【Interview Question】For a control valve with a diameter of DN100 and a pressure difference of 100 kPa, how should it be selected?
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【Interview Question】For a control valve used in pneumatic systems, with a diameter of DN100, a pressure difference of 100 kPa (or higher), operating at normal temperature and with ordinary liquid media, what type of control valve should be chosen? I couldn’t answer the questions asked in today’s interview; I’d like to ask for your advice.
For single-seat valves (i.e., GLOBE valves), the type – top-guided or cage-type – is determined based on the pressure rating.
What position are you interviewing for? Is there also a test on the selection of control valves?
The question itself is also not precise, unless it is intentional on the part of the examiner; in such cases several scenarios need to be considered.
It’s the most ordinary control valve ever. . . .
If there’s no operating pressure at all, then what valve should be used?
In fact, the examiner is already quite lenient – they just want to see if you have made a selection decision and whether you have some understanding or experience with control valves. Basically, any valve can be chosen. For the lowest-priced butterfly valves, if the pressure difference is greater, choose single-seat, ball, or sleeve valves.
This post was last edited by tuzidiandeng on 2017-12-29 09:44. No very specific conditions were provided, so you need to make different choices based on various operating conditions and avoid certain problems. It depends on your familiarity with control valves and relevant standards.
It’s just a routine interview; when faced with something like this, I usually just say a few words perfunctorily and leave.