PRESSURE REDUCING VALVE DRE20-6X/100YG24-8K4M
Manufacturer: Bosch Rexroth
Material #: R901387378
Model : DRE20-6X/100YG24-8K4M
***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Bosch Rexroth directly.***
The Bosch Rexroth DRE20-6X/100YG24-8K4M (R901387378) is an industrial hydraulic valve designed for high-performance applications requiring reliable pressure reduction to a set command value. This valve features a size 6 CETOP D subplate mounting design, with a maximum operating pressure of 315 bar and a maximum flow rate of 100 liters per minute. The electrical actuation is achieved through an external amplifier, ensuring precise control over the system's pressure levels.
The DRE20-6X/100YG24-8K4M operates with a proportional solenoid, which includes a rotatable and detachable coil for ease of maintenance and adjustment. The solenoid's function is to regulate the pilot control valve, which in turn manages the main valve spool insert to modulate pressure accurately. An optional check valve can be installed between ports A and B for additional system protection.
This model is equipped with NBR seals and is compatible with hydraulic fluids such as HL, HLP, HLPD, HVLP, HVLPD, and HFC. It features an electrical connection via a Connector pole PE according to DIN EN standards. The valve offers a third way from port A to Y with a 1.3 mm diameter orifice for controlled pressure relief.
The DRE20-6X/100YG24-8K4M boasts a linearized pressure-command value characteristic curve that ensures good transient response during operation. For systems requiring safeguards against excessive pressures caused by high electric control currents at the proportional solenoid, an optional spring-loaded pressure relief valve can be integrated as maximum pressure limitation.
Overall, this Bosch Rexroth valve provides precise control over hydraulic system pressures with options for customization based on specific application requirements. Its robust design and reliable performance make it suitable for various operations where controlled pressure reduction is critical.
$3,127.00 USD
More are expected on September 30, 2024
Status: This product is temporarily out of stock.
Qty: Delivered as early as September 30, 2024 when ordered in
This product is eligible for factory repair.
Size 20, B → A, electrical with external electronics, 24 VDC
Industrial hydraulic valve in a high performance range. Reliable reduction of the pressure to the command value signal.
Unpacked Weight: 5.980 kg
Valve for reducing a system pressure Operation by means of a proportional solenoid Proportional solenoid with rotatable and detachable coil For subplate mounting: porting pattern according to ISO 5781 Third way A to Y (Ø 7.5 mm) Linearized pressure/command value characteristic curve Good transient response Optional check valve between A and B Optional maximum pressure limitation
Valves of type DRE(M) are pilot-operated pressure reducing valves. They are used for operating pressure reduction.
These valves basically consist of a pilot control valve (1) with proportional solenoid (2), a main valve (3) with main spool insert (4), as well as an optional check valve (5).
Type DRE...
The pressure in channel A is set in a command value-dependent form via the proportional solenoid (2).
In rest position – no pressure in channel B –, the spring (17) holds the main spool (4) in its initial position. The connection from channel B to A is closed. A start-up jump is thereby prevented.
The pressure in channel A acts on the surface (7) of the main spool via the bore (6). The pilot oil is taken from channel B and flows through the bore (8) to the constant-current control (9) that keeps the pilot flow constant independent of the pressure drop between channel A and B. From
the constant-current control (9), the pilot flow flows in den spring chamber (10), through the bores (11) and (12) via the valve seat (13) into channel Y (14, 15, 16) and from there to the return flow. The pressure required in channel A is preset at the related amplifier. The proportional solenoid moves the valve poppet (20) in the direction of the valve seat (13) and limits the pressure in the spring chamber (10) to the set value. If the pressure in channel A is lower than the preset command value, the higher pressure in the spring chamber (10) moves the main spool to the right. The connection from B to A is opened. If the set pressure in A is reached, the forces at the main spool are balanced – the main spool is in control position.
Pressure in channel A • Spool face (7) = pressure in spring chamber (10) • Spool face – spring force (17)
If in a standing hydraulic fluid column (e. g. cylinder piston at stop), the pressure in A is to be reduced, (e. g.) a lower command value is preset at the control electronics and in this way a lower pressure is preselected which is present immediately in the spring chamber (10). The higher pressure in A which acts on the surface (7) of the main spool pushes the main spool to the stop against the plug screw (18). The connection A to B is blocked and A to Y is open. The force of the spring (17) now counteracts the hydraulic force acting on the surface (7) of the main spool. In this main spool position, the hydraulic fluid can flow from channel A via the control edge (19) to Y into the return flow.
When the pressure in A has dropped to the pressure in the spring chamber (10) plus ∆p from spring (17), the main spool closes the large control bores in the socket at the control edge A to Y.
The residual pressure differential of approx. 10 bar to the new command value pressure in A is now only unloaded via the fine control bore (21). In this way, a favorable transient response without pressure undershoot is achieved. For the free flow back from channel A to B, a check valve (5) can optionally be installed. Part of this flow from channel A simultaneously flows into the return flow via the open control edge (19) of the main spool A to Y.
Type DREM...
