Артикул: RX7567
Directional servo-valves, with mechanical position feedback 4WS2EM 6…XL
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Description
- Size 6
- Component series 2X
- Maximum operating pressure 315 bar
- Maximum flow 48 l/min
- Area of application in accordance with the Explosion Protection Directive 2014/34/EU: II 3G
- Type of protection: Ex ic IIC T4 Gc according to EN IEC 60079-0 / EN 60079-11 and IEC 60079-0 / IEC 60079-11
Features
- 4 or 3-way version
- For intended use in potentially explosive atmosphere
- Valve to control position, force, pressure or velocity
- For subplate mounting
- Porting pattern according to ISO 4401-03-02-0-05 (but without locating hole)
- Dry control motor, no contamination of the solenoid gaps by the hydraulic fluid
- Wear-free control spool return element
- Pressure chambers at the control sleeve with gap seal, therefore no wear of the seal ring
Product description
Valves of type 4WS2EM ...XL are electrically operated, 2-stage directional servo valves. They are mainly used to control position, force, pressure or velocity.
The valves consist of an electro-mechanical converter (torque motor) (1), a hydraulic amplifier (nozzle flapper plate system) (2) and a control spool (3) in a sleeve (2nd stage), which is connected to the torque motor via a mechanical feedback.
An electrical input signal at the coils (4) of the torque motor generates a force by means of a permanent magnet which acts on the armature (5), and in connection with a torque tube (6) results in a torque. This causes the flapper plate (7) which is connected to the torque tube (6) via a bolt to move from the central position between the two control nozzles (8), and a pressure differential is created across the front sides of the control spool (3). The pressure differential results in the control spool changing its position, which results in the pressure port being connected to one actuator port and, at the same time, the other actuator port being connected to the return flow port.
The control spool (3) is connected to the flapper plate or the torque motor by means of a bending spring (mechanical feedback) (9). The position of the control spool (3) is changed until the feedback torque across the bending spring and the electro-magnetic torque of the torque motor are balanced and the pressure differential at the nozzle flapper plate system becomes zero.
The stroke of the control spool (3) and consequently the flow of the servo valve are controlled proportionally to the electrical input signal. It must be noted that the flow depends on the valve pressure drop.
External control electronics (separate order)
External control electronics (servo amplifier) serve the actuation of the valve, amplifying an analog input signal (command value) so that with the output signal, the servo valve is actuated in a flow-controlled form.
For the limitation of the electric data, a safety barrier is to be connected between valve and amplifier (see "Electrical connection").
Type code
| 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | ||
| 4 | WS2EM | 6 | - | 2X | / | B | 11 | XL | ET | K17 | V |
| 01 | 4 main ports | 4 |
| 02 | Servo directional valve, 2-stage, with mechanical feedback, for external control electronics, electrically operated | WS2EM |
| 03 | Size 6 | 6 |
| 04 | Component series 20 … 29 (20 … 29: unchanged installation and connection dimensions) | 2X |
| Nominal flow | ||
| 05 | 2 l/min | 2 |
| 5 l/min | 5 | |
| 10 l/min | 10 | |
| 15 l/min | 15 | |
| 20 l/min | 20 | |
| 25 l/min | 25 | |
| Observe "tolerance field of the flow/signal function", see "Characteristic curves" | ||
| 06 | Control sleeve exchangeable | B |
| 07 | Valves for external control electronics: Coil no. 11 (30 mA / 85 Ω per coil) | 11 |
| Explosion protection | ||
| 08 | "Type of protection ic", for details, please refer to the "information on explosion protection" | XL |
| Pilot oil flow | ||
| 09 | Pilot oil supply internal, pilot oil return internal | ET |
| Inlet pressure range | ||
| 10 | 10 … 210 bar | 210 |
| 10 … 315 bar | 315 | |
| Electrical connection | ||
| 11 | Without mating connector, with connector | K17 |
| Control spool overlap (in % of the nominal stroke) | ||
| 12 | 0 ... 0,5 % negativ | E |
| 0 ... 0,5 % positiv | D | |
| 3 ... 5 % positiv | C | |
| Seal material (observe compatibility of seals with hydraulic fluid used, see "Technical data") | ||
| 13 | FKM seals | V |
| Special versions | ||
| 14 | Standard version | no code |
| Without control (de-energized condition), the channels P → B and A → T are opened 10 % of the nominal flow. | -100 | |
| Channels P → A and B → T are open without control (de-energized condition) 10 % of the nominal flow. | -102 | |
Technical data
(For applications outside these values, please consult us!)
