Potential Gas Leak from Poorly Seating Gas Regulators on Cylinders

42. (2005):

There are apparently some older style inert gas cylinders still around campus (and the region) being circulated.  These inert gas cylinders (eg. argon) have a MULLER cylinder value (see photo below), with a 11 mm star shaped hole.  A large leak may develop because the regulator ‘o’-ring fails to cover the hole, thus allowing gas to escape around the thread.
BOC gases is aware of the problem (poor design), and all such cylinders were supposed to have been withdrawn from service.
All gas cylinders fitted with a MULLER value (with large star shaped hole) should be returned to the supplier.
Use of these gas cylinders may lead to an asphyxiation hazard, and rapid consumption of gas.