English to Russian Tech/Engineering Mechanics / Mech Engineering устройство газоуплотнительного клапана для загрузочной установки доменной печи

A sealing valve arrangement for a shaft furnace charging installation, said arrangement comprising:
a shutter that cooperates with a valve seat;
a dual-motion shutter-actuating device for moving said shutter between a closed position in sealing contact with the valve seat and an open position remote from the valve seat, said shutter-actuating device being configured to confer to said shutter a superposition of a first rotation about a first axis and a second rotation about a second axis that is substantially parallel and offset with respect to said first axis, said shutter-actuating device comprising:

Наложение первого вращения??? Как-то странно звучит..