Valve for petroleum pipeline and capable of being stably opened and closed

The invention relates to the technical field of pipeline valves, in particular to a valve for a petroleum pipeline and capable of being stably opened and closed. The valve comprises a lower shell, an inlet pipe flange and an outlet pipe flange are fixedly connected to the lower shell, a placement mechanism is arranged on the lower shell, an adjusting mechanism is arranged on the placement mechanism, a butt joint mechanism is arranged on the inlet pipe flange and the outlet pipe flange, the adjusting mechanism and the butt joint mechanism are jointly provided with a sealing mechanism, the inlet pipe flange is provided with a material storage mechanism, and the material storage mechanism is provided with a material adding mechanism. Through cooperation of the sealing mechanism and the butt joint mechanism, the sealing performance between the butt joint mechanism and a valve plate body in the using process is conveniently improved, gaps are prevented from being generated after long-term use, and oil leakage is p