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    There are significant differences between check valves and safety valves in many aspects, mainly reflected in function, structure, working principle and application scenarios. Here’s a breakdown:

    First, functional differences
    Check valve: The main function is to prevent the media from flowing back in the pipeline. It allows the medium to flow freely in one direction, but when the medium flows in reverse, the check valve will automatically close, thus avoiding the backflow of the medium. In addition, the check valve prevents the pump and drive motor from reversing, as well as the discharge of container media.
    Safety valve: mainly used as an overpressure protection device for pressure containers, equipment or pipelines. When the pressure in the equipment, container or pipeline rises beyond the allowable value, the safety valve will automatically open and discharge the media in full to prevent the pressure from continuing to rise, so as to protect the safe operation of the equipment, container or pipeline. When the pressure is reduced to the specified value, the safety valve will automatically close in time.
    Second, the structure and working principle of the difference
    Check valve:
    Structure: The opening and closing device of the check valve (valve disc) is usually opened and closed by the force of the medium flow. According to the different structure, the check valve can be divided into a variety of types such as lift, swing and disc.
    Working principle: When the medium flow, the valve disc by the thrust of the medium open; When the medium stops or reverses the flow, the valve disc is closed on the seat by the action of the weight or the pressure of the medium, thus cutting off the flow.
    Safety valve:
    Structure: The safety valve is usually composed of a seat, a disc and a loading mechanism (such as a spring, a weight, etc.). According to the overall structure and the different loading mechanism, the safety valve can be divided into a variety of types such as lever, spring and pulse type.
    How it works: When the pressure in the equipment, container or line rises beyond the allowable value, the loading mechanism is compressed or moved, causing the disc to leave the seat and opening the discharge path. When the pressure is reduced to the specified value, the loading mechanism will return to its original state and push the valve disc to close the discharge channel.
    3. Differences in application scenarios
    Check valve: mainly used in the pipeline system that needs to prevent the backflow of the medium, such as the pump water supply system, hot water system, etc. In these systems, check valves ensure a one-way flow of media in the pipe, avoiding backflow.
    Safety valve: mainly used in pressure containers, equipment or pipelines, as overpressure protection devices. For example, in boilers, pressure vessels, pipelines and other systems, safety valves can ensure that when the pressure rises beyond the allowable value of the timely discharge of media, thereby protecting the safe operation of equipment, vessels or pipelines.
    In summary, there are significant differences between check valves and safety valves in terms of function, structure, working principle and application scenarios. When selecting and using these two valves, the selection and operation should be carried out according to the specific application scenarios and needs.