Ball air valves, specifically in the context of preventing air or liquid from passing, work by using a spherical ball with a hole through its center to control flow. They seal by utilizing seats, often made of materials similar to o-rings, that press against the ball to create a leak-proof seal.
Here's a breakdown of their operation:
- Basic Principle: The valve's operation revolves around a ball with a bore through it. By rotating the ball, you align the bore with the flow path (open position) or block the flow path (closed position).
- Sealing Mechanism: The seats, typically made of elastomer or PTFE, are crucial for creating a tight seal. They press against the polished surface of the ball, preventing fluid or air from leaking past. These seats are designed to withstand pressure and wear, ensuring reliable sealing over time.
- Operation: A handle or actuator is connected to the ball, allowing the user to rotate it. A quarter-turn (90 degrees) is typically sufficient to switch between fully open and fully closed positions.
- Applications: Ball valves are commonly used in various applications, including plumbing, gas lines, and industrial processes, to control the flow of liquids and gases.
The video reference highlights that the sealing components around the ball function similarly to O-rings. The seats prevent any fluid from bypassing the ball, which is crucial for the valve's shut-off capability.
