Loop flushing valve
pumps are available with an optional integral loop flushing. A loop flushing valve will remove heat and
contaminants from the main loop at a rate faster than otherwise possible.
The loop flushing design is a simple spring centered shuttle spool with an orifice plug. The shuttle shifts
at approximately 3.9 bar [55.7 psi]. The flushing flow is a function of the low loop system pressure
(charge) and the size of the plug.
Working Loop (Low Pressure)
Working Loop (High Pressure)
Shuttle Spool
Orifice Plug
P400342
Loop flushing performance
25
20
35
40
45
30
15
10
5
0
0
4
8
10
12
14
Char
ge pr
essur
e [d bar]
Flow [lpm]
Ø1.6 (standard)
Ø1.9 (optional)
Oil Temp = 50°C (~30 mm
2
/S)
2
6
P400352
When a pump is used with an external loop flushing shuttle valve, ensure that the charge setting of the
pump matches the setting of the loop flushing shuttle valve. Contact your Danfoss representative for the
availability of additional charge relief settings.
Service Manual
MP1
Operation
©
Danfoss | April 2019
AX00000244en-000201 | 13
