A: Applicability The fluid in the pipeline must match the medium for which the selected solenoid valve is calibrated. The operating temperature of the fluid should not exceed the rated temperature of the solenoid valve. Generally, solenoid valves are suitable for liquids with a viscosity below 20CST. If the viscosity exceeds 20CST, special attention should be given to ensure compatibility. Regarding working pressure, if the maximum pipeline pressure is less than 0.04MPa, it's recommended to use direct-acting or step-by-step solenoid valves, such as ZS, 2W, ZQDF, or ZCM series. For minimum working pressure above 0.04MPa, pilot-operated solenoid valves are more appropriate. The maximum pressure difference across the valve should not exceed its rated calibration pressure. Most solenoid valves are unidirectional, so check if a check valve is needed to prevent backpressure. If the fluid is not clean, install a filter before the solenoid valve to protect it from debris. The cleanliness requirement for the fluid is usually high, so maintaining clean conditions is essential. Pay attention to the flow diameter and ensure it matches the pipe size. Solenoid valves typically only control two states—open or closed. If possible, install a bypass line for easier maintenance. In cases where water hammer may occur, adjust the opening and closing time of the solenoid valve accordingly. Ambient temperature can affect the power supply current and power consumption, so choose a solenoid valve based on its output capacity. The voltage is generally allowed to fluctuate within ±10%, and note that AC start-up VA values are typically higher. Solenoid valves are available in normally closed (NC) and normally open (NO) types. Normally closed valves are more common, as they open when powered and close when power is off. However, for applications requiring long open times or very short cycles, normally open valves may be more suitable. Life testing is often part of factory testing, but there is no specific national standard for solenoid valves in China. Therefore, it's crucial to choose a reliable manufacturer. When operation frequency is high and response time is critical, select a direct-acting type. For large-diameter valves, opt for fast-response models. Most solenoid valves are not waterproof, so avoid using them in wet environments unless custom-made. The nominal pressure of the solenoid valve must exceed the maximum pressure in the pipeline to prevent damage or unexpected failures. For corrosive liquids, use all-stainless steel valves. For highly corrosive fluids, consider plastic-lined (SLF) solenoid valves. In explosive environments, always choose explosion-proof models. Lastly, while many solenoid valves are universal, it's important to prioritize performance, reliability, and safety when making your selection. Choosing the most cost-effective option should still meet the requirements of the three key factors: applicability, reliability, and safety.

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