Answer / carl_ellis

What is the purpose of valve positioner. Explain 4 uses.

1) Use supply air pressure to ensure the correct valve
position through feedback control to overcome stiction or
forces on the valve plug.

2) Characterized the non-linear valve movement with respect
to the input signal, for instance, equal percentage or quick
opening

3) Provide position feedback to the control system via
conditioned process signal (4-20ma)

4) Provide adequate seat loading force to ensure tight
shut-off.

Carl Ellis
Measure First

Answer / as

Point No#2 The characterstics of valve for example
liner/equal percentage are defined by valve plug,cage shape
and not by valve positioner.

In a class of 150 students, 40 passed in Social Studies, 90 passed in Science and 30 failed in both the subjects. vi)How many students passed in at most one subject among Science and Social Science?

7 Answers   CAT, CGI, Cipla, KHK, Visa,

---

What is the use of control cable?

0 Answers  

---

What is the full form of PMMC ?

7 Answers   DVC,

---

Pl send the model question paper of mahagenco account officer post

0 Answers   MahaGenco,

---

What is the reverse action and direct action

2 Answers   Samsung,

---

i have been asked by QAFCO to appear for interview for thy post of Instrument Designer(INTOOLS)..i m engineering graduate with 5 years exp. in design engineering.Will this job profile suit me??i need all ur help n suggestions for thy same?

0 Answers   QAFCO,

---

How to do ma trim in massflow meter?

2 Answers   Pakistan Steel,

---

why generation of syncronized generator increases when frequency of grid is less then 50Hz & generation decreases when grid frequency goes up from 50 Hz, as comparision with set value entered in govering panel?

1 Answers  

---

In field side transmitter voltage droping here no loose connection then what will happen?

2 Answers   Edac,

---

What do you do as a Engineering person EPC for Sizing&Selecting Control Valve?

1 Answers  

---

Can anybody explain what is the different between ESD & PLC

1 Answers   ADCO,

---

Punj lloyd is coming in our Jadavpur Universtiy campus for campus placement. Please send me some hints about the writtend exam. My email id is subratafriends@gmail.com

0 Answers   IGL, Punj Lloyd Ltd, Shapoorji Pallonji Group(SPCL),

---