A pressure reducer is a regulating device that reduces high-pressure gas to low-pressure gas and maintains stable pressure and flow rate of the output gas. Due to the high pressure inside the gas cylinder, while the pressure required for gas welding, gas cutting, and usage points is relatively low, it is necessary to use a pressure reducer to reduce the high pressure gas stored in the gas cylinder to low-pressure gas, and ensure that the required working pressure remains stable from beginning to end.
　　
The working principle is shown in the following figure: