Answer / bhargav purohit

Hi,
I think your question has it self an answer. Your valve is Air fail to close. Means if there is no Control Air/signal, your valve will be closed .

In running plant condition, Position of valve could be anything according to process.( Fail to open or close depends on process requirement)

Suppose you want maintain a Tank level and safe condition is full tank, then..
1> if you are maintaining level by inlet water flow to tank, your valve should be Fail to open. Means in case of signal failure your valve will open and fill the tank (Safe condition)

2>If you are maintaining level by output flow, then you should select fail to close vale. So in case of failure of control signal, output flow will be closed and tank will be full.

Regards,
Bhargav Purohit

Answer / rajesh.kon

need answer ASAP

Lube oil pressure transmitter local it's showing 9.8 kg/cm2 but dcs side it's showing 9.26 like that what is the reason?

3 Answers   Edac,

---

An engineering term STALL used in compressor operation what it means?

1 Answers  

---

should I use Hydrostatic Pressure Transmitter for measurement of DENSITY of filled tank ? If YES then please explain how.

2 Answers   HPCL,

---

How a oxygen sensor & analyzer work at boiler or furnace, what’s the principle & science is beyond this, How O2 sensor scene & convert signal & move toward analyzer & analyzer show reading in percent?

1 Answers   GS Engineering Construction, KNIC,

---

Induction type 1-p wattmeter reads ….. a) true value b) apparent value c)volt ampere value

3 Answers   Engineers India Limited,

---

---

what is pressure control

1 Answers   GNFC, IBM, Privi Organics,

---

What is the basic difference between 2 Wire, 3 Wire and 4 Wire RTD

2 Answers  

---

what is the best method to measuring level in high pressure and temperture thank?

4 Answers  

---

How RAL(Rotary air lock)works in cement industry?

0 Answers   Jaypee,

---

what is difference between E/P positioner and I/P positioner. Why E/P fixed in below actuator and why I/P fixed in other place

1 Answers  

---

I want condensate pots vent position erection of flow transmitter ?

1 Answers  

---

give eg of how I/P is used in control loops

0 Answers   CEPC,

---