（1） The use of gas cylinders
Install the matching pressure reducing valve on the steel cylinder.
Open the main valve of the steel cylinder, and the high-pressure gauge will display the total pressure of the gas stored in the cylinder.
Slowly turn the pressure regulating handle clockwise until the low-pressure gauge shows the required pressure for the experiment.
When stopping use, close the main valve first, wait for the remaining gas in the pressure reducing valve to escape, and then close the pressure reducing valve.
Steel cylinders should be stored in a cool, dry, and away from heat sources. Combustible gas cylinders should be stored separately from oxygen cylinders.
Handle steel cylinders with care and screw on the cylinder cap.
When using, a pressure reducing valve and a pressure gauge should be installed. The valve screws of combustible gas cylinders (such as H2, C2H2, etc.) are reversed threads; Non combustible or combustible gas cylinders (such as N2, O2, etc.) are positive filaments. Various pressure gauges should generally not be mixed.
Do not allow oil or flammable organic substances to contaminate the gas cylinder (especially the cylinder outlet and pressure gauge).
When opening the main valve, do not face your head or body directly towards the main valve to prevent injury from the valve or pressure gauge rushing out.
Do not use up all the gas in the cylinder to prevent danger during refilling.
Gas cylinders in use should be inspected every three years, and steel cylinders containing corrosive gases should be inspected every two years. Gas cylinders that do not meet the standards should not be used again.