Valve Cage

A valve cage is a component found in certain types of valves, specifically in the supply class of valves that are nonpowered. It is part of the valve assembly and plays a crucial role in controlling the flow of fluid or gas through the valve.

The valve cage is typically a cylindrical or conical structure that surrounds the valve plug or disc. It serves several purposes, including:

1. Guiding the valve plug: The cage provides support and guidance to the valve plug, ensuring proper alignment and movement within the valve body. This helps maintain a tight seal and prevents leakage.

2. Flow control: The design of the valve cage can influence the flow characteristics of the valve. By altering the shape or pattern of the cage, the flow rate, pressure drop, and other flow parameters can be adjusted to meet specific requirements.

3. Protection: The valve cage acts as a protective barrier, shielding the valve plug from damage caused by high fluid velocities, erosion, or cavitation. It helps prolong the lifespan of the valve by reducing wear and tear.

Valve cages are commonly used in various industries, including oil and gas, chemical processing, water treatment, and power generation. They are often made from materials such as stainless steel, carbon steel, or other alloys, depending on the application and the fluid or gas being controlled.

In summary, a valve cage is an essential component of nonpowered valves in the supply group of valves. It provides support, guidance, and flow control, ensuring efficient and reliable operation of the valve.