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Pilot-Operated Solenoid Valves   Description
pilot-operated 
Internal pilot-operated (servo) valves normally have a pilot and bleed orifice, which enables them to use line pressure for operation. When the solenoid is deenergised, the pilot orifice is closed and full line pressure is applied to the top of the piston or diaphragm through the bleed orifice, providing the seating force for tight closure.
This operation method requires a certain difference in the pressure across the valve ports.
 
AL 03
2/2 way solenoid valve with diaphragm
? No energised port P closed by spring return (NC).
? G 3/8" - G 2", DIN ISO 228
? Flow medium:Neutral, gaseous and liquid media

AL 07 / 08
2/2 way solenoid valve with piston
? No energised port P closed by spring return (NC).
? G 3/8" - G 3/4", DIN ISO 228
? Flow medium:Neutral, gaseous and liquid media

i 145
2/2 way solenoid valve with diaphragm
? For high temperature
? No energised port P closed by spring return (NC).
? G 3/8" - G 1", DIN ISO 228
? Flow medium:Hot water, steam and other media

28
2/2 way solenoid valve
? Flange-connection
? DN 15 - 50
? No energised port P closed by spring return (NC).
? Flow medium:Neutral, gaseous and liquid media
 
AN 03
2/2 way solenoid valve with diaphragm
? No energised port P opened by spring return (NO).
? G 3/8" - G 2", DIN ISO 228
? Flow medium:Neutral, gaseous and liquid media

160 
2/2 ways plastic solenoid valve
? No energised port P closed by spring return (NC).
? d20 - d 63, G 1/2 - 2", DIN EN 175301-803
? Flow medium:Aggressive fluids and gases