6.3 Solenoid Operated Valves

Describe a solenoid operated valve and identify its purpose in an electrically controlled system

 

Describe the similarities and differences between a solenoid operated valve and a contactor

 

Differentiate between the terms NO and NC as applied to electrical switches and valves

Draw the hydraulic schematic symbol for a spring offset, 2 position, four way, solenoid operated valve with a cross connect in the deactivated state and a straight through in the activated state

 

Draw the electrical schematic symbol for the coil of a solenoid operated valve

 

Describe a solenoid and discuss its function and purpose inside a solenoid operated valve

 

Describe the purpose of the drain port inside a solenoid operated hydraulic valve

 

Describe the purpose of a manual override for a solenoid operated valve and draw its schematic symbol

 

Differentiate between the applications of closed, tandem, float, and open center 3 position valves

 

Describe the problems associated with the simultaneous activation of both solenoids for a double solenoid valve and discuss the means of preventing this from occurring

 

Differentiate between electrically held and detented solenoid operated valves

 

Describe the components of a typical solenoid operated valve and identify their purpose

 

Define and differentiate between rated voltage, pickup voltage, hold in voltage, and dropout voltage

 

Describe why a 120V AC coil cannot be used with 24V DC

 

Differentiate between inrush and sealed in current

 

Describe why a means of voltage spike suppression must be used for certain coils

 

Discuss points of inspection and maintenance procedures for solenoid operated valves

 

Describe shift limit characteristics for solenoid operated valves

 

Define both “rated flow” and “maximum inlet pressure” for solenoid operated valves

 

Describe both the “pressure drop for different flow rates” and “operating limits” performance curve for solenoid operated valves

 

Describe leakage, fluid compatibility, and required filtration specifications for solenoid operated valves

 

Describe a variable solenoid operated valve and discuss its application for a hydraulic system

 

Describe a piggyback valve and discuss its application for a hydraulic system

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6.3 Solenoid Operated Valves by James Pytel is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License, except where otherwise noted.

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