What device is used to control both the pressure and flow of gas from a cylinder?

The device that is used to control both the pressure and flow of gas from a cylinder is a regulator. Regulators are essential in medical gas applications because they reduce the high pressure of gas in a cylinder to a safe and usable level. In addition to controlling pressure, they also allow for precise adjustment of the flow rate of gas being delivered to patients or equipment.

Regulators work by using a diaphragm and spring mechanism to maintain a consistent output pressure regardless of the changing input pressure as the gas is being used. This ensures that patients receive an accurate dosed amount of gas, which is critical in medical settings to maintain safety and efficacy.

In contrast, other devices like compressors, manifolds, and flowmeters serve different functions. A compressor increases the pressure of gas and is used to transfer it, while a manifold connects multiple gas cylinders to a common outlet but does not regulate pressure or flow. A flowmeter measures the flow rate of gas but does not control pressure directly. Thus, the regulator is the key component that fulfills the requirements of both controlling pressure and flow.