4 Function and Use
4.1
Superstructure
Fig. 1: MFV II-III - superstructure
1 Valve inlet (from pump)
2 Valve outlet (to dosing line)
3 Bypass connection (to tank)
4 Overpressure: venting / draining (setting knob "B")
5 Pressure maintenance side: Emptying (setting knob
"A")
6 Manometer connection
We recommend the use of a manometer to be able to read the set back
pressure.
4.2 Functional Description
The following functions are done by two spring loaded diaphragms.
4.2.1
Pressure holding function
Protection against sucking empty at under pressure or empty
lifting due to creation of an artificial counter pressure.
In normal operation a diaphragm valve must be pressed
against a preset spring pressure of 0,1 MPa
(1 bar) for
passage to the metering line by the delivery pressure of the
metering pump.
Function and Use
20417101224 Rev. 05-05.2019
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