Water hammer eliminating and pressure reducing device for valve protection

Abstract

The invention discloses a water hammer eliminating and pressure reducing device for valve protection. The water hammer eliminating and pressure reducing device comprises a first connecting pipe, a device body and a second connecting pipe which are sequentially arranged from left to right. The water hammer eliminating and pressure reducing device has the advantages that in the water hammer eliminating and pressure reducing device, on one hand, in a first straight plane, a first inclined plane, a second straight plane, a second inclined plane and a third straight plane with the widths constantlyincreased, according to the Bernoulli principle, the water pressure is gradually reduced when the width is gradually increased; on the other hand, water flow constantly extrudes a plurality of pistonplates, a second spring is compressed, air in a first compression cavity and a second compression cavity passes through a first communication pipe and a second communication pipe to be pressed into first flow stopping bags and second flow stopping bags, the first flow stopping bags and the second flow stopping bags in a plurality of acting pieces can form flow stopping planes for closing a waterpassing port, and valve impacts are avoided; and due to compressibility of air, a third compression cavity can further achieve the pressure reduction function, the water hammer is thoroughly eliminated, the structure is simple, and the manufacturing cost is low.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a water hammer elimination and decompression device for protecting valves. Background technique [0002] Water hammer is when there is a sudden power failure or when the valve is closed too fast, due to the inertia of the pressure water flow, a water shock wave is generated, just like a hammer, so it is called water hammer. The force generated by the back and forth shock waves of the water flow, sometimes so great, can damage valves and pumps. [0003] When the electric water pump is started at full voltage, it can accelerate from a static state to a rated speed in less than 1 second, and the flow in the pipeline increases from zero to the rated flow. Since the fluid has momentum and a certain degree of compressibility, a sharp change in the flow rate will cause an impact of too high or too low pressure in the pipeline, as well as the phenomenon of "cavitation". The impact of pr...

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Problems solved by technology

[0004] The instantaneous pressure of water hammer greatly exceeds the normal pressure, and often produces destructive effects, causing strong vibration or noise in the piping system, and may damage the valve joints, which has a great destructive ef

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