suction operation venting (насос) gen.

[Vickyvicks]

Помогите перевести сочетание suction operation venting в данном предложении:
Before the pump is started up, it and the pipes must be vented and filled with the liquid to be pumped. In the case of both gravity feed and suction operation venting must be carried out via the hole on the up per suction elbow. In the case of suction operation the pump must additionally be evacuated (a vacuum must be created). Спасибо!

[Greso]

Здесь это отнюдь не словосочетание. Читать так:
In the case of both gravity feed and suction operation
venting must be carried out
via the hole on the up per suction elbow.

[Vickyvicks]

Аааа, да-да! Тогда это понятнее... То-то я думаю, спать пора идти! Спасибо)