When selecting a solenoid valve, safety should always be the top priority. Neglecting safety can lead to serious consequences, including system failure or even disasters. Here are key considerations: 1. **Safety Considerations** - **Corrosive Media**: For corrosive substances, it's recommended to use plastic or all-stainless-steel solenoid valves. In cases of highly corrosive media, isolation diaphragm valves (e.g., CD-F.Z3CF) must be used. For neutral media, copper alloys are suitable, but if not used, the valve body may rust, especially when the valve is not operated frequently. Note that ammonia valves cannot be made of copper. - **Explosive Environments**: Choose explosion-proof models appropriate for the level of risk. In outdoor or dusty environments, opt for waterproof and dustproof types. - **Pressure Requirements**: The nominal pressure of the solenoid valve must exceed the maximum working pressure of the pipeline to ensure safe operation. 2. **Applicability** - **Media Characteristics**: - Gas, liquid, or mixed media require different types of solenoid valves. For example, ZQDF is suitable for air, ZQDF-Y for liquids, and ZQDF-2 (or -3) for steam. Using the wrong type can cause malfunctions. - Temperature variations affect performance—extreme temperatures can damage coils or cause seals to age. - Viscosity matters: for media with viscosity above 50cSt, larger diameter valves (over 15mm) should use multi-function ZDF series valves. Smaller diameters may require high-viscosity models. - Cleanliness is important—install a filter before the valve if the medium is dirty. Direct-acting diaphragm valves like CD-P are suitable for low-pressure applications. - If the medium has a directional flow and backflow is not allowed, use ZDF-N or ZQDF-N models and specify this in your request. - Ensure the operating temperature is within the valve’s allowable range. - **Pipeline Parameters**: - Select the valve size based on the pipe connection and flow requirements. For small diameters, CA5 or Z3F models work well for one-to-two-pipe configurations. For larger diameters, ZDF-Z1/2 is ideal. - Use the Kv value to determine the nominal diameter, and match it with the pipe size. Be cautious—some manufacturers may have smaller internal holes than the stated size. Don’t compromise on price if quality is at stake. - For low-pressure differential (above 0.04MPa), indirect pilot valves are suitable. If the pressure is near zero, choose direct or step-by-step direct valves. - **Environmental Conditions**: - Ensure the ambient temperature is within the valve’s operating range. Special orders may be needed for extreme conditions. - In humid or wet environments, use waterproof valves. - For vibrating or impact-prone areas, select specialized valves such as marine-grade models. - In corrosive or explosive environments, prioritize corrosion-resistant or explosion-proof options. - In tight spaces, multi-functional valves eliminate the need for bypasses and manual valves, making maintenance easier. - **Power Supply Conditions**: - Choose AC or DC valves depending on the power source. AC is typically more convenient. - Standard voltages like AC 220V or DC 24V are preferred. - Voltage fluctuations should be within +10% / -15% for AC and ±10% for DC. If unstable, consider voltage stabilization or custom orders. - Match the valve’s current and power consumption with the available capacity. Note that AC start-up VA values are higher, so indirect pilot valves may be better in low-capacity systems. - **Control Accuracy**: - Basic solenoid valves offer only on/off functions. For precise control, use multi-position valves like Z3CF (three normally open states) or ZDF-Z1/1 (four flow positions). - Operating time refers to how quickly the valve responds to an electrical signal. Only patented multi-function valves allow separate adjustment of opening and closing times, reducing water hammer risks. - Leakage levels vary; standard models are cost-effective, but higher leakage may require special orders. 3. **Reliability** - **Working Life**: This is usually tested during type testing, not factory testing. Choose reputable brands for long-term reliability. - **Work Standards**: Long-term, short-term, or repeated operations require different valve types. Conventional models are designed for continuous operation. For long-open, short-close scenarios, use normally open valves. - **Operating Frequency**: High-frequency use requires direct-acting valves. AC power is generally preferred. - **Operational Reliability**: While not officially standardized, choosing trusted manufacturers ensures quality. In critical applications like fire protection, reliability is crucial. Redundant systems may be necessary. 4. **Economy** - Economy is about minimizing waste of capital, energy, and resources. It must be balanced with safety, applicability, and reliability. - Price alone isn’t enough—consider function, quality, and maintenance costs. A cheap valve may cause costly failures down the line. - In automated systems, the solenoid valve’s cost is relatively low, but its role is vital. Always prioritize performance and durability over initial savings. In summary, selecting a solenoid valve involves careful evaluation of safety, applicability, reliability, and economy. A well-chosen valve ensures smooth operation, reduces downtime, and protects the entire system.

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