a) Solenoid valve is an electromechanical controlled valve, used to control the flow of liquids and gases.

b) Solenoid Valves are divided into 3 main categories:

• 2/2 Way Fluid Valve
• 5/2 Way Solenoid Valve
• 3/2 Way Solenoid Valve

c) There are many variations of solenoid valves. Consisting of: 

• Single Acting
• Double Acting
• One or Two Solenoid Valves
• Direct Current or Alternating Current Powered
• Different Number of Ways and Positions

d) Main Parameters to Valve Selection:

• Cv, Coefficient of Flow
• Media Compatibility
• Pressure
• Temperature
• Process Fitting