Valving Industrial Gas Cylinders

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Technical Support Document

Recommended Procedure for
Valving Industrial Gas Cylinders

November 11, 2005

Catalina Cylinders recommends the following procedure for the valving of industrial gas cylinders.

Inspect the inlet and outlet threads of the valve and the threads and o-ring gland of the cylinder for damage to the threads and o-ring area. If either the valve or cylinder has damage to the threads or the o-ring area, do not insert the valve into the cylinder.

Inspect the cylinder threads and the cylinder internally verifying that the cylinder is free from any lubricants and contaminants. Do not proceed if you feel the cylinder may be contaminated.

Catalina Cylinders recommends the insertion of a new buna-N o-ring when the old o-ring shows any sign of tearing or wear.

Cylinder Thread Designation	Valve Designation	Buna-N O-ring Size
1.125 - 12 UNF	CGA 580	216

Catalina Cylinders has found it easiest to place the o-ring on the valve and then insert the valve into the cylinder tightening the valve hand tight.

Final tightening of the valve should be done with a calibrated torque wrench to the recommended torque value noted below:

Do not tamper with the safety device of the valve. The safety device of the valve should be rated at the test pressure of the cylinder.

Whenever replacing the safety device of a valve, Catalina Cylinders recommends that you always replace the safety device with a complete new safety device assembly.

Always verify that the cylinder is empty prior to attempting to replace the safety device of a valve.

Catalina Cylinders - West
Corporate Headquarters
7300 Anaconda Avenue
Garden Grove, California 92841 USA
Phone: (714) 890-0999
Fax: (714) 890-1744

Catalina Cylinders - East
Cliff Impact Division
2400 Aluminum Avenue
Hampton, Virginia 23661 USA
Phone: (757) 896-9100
Fax: (757) 896-9143