Reusing of used 12-gram carbon dioxide cylinder with e.g. soda machines, or fire extinguishers, involves attaching one-way valve to the cylinder with filling device

摘要

Used 12-gram carbon dioxide cylinder is reused by attaching a one-way valve to the cylinder with a filling device. The valve enables the cylinder to be refilled with liquidized carbon dioxide several times. The cylinder can be used as a newly manufactured cylinder and sold to customers.