general
| Size | 6 | ||
| Weight | kg | 1.1 | |
| Installation position | any – Ensure that during start-up of the system, the valve is supplied with sufficient pressure (≥10 bar) | ||
| Ambient temperature range | °C | -30 … +80 | |
| Storage temperature range | °C | +5 … +40 | |
| Maximum storage time | yrs | 1 | |
| Surface protection | Valve body, cover, filter screw | nitro-carburated | |
| Cap | anodized | ||
hydraulic
| Maximum operating pressure | Anschluss A | bar | 315 | |||||
| Port B | bar | 315 | ||||||
| Port P | bar | 315 | ||||||
| Operating pressure range | bar | 10 … 210 or 10 … 315 | ||||||
| Maximum return flow pressure | Port T | bar | Pressure peaks < 100, static < 10 | |||||
| Hydraulic fluid | see table "Hydraulic fluid" | |||||||
| Hydraulic fluid temperature range | Recommended | °C | -15 … +80 | |||||
| preferably | °C | +40 … +50 | ||||||
| Viscosity range | Recommended | mm²/s | 15 … 380 | |||||
| preferably | mm²/s | 30 … 45 | ||||||
| Zero flow | l/min | see "diagrams/characteristic curves" | ||||||
| Rated flow (tolerance ±10 % with valve pressure differential ∆p = 70 bar) | l/min | 2 | 5 | 10 | 15 | 20 | 25 | |
| Maximum admissible degree of contamination of the hydraulic fluid, cleanliness class according to ISO 4406 (c) 1) | Class 18/16/13 | |||||||
| Maximum control spool stroke at mechanical end position (in case of error) related to nominal stroke | % | 120 ... 170 | ||||||
| Pressure amplification with 1 % control spool stroke change (from the hydraulic zero point) 2) | % | ≥ 50 | ||||||
| Feedback system | mechanical | |||||||
| 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. |
| 2) | pP = operating pressure in bar |
| 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 | NBR, FKM | ISO 15380 | 90221 |
| HEES | FKM | ||||
| Soluble in water | HEPG | FKM | ISO 15380 | ||
| Important information on hydraulic fluids:
| |||||
static / dynamic
| Hysteresis (dither-optimized) | % | ≤ 1.5 | |
| Range of inversion (dither-optimized) | % | ≤ 0.2 | |
| Response sensitivity (dither-optimized) | % | ≤ 0.2 | |
| Zero adjustment flow over the entire operating pressure range 1) | % | ≤ 3 | |
| Zero shift upon change of | Hydraulic fluid temperature | %/20° C | ≤ 1 |
| Ambient temperature | %/20° C | ≤ 1 | |
| Operating pressure 80 … 120 % of pP 2) | %/100 bar | ≤ 2 | |
| Return flow pressure 0 … 10 % of pP | %/bar | ≤ 1 | |
| 1) | long-term ≤ 5% |
| 2) | pP = operating pressure in bar |
electrical
| Type of signal | analog | |
| Coil resistance | Ω | 85 |
| Rated current 1) | mA | 30 |
| Protection class according to EN 60529 | IP65 (If a suitable and a correctly mounted mating connector are used.) | |
| 1) | Command value 100 % |
Notice:
In case of control using non-Rexroth amplifiers, we recommend a superimposed dither signal.
Information on explosion protection
| Area of application according to directive 2014/34/EU | II 3G | |
| Valve solenoid type of protection according to EN IEC 60079-0 / EN 60079-11 | Ex ic IIC T4 Gc | |
| "IECEx Certificate of Conformity" | IECEx BVS 1845 X |
Special application conditions for a safe application
See ambient and hydraulic fluid temperature range
Notices:
- Power supply of the valve only by certified, intrinsically safe electric circuits. Maximum values see "Electrical connection".
- The external servo amplifier and the safety barrier must be operated outside the potentially explosive area.
Diagrams/characteristic curves
(measured with HLP32, ϑOil = 40 ±5 °C)
Tolerance field of the flow/signal function with constant valve pressure differential Δp
Standard
Tolerance field of the flow/signal function with constant valve pressure differential Δp
Special version "-100"
Tolerance field of the flow/signal function with constant valve pressure differential Δp
Special version "-102"
| 1 | Tolerance field |
| 2 | Typical flow curve |
Flow/load function
(Tolerance ±10 %) with 100 % command value signal
Notices:
- Flow values in the maximum command value range (see tolerance field of the flow/signal function)
- ∆p = pP – pL – pT
- ∆p valve pressure differential
pP inlet pressur
pL load pressure
pT return flow pressure
Zero flow
(with spool overlap "E", measured without dither signal)
Transition function with pressure rating 315 bar, step response without flow
Frequency response with pressure rating 315 bar, stroke frequency without flow
(measured with pilot pressure pSt = 315 bar)
Dependency of the frequency f at -90° of the operating pressure and the inlet amplitude
| 1) | Correction factors with qV nom: 25 l/min – 1 20 l/min – 1 15 l/min – 0.95 10 l/min – 0.90 5 l/min – 0.85 2 l/min – 0.80 |
Notice:
The output signal corresponds to the control spool stroke with flow without load pressure.
