Attach a shut-off valve to the regulator outlet or Shut the valves on the cutting torch.
Open the cylinder valve slowly
Fully engage the acetylene control knob by turning it fully inwards (maximum pressure/flow)
Observe the pressure reading on the acetylene delivery gauge.
The needle must not exceed 150KPa (or enter the red zone). If it does, immediately remove the regulator and notify the manufacturer and/or distributor of the faulty regulator.
Should the reading be below 140KPa, the product is still faulty and may not be able to deliver sufficient gas for large cutting requirements. This would be a quality/performance issue and not a safety issue.
The incidence of high outlet pressure is extremely serious due to the catastrophic life-threatening consequences and manufacturers and/or distributors should immediately recall all suspect batches of acetylene regulators. Some would argue that one such faulty regulator is one too many. Failure rates greater than 0.2% would require definitive responses by the manufacturer and/or distributor of the product. Customer should remove all regulators of the affected brand of regulator and notify the supplier.