1. Voltage: the first thing to consider is the supply voltage of the solenoid valve, which is DC or AC. 2. Power or Resistance: 3. Dimension: hole diameter, height and width. 4. Working Environment: temperature, humidity, indoor or outdoor, protection class. 5. Connector Type: pin type, flying leads type, standard interface, etc. 6. Application: some special application areas require the use of specially designed solenoid coils. For examples, some industries require waterproof, must use IP67 or higher grade solenoid coils. 7. Other Requirements: such as environmental protection material requirements or certification.