Symbols/Circuit diagrams
|
| Control spool overlap | |
| "E" | "C"; "D" | |
| Standard |  |  |
| Special version "-100" |  |  |
| Special version "-102" |  |  |
Notice:
Representation according to ISO 1219-1.
Electrical connection
Parallel connection
| Power supply of the valve only from intrinsically safe electric circuits with the following maximum value | Umax | V | 15 |
| Imax | mA | 153 | |
| Pmax | mW | 570 | |
| Recommended safety barrier | 9001/02-133-150-101 (company Stahl) or Z915 (company Pepperl+Fuchs) | ||
Individual control
| Power supply of the valve only from intrinsically safe electric circuits with the following maximum value | Umax | V | 9,3 | 12,5 |
| Imax | mA | 205 | 90 | |
| Pmax | mW | 476 | 282 | |
| Recommended safety barrier | 9002/77-093-300-001 (company Stahl) | Z966 (company Pepperl+Fuchs) | ||
| 1 | Servo amplifier |
| 2 | Safety barrier |
| 3 | Valve, coil A |
| 4 | Valve, coil B |
| 5.1 | Non-explosive area |
| 5.2 | Explosive area |
Notices:
- Only use approved cables and lines for intrinsically safe electric circuits.
- The electrical control with plus (+) at A and B and minus (-) at C and D provides for the direction of flow P → A and B → T. Reverse electrical control provides for the direction of flow P → B and A → T. The pins E, F and PE at the connector are not connected.
Dimensions
Dimensions in mm
 Required surface quality of the valve contact surface |
| 1 | Space required for removing the mating connector, additionally observe the bending radius of the connection line |
| 2 | Cap |
| 3 | Valve mounting screws (included in the scope of delivery) |
| 4 | Identical seal rings for ports A, B, P, T |
| 5 | Name plate |
| 6 | Mating connectors, separate order, see "Accessories" |
| 7 | Connection line, further information on "Electrical connection" |
| 8 | Filter |
| 9 | Plug screw |
| 10 | Machined valve contact surface; porting pattern according to ISO 4401-03-02-0-05 (but without locating hole) |
Valve mounting screws (included in the scope of delivery)
| Size | Quantity | Hexagon socket head cap screws | Material number |
| 6 | 4 | ISO 4762 - M5 x 50 - 10.9 (Friction coefficient μtotal = 0.09 … 0.14) Tightening torque MA = 7 Nm ±10 % | – |
Notice:
Only use valve mounting screws with the listed thread diameters and strength properties. Observe the screw-in depth.
Subplates (separate order) with porting pattern according to ISO 4401-03-02-0-05, see data sheet 45100.
Notices:
- Subplates are no components in the sense of directive 2014/34/EU and can be used after the manufacturer of the overall system has conducted an assessment of the risk of ignition. The "G...J3" versions are free from aluminum and/or magnesium and galvanized.
- The dimensions are nominal dimensions which are subject to tolerances.
Accessories
Flushing plate with porting pattern according to ISO 4401-03-02-0-05
Dimensions in mm
Ordering code and further information:
- Material number R901541300
- Weight 0,6 kg
- Identical seal rings for ports A, B, P, T
- Mounting screws (included in the scope of delivery)
- 4 hexagon socket head cap screws ISO 4762 - M5 x 40 - 10.9
- (Friction coefficient μtotal = 0.09 … 0.14)
- Tightening torque MA = 7 Nm ±10 %
- For reasons of stability, exclusively the specified valve mounting screws may be used.
Notice:
Before assembly and operation, please observe the information in the operating instructions.
Valve amplifiers for servo-valves
VT 11021-1X
Valve amplifiers for servo-valves
VT 11021-1X
- Component series 1X
- Analog, Modular design
- For valves: 4WS2EM 6-2X, 4WS2EM 10-5X and 4WS2EM 16-2X
Mating connectors for valves with round connector, 6-pole, connection compatible with VG 95328 (for servo valves)
6P KPTC6
Mating connectors for valves with round connector, 6-pole, connection compatible with VG 95328 (for servo valves)
6P KPTC6
- For valves with round connector according to EN 175201-804, 6-pole + PE as well as 6-pole, compatible with VG 95328
Ordering codes
Downloads
 | Directional servo valve with mechanical position feedback Manual | RE29564-XL-B | 2020-09-01 | English | PDF | 1.5MB Product Groups: Proportional, high-response and servo valves Type 4WS2EM 6...XL... |
| Directional servo valve with mechanical position feedback Data Sheet | RE29564-XL | 2020-11-01 | English, United States | PDF | 757k Product Groups: Directional servo-valves Type 4WS2EM ...XL |
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