Large-caliber ultrahigh-pressure differential steam emptying valve

Abstract

The invention relates to a large-caliber ultrahigh-pressure differential steam emptying valve. The large-caliber ultrahigh-pressure differential steam emptying valve comprises a valve body, wherein aself-sealing valve seat is arranged in the valve body, a maze sleeve and a pressing ring are sequentially connected to the self-sealing valve seat, and the pressing ring, the maze sleeve and the self-sealing valve seat are pressed in the valve body through a pressing four-split ring; the upper end of the valve body is connected to a valve cover pressing plate, a self-sealing valve cover is arranged in the valve cover pressing plate in a penetrating mode, the sealing end of the self-sealing valve cover is connected to the valve cover pressing plate through a valve cover adjusting bolt and a valve cover nut, and a valve cover self-sealing ring is arranged between the sealing end and the valve body; and a valve cover four-split ring which is located on the upper side of the sealing end of theself-sealing valve cover is arranged in the valve body, a stepped valve element is arranged in the pressing ring, the maze sleeve and the self-sealing valve seat, a valve element sealing mechanism isarranged on the outer side of the stepped valve element, the upper end of the stepped valve element is connected to a valve rod, the valve rod penetrates through the self-sealing valve cover to extend to the outside, and the valve rod and the self-sealing valve cover are sealed through a valve rod sealing mechanism. According to the large-caliber ultrahigh-pressure differential steam emptying valve, the valve seat is detachable, mounting and maintaining are convenient, operation is stable, and sealing is firm.

Description

technical field [0001] The invention relates to a steam venting valve, in particular to a steam venting valve with a large-diameter ultra-high pressure difference. Background technique [0002] In large-scale coal chemical projects, the large-diameter high-pressure-difference large-flow steam vent valves installed on the steam main pipe to protect the air separation unit have relied on imported products for a long time, basically relying on imported products, basically It is a multi-hole or labyrinth sleeve valve structure, self-sealing valve cover, integrated valve seat and valve body, and pilot valve core structure. Because it is used for venting with large diameter and ultra-high pressure difference, only the multi-layer labyrinth sleeve structure can meet the requirements of high pressure difference and low noise. However, due to the poor design of the connection with the stuffing box, many labyrinth sleeves are It is integrated with the valve seat, and is connected wit...

AI Technical Summary

Problems solved by technology

However, in the actual use process, there are often problems such as the small flow rate cannot be adjusted, the valve thrust increases after the pilot valve core is opened, and the valve is easy to surge during the closing process; It goes directly into the valve seat without reducing the pressure, causing the connecting pin to bear a lot of pressure, which may cause the pin to break or fail, and eventually cause the labyrinth sleeve to fall apart. Such an accident happened to the product imported on site.

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