Small pressure reducing valve and pressure reducing device in high-pressure high-flow fluid system

Abstract

The invention discloses a small pressure reducing valve and a pressure reducing device in a high-pressure high-flow fluid system. The small pressure reducing valve comprises a valve core (21) with the piston function, a nut (22) and a first sealing piece are sheathed in the upper end position of the valve core, a second sealing piece is sheathed on a valve core piston at the lower end of the valve core, a spring (27) is sheathed at the middle end of the valve core, the upper end of the spring is fixed on the valve core, an outer sleeve (32) with a groove at the lower end is installed on the periphery of the spring, and a screw sleeve (14) is installed on the periphery of a valve core piston near the lower end of the valve core. As a first-stage pressure reducing valve of a pressure reducing device in the high-pressure high-flow fluid system, the small pressure reducing valve has the action of maintaining high-flow constant pressure to be supplied to a second-stage pressure reducing valve for pressure reduction, so that the outlet pressure and flow of the entire pressure reducing system can be ensured at preset accuracy more reliably.

Description

technical field [0001] The invention relates to the technical field of fluids, and more specifically relates to a valve suitable for decompression in high-pressure and large-flow fluid systems. Background technique [0002] In a high-pressure, large-flow fluid system, it is usually difficult to implement only one stage of decompression for the fluid. In most cases, two or more stages of decompression are required. Due to the conventional design of the pressure reducing valve, the outlet pressure of the first stage pressure reducing valve is the inlet pressure of the second stage pressure reducing valve, and the inlet pressure of the second stage pressure reducing valve is more than twice the outlet pressure. When the system requires the outlet flow of the second-stage pressure reducing valve to be relatively large, it must be required that the inlet pressure and flow must be stable within a certain range. If the first-stage pressure reducing valve is designed with a convent...

AI Technical Summary

Problems solved by technology

If the first-stage pressure reducing valve is designed with a conventional pressure-reducing method, unless the inlet pressure of the first-stage pressure-reducing valve is maintained, the outlet pressure and flow rate of the second-stage pressure-reducing valve can be kept stable, which requires a large volume of upstream pressure source , the pressure is high, and the biggest defect is that the upstream pressure is used to 4 times the outlet pressure of the second-stage pressure reducing valve and cannot be reused. The system design cannot bear this harsh requirement

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