What is the structure of a pneumatic ball valve

Structure of Pneumatic Ball Valves

Pneumatic ball valves primarily consist of the following components:

‌Valve Body‌:
Typically made of high-strength, corrosion-resistant materials like cast iron or stainless steel. The interior features a spherical cavity housing the ball.

‌Ball‌:
The core component, usually stainless steel, with a polished surface to enhance sealing. It contains a circular bore/channel along its axis to control fluid flow.

‌Valve Seat‌:
Positioned within the valve body, it supports the ball and ensures sealing. Made of wear/corrosion-resistant materials (e.g., rubber, PTFE).

‌Stem‌:
Connects the handle (or gear) to the ball. Rotating the handle (or gear) drives the ball via the stem.

‌Pneumatic Actuator‌:
The core component, comprising a cylinder, FRL unit (Filter-Regulator-Lubricator), solenoid valve, etc. It utilizes air supply to drive cylinder motion, rotating the stem and ball to open/close the valve.

Working Principle of Pneumatic Ball Valves

The operation follows these steps:

‌Closed State‌:
The ball's bore is perpendicular to the valve's inlet/outlet ports, blocking fluid flow and achieving sealing.

‌Opening Process‌:
Compressed air enters the actuator cylinder, pushing the piston upward. The piston motion rotates the ball via the stem. As the ball turns, its bore aligns gradually with the ports.

‌Open State‌:
After a 90° rotation, the bore fully aligns with the ports, allowing unrestricted fluid flow.

‌Control Method‌:
Opening/closing is controlled by regulating the air supply, typically managed via pneumatic or electric devices that adjust actuator operation.