Types of Check Valves
Check valves are designed to allow fluid to flow in one direction only, preventing backflow. Depending on their design and purpose, check valves can be classified into the following categories:
1) Swing Check Valve: Swing check valves are the most common type of check valve used in steam systems. They have a disc that swings on a hinge to allow fluid to pass through in one direction only. When the flow of fluid reverses, the disc swings back to its original position, blocking the flow.
2) Lift Check Valve: In lift check valves, the disc is lifted away from the seat to allow fluid to pass through. When the fluid flow reverses, the weight of the disc causes it to fall back into its original position, blocking the flow.
3) Ball Check Valve: In ball check valves, a ball is used to block the flow of fluid when the flow reverses. When the fluid flow is in the right direction, the ball is pushed away from the seat, allowing fluid to pass through.
4) Diaphragm check valve: A flexible diaphragm is used to block the flow of fluid in this type of valve. When the fluid flow reverses, the diaphragm flexes and blocks the flow.
Uses of Boiler Check Valves
Boiler check valves are mainly used in steam systems to prevent backflow of steam to the boiler. They are typically installed on the connections between the boiler and steam line or where the steam line connects to the condensate return. They can also be used in vents, drains, by-pass systems, and instrument isolation in ASME Boiler and Pressure Vessel Code, Section I applications.
Why Use Forged Steel Check Valve?
Forged steel check valves are best for high-pressure and high-temperature applications in steam systems. They are made from high-strength forged steel to withstand the rigors of the steam system. Compared to cast valves, forged steel check valves have a higher tolerance for high-pressure and high-temperature applications. They are also more durable and resilient than cast valves.
Conclusion
Installing the right check valves is critical to the safety and efficiency of your boiler system. By preventing backflow of steam to the boiler, check valves protect the boiler and its workers. Investing in high-quality forged steel check valves designed specifically for ASME Boiler and Pressure Vessel Code, Section I applications can improve the safety and reliability of your steam system. If you're looking for high-quality check valves for your boiler system, make sure to research and consider the different types and designs available. Contact a professional vendor for more information, but do not forget to specify the use of ASMEdesign check valves. This will ensure that the safety and compliance requirements are met.