Solenoid armature

Stainless steel type 430F is a modification of type 430. The carbon content is reduced to 0.065%, manganese to 0.80%, and silicon to 0.3/0.7%, while 0.5% molybdenum and 0.60% nickel have been added. This is an alloy used extensively in solenoid armatures and top plugs. It has also been used in solenoid coils and housings operating in corrosive environments. 

Solenoid Valves The electric solenoid valve has tw o output states. Wlien sufficient electric current is supplied to the coil, an internal armature moves against a spring to an extreme position. This motion causes an attached pneumatic or hvdraiilic valve to operate. Wlien current is removed, the spring returns the armature and the attached solenoid valve to the deenergized position. An intermediate pilot stage is sometimes used when additional force is required to operate the main solenoid valve. Generallv, solenoid valves are used to pressurize or vent the actuator casing for on/off control-valve application and safetv shutdown applications. 

A typical electric solenoid actuator is shown in Figure 38. It consists of a coil, armature, spring, and stem. 

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