The diaphragm pump plays a crucial role in process control by receiving signals from a regulator or computer and adjusting the flow of the medium being controlled. This ensures that the desired parameter—such as temperature, pressure, flow, or level—remains within the required range, enabling automation of the production process. Compared to manual adjustment, where the human eye serves as the detection unit, the brain as the control unit, and the hand and foot as the execution unit, the diaphragm pump acts as the mechanical equivalent, performing precise and consistent actions.
In industrial processes, achieving stable and accurate control of key parameters is impossible without the proper use of a diaphragm pump. Selecting the right diaphragm pump requires both solid theoretical knowledge and extensive practical experience. A well-chosen pump not only helps in fine-tuning PID parameters for optimal control performance but also significantly extends its service life.
When selecting a diaphragm pump, several factors must be carefully considered:
1. **Valve Plug Design**: The shape of the valve plug should be selected based on the flow characteristics and the forces acting on it, ensuring smooth operation and minimal wear.
2. **Wear Resistance**: In applications involving abrasive suspensions, the valve seat and plug are subject to significant friction during each cycle. Therefore, the valve should have a streamlined design and use hard materials to resist wear.
3. **Corrosion Resistance**: For corrosive media, it’s best to choose a simple valve structure that still meets the control requirements, minimizing the risk of damage over time.
4. **Temperature and Pressure Conditions**: When dealing with high temperatures or pressures, the materials used for the valve core and seat should be able to withstand these changes without degrading.
5. **Prevention of Flash and Cavitation**: These phenomena occur in liquid media under certain conditions and can cause flow coefficient inaccuracies, vibrations, noise, and reduced valve lifespan. To avoid this, the pump and valve should be selected with features that prevent flash and cavitation.
In summary, the necessity and selection principles of diaphragm pumps are essential for maintaining efficient and reliable process control. Careful consideration of these factors ensures long-term performance, safety, and cost-effectiveness in industrial applications.
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