Bosch Rexroth 4WS2EM 10 Series User manual

Explosion-proof
hydraulic valves
Type 4WS2EM 10...VH1...-100
Operating instructions
RA 29583-VH1-100-B0/05.12
Replaces: 05.10
Material Number
R901272980

1/14
Servo directional control valve
of 4-way design
Type 4WS2EM...VH1...-100
Nominal size 10
Unit series 5X
Maximum working pressure 315 bar
Maximum flow rate 180 l/min
RA 29583-VH1-100-B1/05.12
Replaces: 05.10
Information on explosion protection:
Ranges of application in accordance with Article 505, NEC ®
– IS Class I, Zone 0, AEx ia IIC T4
– NI Class I, Zone 2
– Ambient temperature range –20 °C ≤ Ta ≤ +60 °C
For potentially explosive atmospheres
Part I Technical Data Sheet
What you need to know about these Operating Instructions
These Operating Instructions apply to the explosion-proof version of Rexroth valves,
and consist of the following three parts:
Part I Technical Data Sheet RA 29583-VH1-100-B1
Part II Product-specific Instructions RA 29583-VH1-100-B2
Part III Control drawing RA 29583-VH1-100-B3
You can find further information on the correct handling of Rexroth hydraulic products in our publication
“General product information for hydraulic products”, RE 07008.
RA 29583-VH1-100-B0


H5893•_d

2/14 Bosch Rexroth AG Hydraulics 4WS2EM...VH1...-100 RA 29583-VH1-100-B1
Overview of Contents
Contents Page
Features 2
Ordering data and scope of delivery 3
Symbol 3
Function, sectional diagram 4
Technical data 5 and 6
Information on explosion protection 6
External trigger electronics 6
Plug-in connector 7
Electrical connection 7
Characteristic curves 8 to 11
Unit dimensions 12
Flushing plate 13
Features
– Servo directional control valve for proper use in potentially
explosive atmospheres of Zone 0
– Valve for closed-loop position, force and speed control
– 2-Stage servo valve with mechanical feedback
– 1st stage in the form of flapper nozzle amplifier
– For subplate mounting,
Mounting hole configuration to
ISO 4401-05-05-0-05 with ports X and Y.
Subplates, see page 12
– Dry servo motor, no contamination of solenoid gaps by
pressure fluid
– Non-wearing spool return element
– Actuation:
External trigger electronics in modular form, additional
safety barriers (order separately), see Page 6
– Valve is calibrated and tested
– Internal/external control oil supply and return individually
orderable
– Spool with flow force compensation
– Control sleeve permanently centered, therefore reducing
sensitivity to temperature and pressure
– Pressure chamber gaps on control sleeve sealed,
no wear to O-rings
– Filter for 1st stage freely accessible from the outside

Hydraulics Bosch Rexroth AG
RA 29583-VH1-100-B1 4WS2EM...VH1...-100 3/14
Ordering data and scope of delivery
Symbol
1) Nominal flow rate
The nominal flow is based on a 100 % setpoint signal at a
valve pressure drop of 70 bar (35 bar per metering edge).
The flow can be affected by other values.
A possible nominal flow tolerance of ± 10 % (see flow sig-
nal function on page 8) must be taken into consideration.
2) Electrical triggering data
The control signal must be generated by a current-regulat-
ed output stage with superimposed dither signal. For trigger
electronics (servo amplifiers), see page 6.
3) Control oil
The pilot pressure should be kept as constant as possible.
Therefore, external pilot control via port X can be advanta-
geous. The valve may be operated with higher pressure at
X than at P, to increase the dynamics.
Note:
Ports X and Y are also subject to pressure when the
supply and return of control oil are “internal”.
4) Supply pressure range
The system pressure should be kept as constant as pos-
sible.
Pilot pressure range: 10 ... 210 bar or 10 ... 315 bar.
With regard to the dynamics, the dependence on the
frequency response must be taken into account within the
permitted pressure range.
5) Spool overlap
The spool overlap is stated in % of the control spool stroke.
6) Non-standard version number “100”
When not actuated (power off), channel P → B and A → T
are open 10 % of the nominal flow.
Electrically operated
2-stage servo valve,
4-way version
for external = 4WS2E
trigger electronics
Mechanical feedback = M
Nominal size 10 = 10
Unit series 50 to 59 = 5X
(50 to 59: installation and connection
dimensions unchanged)
Nominal flow 1)
5 l/min = 5
10 l/min = 10
20 l/min = 20
30 l/min = 30
45 l/min = 45
60 l/min = 60
75 l/min = 75
90 l/min = 90
Valves for external trigger electronics:
Coil No. 11 (30 mA/85 Ω per coil) 2)
= 11
100 = Special
numbers 6)
V = FKM seals 6)
suitable for mineral oil
(HL, HLP) to DIN 51524
Spool overlap 5)
C = 3 … 5 % positive
D = 0 … 0,5 % positive
E = 0 … 0,5 % negative
Electrical connection
K31 = with plug
to EN175201-804
Plug-in connector – order separately
see Page 7
Supply pressure range to 1st stage 4)
210 = 10 … 210 bar
315 = 10 … 315 bar
Control oil supply and discharge 3)
– = External supply, external return
E = Internal supply, external return
T = External supply, internal return
ET = Internals supply, internal return
(ET = Standard version)
VH1 = Valve in explosion-proof design
For details, see information on explosion protection,
Page 6
4WS2E M 10 5X B 11 VH1 K31 V 100
Included in scope of delivery:
– Valve operating instructions
– Valve fastening screws
AB
TP
a, b

