Influence of Coil Overheating on Continuous Duty of 2-Way Solenoid Valve

Feb 10, 2026

In many automation systems, a 2 way solenoid valve is required to stay energized for hours, such as pressure holding in water treatment or standby in industrial automation. Under this condition, heat accumulates inside the coil while ventilation is often limited. Field experience shows that excessive temperature rise reduces magnetic force, leading to unstable actuation of the spool and abnormal flow.

Mechanism of Magnetic Force Reduction

When temperature increases, the resistance of the copper winding rises and the current decreases. For direct acting 2 way solenoid valve, the pull force may not overcome the spring. In pilot operated 2 way solenoid valve, insufficient pilot pressure results in delayed opening. Many normally closed 2 way solenoid valve failures are actually thermal problems rather than mechanical sticking.

Structural Consequences

Overheating also affects materials. The housing of a sealed 2 way solenoid valve can deform slightly, increasing friction. Elastomer seals harden and lose elasticity, especially in 2 way solenoid valve for steam or hot water applications. This shortens service life dramatically.

Typical Effects of Coil Overheating

Influence Item	Direct Result	System Symptom
Coil resistance rise	Current drop	Slow opening
Magnetic force reduction	Insufficient pull	Valve cannot stay energized
Insulation aging	Short circuit risk	Coil burn
Plastic deformation	Spool friction	Unstable flow
Seal hardening	Leakage	Pressure loss

Application Differences

Influence of Coil Overheating on Continuous Duty of 2-Way Solenoid Valve

A 2 way pneumatic solenoid valve with frequent air flow gains natural cooling, while valves in 2 way solenoid valve for HVAC or water treatment remain energized without cooling. High pressure 2 way solenoid valve bodies store more heat and require higher insulation class. Ignoring duty cycle in the 2 way solenoid valve sizing chart is a common selection mistake.

Voltage and Installation Factors

Voltage deviation directly changes coil power. The 2 way solenoid valve coil voltage comparison shows DC coils are sensitive to line drop. Mounting on metal brackets helps heat dissipation, while enclosed plastic boxes trap heat and accelerate aging.

Practical Prevention

◆ Use low power or continuous-duty coils

◆ Design rest intervals in 2 way solenoid valve control system

◆ Follow 2 way solenoid valve maintenance tips to check resistance

◆ Choose proper type for 2 way solenoid valve for chemical process or water systems

When deciding between different types such as 2 way solenoid valve vs 3 way solenoid valve, understanding thermal behavior is as important as flow capacity. Correct design protects reliability and avoids unnecessary replacement.

(FK9025)

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