PRESSURE REDUCING VALVE DREM20-6X/315YG24-8K4M
Manufacturer: Bosch Rexroth
Material #: R901279590
Model : DREM20-6X/315YG24-8K4M
***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 DREM20-6X/315YG24-8K4M (R901279590) is a high-performance industrial hydraulic valve designed for reliable pressure reduction to a predetermined command value signal. This valve is characterized by its size B, and it utilizes electrical actuation with an external amplifier. It operates on a 24 V DC supply voltage and is capable of handling a maximum flow rate as specified in its technical documentation.
The DREM20-6X/315YG24-8K4M valve features a spool symbol B A, indicating the specific configuration of the spool within the unit. The maximum pressure this unit can withstand, along with its electrical connection specifications, including a connector pole PE according to DIN EN standards, are detailed in its product group information. It offers subplate mounting with a CETOP D size connection and adheres to the ISO connection diagram standard.
Equipped with NBR seals, this valve is compatible with various hydraulic fluids such as HL, HLP, HLPD, HVLP, HVLPD, and HFC. The unit's design includes a proportional solenoid for precise control and an optional check valve for added operational flexibility. To ensure safety and prevent overpressure conditions, there is an option to include a spring-loaded pressure relief valve as maximum pressure limitation.
This Bosch Rexroth valve boasts features like linearized pressure-command value characteristic curves for accurate pressure adjustments and good transient responses for smooth operation under changing conditions. Additional options such as check valves between ports A and B or maximum pressure limitations enhance the versatility of this component in various hydraulic systems.
Valves of type DREM are essential components in applications requiring precise pressure reduction from a higher system pressure to a set lower level while maintaining stability and responsiveness during dynamic load changes. The optional features allow customization to meet specific application requirements or safety protocols within industrial settings.
$3,314.00 USD
More are expected on November 14, 2024
Status: This product is temporarily out of stock.
Qty: Delivered as early as November 14, 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: 6.080 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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