Pilot-operated high pressure pressure reducing valve with stable output flow and pressure and method thereof

Abstract

The invention discloses a pilot-operated high-pressure decompression valve with stable output flow and pressure and a method thereof. The decompression valve comprises a valve cover, a main valve body and a pilot valve; wherein the pilot valve comprises a pilot valve body, a pilot valve seat, Pilot spool and pilot spring; there is an airflow channel inside the pilot spool, when the second chamber and the third chamber are connected, the fluid entering the pilot valve from the main inlet can flow out from the main outlet through the airflow channel; the pilot valve seat The second through hole communicates with the air outlet of the main valve body through the first pilot tube, and the third through hole communicates with the air accumulation chamber through the third pilot tube; the side wall of the pilot valve core is provided with an annular groove in the circumferential direction, when the main outlet is closed In the state, the annular groove communicates with the second through hole and the third through hole respectively. The invention utilizes the decompression effect of the four-way pilot valve to realize the pressure difference between the upper and lower end surfaces of the valve core, ensuring that the opening of the valve core increases when the inlet pressure decreases, thereby maintaining the stability of the outlet flow and pressure of the decompression valve.

Description

technical field [0001] The invention belongs to the field of valve devices, in particular to a pilot-operated high-pressure decompression valve with stable output flow and pressure and a method thereof. Background technique [0002] Hydrogen, as a clean energy, generates water vapor when burned. It is a safe, non-toxic, renewable and clean energy. It has the advantages of abundant resources, high combustion value, cleanliness, and renewability, and is increasingly concerned by countries all over the world. In daily transportation, hydrogen is often compressed in high-pressure hydrogen storage bottles, especially widely used in hydrogen fuel cell vehicles. In hydrogen fuel cell vehicles, hydrogen is generally stored in gas cylinders in the form of high-pressure gaseous hydrogen, which needs to be decompressed to a specified pressure through a pressure reducing valve before being used for fuel cells. As the main component of the on-board high-pressure hydrogen storage bottle,...

AI Technical Summary

Problems solved by technology

The flow rate of the traditional pressure reducing valve will decrease with the decrease of the inlet pressure, and the flow rate and pressure of the outlet gas cannot be kept stable. When the pressure of hydrogen gas changes, the gas pressure and flow rate at the outlet will change accordingly.

This affects the stability of the fuel supply of the fuel cell and shortens the lifetime

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