LR3/Disco 3
The fuel induced by the ITP (5) is conveyed to the VCV (4) and the lubricating valve (14).
When the VCV is closed, the ITP pressure relief valve (2), lying parallel to the transfer pump, opens and conveys the fuel
back to the LP side (1) of the transfer pump.
The fuel passes through the lubricating valve (14) into the interior of the HPP and from there to the fuel return (D). The
fuel is used to lubricate the pump.
The VCV (4) determines the quantity of fuel (B) that is supplied to the pumping elements (13).
The fuel from the HP outlets (11) of the three pumping elements comes together in a ring line (12) and is conveyed
through the HP outlet of the HPP ©) to the rails.
The PCV (7) regulates the fuel pressure in the fuel rails. Reducing rail pressure via the PCV results in fuel from the rail
returning to the LP fuel return (D).
3
-
Screen filter
4
-
VCV
5
-
ITP
6
-
Edge filter (to protect PCV)
7
-
PCV
8
-
N/A
9
-
Eccentric on HPP drive shaft
10
-
Pumping element inlet valve
11
-
Pumping element outlet valve
12
-
HP ring line
13
-
HPP elements (3 of)
14
-
Lubricating valve
Item Part Number
Description
A
-
Pump pressure (bar)
B
-
Pump speed (rpm)
