TSE DP20-4H, Owner'S Manual

Page: 46 / 242

Loop Flushing Valve
MP1 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 MP1 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
C
har
ge pr
essur
e [d bar]
Flow [lpm]
Ø1.6
Ø1.9
Oil Temp = 50°C (~30 mm
2
/S)
2 6
P400352
C
Caution
When a MP1 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
12 | © Danfoss | July 2017 AX00000244en-US0103