A high-pressure modulation type pilot-operated safety valve

Abstract

The invention provides a high-pressure modulated type pilot operated safety valve which comprises a main valve and a pilot valve which are connected with each other. The pilot valve comprises a cylindrical pilot valve body, and an inlet pressing sleeve is connected with the lower end of the pilot valve body through a thread. An outlet valve seat is fixed above the inlet pressing sleeve, and an inlet valve seat is arranged above the outlet valve seat and is connected with the lower portion of a feedback piston through threads. The lower portion of a pilot valve shaft is mounted in the outlet valve seat, and the upper portion of the pilot valve shaft is mounted in the inlet valve seat. The feedback piston is arranged on the upper portion in the pilot valve body, the upper end of the feedback piston is connected with a piston through threads, and a piston cavity is formed among the feedback piston, the piston and the pilot valve body. A spring is arranged in a cavity formed by the pilot valve body and a valve deck. Three medium flowing channels are arranged on the pilot valve body and comprise the side face middle channel, the side face lower channel and the bottom face channel. According to the high-pressure modulated type pilot operated safety valve, the novel pilot valve structure is designed, the main valve response is made more timely, the high-pressure modulated type pilot operated safety valve is suitable for severe high-pressure work stations, and the structure of the pilot valve is more compact.

Description

technical field [0001] The invention relates to a pilot-operated safety valve used for overpressure protection in high-pressure working conditions, in particular to a high-pressure modulation pilot-operated safety valve, which can not only achieve good sealing and timely opening under working conditions exceeding 10MPa , It can also adjust the discharge capacity according to the actual demand of the system for overpressure protection, and has excellent modulation characteristics. Background technique [0002] The modulated pilot safety valve is an indirect-acting safety valve, which consists of a main valve and a pilot valve. It relies on the pilot valve to control the flow of medium to drive the main valve to open or close. It has excellent modulation characteristics and can be adjusted in time according to the system pressure. Emission capacity, energy saving and environmental protection, the market demand is strong. Such as figure 1 Shown is a schematic structural diagr...

AI Technical Summary

Problems solved by technology

However, when the conventional modulated pilot valve is used under high-pressure conditions, due to structural limitations, the main valve cannot quickly respond to changes in the air chamber pressure, and its opening pressure lags behind severely, making the above difference beyond a reasonable range

[0007] (2) The structure of the pilot valve is not compact

Moreover, the bonnet and valve body of conventional pilot valves are connected by flanges, resulting in a large structure of the entire pilot valve.

[0008] At the same time, the outline of the valve body of the conventional pilot valve is a cuboid, and the medium enters horizontally from the outside of the valve body. On the one hand, the influence of flow resistance is increased, and on the other hand, the volume of the valve body is increased.

In addition, considering factors such as the installation of accessories, there are many holes drilled outside the valve body, which will also affect its strength.

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