Catalina Cylinders recommends the following procedure for the valving of oxygen cylinders.

  1. Verify that the cylinder was manufactured for oxygen service. Cylinders which have been manufactured for oxygen service by Catalina Cylinders will have an "O" with a "2" inside the "O" stamped on the crown of the cylinder.
  2. 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.
  3. Inspect the cylinder threads and the cylinder internally verifying that the cylinder is free from any lubricants and contaminants. Do not proceed it you feel the cylinder may be contaminated.
  4. Catalina Cylinders recommends the insertion of a new teflon o-ring every time the valve of a cylinder is removed and to be re-installed. Verify that the teflon o-ring is free of lubricants and damage.
  5. Catalina Cylinders has found it easiest to place the teflon o-ring in the o-ring gland of the cylinder and then insert the valve into cylinder tightening the valve hand tight.
  6. Final tightening should be done with a calibrated torque wrench to the recommended torque  of 75 lbf-ft.
  7. Close the valve with no more than 1 lbf-ft torque.
  8. 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.
  9. 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.
  10. Always verify that the cylinder is empty prior to attempting to replace the safety device of a valve.