The utility model relates to a pressure regulating device for a
methane tank. According to the pressure adjusting device for the
biogas digester, the effect of treating
biogas can be effectively achieved by arranging the
chemical storage bin and the pressurizing piece, and the situation that the
biogas is directly discharged into the
atmosphere, and consequently the environment is damaged is avoided; meanwhile, when the treated biogas is discharged, the situation that a
human body is damaged can be avoided, and the safety of the biogas in the using process is further improved; through arrangement of an adjusting spring, it can be effectively guaranteed that good supporting force can be provided for a sealing piece in the using process of the biogas; therefore, the effect of sealing or pressure relief of the biogas digester in the biogas digester is achieved. By arranging an adjusting bolt, the effect of adjusting the pressure in the biogas digester in the using process of the biogas digester is ensured, so that the stability of the biogas digester in the using process is ensured.