Improved method and device for preventing internal leakage of high bypass pressure reducing valve

Abstract

The invention discloses an improved method and device for preventing internal leakage of a high bypass pressure reducing valve. The method comprises the following step I of dismounting of a valve seat: specifically arranging a protective blanket at the port of a pipeline when equipment is used for cutting the valve seat, so that foreign matters or welding slag is prevented from entering the pipeline, and adopting a layered cutting mode in the cutting process of the valve seat; searching an original weld joint by using flaw detection agent after cutting each time, so that a welding pool at the position of a valve body is prevented from being cut off, and preventing a welding surface from being expanded; the step II, modification of a sealing face, specifically dismounting the pressure reducing valve after the valve seat is cut, and then modifying and upgrading a 30-degree conical sealing surface in an original pressure reducing valve into an anti-scouring embedded double-sealing surface; and achieving the purposes of thoroughly solving the internal leakage of the high-pressure valve, reducing the heat consumption rate of a unit and improving the operation heat economy of the unit.

Description

technical field [0001] The invention belongs to the field of pressure reducing valves, and in particular relates to an improved method and device for preventing internal leakage of a high side pressure reducing valve. Background technique [0002] The high-pressure pressure reducing valve is suitable for water, steam and air medium pipelines. The inlet pressure is reduced to a certain required outlet pressure through adjustment. When the inlet pressure and flow rate change, the outlet pressure is automatically maintained within a certain range by the energy of the medium itself. within, but the difference between inlet pressure and outlet pressure must be ≥0.2MPA / CM. [0003] You can refer to the Chinese patent with the publication number CN101625043B, which relates to a high-pressure pressure relief valve. The valve seat is provided with an orifice connecting the air inlet chamber and the air outlet chamber and a valve core axially movable through the orifice. The spool is...

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Problems solved by technology

[0004] The above-mentioned patent has the advantages of making the axial force of the inlet pressure acting on the spool zero, eliminating the influence of inlet pressure fluctuations on the outlet pressure, and improving the accuracy of pressure stabilization, but it also has defects, such as: its spool assembly After long-term erosion by steam, internal leakage is prone to occur, which seriously affects the thermal economy during operation

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