Types and Uses of Check Valves
Thread Content
Check valves have a wide range of applications and come in many types. The following refers to the check valves commonly used in water supply and heating systems: 1. Spring-type: When liquid flows from bottom to top, the pressure pushes up the valve disc controlled by the spring; once the pressure disappears, the spring force pushes the valve disc back down, preventing the liquid from flowing backward. It is commonly used in check valves with small passages. 2. Gravity type: Similar to the spring type, it relies on the weight of the valve disc itself to close and prevent backflow. 3. Swing type: The liquid flows directly through the valve body; the rotating valve disc on one side is pushed open by pressure. When the pressure is removed, the disc returns to its original position due to its own weight, while the reverse liquid pressure keeps the disc closed. The principles of other check valves, such as those used for waste discharge, explosion-proof valves in civil defense applications, and check valves for liquids, are more or less the same.
As a suggestion, it’s best to indicate the model number; otherwise, those who are not familiar with the product won’t be able to tell which one you mean. It’s better to provide all the details to avoid any misunderstandings
For flanged connections, H41H refers to vertical check valves, H44H denotes swing check valves, and H42H is also a vertical check valve. There are also butterfly type valves such as H74H, H76H, H77H, etc
Reply to 4#: Can HT200 be used for Suzhou No.2 Valve PN1.6 DN100~200? Where can I find the relevant design specifications and standards for spring-type check valves and their parameters? Thank you
Poster: The description is incomplete. Check valves can be classified as follows: 1. Axial flow check valves 2. Double-disc check valves 3. Swing check valves 4. Lift check valves
I’ve learned it now and it’s clearer than before; the original poster is a good person