brief introduction

A valve that automatically opens and closes depending on the pressure difference generated by the flow of the medium itself. Its main function is to prevent the medium in the pipeline from flowing backwards and ensure the safe and stable operation of the fluid system. It is widely used in water supply and drainage, sewage treatment, petrochemical industry, electric power, HVAC and other fields, and is an indispensable protective valve component in the pipeline system.structureIt is mainly composed of valve body, disc, valve seat and spring (some types). As the main body of the connecting pipeline, the valve body provides installation space for internal components; Disc is the core opening and closing component, which can automatically open and close according to the change of medium flow direction; The valve seat and disc cooperate to form a sealing pair to ensure the sealing performance when the valve is closed; Some check valves are equipped with springs, which are used to assist the disc to reset and enhance the timeliness and reliability of closing.principle of operationBased on the flow direction and pressure difference of the medium: when the medium flows in the specified direction, its pressure pushes the valve disc to open, so that the medium can pass smoothly; When the medium tries to flow backward, the valve disc will automatically close under the action of its own gravity, spring force or pressure of the backflow medium, thus blocking the reverse flow of the medium, thus avoiding problems such as equipment damage and system pressure fluctuation caused by the backflow of the medium.Remarkable features: automatic opening and closing can be realized by relying on the energy of the medium itself without external driving device, with simple operation and energy saving; There are various structural forms, such as lifting type, swing type and butterfly type, which can be flexibly selected according to pipeline installation mode (horizontal and vertical), medium characteristics and working conditions; The sealing performance is good, and the leakage of medium can be effectively prevented by optimizing the matching accuracy between the disc and the valve seat and adopting wear-resistant and corrosion-resistant sealing materials; It has a wide application range, can adapt to water, steam, oil, gas and other media, and can work stably in a certain pressure and temperature range.