Valve material selection should not be based only on nominal pressure or valve size. Operating pressure, temperature,...
What is IEC 60534?
The IEC 60534 series provides internationally recognized requirements for the design, selection and performance evaluation of control valves used in process industries.
Applications
- Control Valves
- Pressure Reducing Valves
- Steam Conditioning Valves
- Desuperheaters
- Process Control Systems
- Power Plants
- Chemical Plants
- Oil & Gas Facilities
Main Parts of IEC 60534
| Part | Scope |
|---|---|
| IEC 60534-2-1 | Flow Capacity Sizing |
| IEC 60534-2-3 | Noise Prediction |
| IEC 60534-4 | Inspection and Testing |
| IEC 60534-6 | Positioners |
| IEC 60534-8 | Noise Calculations |
Flow Coefficients Kv and Cv
IEC 60534 uses flow coefficients to define valve capacity.
Kv
Metric flow coefficient expressed in cubic meters per hour.
Cv
Imperial flow coefficient expressed in US gallons per minute.
Control Valve Sizing
- Flow Rate
- Pressure Drop
- Temperature
- Fluid Density
- Inlet Pressure
- Outlet Pressure
- Control Range
Valve Characteristics
Linear
Flow changes proportionally with valve travel.
Equal Percentage
Equal increments of valve travel produce equal percentage changes in flow.
Quick Opening
Provides rapid flow increase at low valve travel.
Cavitation Prediction
IEC 60534 provides methods for evaluating cavitation risk in liquid applications.
Noise Prediction
IEC 60534-8 provides noise prediction procedures for gases, steam and liquids.
Typical Industrial Applications
- Steam Systems
- Power Plants
- Chemical Plants
- Petrochemical Facilities
- Process Industries
Related Standards
>| Standard | Scope |
|---|---|
| IEC 60534 | Control Valves |
| ISA 75 | Control Valve Sizing |
| ASME B16.34 | Valve Design |
Frequently Asked Questions
What is Kv?
A metric flow coefficient used in valve sizing.
What is Cv?
An imperial flow coefficient used in valve sizing.
Which valve characteristic is most common?
Equal Percentage is the most commonly selected characteristic for process control applications.
Does IEC 60534 cover noise prediction?
Yes, through IEC 60534-8.
Conclusion
IEC 60534 is the leading international standard for control valve sizing, performance evaluation and process control applications.