Single acting ON-OFF valve. it is air to open. when sov energized , valve will b

Single acting ON-OFF valve. it is air to open. when sov energized , valve will be open, so during that if air fail then what will be the condition of valve ( open or close ) ???

Question Posted / neel

4 Answers
4937 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

Single acting ON-OFF valve. it is air to open. when sov energized , valve will be open, so during th..

Answer / ahmed

the valve will close because air is fail then only one force is available the spring force the valve will follow spring power even if sov still energized

Is This Answer Correct ?

13 Yes

0 No

Single acting ON-OFF valve. it is air to open. when sov energized , valve will be open, so during th..

Answer / prem

Since SOV is energized theoretically valve will not close. To depressurize the actuator/valve SOV must de energize to open the vent port.
In Other whand,if pneumatic source become empty and no back up supply, Valve will close gradually due to loss of instrument air supply even though SOV is energized.

Is This Answer Correct ?

5 Yes

1 No

Single acting ON-OFF valve. it is air to open. when sov energized , valve will be open, so during th..

Answer / kausar

If it has airlock then it will be remain same because at the time of pneumatic failure it locks the air automatically.generally now with control valve airlock,booster ,sov and air filter regulator are arranged in order to make the line safe

Is This Answer Correct ?

1 Yes

1 No

Single acting ON-OFF valve. it is air to open. when sov energized , valve will be open, so during th..

Answer / bibhutibhusan0

It will be remain in same condition if there is no air leakage and the valve is not spring loaded.

Is This Answer Correct ?

1 Yes

1 No

Post New Answer

More Instrumentation Interview Questions

HOW DOES SPECIFIC GRAVITY AFFECT LEVEL MEASUREMENT.

3 Answers

How does pyrometer works?

1 Answers

How much voltage we get between two wire of 4 to 20 ma output? Is this voltage up or down respectvice to 4 - 20 ma ?

9 Answers

Why mmwc unit is used?

0 Answers

Sir, my yokugava FF TYPE LEVEL transmitter us bad, i don't have spares available, i want to replace it with a Rosemount FF transmitter, please tell me what procedure to be followed and what changes to be done in dcs part.

1 Answers BPCL Bharat Petroleum, OEG,

Describe all types and levels (4-20mA, 0-10V, mV, pulse, etc.)of analog and digital I/O used in process control application.

2 Answers Jindal,

what is the role of proportional in process control?

6 Answers OGDCL, Trident,

Close loop and open loop.

3 Answers CCIE,

what is cascade loop and how it work and why it used instead of PID single loop? In cascade, Which loop is faster and slower? Please explain with loop drawing and example...

2 Answers Honeywell,

what is buoyancy law?

1 Answers

What types of thermocuple are mostly used?

6 Answers

what diffrence b/w plc s7200,300,400

0 Answers IFFCO, Reliance,

For more Instrumentation Interview Questions Click Here