The flow rate of the fluid remains constant if the open degree of the valve that is installed along the pipeline is maintained at the same degree. However, the flow rate will change if any change is made in the pressure downstream of the valve (service pressure) or upstream of the valve (initial pressure).
The flow control valve is self-operating and doesn't need a power source. The valve is designed to ensure that the differential pressure before and after the variable orifice generated by the flow of a fluid (pressure difference between downstream and upstream) is applied to a piston or diaphragm in establishing a balance with a setting spring. The piston or the diaphragm film is connected to a built-in valve, and how much the valve opens is automatically adjusted in maintaining the differential pressure before and after the variable orifice at the same level as the set pressure, which is how the flow rate is maintained at a constant.
The desired flow rate is obtained by controlling how much the variable orifice is opened. Furthermore, the unique and novel self-operated flow control valve allows the flow to be adjusted with the same degree of openness, or the valve capacity to be easily changed through controlling how open the variable orifice is.
Type |
FCV1/2-11 |
FCV1/2-21 |
FCV-10 |
FCV-20 |
Flow range |
50~500 |
1000~5500 |
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100~1000 |
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Maximum applicable pressure (MPa) |
2 |
2 |
||
Required valve differential force (MPa) |
0.1 |
0.1 |
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Inner valve drive type |
Piston type |
Piston type |
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Orifice opening change type |
Motor-driven |
Lever handle |
Motor-driven |
Type |
FCVD-13 |
FCVD-23 |
FCVD-33 |
|
Flow range |
20~50 |
50~200 |
200~500 |
|
Maximum applicable pressure (MPa) |
1 |
|||
Required valve differential force (MPa) |
0.1 |
|||
Inner valve drive type |
Diaphragm type |
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Orifice opening change type |
Lever handle |