| 摘要 |
FIELD: oil industry. ^ SUBSTANCE: device has housing, shaft, anchor, electromagnetic coil, mounted inside the housing, and spring-loaded hollow rod whose bottom part is nonmagnetic. The electromagnetic coil is energized via a cable passing through the cable-sealing opening. The contact rod is provided with valves. The seat of the valves is mounted inside the housing. ^ EFFECT: enhanced operation capabilities. ^ 1 dwg |
