BOC - Understanding gas cylinder valves

- All BOC cylinders are fitted with a valve. The cylinder valve allows gas to be transferred into and out of the cylinder.
- For safety reasons, flammable gases and non-flammable gases have their cylinder valve outlets threaded opposite hand. This prevents the connection of the incorrect regulator to cylinder valve outlets.
- Valve outlets for flammable gases are turned LEFT-HAND or anti-clockwise to tighten.
- Valve outlets for non-flammable gases are turned RIGHT-HAND or clockwise to tighten.
- Do not tamper with, attempt to maintain or remove a cylinder valve.  This can only be done at a certified cylinder test station.