how the 2.5bar pressure able to control the 40bar steam
Answers were Sorted based on User's Feedback
Answer / mohamed yousuf(instrumentation
according to the formula P=F/A
Actually we are applying the 2.5 bar pressure to the
diaphram actuator. By increasing the area of diaphram we
can increse the force acting on the diaphram and that muuch
of force is more enough to actuate the stem movement.even
though 40 bar pressure is applied only to the small area
(plug of the control valve).the force actiong on it will be
very small.
| Is This Answer Correct ? | 7 Yes | 0 No |
Answer / waseem ahmad
Mr. Bipinchandra is right but there are more possible
answers to this. 1) what is the differential pressure across
the valve? the pressure of steam might be 40kg but the
pressure of steam across the valve might not 40kg. 2) the
use of balanced plug in control valves allow us to control
high pressure fluids with minimum actuator force.
| Is This Answer Correct ? | 4 Yes | 0 No |
the 2.5 bar is used to control the valve by giving it to
the diaphragm to actuate it.so the process pressure 40bar
is controlled.
| Is This Answer Correct ? | 3 Yes | 0 No |
Answer / bipinchandra ravalia.
The 2.5 bar used to control the valve acts on the
Diaphragm. Now the area of the diaphragm is Large and thus
the Force Per Unit Area acting on the stem is very much
greater than the Process pressure of 40bar. Thus it is not
difficult to control this process pressure with the given
2.5 bar air supply to the control valve.
| Is This Answer Correct ? | 4 Yes | 2 No |
Answer / sagar,kptl
By using of pneumatic control valve,that control valve have a helical spring containing tension when give pressure 2.5 bar. That pressure force acting will control the 40 bar steam
.'.P=f/a
| Is This Answer Correct ? | 1 Yes | 0 No |
That's why in high pressures line(like super heater's steam in power plant) having double seated globe valves.therefor double seated plugs has line pressure both side equal (upside same and down side same ) is equal to line pressure 0
So thus, plug will operate according valve's pressure.....
| Is This Answer Correct ? | 0 Yes | 0 No |
Where should we terminate the shield and why?
what is the difference between laminor flow and turbulant flow
what is diff between the motor and pump
WHAT IS TSI? HOW ITS WORK
why pressure 3-15psi is used as industrial standard and what is the reason
2 Answers JAL International, UltraTech,
Why not come out analog output in ABB EL3020 when display show correct value
what is flow
What are all the type of vibration measurement measuring in turbine, what is the output of vibration sensor.
What is the meaning of the term "g force"?
3 Answers Reliance, Saint Gobain, Thermax,
what is the difference between PLC & DCS
What is the purpose of RS Networks
In instrumentation standard we use 4 to 20ma for transmission , why cant we use 3 to 19ma ?
Civil Engineering (5086)
Mechanical Engineering (4453)
Electrical Engineering (16638)
Electronics Communications (3918)
Chemical Engineering (1095)
Aeronautical Engineering (239)
Bio Engineering (96)
Metallurgy (361)
Industrial Engineering (259)
Instrumentation (3014)
Automobile Engineering (332)
Mechatronics Engineering (97)
Marine Engineering (124)
Power Plant Engineering (172)
Textile Engineering (575)
Production Engineering (25)
Satellite Systems Engineering (106)
Engineering AllOther (1379)