how to check control valve was passing?how to check online?
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Answer / satya
give 100 % close command to cotrol valve if u phsically check valve is 100 % close the open the downstream drain valve if proces fluid comes then valve is passinf . if theie is flow transmitter before cv u can also check
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Answer / harsh mehta
by zeigler nicols method,,,,,,we can do tht,bro
| Is This Answer Correct ? | 2 Yes | 13 No |
generally transmitter power supply having some range(12v to 35v) but the out put(4-20 mA) must same for given input.If we vary the power supply voltage then output mA also to be change according to V=IR. Is there any voltage regulator in the transmitter ?
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In control valve there are two type of valve seat we can use metal to metal seat & soft seat.On this valve seat i have following doubt. 1)I have never seen practically the internal assembly of valve so my doubt is that basically weather the seat is soft seat or metal its basic MOC is same as valve body(SS or CS) only in soft seat we are using PTFE ring & place on valve seat & in metal this PTFE ring is not threr am i correct??????? 2)what are the common general rule for using metal to metal seat & soft seat,means its depend on process parameter like liquid,gas, steam & on valve leakage class.
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2 Answers KazStroy Engineering, PSU,
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