Indirect servo operated for compact installation in various applications
EV220W is a range of compact indirect servooperated 2/2 way solenoid valves with
connections from 3/8” to 2”, especially
designed for use within a limited space. This
range has been designed for use within various
markets, such as, the Industrial and HVAC
markets, which demand an easy and reliable
valve that is easy to setup and use.
Features and versions
• For water, oil, compressed air and similar
neutral media
• NBR for air and oil
• WRAS approved with EPDM sealing; 0 – 90 °C
NC version 0 – 50 °C NO version
• Standard equipped with clip on coil for dry
and humid environments
When voltage is disconnected, the armature spring (2) presses the armature (3) down against the pilot orice (4).
Pressure builds up over the diaphragm (5) via the equalizing orice (6). The diaphragm closes the main orice (7) 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 orice (4) is opened. Since the pilot orice is larger than the
equalizing orice (6), pressure over the diaphragm (5) falls and the diaphragm is lifted clear of the main orice (7).
The valve stays open for as long as the required minimum dierential pressure is present and voltage is applied to
the coil.
When voltage is disconnected, the pilot orice (4) is opened. Since the pilot orice is larger than the equalizing
orice (6), pressure over the diaphragm (5) falls and the diaphragm is lifted clear of the main orice (7). The valvestays open for as long as the required minimum dierential 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
orice (4). Pressure builds up over the diaphragm (5) via the equalizing orice (6). The diaphragm closes the main
orice (7) as soon as the pressure over the diaphragm equals the inlet pressure. The valve stays closed for as long as
It is recommended to use a lter in front of the valve. Recommended lter 50 mesh (297 microns).
Figure 3: Filter
In water applications, exercise the valves at least once every 24 hours, meaning change the state of the valve. The
valve exercise will minimize the risk of the valve sticking due to calcium carbonate, zinc or iron oxide build-up.
Figure 4: Exercise: Valve on/o
To minimize scaling, and corrosion attack it is recommended that the water passing the valve have the following
values:
• Hardness 6-18 °dH to avoid scaling (chalk / lime stone build up).
• Conductivity 50 – 800 µS/cm to avoid brass dezincication and corrosion.
• Above 25°C media temperature avoid stagnant water inside the valve to avoid dezincication and corrosion
attack.
Figure 5: Caution: Coil Risk
WARNING:
Risk of burns/re if used for a continuous power-on time through hot coil surface.
• l Do not touch the coil with bare hands.
• l Keep the coil away from highly ammable substances with low ignition point.
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