T
A
P
B
T1
6
3
2
4
5
1
9
7
8
4/14 Bosch Rexroth AG Hydraulics 4WS2EM...VH1...-100 RA 29583-VH1-100-B1
Function, sectional diagram
4WS2EM...VH1...-100
Valves of this type are electrically operated, 2-stage servo
directional control valves with a mounting hole configuration
to ISO 4401-05-05-0-05. They are predominantly employed
for closed-loop position, force and speed control.
These valves consist of an electro-mechanical converter
(torque
motor) (1), a hydraulic amplifier (flapper nozzle princi-
ple) (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
causes a permanent magnet to generate a force that acts on
the armature (5) and, acting by means of a torque tube (6),
this force generates a torque. This torque then moves the
flapper plate (7) - which is connected to the torque tube (6) by
a rod - out of its central position between the two control ori-
fices (8), resulting in a pressure drop at the end faces of the
control spool. This pressure drop causes the position of the
spool to change, so that the pressure port is connected to one
consumer port and, at the same time, the other consumer
port is connected to the return port. In this special version
”100” the valve is trimmed about 10% from P → B and A → T.
The control spool is connected to the flapper plate or the
torque motor by a feedback spring (mechanical feedback) (9).
The position of the spool continues to change until the return
torque through the feedback spring and the electro-magnet-
ic torque of the torque motor reach a state of equilibrium, and
the pressure drop at the flapper nozzle system becomes zero.
In this way, the stroke of the control spool and thus the flow of
the servo valve are closed-loop-controlled proportionately to
the electrical input signal. At the same time, it should be noted
that the flow is dependent on the valve pressure drop.
External trigger electronics (order separately)
The valve is actuated by external trigger electronics (a servo
amplifier), which amplifies an analog input signal (setpoint) so
that the controlled-current output signal is capable of driving
the servo valve.
Type 4WS2EM...VH1...-100

Hydraulics Bosch Rexroth AG
RA 29583-VH1-100-B1 4WS2EM...VH1...-100 5/14
Technical data
General
Mounting hole configuration ISO 4401-05-05-0-05
Installation position Optional (ensure that pilot control is certain to receive
sufficient pressure (≥10 bar) when starting
up the system!)
Surface protection Valve body, cover and filter screw Nitrocarburized
Cap Anodized
Storage temperature range °C –20 … +70
Ambient temperature range °C –20 … +60
Weight kg 3.56
Hydraulic
Working Control oil supply pilot stage bar 10 … 210 or 10 … 315
pressure: Main valve, ports P, A, B bar up to 315
Return pressure: Port T
Internal control oil return bar Pressure peaks < 100 permitted
External control oil return bar up to 315
Port Y bar Pressure peaks < 100 permitted, static < 10
Pressure fluid Mineral oil (HL, HLP) to DIN 51524, other pressure fluids
available on request, ignition temperature > 150 °C
Pressure fluid temperature range °C –15 … +60, preferably +40 … +50
Viscosity range mm2/s 15 … 380, preferably 30 … 45
Maximum permissible degree of contamination of
pressure fluid Purity class to ISO 4406 (c) Class 18/16/13 1)
Zero flow qV,L 2) with spool overlap E
measured without dither signal l/min
pP 4) L
70bar min
• 0.7 pP 4) L
70bar min
• 0.9 pP 4) L
70bar min
• 1.2 pP 4) L
70bar min
• 1.5 pP 4) L
70bar min
• 1.7
Nominal flow qv nom 3), Tolerance ±10%
at valve pressure drop ∆p = 70 bar
(35 bar per edge)
l/min 5 10 20 30 45 60 75 90
Max. possible control spool stroke based on
mechanical end position (in case of fault) referred
to nominal stroke
% 120 … 170 120 … 150
Return system mechanically
Hysteresis (dither optimized) % ≤ 1.5
Range of inversion (dither optimized) % ≤ 0.3
Response sensitivity (dither optimized) % ≤ 0.2
Pressure gain with 1 % spool stroke
variation (starting from hydr. zero) % of pP ≥ 30 ≥ 60 ≥ 80
Zero adjustment flow
over entire working pressure range % ≤ 3, long-term ≤ 5
Zero offset on variation of:
Pressure fluid temperature
% / 20 K ≤ 1
Ambient temperature
% / 20 K ≤ 1
Working pressure 80 … 120 % of pP
% / 100 bar ≤ 2
Return pressure 0 … 10 % of pP 4) % / bar ≤ 1
1) The purity classes stated for the components must be com-
plied with in hydraulic systems. Effective filtration prevents
problems and also extends the service life of components.
For a selection of filters, see www.boschrexroth.com/filter.
2) qV,L = zero flow in l/min
3) qv nom = nominal flow in l/min
4) pP = working pressure in bar

