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if we open the inlet of an air regulator ,how it will affect
the out put of regulator? (out put of regulator is using to
operate an on-off valve.it is an air to open valve,and valve
is in open position.my doubt is air regulator will hold the
valve in open or not,if there is no consumption or leak in
regulator out put side ,we only loose the input pressure.)
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Answer Posted / girish.bashyam
Regulator is just for regulating the air supply . this air
supply will be regulated as per the name plate detail of
control valve. the output of AFR will go to positioner and
its output will go to diaphragm. Depends on the mA the
flapper will be moving and accordindly the output of
positioner will vary its outputis connected to diaphragm
which will move from 0 to 100% respective of the command.due
to flapper movenment the required air to move the diaphragm
only provide to diaphragm for its movenment.
| Is This Answer Correct ? | 2 Yes | 5 No |
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What is Cavitation in a control valve?
Q1: Consider part of a control loop, which excludes the transmitter, consisting of a process, a controller and a control valve which may be represented by two dead times of 0.5 min each and three exponential lags of 0.8 min., 1.0 min. and 1.5 min. respectively. We wish to express this system as an overall first order plus dead time (FOPLD) model ie gain, time constant and process dead time. (We will see later that this is often done, to simplify controller tuning). For this exercise, gain is considered to be 1.0. (A) If the transmitter is a flow transmitter whose behaviour can be described by a dead time of 0.2 min. and an exponential lag of 0.5 min. in terms of the overall dead time and overall first order lag how can the system behaviour be approximated ? Overall dead time = Overall time constant = (B) If the transmitter is a temperature transmitter with a temperature sensor in a protecting well whose behaviour can be described by a dead time of 0.7 min. and an exponential lag of 15 min. how can the overall system behaviour be approximated now? Overall dead time = Overall time constant =
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