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Description
- Size 10 … 25
- Component series 4X
- Maximum operating pressure 315 bar
- Maximum flow 300 l/min
Features
- For threaded connection
- 4 adjustment types for pressure adjustment, optionally
• Rotary knob
• Sleeve with hexagon and protective cap
• Lockable rotary knob with scale
• Rotary knob with scale - 4 pressure ratings
- Solenoid-operated unloading via built-on directional spool valve
- CE conformity according to the Low-Voltage Directive 2014/35/EU for electrical voltages >50 VAC or >75VDC
Product description
Valves of type DBW are pilot-operated pressure relief valves. They are used for limitation and solenoid-actuated unloading of the operating pressure.
The valves basically consist of housing (1) and pilot control valve (2) with adjustment type.
The pressure applied to channel P acts on the main spool (3). Via the nozzle bores (4 and 5), the pressure is at the same time applied to poppet (6). If the pressure in channel P exceeds the value set at spring (7), poppet (6) opens against spring (7). Via the nozzle bores (4 and 5), the hydraulic fluid from channel P now flows into the spring chamber (8). From here, it is led into the tank internally (version "–"), via the control line (9 and 10), or externally (version "Y") via the control line (9 and 11).
Due to the state of equilibrium at the main spool (3), hydraulic fluid flows from channel P to channel T, maintaining the set operating pressure.
A pressure gauge connection (12) allows for the control of the operating pressure.
The pressure relief valve can be unloaded or switched to another pressure (second pressure rating) via port X (13).
The main spool (3) is unloaded by controlling a built-on directional valve.
| DB 20 –1-4X/…W65 |
Type code
| 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | ||
| DB | W | G | – | 4X | / | 6E | K4 | W65 | * |
| 01 | Pressure relief valve | DB |
| 02 | With attached directional valve | W |
| Size | ||
| 03 | Size 10 | |
| Threaded connection "G" (G1 1/2) | 10 | |
| Size 25 | ||
| Threaded connection "G" (G3/4) | 15 | |
| Threaded connection "G" (G1) | 20 | |
| Type of connection | ||
| 04 | Normally closed | A |
| Normally open | B | |
| 05 | Threaded connection | G |
| Adjustment type | ||
| 06 | Rotary knob | 1 |
| Sleeve with hexagon and protective cap | 2 | |
| Lockable rotary knob with scale | 3 1) | |
| Rotary knob with scale | 7 | |
| 07 | Component series 40 ... 49 (40 ... 49: unchanged installation and connection dimensions) | 4X |
| Pressure rating | ||
| 08 | Set pressure up to 50 bar | 50 |
| Set pressure up to 100 bar | 100 | |
| Set pressure up to 200 bar | 200 | |
| Set pressure up to 315 bar | 315 | |
| Pilot oil flow | ||
| 09 | Pilot oil supply internal, pilot oil return internal | – 2) |
| External pilot oil supply, internal pilot oil return | X | |
| Internal pilot oil supply, external pilot oil return | Y | |
| External pilot oil supply, external pilot oil return | XY | |
| 10 | Standard version | no code |
| Valve for minimum cracking pressure (not suitable for mutual relief!) | U | |
| 11 | With directional spool valve (data sheet 23178) | 6E |
| 12 | Direct voltage 24 V | G24 |
| Alternating voltage 230 V, 50/60 Hz | W230 | |
| Manual override | ||
| 13 | Without manual override | no code |
| With concealed manual override (standard) | N9 | |
| With manual override | N | |
| Electrical connection | ||
| 14 | Without mating connector; connector DIN EN 175301-803 | K4 |
| Seal material (observe compatibility of seals with hydraulic fluid used, see "Technical data") | ||
| 15 | NBR seals | no code |
| FKM seals | V | |
| 16 | Vertical installation position of the screw-in cartridge valve (cartridge) | W65 |
| 17 | Further details in the plain text | * |
| 1) | H-Key with material no. R900008158 is included in the scope of delivery. |
| 2) | Dash "–" only required for specifying "no code" for item 10. |
Notice:
In case spare parts of the screw-in cartridge valve are required, always order type DB 20 K.-1X/.XY.