For hydraulic protection against an inadmissibly high electric control current at the proportional solenoid, which imperatively results in excessive pressures in port A, you can optionally install a spring-loaded pressure relief valve as maximum pressure limitation (22). The maximum pressure limitation is pre-set based on the relevant pressure rating (see table).
(measured with HLP46, ϑOil = 40 ±5 °C)
Pressure in port A dependent on the command value (flow = 0.8 l/min)
DRE(M)
| 1) | With type DRE(M), the manufacturing tolerance at the external analog amplifier can be adjusted using the command value attenuator potentiometer "Gw". With the digital amplifier, the setting is made using the "Limit" parameter. In this connection, the control current according to the technical data must not be exceeded! In order to match several valves to the same characteristic curve, at a command value of 100%, the pressure must not exceed the maximum set pressure of the relevant pressure rating at no valve. |
Pressure in channel A dependent on the flow qv
(characteristic curves with constant Δp)
Size 10
Pressure in channel A dependent on the flow qv
(characteristic curves with constant Δp)
NG25
Pressure differential from A to B via the check valve
Pressure differential from B to A
Pressure in channel A dependent on the command value
Pressure rating 50 bar
Pressure rating 100 bar
Pressure rating 200 bar
Pressure rating 315 bar
Pressure rating 200 bar (with VT-SSPA1)
Comparison series 5X-6X / pressure rating 100 bar (with amplifier VT-VSPA1-1-1X with 800 mA coil)
Comparison series 5X-6X / pressure rating 315 bar (with amplifier VT-VSPA1-1-1X with 800 mA coil)
Type DRE-6X/...YM...
Type DREM-6X/...YM...
Type DRE-6X/...Y...
Type DREM-6X/...Y...
Connection at mating connector
Connection at the connector
|
Size |
10 | 25 | ||
|
B1 |
mm |
85 | 102 | |
|
B2 |
mm |
66.7 | 79.4 | |
|
B3 |
58.8 mm | 73 mm | ||
|
B4 |
7.9 mm | 6.4 mm | ||
|
B5 |
84 mm | 97 mm | ||
|
B6 |
8.65 mm | 8.8 mm | ||
|
ØD1 |
mm |
15 | 25 | |
|
ØD2 |
H11 |
mm |
21.8 | 34.8 |
|
H1 |
mm |
171 | 185 | |
|
H2 |
mm |
123 | 137 | |
|
H3 |
mm |
58 | 64 | |
|
H4 |
mm |
36 | 44 | |
|
L1 |
mm |
42.9 | 60.3 | |
|
L2 |
mm |
35.8 | 49.2 | |
|
L3 |
mm |
31.8 | 44.5 | |
|
L4 |
mm |
21.5 | 20.6 | |
|
L5 |
mm |
7.2 | 11.1 | |
|
L6 |
21.5 mm | 39.7 mm | ||
|
L7 |
5 mm | 12.2 mm | ||
|
L8 |
116 mm | |||
|
L9 |
44.5 mm | 27.3 mm | ||
|
L10 |
59.5 mm | 42 mm | ||
|
L11 |
61 mm | 78 mm | ||
|
L12 |
9.05 mm | 8.85 mm | ||
|
T1 |
mm |
2 | 2.9 | |
|
1 |
Upon delivery, this port (G1/4) is closed. After removal of the blanking plug, an external and separate depressurized pilot oil return to the tank is, however, also possible here. |
|
2 |
Space required to remove the mating connector |
|
3 |
Name plate |
|
4 |
Blind counterbore |
|
5 |
Check valve, optional |
|
6 |
Locating pin |
|
7 |
Identical seal rings for ports A and B Identical seal rings for port Y and blind counterbore (pos. 4) |
|
8 |
Pilot oil return always external, separate and depressurized to the tank or optional at pos. 1 |
|
9 |
mating connector according to DIN EN 175301-803 |
|
10 |
Integrated electronics (OBE) |
|
11 |
Mating connector according to DIN EN 175201-804 |
|
12 |
Machined valve contact surface; Porting pattern according to ISO 5781-06-07-0-00 (NG10) and ISO 5781 -08-10-0-00 (NG25) |
|
13 |
Cable fastening |
|
14 |
Maximum pressure limitation with version DREM and DREME |
Recommended valve mounting screws (separate order):
4 hexagon socket head cap screws ISO 4762 - M10 x 45 - 10.9-flZn-240h-L
(Friction coefficient μtotal = 0.09 to 0.14)
Tightening torque MA = 59 Nm ± 10%
or
4 hexagon socket head cap screws ISO 4762 - M10 x 45 - 10.9
(Friction coefficient μtotal = 0.12 to 0.17)
Tightening torque MA = 75 Nm ± 10%
Notice:
The dimensions are nominal dimensions which are subject to tolerances.
Mating connectors for valves with connector “K4”, without circuitry, standard
3P Z4
Mating connectors for valves with connector “K4”, without circuitry, standard
3P Z4
For valves with connector “K4” according to EN 175301-803 and ISO 4400, 2-pole + PE, “large cubic connector” Mating connectors for valves with one or two solenoids (individual connection)Data sheet
Spare parts & repair
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