what is the meaning of reverse action and forward action of
control valve...
- 9 Answers
- 31563 Views
- Honeywell, Yokogawa, I also Faced
- E-Mail Answers
Answer Posted / vinayak
Hi ...
Revese action normally used in AIR Fail to Close valve.
Direct acttion normally used for Fail Open valve.
It is very important to define reverse or direct action as
per process requirement.
DIRECT ACTION :
20 MA DC = 0 % VALVE CLOSE
16 MA DC = 25 % VALVE OPEN
12 MA DC = 50 % VALVE OPEN
8 MA DC = 75 % VALVE OPEN
4 MA DC = 100 % VALVE OPEN
REVERSE ACTION :
4 MA DC = 0 % VALVE CLOSE
8 MA DC = 25 % VALVE OPEN
12 MA DC = 50 % VALVE OPEN
16 MA DC = 75 % VALVE OPEN
20 MA DC = 100 % VALVE OPEN
| Is This Answer Correct ? | 8 Yes | 11 No |
Post New Answer View All Answers
any one can send me instrumentation previous interview papers? I prepare for MNC Company Interviews? my mail id- Rakesh.Golla@dodsaldxb.ae , and another mail rakesh.gvk@gmail.com
Can Any body tell me about the Contact or Email id of any good Consultancy which help me to find a job in Instrumentation Field in India .I have Six years of Work Experience in the Same field.Please revert me back on shammi_gwalior@yahoo.com ?
What is standard procedure of manual mapping in Radar type level transmitter?
KAlman filter code for two dimension?
What are the materials available to prepare individually for competetive exams in Instrumentation field? Plz reply...
we are using centum vp as monitoring with Dell precision work station T3600 but some times PC(s) are restarted automatically . how we can solve this problem? thanks
List three types Level Switches with their working principles
SOME OF YOUR QUESTIONS ARE NOT MAKING ANY SENSE SO TRY AND PUT IN A LITTLE BIT MORE EFFORT BEFORE YOU POST A QUESTION. WE WILL ONLY HELP THOSE WHO WE CAN SEE ARE TRYING TO HELP THEMSELVES.
Is it ok, to use non-contact type Radar type LT, on a tank that is half circular from the bottom side? If yes the, isn't the waves gonna bent in other directions?
Q- Control problem are mainly classified in _____ types. a-)4 b-)3 c-)6 d-)nono of these Few of them i know is 1- regulator type problem (eg- Air conditioner) 2- tracking problem (eg missile trcking problem) 3- sybernatics 4- optimal control problem
What is the difference between mmwc and mmwg?
What is the use of GMV in turbine?
Tell me the field calibration procedure step by step with diagram of pressure gauge, pressure switch, pressure transmitter, temperature switch, level switch, flow switch, flow transmitter.
How to calibrate radar type level transmitter for interface level? Total liquid(liq.1 and liq.2), level both the liq individually? For. Both the liquid levels how the signal will go from transmitter to dcs? How to calibrate. Single radar 9:26:55 AM for 2 different liquids in a tank?
principle of dead weight tester ?
