止回閥英文符號及圖例大全

Check Valve Symbols and Diagrams: A Complete Guide

Check valves, also known as non-return valves, are essential components in piping systems. They allow the flow of fluid in only one direction and prevent backflow, protecting equipment and ensuring the safety of the system. To understand the operation and installation of check valves, it's important to be familiar with the various symbols and diagrams used in the industry. In this article, we'll provide a comprehensive guide to check valve symbols and diagrams.

Symbol and Diagram for Swing Check Valve

A swing check valve is a type of check valve that uses a hinged disc to allow fluid to flow in one direction and prevent backflow. The symbol for a swing check valve is a simple curved shape with an arrow indicating the direction of flow. The diagram for a swing check valve shows the valve body, hinge pin, and disc, with arrows indicating the direction of flow.

Symbol and Diagram for Lift Check Valve

A lift check valve is another type of check valve that uses a disc to allow fluid flow in one direction and prevent backflow. The disc is lifted off the seat by the flow of fluid, allowing the fluid to pass through. The symbol for a lift check valve is similar to the symbol for a swing check valve, but with a horizontal line indicating the position of the disc when closed. The diagram for a lift check valve shows the valve body, disc, and seat, with arrows indicating the direction of flow.

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Symbol and Diagram for Ball Check Valve

A ball check valve uses a ball-shaped disc to control the flow of fluid. When the fluid flows in the correct direction, the ball is pushed away from the seat, allowing the fluid to pass through. When the fluid tries to flow in the opposite direction, the ball is pushed back against the seat, preventing backflow. The symbol for a ball check valve is a circle with an arrow indicating the direction of flow. The diagram for a ball check valve shows the valve body, ball, and seat, with arrows indicating the direction of flow.

Symbol and Diagram for Diaphragm Check Valve

A diaphragm check valve uses a flexible diaphragm to control the flow of fluid. When the fluid flows in the correct direction, the diaphragm is pushed open, allowing the fluid to pass through. When the fluid tries to flow in the opposite direction, the diaphragm is pushed back against the seat, preventing backflow. The symbol for a diaphragm check valve is a triangle with an arrow indicating the direction of flow. The diagram for a diaphragm check valve shows the valve body, diaphragm, and seat, with arrows indicating the direction of flow.

Conclusion

Check valves are critical components in any piping system, and it's important to understand their operation and installation. By familiarizing yourself with the symbols and diagrams used in the industry, you'll be better equipped to select and install the appropriate check valves for your applications. The symbols and diagrams for swing check valves, lift check valves, ball check valves, and diaphragm check valves are all relatively simple and easy to understand, but they provide essential information about the operation of the valves. Use this guide as a reference when working with check valves, and you'll be sure to make informed decisions about their selection and installation.