The Importance of Valve Selection
The selection of regulating valve structure is based on a comprehensive consideration of factors such as the medium used, temperature, pressure before and after the valve, flow rate, physical and chemical properties of the medium, and cleanliness of the medium. The correctness and rationality of valve structure selection directly affect the performance, regulation performance, regulation stability, and service life.
The operating condition information that needs to be implemented for valve selection
1, Process parameters:
1. Media name.
2. Density, viscosity, temperature, and cleanliness of the medium (with particulate matter).
3. Physical and chemical properties of the medium, such as corrosiveness, toxicity, acidity and alkalinity.
4. Medium flow rate: maximum, normal, minimum.
5. Pressure before and after the medium valve: maximum, normal, minimum.
6. The viscosity of the medium, the higher the viscosity, the more it affects the calculation of Cv value.
These parameters are mainly used to calculate the size parameters such as the required diameter and rated Cv value of the valve, as well as the appropriate materials that the valve should use.
2, Functional parameters:
1. Action modes: electric, pneumatic, electro-hydraulic, hydraulic.
2. Valve function: regulating, cutting off, regulating and cutting off shared.
3. Control methods: locator, solenoid valve, pressure reducing valve.
4. Action time requirements.
This part of the parameters is mainly used to determine the functional requirements of the valve and the accessories that need to be configured.
3, Explosion proof protection parameters:
1. Explosion proof rating.
2. Protection level.
4, Environmental and power parameters:
1. Environmental temperature.
2. Power parameters: gas source pressure, power supply pressure.
Precautions for valve replacement
If replacing the valve, the following dimensional parameters should also be provided to avoid situations where the valve cannot be installed, cannot be installed, or has insufficient space due to inconsistent valve manufacturers, different standards used, or different valve structural forms.
