Submittal Sheet

1
2
3
4
5
7
6
Danfoss 80Z826
1.
2.
3.
4.
5.
6.
7.
Coil
Armature spring
Armature
Pilot orice
Diaphragm
Main orice
Equalizing orice
2 Functions
2.1 Function, NC
Coil voltage disconnected
When voltage is disconnected, the armature spring (2) presses the armature (3) down against the pilot orice (4).
Pressure builds up over the diaphragm (5) via the equalizing orice (7). The diaphragm closes the main orice (6) as
soon as the pressure over the diaphragm equals the inlet pressure. The valve stays closed for as long as voltage
remains disconnected.
Coil voltage connected (open)
When voltage is applied to the coil (1), the pilot orice (4) is opened. Since the pilot orice is larger than the
equalizing orice (7), pressure over the diaphragm (5) falls and the diaphragm is lifted clear of the main orice (6).
The valve stays open for as long as the required least dierential pressure is present and voltage is applied to the
coil.
Figure 1: Function, NC
2.2 Function, NO
Coil voltage disconnected (Open)
When voltage is disconnected, the pilot orice (4) is opened. Since the pilot orice is larger than the equalizing
orice (6), pressure over the diaphragm (5) falls and the diaphragm is lifted clear of the main orice (7). The valve
stays open for as long as the required minimum dierential pressure is present and voltage is applied to the coil.
Coil voltage connected (Close)
When voltage is applied to the coil (1), the armature spring (2) presses the armature (3) down against the pilot
orice (4). Pressure builds up over the diaphragm (5) via the equalizing orice (6). The diaphragm closes the main
orice (7) as soon as the pressure over the diaphragm equals the inlet pressure. The valve stays closed for as long as
voltage remains disconnected.
© Danfoss | Climate Solutions | 2021.06 AI204086427956en-001101 | 3
Solenoid valve, Type EV220A