Self-balancing water-seal fire-retardant explosion venting device for transporting methane gas by pipeline

The utility model relates to the technical field of methane gas pump drainage equipment, in particular to a self-balancing water-seal fire-retardant explosion venting device for transporting methane gas by a pipeline. The device comprises a water seal cylinder body and a steam separation cylinder body; a gas inlet I and an exhaust port I are respectively formed on two sides of the water seal cylinder body; a gas inlet II and an exhaust port II are respectively formed on two sides of the steam separation cylinder body; the exhaust port I is fixedly connected with the gas inlet II; a water level automatic control device is arranged on the water seal cylinder body; a primary flaring speed reduction device and a secondary flaring speed reduction device are sequentially arranged between the gas inlet I and the exhaust port I of the water seal cylinder body; and a forced flow guiding plate is arranged in the steam separation cylinder body. The device has the advantages that the structure is reasonable, and the wate