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What is the difference between Pressure Safety Valve and
Pressure Relieve Valve, in what condition we prefer choose
Pressure Safety Valve rather than Pressure Relieve Valve?
and vice versa
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Answer Posted / abhishekk
pressure safety valve is automatic relieves the static
pressure on a gas..usually it opens completelly ..while
relief valve relieve the static pressure in a liquid filled
,its opens proportionally with increasing pressure...
PSV is used in case of gas and PRV is used in liquid.
| Is This Answer Correct ? | 29 Yes | 3 No |
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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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