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Description
- Size 6
- Component series 4X
- Maximum primary operating pressure 315 bar
- Maximum flow 50 l/min
- Area of application in accordance with the Explosion Protection Directive 2014/34/EU: I M2; II 2G
- Type of protection of the valve solenoids: c (EN 13463-5)
Features
- As sandwich plate valve
- Porting pattern according to ISO 4401-03-02-0-05 (but without locating hole)
- Check valve, optional
Product description
The valve type ZDR 6 D...XC is a direct operated pressure reducing valve in sandwich plate design and 3-way version, i. e. with pressure limitation of the secondary circuit.
It is used to reduce a system pressure. The pressure reducing valve mainly consists of housing (1), control spool (2), compression spring (3), adjustment type (4) and, optionally, a check valve.
The secondary pressure is set via the adjustment element (4).
Version "DA"
In its initial position, the valve is open. Hydraulic fluid can flow from channel A① to channel A② without obstructions. Simultaneously, the pressure in channel A② is applied to the piston area opposite the compression spring (3) via the control line (5). If the pressure in channel A② exceeds the value set at the compression spring (3), the control spool (2) moves to control position and keeps the pressure set in channel A② at a constant level. Control signal and pilot oil come internally via the control line (5) from channel A②.
If the pressure in channel A② increases further due to an external force effect at the actuator, it pushes the control spool (2) even further against the compression spring (3). In this way, channel A② is connected to the tank via the control edge (9) at the control spool (2). So much hydraulic fluid flows into the tank that the pressure does not increase any further. The leakage oil drain from the spring chamber (7) is always external via the bore (6) to channel T (Y). The secondary pressure can be controlled at the valve via a pressure gauge connection (8).
A check valve can be used for free flow back from channel A② to A① only with version "DA".
Version "DP" and "DB"
With version DP, the pressure reduction occurs in channel P①. Control signal and pilot oil come internally from channel P①.
With version DB, the pressure in channel P① is reduced; the pilot oil, however, is tapped internally from channel B.
Notices:
With version DB, it must be ensured that the pressure in channel B does not exceed the set pressure if the directional valve is in spool position P to A. Otherwise, there will be a pressure reduction in channel A.
Type ZDR 6 DA1-4X/...XCYM
Type code
| 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | ||
| Z | DR | 6 | 1 | – | 4X | / | Y | XC |
| 01 | Sandwich plate valve | Z |
| 02 | Pressure reducing valve, direct operated | DR |
| 03 | Size 6 | 6 |
| Pressure reduction in | ||
| 04 | Channel A②, pilot oil tapping in channel A | DA |
| Channel P①, pilot oil tapping in channel B | DB | |
| Channel P①, pilot oil tapping in channel P | DP | |
| Adjustment type | ||
| 05 | Rotary knob | 1 |
| 06 | Component series 40 … 49 (40 … 49: unchanged installation and mounting dimensions) | 4X |
| Maximum secondary pressure | ||
| 07 | 25 bar | 25 |
| 75 bar | 75 | |
| 150 bar | 150 | |
| 210 bar | 210 | |
| Pilot oil flow | ||
| 08 | Internal pilot oil supply, external leakage oil drain | Y |
| 09 | With check valve 1) | no code |
| Without check valve | M | |
| Explosion protection | ||
| 10 | "Structural safety", for details, please refer to the "Information on explosion protection" | XC |
| Seal material | ||
| 11 | NBR seals | no code |
| FKM seals | V | |
| Observe compatibility of seals with hydraulic fluid used. (Other seals upon request) | ||
| 1) | only with version "DA" |
Technical data
(For applications outside these values, please consult us!)
general
| Size | 6 | ||
| Installation position | any | ||
| Ambient temperature range | NBR seals | °C | -30 … +80 |
| FKM seals | °C | -20 … +80 | |
| Storage temperature range | NBR seals | °C | -30 ... +80 |
| FKM seals | °C | -20 ... +80 | |
| Weight | kg | 1.2 | |
| Surface protection | Standard: Coating, layer thickness max. 100 μm | ||
hydraulic
| Size | 6 | ||
| Maximum primary operating pressure | bar | 315 | |
| Maximum secondary pressure 1) | bar | 25 75 150 210 | |
| Maximum counter pressure | Port T (Y) | bar | 160 |
| Maximum flow | l/min | 50 | |
| Hydraulic fluid | see table "Hydraulic fluid" | ||
| Hydraulic fluid temperature range | NBR seals | °C | -30 … +80 |
| FKM seals | °C | -20 … +80 | |
| Viscosity range | mm²/s | 10 … 800 | |
| Maximum admissible degree of contamination of the hydraulic fluid 2) | Class 20/18/15 according to ISO 4406 (c) | ||
| 1) | To avoid exceeding the maximum admissible secondary pressure, the pressure must be checked using a suitable measuring device during adjustments. |
| 2) | 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. For the selection of the filters, see www.boschrexroth.com/filter. |
| Hydraulic fluid | Classification | Suitable sealing materials | Standards | Data sheet |
| Mineral oils | HL, HLP | NBR, FKM | DIN 51524 | 90220 |
| Important information on hydraulic fluids:
| ||||
Information on explosion protection
| Area of application according to directive 2014/34/EU | IM2, II2G | |
| Type of protection valve | c (EN 13463-5) | |
| Maximum surface temperature 1) | °C | 125 |
| Temperature class | T4 | |
| 1) | Due to the arising surface temperatures of the solenoid coils, the standards ISO 13732-1 and ISO 4413 are to be observed. |
Diagrams/characteristic curves
(measured with HLP46, ϑOil = 40 ±5 °C)
pA-qV characteristic curves
Version "DA"
pA-qV characteristic curves
Version "DB" and "DP"
Notices:
- The curve development is maintained according to the pressure rating if a lower pressure is set.
- The characteristic curves for the pressure relief function apply to an output pressure = 0 over the entire flow range.
Δpmin-qV characteristic curves
Δp-qV characteristic curves
Symbols/Circuit diagrams
Version "DP…YM"
Version "DA…YM"
Version "DB…YM"
Version "DA…Y"
| ➀ | component side |
| ➁ | plate side |
Dimensions
load errorDownloads
 | Explosion-protected hydraulic products for industrial and mobile applications Brochure | R999000373 | 2017-03-01 | English | PDF | 5.8MB Product Groups: Pumps, CD - single rod cylinder, Proportional, high-response and servo valves, Axial piston pumps, Mobile controls Product overview |
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