The principal of a 2/2 Direct Acting Solenoid Valve
2/2 normally closed direct acting solenoid valves
Direct acting solenoid valves do not use a diaphragm, their seal is part of the moving core.
A spring holds the core against the seal, when energised the spring is overcome and the seal
is lifted from the orifice seat, thus allowing the media to pass through the valve.
fig 1 - 2/2 Direct Acting
2/2 normally open direct acting solenoid valves
With normally open direct acting valves the fixed core is located in the bottom part of the armature tube.
The armature is located in the upper part. A stem passes through the fixed core and is coupled to the seal.
This is held off the seal by means of a spring and makes a seal when the coil is energised.