6/14 Bosch Rexroth AG Hydraulics 4WS2EM...VH1...-100 RA 29583-VH1-100-B1
Electrical
Degree of protection of valve to EN 60529 IP 65 with correctly mounted and secured plug-in connector
Type of signal analog
Nominal current per coil mA 30
Resistance per coil Ω 85
Inductance at 60 Hz and
100 % nominal current: Connection in parallel H 0.25
In case of actuation using non-Rexroth amplifiers, we recommend a superimposed dither signal
Technical data
Type test certification FM Approved
Range of application to according
Article 505, NEC ®
IS Class I, Zone 0, AEx ia IIC T4
NI Class I, Zone 2
Ambient temperature range °C –20 … +60
Pressure fluid temperature range °C –15 … +60
Valve is only supplied with power from
certified, intrinsically safe circuits
with the following maximum values
Umax V 9.3
Imax mA 390
Pmax mW 907
Conditions for use in Zone 0 The valve cap consists of cast aluminium.
When the valve is to be used as a Category 1 device in Zone
0, the valve cap must be protected in such a manner that no
ignitable sparks from friction, impact or grinding can be pro-
duced, even in the event of rarely occurring malfunctions.
Note:
The hydraulic fluid used must have an ignition temperature of
at least 150 °C.
Required free space for burst protection The specified free space for burst protection (see Page 12)
must remain free, in order that excess pressure occurring in
the event of a fault can be dissipated through the plug in the
valve cap.
Additional requirements for use in zone 0 Safety barrier required
Additional requirements for use in zone 2 May be used without safety barrier
Information on explosion protection
Servo amplifier 1) in modular design Analog Typ VT 11021 as per Technical Data Sheet RE 29743
Recommended safety barrier 1) Single-
channel Messrs. Stahl, Type 9001/02-093-390-101
Note:
The servo amplifier and safety barrier must be operated outside the potentially explosive atmosphere!
External trigger electronics
1) Order separately

ADB
C
//
A
n.c.
n.c.
n.c.
B
C
D
E
F
PE
PA PA
ADB
C
A
n.c.
n.c.
n.c.
B
C
D
E
F
PE
Hydraulics Bosch Rexroth AG
RA 29583-VH1-100-B1 4WS2EM...VH1...-100 7/14
Zone 0 Amplifier Safety barrier Valve: Coil A Coil B
Non-hazardous Hazardous atmosphere
atmosphere
A
B
C
D
E
F
Ø8…Ø13,5
85
Plug-in connector
Plug-in connector to EN 175201-804
Metal version
Order separately under Material No. R900223890
Safety barrier required
Note
Only approved cables and leads may be used for intrinsically
safe circuits.
The Entity Concept allows interconnection of intrinsically safe
apparatus with associated apparatus not specifically exam-
ined in combination as system when:
Vmax > Voc or Vt ; Imax > Isc or It ; Ca > Ci + Ccable;
La > Li + Lcabel
Control equipment connected to barrier must not use or
generate more than 250 Vrms or Vdc.
The configuration of associated apparatus must be
FM Approved.
Electrical connection
The electrical connection may only be connected in parallel.
The electrical actuation with positive (+) to A and B and negative (–) to C and D produces a volumetric flow direction of P → A
and B → T. Inverse electrical actuation produces a volumetric flow direction of P → B and A → T.
Pins E, F and PE on the plug are not connected.
Zone 2 Amplifier Valve: Coil A Coil B
Non-hazardous Hazardous atmosphere
atmosphere
Safety barrier not neccesary

