Hydraulics Bosch Rexroth AG
RE 29184/06.11 3DREP; 3DREPE
3/12
Function, section
The 3-way pressure reducing valve type 3 DREP 6.. is direct
operated by proportional solenoids. It is used to convert an
electric input signal into a proportional pressure output signal.
The proportional solenoids are controllable wet-pin DC so-
lenoids with central thread and detachable coil. The so-
lenoids are optionally actuated by external control elec-
tronics (type 3DREP) or by the internal control electronics
(type 3DREPE).
Set-up:
The valve basically consists of:
– Housing (1) with connection surface
– Control spool (2) with pressure measuring spool (3, 4)
– Solenoids (5, 6) with central thread
– Optionally integrated control electronics (7)
Function:
The pressure in A or B is set by means of the proportional
solenoids. The amount of the pressure depends on the cur-
rent. With de-energized solenoids (5, 6), the control spool (2)
is held in the central position by means of the pressure
springs (8). Ports A and B are connected with T so that the
hydraulic fluid can flow off to the tank without obstructions.
By energizing a proportional solenoid e.g. solenoid "a" (5), the
pressure measuring spool (3) and with it the control spool (2)
are moved to the right. This opens the connection from P to
B and A to T via orifice-type cross-sections with progressive
flow characteristic. The pressure that builds up in channel B
acts with the surface of the pressure measuring spool (4) on
the control spool and against the solenoid force. The pres-
sure measuring spool (4) is supported by the solenoid "b". If
the pressure exceeds the value set at solenoid "a", the control
spool (2) is pushed back against the solenoid force and con-
nects B with T until the set pressure is achieved again. The
pressure is proportional to the solenoid current.
After shut-down of the solenoid, the control spool (2) is re-
turned into the central position by the compression springs (8).
An optional hand override (9, 10) allows for the displacement
of the control spool (2) without solenoid energization.
Note:
The unwanted activation of the hand override may lead to un-
controlled machine movements!
5
2
4
6
1
"a"
"b"
8
8
3
10
9
P
B
T
A
B
A
11
11
Type 3DREP 6..
Type 3DREPE 6..
Valve with 2 spool positions: (type 3DREP..A.. or 3DREP..B..)
The function of this valve design corresponds basically to
the valve with 3 spool positions. The 2 spool position valves
are, however, only equipped with solenoid "a" (5) or sole-
noid "b" (6). Instead of the 2nd proportional solenoid, there is
a plug screw (11).
Note:
The tank line must not be allowed to run empty.
With corresponding installation conditions, a pre-
charge valve (pre-charging pressure approx. 2 bar)
must be installed.
(28 pages)
(137 pages)
(16 pages)
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