Pressure maintaining check valve

Abstract

The invention discloses a pressure maintaining check valve. The valve comprises a valve element assembly mounted in a valve element passageway. The valve element assembly comprises a) at least two stages of check sleeves which are sleeved in sequence, wherein the closing ends of the stages of check sleeves are provided with sleeving openings which correspond to one another and the cross sections are decreased in sequence; and the check sleeves penetrate through the corresponding sleeving openings, sleeve limit flanges are arranged at the front ends of the check sleeves correspondingly, and sleeve sealing covers are arranged at the rear ends of the sleeves correspondingly; b) a check sealing plug used for closing the sleeving opening in the check sleeve of the final stage, wherein a sealingplug limit flange is arranged at the front end of the sealing plug, and a sealing seal cover is arranged at the rear end of the sealing plug; and c) sleeve magnetic assemblies which are arranged between the adjacent check sleeves and attract with each other, wherein attracting sealing plug magnetic assemblies are arranged between the check sleeve of the final stage and the check sealing plug. According to the pressure maintaining check valve provided by the invention, the internal opening size is automatically regulated according to the inflow pressure, and the pressure at an outlet is guaranteed to be stable and controllable.

Description

technical field [0001] The invention relates to a valve body, in particular to a pressure stabilizing check valve. Background technique [0002] The pressure stabilizing check valve is also called one-way valve or check valve, and its function is to prevent the medium in the pipeline from flowing backward. The opening and closing parts are opened or closed by the flow and force of the medium to prevent the backflow of the medium. The valve is called a pressure stabilizing check valve. The pressure stabilizing check valve belongs to the automatic valve category, and is mainly used on pipelines where the medium flows in one direction, and only allows the medium to flow in one direction to prevent accidents. Typically, fluid under pressure opens the valve's disc and flows from the inlet side to the outlet side. When the pressure on the inlet side is lower than that on the outlet side, the disc automatically closes the channel under the fluid pressure to prevent the fluid from...

AI Technical Summary

Problems solved by technology

[0003] In practical applications, the traditional pressure-stabilizing check valve has the following defects: when the disc is working, it is easily affected by gravity, and fluid resistance directly affects the reaction speed of the valve disc; when the pressure-stabilizing check valve is in the process of closing, then It will cause liquid hammer in the liquid pipeline and generate a lot of noise

Because the outlet flow suddenly increases, it will inevitably increase the fluid pressure at the outlet, which may have an adverse effect on the operation of the next stage, and even cause the risk of damage to sensitive equipment at the outlet

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