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Description
- Size 25
- Component series 3X
- Maximum operating pressure 350 bar
- Maximum flow 360 l/min
Features
- Sandwich plate valve
- Porting pattern according to ISO 4401-08-08-0-05
- For limiting the main or pilot flow of two consumer ports
- Adjustment type: Spindle with hexagon socket
- For supply or discharge throttling
- Corrosion-protected design
Product description
The valve type Z2FS is a throttle check valve in sandwich plate design. It is used for the flow limitation of one or two actuator ports.
Two symmetrically arranged throttle check valves limit flows (by adjustable throttle spools) in one direction and allow free return flow in the opposite direction.
In case of supply throttling, the hydraulic fluid is directed through channel A➀ via throttling point (1) to actuator A➁. The throttle spool (2.1) can be axially adjusted via the spindle (3) for adjustment of the throttling point (1).
Simultaneously, the hydraulic fluid in channel A➀ is directed via the bore (4) to the piston side (5). The active pressure and the spring force retain the throttle spool (2.1) in throttle position.
The hydraulic fluid return flow from actuator B➁ displaces the throttle spool (2.2) and enables the unobstructed flow as check valve. Depending on the version ("S" or "S2"), the throttling effect may occur in supply or discharge.
Flow limitation
For actuator velocity adjustment, the throttle check valve is installed between the directional valve and the subplate.
Supply throttling
| ① | component side |
| ② | plate side |
Type code
| 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | ||
| Z2FS | 22 | 8 | – | 3X | / | * |
| 01 | Throttle check valve, sandwich plate design | Z2FS |
| 02 | Size 25 | 22 |
| 03 | Throttle check valve side A and B | – |
| Throttle check valve side A | A | |
| Throttle check valve side B | B | |
| Adjustment type | ||
| 04 | Spindle with internal hexagon | 8 |
| 05 | Component series 30 ... 39 (30 ... 39: unchanged installation and connection dimensions) | 3X |
| 06 | Supply throttling | S |
| Discharge throttling | S2 | |
| Corrosion resistance (outside) | ||
| 07 | None (valve housing primed) | no code |
| Improved corrosion protection (240 h salt spray test according to EN ISO 9227) | J3 | |
| Seal material | ||
| 08 | NBR seals | no code |
| FKM seals | V | |
| Observe compatibility of seals with hydraulic fluid used. (Other seals upon request) | ||
| 09 | Further details in the plain text | * |
Technical data
general
| Size | 25 | ||
| Weight (approx.) | kg | 8 | |
| Installation position | any | ||
| Ambient temperature range | NBR seals | °C | -30 … +50 |
| FKM seals | °C | -20 … +50 | |
hydraulic
| Size | 25 | ||
| Maximum operating pressure | bar | 350 | |
| Maximum flow | l/min | 360 | |
| Hydraulic fluid | see table | ||
| Hydraulic fluid temperature range | NBR seals | °C | -30 … +80 |
| FKM seals | °C | -20 … +50 | |
| Viscosity range | mm²/s | 2.8 … 380 | |
| Maximum admissible degree of contamination of the hydraulic fluid, cleanliness class according to ISO 4406 (c) 1) | Class 20/18/15 | ||
| 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. For the selection of the filters, see www.boschrexroth.com/filter. |
| 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 1) | NBR, FKM | ISO 15380 | 90221 |
| HEES 1) | FKM | ||||
| Soluble in water | HEPG 1) | FKM | ISO 15380 | ||
| Flame-resistant | Water-free | HFDU (glycol base) | FKM | ISO 12922 | 90222 |
| HFDU (ester base) 1) | FKM | ||||
| HFDR | FKM | ||||
| Containing water | HFC (Fuchs Hydrotherm 46M, Petrofer Ultra Safe 620) 1) | NBR | ISO 12922 | 90223 | |
| Important information on hydraulic fluids:
| |||||
| 1) | Not recommended for corrosion-protected version "J3" (contains zinc) |
(For applications outside these values, please consult us!)
Diagrams/characteristic curves
(measured with HLP46, ϑOil = 40 ±5 °C)
Δp-qV characteristic curves
Via check valve with closed throttle
Δp-qV characteristic curves
Constant throttle position
Symbols/Circuit diagrams
| ① | component side |
| ② | plate side |
Supply throttling "S"
Version "-"
Version "A"
Version "B"
Discharge throttling "S2"
Version "-"
Version "A"
Version "B"
Dimensions
Dimensions in mm
 |
| Required surface quality of the valve contact surface |
| 1 | Name plate |
| 2 | Adjustment type "8“ Spindle for changing the flow cross-section (internal hexagon SW6)
|
| 3 | Through holes for valve mounting |
| 4 | Identical seal rings for ports A, B, P, T |
| 5 | Identical seal rings for ports X, Y, L |
| 6 | Locking pin (included in the scope of delivery) |
| 7 | Hexagon SW22, tightening torque MA = 25 Nm |
| 8 | Porting pattern according to ISO 4401-08-08-0-05 |
| 9.1 | Plug screw with version "B" |
| 9.2 | Plug screw with version "A" |
Valve mounting screws (separate order)
| Size | Quantity | Hexagon socket head cap screws | Material number |
| 25 | 6 | ISO 4762 - M12 - 10.9-flZn-240h-L | - |
Notice:
Length and tightening torque of the valve mounting screws must be calculated according to the components mounted under and over the sandwich plate valve.
Downloads
 | Throttle check valve Data Sheet | RE27536 | 2018-04-01 | English | PDF | 279k Product Groups: Throttle valves Type Z2FS |
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