If any control valve create hunting problem, what is the
possible reason and solution?

Answer Posted / s.k.bakshi

1. First check the positioner air supply and the positioner.
2. If problem persists tune the PID.

Is This Answer Correct ?    8 Yes 7 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

What are the uses of orifice plates?

619


what are the definitions of input, output, command & signal according to instruments controlled by PLC using DCS System?

1632


Displace type LT to be calibrated in workshop, wt. 40, dia- 60 mm, density- 0.8kg/cm3.

1438


Calibration procedure for electro magnetic flow meter

1536


Name different parts of a pressure gauge. Explain the use of hair spring in the pressure gauge.

669






How does your previous experience relate to the job you are applying for ?

1558


Explain PID, ON/OFF, Controls

1584


why we use the ac supply load cell>?can we use the dc supply load cell?advantages and disadvantage of the ac supply load cell?

5884


If relative y axis vibration sensor is by passed, and relative x axis and absolute sensor is left working. how much monitoring i would have risked?

1029


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

1734


Calculate the maximum pressure drop that can be allowed to occur across a control valve, so that we can prevent cavitation / flashing from occurring. Use the following formula: Δ P allow = Km (P1 – PvapourA) where, Δ P allow - the maximum allowable differential pressure for sizing purposes, or terminal pressure drop; Km- the valve recovery coefficient from the manufacturer’s catalogue; P1 - absolute inlet fluid pressure; PvapourA - absolute fluid vapour pressure at the inlet temperature; Use Atmospheric pressure = 101.3 kPa, P1 = 1200 kPa(g), PvapourA = 4 kPa, KM = 0.72

1652


this site is owned by an nonsense

1762


What are different types of orifice plates?

632


what is wave length were using ?

1478


WHAT IS TMXT IN TEMPERATURE FOUNDATION FIELDBUS.

1870