Danfoss Loop flushing Installation guide

Service Kit Instructions

Series 42

Loop flushing

Series 42 pumps may incorporate an integral loop flushing valve for those applications that require additional fluid to be removed from the system power loop.

The loop flushing valve will remove heat and contaminants from the main power loop at a rate faster than otherwise possible. The loop flushing valve poppet includes an orifice whichremovesasetvolumeoffluidfromthepowerloop.This fluid is in turn made up by the charge pump.

An assessment of the application cooling requirements and system cooling capacity should be completed prior to installation of the components in the application. A flushing flow of 5 to 8 L/min (1.5-2 gpm) is generally suitable for most applications. Please refer to Sauer-Sundstrand BLN-9886 and BLN-10092 or contact your technical support personnel for further assistance.

Thiskitcontainstworeliefvalves.Thevalvesaremarkedwith a2ora3.Valve2(Options#2)containsa1.2mm(0.047inch) orifice,whilevalve3(Option#3)contains1.4mm(0.055inch) orifice. Using the cooling assessment analysis from above and the graph at the right, a combination of orifice size and chargepressurereliefsettingcanbeusedtoobtainthedesire cooling flow.

BLN-10121containsspecificinformationontheprocedurefor installing the relief valve and associated hardware in the Series 42 pump.

When a Series 42 pump is used with a loop flushing valve either located in a motor or installed remotely, the setting of the loop flushing valve should be equal to or less than the charge pressure setting of the pump.

WARNING

Incorrect charge pressure settings may result in the inability to build required system pressure and /or inadequate loop flushing flows. Correct charge pressuremustbemaintainedunderallconditionsofoperations to maintain pump control performance.

System (Loop) Ports

Loop Flushing Shuttle

Valve

Loop Flushing

Relief Valve

Loop Flushing Assembly

Relief Valve

			0 (psi)							100										200								300													400
<![if ! IE]> <![endif]>(L/min)	10																																																2.5
	8																											3																				2
	9
	7
<![if ! IE]> <![endif]>Flow																							Option
	6																																																1.5
																																		2
<![if ! IE]> <![endif]>Flushing	5																						Option
	4																																																1
	3
<![if ! IE]> <![endif]>Loop	2																																																0.5
	1																																																0 (gpm)
	0
	0						5			10										15								20										25			30
												Charge Pressure																				(bar)

Loop Flushing Flow

© Danfoss, 2013

BLN-10122 • Rev AA • September 2013

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