The invention discloses a
plunger-type double-passage different-direction synchronous joint control
check valve for a double-layer continuous oil
pipe, which is arranged between the double-layer oil
pipe pipelines. The
plunger-type double-passage different-direction synchronous joint control
check valve comprises a
left valve body, a right valve body, an inner passage
piston, an inner passage
piston seat, an outer passage
piston, an outer passage piston seat, a long pin, a crossing
plunger, a slide block, an inner passage piston return spring, an outer passage piston return spring and a slide block return spring. According to the plunger-type double-passage different-direction synchronous joint control
check valve, the parts such as the piston, the return spring, the movable slide block and the like are simultaneously and additionally installed in the inner layer and the outer layer of continuous oil
pipe passages, a different-direction synchronous joint control design scheme is adopted, a double-passage different-direction joint control check valve device is formed, so that when accidents happen, the passages of the inner and the outer continuous oil pipes are effectively sealed, the return of the well liquid is prevented, and the blowout is prevented.