SlideShare a Scribd company logo
Arab Oil & Natural Gas website
Presents
How Control Valve works?
for beginners
Control valves are used to control Pressure,
Temperature, flow or Level in any process
plant, within a required operating
range to ensure the quality of the end
product.
How Control Valve works?
Lets take an oil-gas separator as an example.
Oil – Gas
Separator
this separator discharges gas, and a gas discharge
valve (red valve) is put for this purpose.
and it is equipped with a pressure gauge “PG” PG
How Control Valve works?
Lets say we want to maintain the separator pressure at 70 psig
Oil – Gas
Separator
the operator will keep in his mind this pressure and
will close and open the RED valve slightly to maintain
the pressure at 70 psig
70 psig
How Control Valve works?
Oil – Gas
Separator
maintain the pressure at 70 psig
70 psig
the operator will always make a comparison
between the PG and the 70 psig in his mind, and
will take action on the valve according to this
comparison
If you want replace this manual valve with a Pressure Control Valve PCV
How Control Valve works?
the Pressure Gauge PG will be replaced with a Pressure Transmitter PT
the operator will be replaced with a Pressure Indicator Controller
the 70 psig in operator mind is the Set Point SP
PTSP PIC
the setpoint will be
inputted by the
operator
How Control Valve works?
PTSP PIC
In the auto control system, the PIC receives a signal
from the PT, then compares it with the set point SP,
then takes an action, either by closing or opening the
valve to achieve the set point.
Take a look at this control system, the pressure vessel is controlled by a PCV. The PIC
compares the SP with the PT reading, then gives a signal to the PCV “electronic signal”, this
electronic signal is transferred to Air Pressure through an I/P “current to Press.”
another example but more complicated.
in this control system, temperature is controlled by a TIC which takes a signal from
a TI then controls 2 FCVs to control the temperature out of heat exchanger.
for more FREE movies, visit:
Arab Oil & Natural Gas website
www.Arab-Oil-NaturalGas.com

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How control valve works

  • 1. Arab Oil & Natural Gas website Presents
  • 2. How Control Valve works? for beginners
  • 3. Control valves are used to control Pressure, Temperature, flow or Level in any process plant, within a required operating range to ensure the quality of the end product.
  • 4. How Control Valve works? Lets take an oil-gas separator as an example. Oil – Gas Separator this separator discharges gas, and a gas discharge valve (red valve) is put for this purpose. and it is equipped with a pressure gauge “PG” PG
  • 5. How Control Valve works? Lets say we want to maintain the separator pressure at 70 psig Oil – Gas Separator the operator will keep in his mind this pressure and will close and open the RED valve slightly to maintain the pressure at 70 psig 70 psig
  • 6. How Control Valve works? Oil – Gas Separator maintain the pressure at 70 psig 70 psig the operator will always make a comparison between the PG and the 70 psig in his mind, and will take action on the valve according to this comparison
  • 7. If you want replace this manual valve with a Pressure Control Valve PCV How Control Valve works? the Pressure Gauge PG will be replaced with a Pressure Transmitter PT the operator will be replaced with a Pressure Indicator Controller the 70 psig in operator mind is the Set Point SP PTSP PIC the setpoint will be inputted by the operator
  • 8. How Control Valve works? PTSP PIC In the auto control system, the PIC receives a signal from the PT, then compares it with the set point SP, then takes an action, either by closing or opening the valve to achieve the set point.
  • 9. Take a look at this control system, the pressure vessel is controlled by a PCV. The PIC compares the SP with the PT reading, then gives a signal to the PCV “electronic signal”, this electronic signal is transferred to Air Pressure through an I/P “current to Press.”
  • 10. another example but more complicated. in this control system, temperature is controlled by a TIC which takes a signal from a TI then controls 2 FCVs to control the temperature out of heat exchanger.
  • 11. for more FREE movies, visit: Arab Oil & Natural Gas website www.Arab-Oil-NaturalGas.com