A multi-stage throttling labyrinth pressure reducing valve

Abstract

The invention proposes a multi-stage throttling labyrinth pressure reducing valve, which includes a spring cover, a housing and a lower end cover. An adjusting nut is provided on the upper end of the spring cover, and an adjusting spring is provided between the adjusting nut and the valve core. There is a return spring between the covers, the valve core is located in the sliding sleeve, and the sliding sleeve is fixed in the housing, the housing forms a high-pressure chamber for the inlet and outlet, the valve core forms a transition chamber, the housing and the sliding sleeve form a low-pressure chamber I, and the lower end cover The low-pressure chamber II is formed with the spool. The sliding sleeve and the spool are correspondingly provided with an upper throttle port connecting the low-pressure chamber I and the transition chamber, and the sliding sleeve and the spool are correspondingly provided with a middle throttle port connecting the high-pressure chamber and the transition chamber. The spool is provided with a lower throttle port connecting the low-pressure chamber II and the transition chamber. The invention has the advantages of smooth and precise pressure regulation; improved anti-interference ability of the valve; simple structure, convenient maintenance and long service life; reduced cavitation risk of high pressure difference at the first level of throttling; more sensitive feedback medium pressure and higher precision .

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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