Explain Split Range Control In Control Valve Briefly.
- 5 Answers
- 28255 Views
- I also Faced
- E-Mail Answers
Answer Posted / www.islamqa.com
perfect answer sam as usual
and if there is something else to say I can say that split
range control ( or call valve sequencing ) is a technique
used for satisfy the procsee requirements.
Actually we have techniques and modes for this strategy.
The used techniques to achieve valve split
ranging /sequencing are:
1 - Valve bench set adjustment (modify the valve itself)
2 - Positioner adjustment
3 - I/P adjustment
4 - Using 1 controller with 1 I/P and 2 adjusted valves
and this is very slow process as we have to wait a long
time till the pressure is built up witin the loop.
5 - using 1 controller with 2 series I/P
and here we face the risk of voltage drop.
6 - using 1 controller with dual o/p.
7 - using 2 controller with the same input.
# And we have 3 main modes for this strategy:
1 - COMPLEMENTARY:
where 1 of 2 valves opening is opposite to the other
@ 4 ma valve-A is fully open while valve-B is fully closed
and thier stems move synchronously.
2 - EXCLUSSIVE
3 - PROGRESSIVE
Ahmed Sabry
Control and Instrumentation Engineer
GPC - General Petroleum Company
ahmedsabry.online@gmail.com
CELL.: 00 2 0121367310
| Is This Answer Correct ? | 6 Yes | 2 No |
Post New Answer View All Answers
What are primary elements of measuring pressure?
why micro controller 8051/52's clock frequency is internally divide by 12 ?? and why it is further divide by 32 in UART serial communication ??
sir i m preparing for BARC but i am not getting any papers to prepare for this exam so please send me some sample papers to my i.d for the preparation of barc.
how many type conductivity sensor ?
what is the procedure of O2 sensor(ABB) calibration?
Give an example where you had aproblem on the job, and tell me how you solved the problem. and the finalvoutcome.
need to calculate flow rate with the help of dp range and orifice bore dia and size. range is 0 to 400 inwc and orifice size is 12 inch 150 # rf and bore dia is 7.180 inch. need to calculation for flow rate
what is interface level measurement.who can calibrate interface level measurement transmitter online
i have been asked by QAFCO to appear for interview for thy post of Instrument Designer(INTOOLS)..i m engineering graduate with 5 years exp. in design engineering.Will this job profile suit me??i need all ur help n suggestions for thy same?
How to Calibrate Ultrasonic Level Transmitter in field
in differential pressure transmitter,min&max pressure range for hp&lp
any questions on motor and energy conversions machines?
what is moisture probe? What are there types? What is there working principle and how they works? guys this is one of technical question I had ask in interview. If you know its answer please let me know. The interviewers were more interested in microwave moisture probe, so if you find its any link please just forward me on my mail id.avinash1200@gmail.com Thanks in advance.
Turbidity analyzer working principle ?
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 =
