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bloem seal valves are valves that reduce inlet pressure to a required outlet pressure through regulation, and rely on the energy of the medium itself to automatically maintain stable outlet pressure. From a fluid mechanics perspective, a pressure reducing valve is a throttling element with variable local resistance; that is, by changing the throttling area, it alters flow velocity and fluid kinetic energy, causing different pressure losses to achieve pressure reduction. Then, through the adjustment of the control and regulation system, the fluctuation of downstream pressure is balanced with the spring force, keeping the downstream pressure within a certain error range.