Page 10 EL-FLOW Base Series Mass Flow Controllers 9.17.061
1.7.3 Solenoid Valve Principle
The control valve used in the EL-FLOW Base series is a standard, direct operated control valve. It is a
normally closed solenoid valve. The plunger is lifted by the force of the magnetic field of the coil. The
diameter of the orifice under the plunger is optimised for the customer’s application.
The control valve is not designed to provide positive shut-off. It is recommended to install a separate
shut-off valve in the line if so required. Also pressure surges, as may occur during system pressurisation
must be avoided.
1.8 Maintenance
No routine maintenance is required to be performed on the controllers when they are used with clean
gas.
Units may be flushed with clean, dry inert gas.
In case of severe contamination it may be required to clean the inside of the instrument. After cleaning a
recalibration is needed. Bronkhorst® has a trained staff of servicemen available. Contact your local
supplier for cleaning and recalibration options.
If the equipment is not properly serviced, serious personal injury and/or damage to the equipment
could be the result. It is therefore important that servicing is performed by trained and qualified service
personnel.
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