The utility model relates to a drainage equipment is salvageed to the gas pipeline, and concretely relates to is used for gas user inlet tube to sweep the gas sweeps row of piles hydrophone of stake department. Including hollow support cover, adjusting lever, inflation cover, the adjusting lever is hollow structure, and the adjusting lever includes extension section, linkage segment and the tight section that expands that the internal diameter reduces in proper order, and the tip of the tight section that expands is equipped with anti retreat nut, support on the ways locates the extension section and linkage segment of adjusting lever, and the tip of adjusting lever extension section expose in support overlap outside, inflation cover locate on the outer circumference of the tight section that expands and lie in anti retreat nut with support overlap between, the extension section tip of adjusting lever still is equipped with the valve. The shutoff of stake can be realized sweeping by this drainer, and can the fast switch over sweeps stake and external intercommunication and separation state, requirements such as convenient and fast when satisfying the drainage operation completely, improvement work efficiency.