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Designed for engineers, the JVCV is a valve sizing program that has been developed to help you quickly and accurately determine the flow coefficient of. In this InfoTec, we will show how to calculate the heat load for any walkin box. First, well cover the long way. The long way allows you to calculate the. Control valve positioner. Control valve positioner. I would like to know the operation of positioner. Hi, I am a fresher and just joined Essar, would like to know the operation of positioner. Like 4 to 2. 0 milli amps is converted to 3 to 1. PSI by IP. this 3 to 1. I would like to know the exact working as I am into projects. 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 IP converter only sends the openingclosing 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. IP 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 IP converter output range. In recent days software configurable digital positioner are being used in valves which do not require IP converter and has many features like advanced valve diagnostics, partial stroke testing, remote communication etc. Resources/Assets/fig%209.4.3.jpg' alt='Control Valve Sizing Software Online' title='Control Valve Sizing Software Online' />Dear Hemanth,Without you knowing the concept of Postioner, who selected you in ESSAR Pls return to your college and study once again and join. Control Consultants, Inc. CCI is a building controls distributor. Through our online store and Bostonarea showroom. At Control Consultants, Inc. CCI, our single. Products Ballvalves Control Valves. The FW4700 series valve 60 V full port characterized ball, 3piece carbon or stainless steel body, 316SS ball and stem, 15. A book that effectively tackles the complex subject of pneumatics, by explaining the underlying operating principles and function of components and systems for all. I think it would be better for you. MRBye. Dear Mr. Anonymous person,Nobody knows everything even if it is basicsIf some body needs to go back to college, if heshe does not know a basic concept, then everybody will be sitting in college. What is really required, is only the attitude,to learn and keep learning. Dear Mr. Anonymous person,you are right with your question i learn detail about the positioner usally i use to only calibrate now i know the detail thankyou please do share your knowledge and problem you face during calibration i will love to read it. A valve positioner is a device which exactly positions a control valve to the required position as per the signal given to it. For example, if a process change requires the valve to openclose a further 1. Due to factors like valve friction, static pressure, etc., stem may assume only a 7 or 8 change in its position and thereby, an error in control. Whereas in case of a valve with a positioner, the signal from the controller is given to the positioner. The positioner then compares it with current valve position and gives an output suitable to the valve diaphragm until the desired position is achieved. The output from the positioner stabilizes when the desired position signal matches feedback from valve stem is achieved. In short, a valve with positioner means a closed loop control with feedback and without it means an open loop control. Thanks for infocould you please inform me in this case we dont need any actuator and positioner is complete and assembled on valve thats mean valve positioner worked as control valve. Thanks, Well Explained Thanks Again. I stumbled upon this website in search of some knowledge, and I just want to thank you for your explanation. It helped to find the equivalent in my language. Dear Sir thanks a lot for your valuable explanation. Sir,I have a doubt. Suppose a control valve with a pneumatic positioner receives instrument signal from an IP. If the I to P is disturbed. Then which is the better way1 To Calibrate the IP with a master gauge separately and then calibrate the positioner Or 2 calibrate the positioner first and then calibrate the I to P with respect to the positioner. Please give me a reply. Consider this, please. How To Install Gpu Drivers On Ubuntu Software. I see much very informed advice in this thread, but if you will indulge me a moment, I would like to take you back to some more basic elements of setting up a valve positioner. First of all, set up the basic vv and positioner alignment mechanical alignment and stroke length for the given vv. The safest way to do this is to disable the positioners ability to control the valve, by removing its supply air and output tubing. Connect a regulated air supply directly to the diaphragm of the valve. Slowly increase the air feed until the vv is at 5. Do not exceed the stated max working pressure for the diaphragmNext, check the data plate on the valve for its stroke length. This figure will be used when setting up the Stem coupling drive pin on the positioners feedback arm graduated scalefor example, it is typically given on a Kent P3. X mm, in multiples of 1. With the vv still in mid position, carefully align the positioner feedback arm as horizontal as you can judge it to be, and engage the drive pin in the feeback arm slot, setting it at the required figure derived from the data plate. Tighten the stem coupling arm, use a suitably sized spanner to counter the movement of the stem coupling arm as you finally tighten up. Finally, check the following a that the vv stem is still at mid position,b that the positioner feedback arm is horizontalc that the drive pin is still located in the feedback arm drive slot at the required length as above. Basic alignment is now complete, and you may remove the regulator and tubing which you used, and re instate the positioner air supply and output tubing to its original set up. Next, check and adjust I to P calibration. Finally, calibrate the positioner to your requirements, assuming full range linear application, a 4 to 2. A input producing 0 to 1. Check performancelinearity and repeatability in 2. Bingo. job done,with all sources of error having been eliminated. The short of it is, that the more accurately you set up the individual components, then the more accurate will be the overall result. Hope this is of help to you Nice explanation, except that for some positioners like Fisher, the feedback arm is line up to the travel mark of the arm when the valve is fully open or close. Plastic alignment pin has to be inserted fist if you are doing it as per the book. You must calibrate the IP converter so that there is 1 to 1 relationship between input and output. If IP is disturbed and you calibrate the control valve, you may solve the problem temporarily, but your colleagues successor may not know what you have done and he may have to re calibrate the valve again if he go for change of IP converter. A positioner without IP converter is known as HART Please give me some idea how it works. Not necessarily, although most analog inputoutput positioners now have HART communications. Unless they have Profibus, or Foundation fieldbus. Look up HART, Profibus and Foundation fieldbus on Google for more information. Its all there, in copious quantity. You might also look up the manufacturer and model number of the positioned in question. Their websites usually have more information on their products than you can possibly absorb. Best,Walt. Walt Boyes, FInst. MC, Chartered Measurement and Control Technologist. Life Fellow, International Society of Automation. Editor in Chief, Control and Control. Global. comwboyesputman. Sir,can you please explain me the difference between positioner and actuator. And when to go for an actuator and when to go far a positioner Whether actuator can completely replace positioner Valve Body with plug is installed in the process line. That plug is operated updown or in angular position by actuator.