A comprehensive analysis of two-position two-way solenoid valves: structural principles, application selection and maintenance guide

1. Core role and industry positioning

2/2 Ways Solenoid Valves are key actuators for industrial automation fluid control, and their core functions are:

Precise on-off control: Rapidly switch the flow and cutoff of the medium (gas/liquid) through electrical signals, with a response time of 10-100ms

The cornerstone of process automation: It accounts for more than 35% of the industrial control valve market share and is widely used in automated production lines in hydraulics, pneumatics, chemical engineering and other fields

Medium adaptability: Standard models can handle -20℃~180℃ media, and special models support corrosive fluids (such as acid and alkali solutions) or high-viscosity media (such as hydraulic oil)

2. Structure and working principle

Core components

Working principle

Powered state: The coil is energized to generate electromagnetic force, which overcomes the spring resistance and pulls the valve core to open the flow channel

Power-off state: The spring reset force pushes the valve core to close, achieving automatic flow cut-off

Flow characteristics: CV value (flow coefficient) determines the flow capacity

3.Key points for use and maintenance

• Installation specifications

The valve body must be installed in the direction indicated by the arrow (reverse installation will cause seal failure)

The pipeline needs to be equipped with a filter with a mesh size of 100 or above to prevent impurities from blocking the valve core (80% of failures are caused by medium contamination)

• Operation monitoring

Coil temperature rise alarm threshold: ambient temperature + 40℃ (if exceeded, the machine must be shut down for inspection)

Auscultation judgment method: normal action sound response <65dB, the appearance of metal impact sound indicates spring failure

• Preventive maintenance

Check the elasticity of the seal every 2000 hours (compression permanent deformation ≤15% is qualified)

The medium needs to be emptied for long-term non-use, and the coil should be activated once a month in a humid environment to prevent moisture from getting on the coil

4.Troubleshooting Quick Check List