Multi-function valve for dosing pumps
Four functions in one valve:
pressure loading, pressure relief, deaeration, drain
The new Grundfos Alldos multifunction valve is directly mounted on the discharge
side of the dosing pump and disposes of two separate chambers controlled by diaphragms.
Thus it can be used as both pressure loading valve for pressure build-up and pressure relief valve.
In case there is not enough backpressure in the system, the multifunction valve maintains
the backpressure at the level which is necessary for the optimum functioning of the pump.
On the other hand it protects the discharge side dosing line system from too high pressure
build-up. The pump can be deaerated and the discharge side tubing system can be drained via
the multifunction valve.
Easy commissioning:
Before starting the dosing pump operation, the dosing head is deaerated by opening the pres-sure
relief valve.
High process quality:
If the backpressure which is necessary for an optimal functionality of the suction and pressure
valves has been built up, the multi-function valve maintains the pressure constantly on the
adjusted level. Optimal dosing is thus assured even in systems with pressure fluctuations or
in depressurized systems.
High process reliability:
If the pressure exceeds the adjusted opening pressure, the multi-function valve opens and
the dosing liquid can flow back into the dosing tank. The discharge side dosing line system
is so protected from a too high pressure build-up.
Easy maintenance:
The entire pressure line can be drained by simply turning both handles of the multi-function valve.
Extra plus: the anti-siphon effect
The multi-function valve prevents unregulated flowing of the dosing liquid through the dosing lines
(siphon effect), if the suction-side pressure is higher than or the same as the system pres-sure,
but below the opening pressure of the multi-function valve.
Special highlight: free adjustment of the pressure ranges
The loading pressure is freely adjustable between 1 and 4 bar, the relief pressure between 7 and 18 bar.
| Dosing pumps with Multi-function valve: |
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| Connections |
| Connection |
DME |
DMI |
DMI
P3 |
DME |
DDI |
DDI
P3 |
DMX
221 |
DMH
25x |
G 3/8"
(DN 4) |
- |
≤6 l/h |
- |
- |
≤5,5 l/h |
- |
- |
- |
G 5/8"
(DN 8) |
- |
≤18 l/h |
≤5,2 l/h |
- |
≤60 l/h |
≤4,9 l/h |
≤50 l/h |
≤50 l/h |
| M 30 |
≤12 l/h |
- |
- |
≤48 l/h |
≤60 l/h |
- |
- |
- |
| Werkstoffe |
| Materials |
| Valve body |
Connections |
Gaskets |
| PVDF |
PVC, PP or PVDF |
EPDM or FKM |
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