Device for gas piping liquid seal

The utility model provides a device for gas piping liquid seal, including conveyer pipe, branch pipe, spring, sealed bucket, bellows, water tank, piston, gas holder, its characterized in that: the conveyer pipe bottom is provided with the branch pipe, branch pipe outer wall upper portion is provided with the fixed block, the sealed bucket of spring coupling is passed through to the fixed block lower part, it is provided with the retaining ring to prop up the inside pipe wall, the retaining ring lower part is provided with the piston, the piston bottom approaches the end through spring coupling, install in sealed barrel head portion at the thin end, branch pipe outer wall lower part is provided with the sealing ring, sealed bucket inner wall upper portion is provided with the flange, sealed barrel head portion is through the bellows joint water tank, water tank upper portion is connected with the gas holder, this equipment structure is rationally normal, and convenient for operation, can effectually carry out the liquid seal to gas piping, form when the pipeline that high pressure energy is effectual in the twinkling of an eye collects the leading-in gas holder of coal gas so that handle later on to coal gas.