The main gas valve is an important element of the biogas reactor. The valve is installed between the main gas-collecting pipeline and the pipeline system. It controls the flow of gas in the whole pipeline system, and must be opened and closed as needed. The valve prevents gas loss due to leaks in pipelines or appliances. With this important role, a leak in the main gas valve is dangerous. A medium-quality valve carries inherent leak risks, so main gas valve used in the reactor system must be of high quality and have approval from IDBP.