An excess flow valve (EFV) is an option available for air cylinders. When fitted, the excess flow valve is a safety device which prevents uncontrolled release of high-pressure air in case of cylinder valve or high-pressure air pipe damage. The excess flow valve also activates if the cylinder valve is opened when the cylinder valve outlet is open to atmosphere. Cylinder valves containing an excess flow valve have a grey hand wheel in most countries.

Furthermore we advise to fit a protective valve cap when cylinders are strored or transported. When carrying the cylinder, you can hold it at the bottom of the valve. Do not carry the cylinder by holding the hand wheel.