What type of valve is typically found on a compressed gas cylinder?

A safety valve for pressure regulation is commonly found on compressed gas cylinders. This type of valve is crucial because it ensures that the internal pressure of the cylinder remains within safe limits during use. If the pressure exceeds a predetermined level, the safety valve will activate to release some of the gas, thereby preventing the cylinder from bursting or leading to other hazardous situations.

In the context of compressed gases, the safety valve plays a vital role in protecting both the equipment and the users by managing pressure and preventing accidents. It's designed to automatically release gas when the pressure rises too high, which is essential for maintaining safe operating conditions.

The other types of valves mentioned have specific purposes but do not serve the primary function necessary for maintaining the safety and integrity of compressed gas cylinders. For instance, a manual valve allows users to control the flow of gas but doesn’t inherently provide pressure regulation. A needle valve is typically used for precise control in lower flow applications, not commonly seen on standard gas cylinders. A venting valve is used to release gas but does not regulate pressure automatically like a safety valve does.