Answer / jigaranadkat

There can be may issues :

1) Very first indication is that your plug and seat are having some foreign particles or uneven surface which is restricting the valve for initial opening.
2) Check the springs of the actuator for any crack as when pressure is increased it lifts the valve.
3) Check for positioner relay.

Answer / smith

which type of positioner you are using?. it depends on the positioner. try to tune it correct manner you will get the output.

Answer / praveen kumar

first decoupled the actuator then ensure and mark on the stem of full opening and closing, then couple the actuator stem and plug on fully 100 % open of marking position. finally to ensure zero passing test.just close the control valve and fil the water on bonnet inlet.same passing tht u feel means place the nut or iron piece something inb/w the coupling.then ensure again on zero passing test.if again feel the passing means pls to do lapping on seating...then take an trail.

What is the principle of a Pressure gauge?

2 Answers   CCIE,

---

what sud u do if u dont get feedback from control valve?

1 Answers   Siemens,

---

what is the well head protection system?

1 Answers  

---

What are different types of control valves?

0 Answers  

---

What is the difference between local indicator(flow) and flow indicator?

2 Answers  

---

---

What is the difference between HMI and Scada?

4 Answers   Schneider,

---

Why trim span ? How?

0 Answers  

---

what is cems analyzer explain with principle and drawing ?

0 Answers  

---

what do u mean by 2/3 soleniod valves?

8 Answers   Nile Sugar,

---

What is the loop calibration? Which instrument used to loop calibration and how?

2 Answers   Descon, QCon,

---

plz send me general of ongc

0 Answers   ONGC,

---

how we can calibrate level transmiiter in field?

6 Answers  

---