Interested to Buy Any Domain ? << Click Here >> for more details...
What is the function of positioner in control valves? does the control valve operate without positioner?
- 3 Answers
- 5308 Views
- Hofincons, I also Faced
- E-Mail Answers
Answer Posted / someone
No...valve can only be used as on/off purpose..not for control without positioner.
A positioner is a device put into a valve to ensure that it is at a correct position of opening as per the control signal. An I/P converter only sends the opening/closing request to valve but can not confirm its position.
Positioner senses the valve opening through a position feedback link connected to valve stem which is its input signal. I/P converter output is its setpoint input. The difference between these two is the error signal based on which the positioner positions the valve to correct position to reduce error to zero. Hence positioner is nothing but a pneumatic feedback controller. Controlled external supply air to positioner provides power to positioner to position a valve. Also positioner is used in a valve when valve operating signal range is different from I/P converter output range.
In recent days software configurable digital positioner are being used in valves which do not require I/P converter and has many features like advanced valve diagnostics, partial stroke testing, remote communication etc.
| Is This Answer Correct ? | 7 Yes | 1 No |
Post New Answer View All Answers
Explain the key components of control loop?
How is PH sensor works ?
what is the difference between magnetic flow meter and mass flowmeter
Basically iam Instruemntation Engineer, but Iam interested in Instruments design engineering, so plz guide, is there any course, training or Softwres to become Instrument design engineer??.
What do you know about gail?
please any body have most important data for study for saudi aramco test of instrument QC thanks email shahnaveedullah@gmail.com
PT RTD Range: -200 to 500 degree celsius If I configured in DCS Lower range and Upper range . In face plate it shows red colour due to overa range how was the characteristics look If the temperature is more than operating range. how was the characteristics look . whether its in Resistance vs Temperature curve is Linear or Non linear
Instrument QA/Qc what is the project quality plan?conduit inspection RFI. which documents attache with package?
Define cryogenic?
any body please send me the old question papers of ongc test.
Emergency Shutdown Systems/ Plant Shutdown System.
which type of signal used in instrument?
Why all the drains(Gland sealing,ESV,Casing inlet etc) are directly connected to the flash tank instead of hotwell of the condensor in the power plant? My Email Id:naba02222@gmail.com
how to control pid
what is thermo coupler and how it works
