A sandwich-type non-return valve is a type of valve used to prevent backflow in a pipeline or system. It is called a sandwich valve because it is typically mounted between two flanges in a pipeline, with the valve body sandwiched between the flanges.

The valve consists of a valve body, a valve disc, a spring, and a hinge pin. When the flow is going in the desired direction, the valve disc is pushed open by the flow, allowing it to pass through the valve. When the flow tries to reverse direction, the valve disc is pushed closed by the spring, preventing any backflow. The hinge pin allows the valve disc to pivot, ensuring that it can open and close smoothly.

One of the advantages of a sandwich-type non-return valve is that it can be easily installed in an existing pipeline without the need for major modifications. It is also relatively low-cost compared to other types of non-return valves. The valve can be made from a variety of materials, depending on the application, including brass, stainless steel, and plastic.

However, one potential disadvantage of this type of valve is that it may be less effective at preventing backflow in certain situations. For example, if there is a sudden surge in the reverse flow, the valve disc may not close quickly enough to prevent backflow. In addition, the valve may not be suitable for use in applications where a high degree of precision is required.

Overall, the sandwich-type non-return valve is a useful component in many pipeline systems, providing a simple and cost-effective way to prevent backflow. As with any type of valve, it is important to select the right type of valve for the specific application, and to ensure that it is properly installed and maintained to ensure reliable performance over time.

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