many domestic refineries do not make good use of this part of tail oil, and a large part is used for plant circulation, resulting in the decline of the actual processing capacity of the plant, thereby reducing the production efficiency of the plant and affecting the economic benefits of the refinery. [0003] The wide-distillation (flexible) special oil production unit uses hydrocracking tail oil and hydrogen as the main raw materials, adopts high-pressure catalytic hydrogen...

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Problems solved by technology

[0005] High-fraction oil and sulfur-containing sewage produced by hydrocracking tail oil high-pressure hydrogenation reaction, the maximum pressure can reach 2500Lb, the maximum adjustable pressure difference can reach 17MPa, the maximum flow rate is less than 2t / h, and there are water and trace amounts of H in the medium 2 S, the traditional regulating valve cannot work normally under such a high pressure difference, and the material of the valve trim must meet the requirements of NACEMR0175, the hardness value is generally ≤ HRC22, the valve trim is easily damaged by erosion, and cannot meet the small flow adjustment; The step-down regulating valve can control the flow rate of high-pressure differential medium, but the flow path of the labyrinth group is small and has many turns, which is extremely unsuitable for high-viscosity and impurity-containing medium conditions

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