Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / harsh zala
Yes, We can use control valve without a positioner. The
basic purpose of positioner is to supply required punemetic
air w.r.t 4-20 mA standard signal, you can say for example
3.2 kg/cm2 to 4 kg/cm2. and it also checks for the
appropriate vavle opening(feedback) and stops air supply
going to valve actuator.
Without Positiner we can use control valve,but we must have
i/p converter, which generally converts 4-20 mA signal to
0.2 -1 kg/cm2, so in that case valve will not opearate
fully . but it will opearate upto certain level.
So when positoner got fail and we dont have new one, and if
we require valve to be controlled upto certain level, we
can use i/p converter,
| Is This Answer Correct ? | 20 Yes | 6 No |
Post New Answer View All Answers
we are having yokogawa centum cs3000 dcs in our power plant. i need some of the operator guides NOT to appear in HIS0163 AND HIS 0162 but it shoul appear in HIS0164 HOW TO DO IT?
need instrumentation job completed 1 year trainee ship in mnc pesticide company. now in search of job
control panel design guidelines
What is difference between Ionization heat and bimetallic heat
1- Explain about HPM 2- What is the FSC and explain the configuration of FSC 3- explain the complete loop of vibration, how it works (field to control room) 4- What is the use of proxymitter? 5- During job your partner effected with H2S then what you have to do. 6- what type of gland packing uses when valve glind is leaking.
We are using Rosemount 5400 series Radar Level Transmitters in all types of Sump Applications having oily water hdrocarbon petrochemical nature. What we are facing the problem frequently is that always getting reading frezzed at some value. If we do power recycling , sometimes it is working . then making same freezing problem. If anybody faced before such type of problem and also having solution , Please give the answer.
what would be the minimum flow rate that we can measure on rotameter..?
What is the main difference between Cavitation and Flashing?
what is actual drum level and compensated drum level?
plz tell me clearly about PID.."when v have to change I value,D value,GAIN??
For crude application in floating roof tank, how to calibrate a DP Transmitter? How is the floating roof weight considered?
Tell about your IFFCO plant visit.
what is use of communication wire in multipare cable(oil and gas field), why this communication wire not used in single pair cable?
How u measure the massflow in orifice flow measurement techniques
Draw bode plot of any transfer function. Why is plotting bode necessary?
