Multi-stage throttling labyrinth pressure reducing valve

Abstract

The invention provides a multi-stage throttling labyrinth pressure reducing valve which comprises a spring cover, a shell and a lower end cover. An adjusting nut is arranged at the upper end of the spring cover, an adjusting spring is arranged between the adjusting nut and a valve element, a return spring is arranged between the valve element and the lower end cover, the valve element is located in a sliding sleeve, the sliding sleeve is fixed in the shell, the shell forms a high-pressure cavity of an inlet and an outlet, a transition cavity is formed in the valve element, the shell and the sliding sleeve form a low-pressure cavity I, the lower end cover and the valve element form a low-pressure cavity II, the sliding sleeve and the valve element are correspondingly provided with upper throttling ports which communicate with the low-pressure cavity I and the transition cavity, the sliding sleeve and the valve element are correspondingly provided with middle throttling ports which communicate with the high-pressure cavity and the transition cavity, and the valve element is provided with a lower throttling port which communicates with the low-pressure cavity II and the transition cavity. The multi-stage throttling labyrinth pressure reducing valve has the advantages that pressure regulation is smooth and accurate, the anti-interference capability of the valve is improved, the structure is simple, maintenance is convenient, the service life is long, the cavitation risk of primary throttling high pressure difference is reduced, medium pressure feedback is more sensitive, and precision is higher.

Description

technical field [0001] The invention relates to a pressure reducing valve, in particular to a multi-stage throttling labyrinth pressure reducing valve. Background technique [0002] The multi-stage throttling labyrinth pressure reducing valve reduces the inlet pressure to the required outlet pressure by manually adjusting the loading force of the disc spring, and can use the energy of the medium itself to automatically maintain a certain outlet pressure when the inlet pressure and flow change. a relatively stable value. [0003] The commonly used pressure reducing valve is generally one-stage throttling, and the valve disc is conical or flat. Under low pressure drop, the one-stage throttling pressure reducing valve has a good effect, but under high pressure drop, it is easy to produce cavitation and cause premature damage to the throttling parts. Therefore, under high pressure drop, two or more pressure reducing valves are often used in series to achieve the purpose of red...

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a multi-stage throttling labyrinth pressure reducing valve, which solves the problem that the existing pressure reducing valve is prone to cavitation when the pressure drop of one throttling is too large, leading to premature damage of the throttling parts

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