Notice on Ticking Gauges in BOC Cylinders with Check Valves

We have identified issues with BOC cylinder check valves when used with RA machines, leading to symptoms such as ticking gauges, resonating noises, and regulator chirps. To ensure optimal operation and safety, please follow these recommendations:

  • Remove Affected Cylinders: Should you experience any of the mentioned issues, remove and cease using the affected cylinder.
  • Report to BOC: Label the problem cylinder and inform BOC customer service to arrange for a replacement.


BOC is aware of these concerns, which primarily affect older models of check valve cylinders. (valve outlet)

Images are for reference only. This does not highlight a faulty cylinder.