Diaphragm valve body types are commonly available in various configurations, including single-seat, double-seat, angle, diaphragm, small flow, tee, eccentric rotating, butterfly, sleeve, and spherical designs—totaling ten main types. Before selecting a diaphragm valve, it's essential to thoroughly analyze the medium being handled, the process conditions, and the control parameters. Collecting sufficient data to understand the system requirements is crucial in determining the most suitable valve type for the application.
When making the actual selection, several key factors should be considered:
1. **Spool shape and structure** – The design of the valve spool should align with the desired flow characteristics and take into account unbalanced forces that may affect performance.
2. **Wear resistance** – If the fluid contains high concentrations of abrasive particles, the valve plug and seat will experience significant wear each time the valve closes. Therefore, it's important to choose a valve with a smooth flow path and hard-wearing internal materials to extend service life.
3. **Corrosion resistance** – In cases where the medium is corrosive, it's advisable to select a valve with a simple structure that still meets the necessary control function requirements, as complex designs may be more prone to failure in harsh environments.
4. **Temperature and pressure** – When dealing with high-temperature or high-pressure media, the materials used for the valve plug and seat must be able to withstand these conditions without significant degradation. This ensures reliable operation under varying process conditions.
5. **Prevention of flashing and cavitation** – Flashing and cavitation occur only in liquid media and can cause severe damage to the valve, reduce its lifespan, and lead to vibration and noise. These phenomena also complicate the calculation of the flow coefficient. To avoid such issues, the valve should be selected with proper design features that minimize the risk of flashing and cavitation.
By carefully considering these aspects, engineers can make informed decisions that enhance the efficiency, reliability, and longevity of diaphragm valves in industrial applications.
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