Technical data
general
| Size | 10 | 25 | ||
| Weight | kg | 4.25 | ||
| Installation position | any | |||
| Ambient temperature range | NBR seals | °C | -20 … +50 | |
| FKM seals | °C | -15 … +50 | ||
| Conformity | CE according to Low-Voltage Directive 2014/35/EU tested according to | EN 60204-1:2006-01 and DIN VDE 0580, classified as component. | ||
hydraulic
| Size | 10 | 25 | ||||
| Maximum operating pressure | Port P | bar | 315 | |||
| Port X | bar | 315 | ||||
| Port T | bar | 315 | ||||
| Hydraulic fluid | see table "Hydraulic fluid" | |||||
| Hydraulic fluid temperature range | NBR seals | °C | -20 … +80 | |||
| FKM seals | °C | -15 … +80 | ||||
| Viscosity range | mm²/s | 10 … 800 | ||||
| Maximum admissible degree of contamination of the hydraulic fluid, cleanliness class according to ISO 4406 (c) 1) | Class 20/18/15 | |||||
| Maximum flow | G3/4 | G1 | ||||
| l/min | 150 | 200 | 300 | |||
| Maximum counter pressure | Port Y | DC solenoid | bar | 210 | ||
| AC solenoid | bar | 160 | ||||
| Port T | DC solenoid | bar | 210 | |||
| AC solenoid | bar | 160 | ||||
| Minimum set pressure | flow-dependent, see "characteristic curves" | |||||
| Maximum set pressure | bar | 50 100 200 315 | ||||
| 1) | The cleanliness classes specified for the components must be adhered to in hydraulic systems. Effective filtration prevents faults and simultaneously increases the life cycle of the components. |
| Hydraulic fluid | Classification | Suitable sealing materials | Standards | Data sheet | |
| Mineral oils | HL, HLP, HLPD, HVLP, HVLPD | NBR, FKM | DIN 51524 | 90220 | |
| Bio-degradable | Insoluble in water | HETG | FKM | ISO 15380 | 90221 |
| HEES | FKM | ||||
| Soluble in water | HEPG | FKM | ISO 15380 | ||
| Flame-resistant | Water-free | HFDU (glycol base) | FKM | ISO 12922 | 90222 |
| HFDU (ester base) | FKM | ||||
| HFDR | FKM | ||||
| Containing water | HFC (Fuchs: Hydrotherm 46M, Renosafe 500; | NBR | ISO 12922 | 90223 | |
| Important information on hydraulic fluids:
| |||||
Notice:
Technical data for directional spool valve see data sheet 23178.
(For applications outside these values, please consult us!)
Diagrams/characteristic curves
(measured with HLP46, ϑOil = 40 ±5 °C)
Inlet pressure dependent on the flow
Notices:
- The characteristic curves were measured with external, depressurized pilot oil return.
- Due to the internal pilot oil return, the inlet pressure increases by the output pressure present in port T.
Minimum set pressure and circulation pressure dependent on the flow
Standard version
Minimum set pressure and circulation pressure dependent on the flow
Version “U”
Notices:
- The characteristic curves were measured with external, depressurized pilot oil return.
- Due to the internal pilot oil return, the inlet pressure increases by the output pressure present in port T.
- The characteristic curves apply to an output pressure pT =0 bar in the entire flow range.
Symbols/Circuit diagrams
| "DBW…–…" | "DBW…X…" | |
| Normally closed |  |  |
| Normally open | ||
| "DBW…Y…" | "DBW…XY…" | |
| Normally closed |  |  |
| Normally open |
Dimensions
Dimensions in mm
| 1 | Name plate |
| 2 | Port X for remote control, optional |
| 3 | Y port for pilot oil return, external |
| 4 | Adjustment type "1" |
| 5 | Adjustment type "2" |
| 6 | Adjustment type "3" |
| 7 | Adjustment type "7" |
| 8 | Lock nut SW22, tightening torque MA = 10±5 Nm |
| 9 | Hexagon SW10 |
| 10 | Hexagon SW30, tightening torque MA = 50 Nm |
| 11 | Space required to remove the key |
| 13 | Valve mounting screws |
| 17 | Grub screw is omitted with internal pilot oil return |
| 18 | Directional spool valve NG6 (data sheet 23178) |
| 19 | Mating connector without circuitry (separate order) |
| 20 | Mating connector with circuitry (separate order) |
| 21 | Dimension for valve without manual override |
| 22 | Dimension for valve with manual override "N" |
| 23 | Dimension for valve with concealed manual override "N9" |
| 25 | Space required to remove the mating connector |
| 26 | Valve contact surface; port A is not bored |
| 27 | Space required to remove the solenoid coil |
| Version | D1 | ØD2 |
| mm | ||
| DB.10.G | G1/2 | 34 |
| DB.15.G | G3/4 | 42 |
| DB.20.G | G1 | 47 |
Information
General information
- The relief function must not be used for safety functions.
- With version "B", the lowest adjustable pressure (circulation pressure) is set in case of power failure or cable break. With version "A", the pressure limiting function is set in case of power failure or cable break.
- Hydraulic counter pressures in port T with internal pilot oil return and/or port Y with external pilot oil return add 1:1 to the response pressure of the valve set at the pilot control.
Example:
Pressure adjustment of the valve by spring preload in the pilot control valve/adjustment type
pspring = 200 bar
Hydraulic counter pressure in port T with internal pilot oil return phydraulic = 50 bar
=> Response pressure = pspring + phydraulic = 250 bar
Accessories
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)
Mating connectors for valves with connector “K4”, with indicator light
3P Z5L
Mating connectors for valves with connector “K4”, with indicator light
3P Z5L
- 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)
Mating connectors for valves with connector “K4”, with indicator light and Zener diode suppression circuit
3P Z5L1
Mating connectors for valves with connector “K4”, with indicator light and Zener diode suppression circuit
3P Z5L1
- 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)
Mating connectors for valves with connector “K4”, with rectifier
3P RZ5
Mating connectors for valves with connector “K4”, with rectifier
3P RZ5
- 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)
Downloads
 | Pressure relief valve, pilot-operated Data Sheet | RE25818 | 2021-10-01 | English, United States | PDF | 857k Product Groups: Pressure relief valves Type DB…W65; DBW…W65; DB 20 K |
| Pressure relief valve, pilot-operated Manual | RE25818-B | 2021-11-01 | English | PDF | 404k Product Groups: Industrial Hydraulics Type DB20K.1X/...E |
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