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Subject: drawing of the valve Пожалуйста, помогите перевести drawing of the valve.Выражение встречается в следующем контексте:
- PIPE WASHING
Almost all drawing of the valves is due to soldering burrs or foreign bodies lodged between the valve and
the shutter, often causing damage to these.
To avoid this pre- filters should be included on the valve.
The pipes should also be carefully washed, by setting the valve at half run, during the first start up of the
plant and after long periods of lack of activity. The servo controlled valves are equipped with a manual command
on the servo command that allows them to be positioned without power being supplied.
Заранее спасибо
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