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English Translations » 【仪表自控交流圈】 » What is the difference between oil-driven valves and pneumat

What is the difference between oil-driven valves and pneumatic valves?

2018-10-26View Original

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What is the difference between oil-driven valves and pneumatic valves? Why are some PSA programmable valves actuated by oil while others are actuated by air? What is the difference?
Reply #22018-10-26
The oil-driven type should be hydraulic; hydraulics can provide higher pressure to operate large-diameter valves. Pneumatic valves generally have a maximum pressure of around 8 kilograms, which can be insufficient in some applications.
Reply #32018-10-26
Is it mainly distinguished based on driving pressure? Is this difference in driving pressure caused by the pressure difference in the pipelines before and after the valve?
Reply #42018-10-26
It is related to the pressure difference before and after, and of course it is also related to the diameter. In short, I think it comes down to the magnitude of the driving torque. The valve factory calculates this torque, and then determines whether pneumatic or hydraulic power is more suitable.
Reply #52018-10-26
The main considerations are the driving torque (related to diameter, pressure difference, valve structure, etc.) and the operating speed (hydraulics enable fast operation of large-diameter valves); a choice is made after taking these factors into account.
Reply #62018-10-26
PSA programmable valves must never use hydraulic actuators; such actuators often cause severe leaks, resulting in a mess of dirty oil all over the area! ! !
Reply #72018-10-26
Of our four sets of PSA units, two are oil-powered; now a large oil collection box is placed under each valve.;P
Reply #82018-10-27
When choosing between oil-driven and pneumatic systems, local climate conditions need to be taken into account. Since there is a small amount of water vapor in the gas source, it may freeze in winter and cause blockages in the gas supply pipes; this has happened with our PSA units as well. Oil-driven systems can avoid similar situations.
Reply #92018-10-29
So, what is the main factor behind choosing between these two types of valves – pneumatic and hydraulic? Is it the pressure difference? But it doesn’t seem that high in cost, does it? Or the speed of movement? Or reliability

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Translated at 2026-07-21 02:35:30

Original: https://bbs.hcbbs.com/thread-2118429-1-1.html

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