5
10
20
30
40
70
100
50
200
1
2
3
4
5
6
7
8
3020
10 70
50
40 200 300
100
1
2
8
15
45
60
75
90
60
8/14 Bosch Rexroth AG Hydraulics 4WS2EM...VH1...-100 RA 29583-VH1-100-B1
Characteristic curves (measured with HLP 32, ϑoil = 40 °C ± 5 °C)
Order
code
Nominal flow
Curve
5 5 l/min 1
10 10 l/min 2
20 20 l/min 3
30 30 l/min 4
45 45 l/min 5
60 60 l/min 6
75 75 l/min 7
90 90 l/min 8
Flow - load function (tolerance ± 10 %) with 100 % setpoint signal
Note:
Observe flow values in the max. setpoint range (see tolerance zone of flow signal function)
Tolerance zone of flow signal function
at a constant metering edge pressure drop
Flow in l/min →
100
60
80
20
40
20
60
40
100
80
–20–40–60–80
4020 60 80
110
–100
100
110
10
P → A; B → T
P → B; A → T
Flow rate in %
Setpoint in %
Typical flow
curve
Tolerance
zone
∆p = valve pressure drop
(supply pressure pP minus
load pressure pL and
minus return pressure pT)
Valve pressure drop in bar →

Hydraulics Bosch Rexroth AG
RA 29583-VH1-100-B1 4WS2EM...VH1...-100 9/14
010
40
60
80
100
5
20
15
30
50
70
10
90
010
40
60
80
100
5
20
15 20
30
50
70
10
90
Characteristic curves (measured with HLP 32, ϑoil = 40 °C ± 5 °C)
Unit step response with pressure stage 315 bar, without flow (measured with safety barrier 1))
Spool stroke in % →
Time in ms →
Nominal flow 5, 10, 20 l/min Nominal flow 30 l/min
40 bar 70 bar 140 bar 210 bar 315 bar
Spool stroke in % →
Time in ms →
–30
–25
–20
–15
–10
–5
0
5
10 100 700
0
–45
–90
–135
–180
–225
–270
–315
50 500
20 200
–30
–25
–20
–15
–10
–5
0
5
10 100 700
0
–45
–90
–135
–180
–225
–270
–315
50 500
20 200
Frequency response with pressure stage 315 bar, stroke frequency response without flow (measured with safety barrier
1))
Gain in dB →
Frequency in Hz →
Phase angle in ° →
Gain in dB →
Frequency in Hz →
Phase angle in ° →
5% XeN 25% XeN 100% XeN
Nominal flow 5, 10, 20 l/min Nominal flow 30 l/min
0
10
20
30
40
50
60
70
80
90
100
50 100 150
200 250 300 325
0
10
20
30
40
50
60
70
80
90
100
50 100 150
200 250 300 325
Dependence of frequency f at –90 ° on working pressure p and input amplitude (measured with safety barrier 1))
Input amplitude in % →
Frequency at phase angle –90 ° in Hz →
40 bar 70 bar 140 bar 210 bar 315 bar
Nominal flow 5, 10, 20 l/min
Input amplitude in % →
Frequency at phase angle –90 ° in Hz →
Nominal flow 30 l/min
1) see pages 6 and 7 for information on the safety barrier

10/14 Bosch Rexroth AG Hydraulics 4WS2EM...VH1...-100 RA 29583-VH1-100-B1
020
40
60
80
100
10
20
30 40
30
50
70
10
90
020
40
60
80
100
10
20
30 40
30
50
70
10
90
Unit step response with pressure stage 315 bar, without flow (measured with safety barrier 1))
Spool stroke in % →
Time in ms →
Nominal flow 45 l/min Nominal flow 60 l/min
40 bar 70 bar 140 bar 210 bar 315 bar
Spool stroke in % →
Time in ms →
0
10
20
30
40
50
60
70
80
90
100
50 100 150 200 250 300 325
0
10
20
30
40
50
60
70
80
90
100
50 100 150 200 250 300 325
Dependence of frequency f at –90 ° on working pressure p and input amplitude (measured with safety barrier 1))
Input amplitude in % →
Frequency at phase angle –90 ° in Hz →
40 bar 70 bar 140 bar 210 bar 315 bar
Nominal flow 45 l/min
Input amplitude in % →
Frequency at phase angle –90 ° in Hz →
Nominal flow 60 l/min
Characteristic curves (measured with HLP 32, ϑoil = 40 °C ± 5 °C)
120 50 100
–25
–20
–15
–10
–5
0
5
300 700
–150
–120
– 90
– 60
– 30
10
0
–30
2120 50 100
–25
–20
–15
–10
–5
0
5
300 700
–150
–120
– 90
– 60
– 30
10
0
–30
2
Frequency response with pressure stage 315 bar, stroke frequency response without flow (measured with safety barrier 1))
Gain in dB →
Frequency in Hz →
Phase angle in ° →
Gain in dB →
Frequency in Hz →
Phase angle in ° →
Nominal flow 45 l/min Nominal flow 60 l/min
5% XeN 25% XeN 100% XeN
1) see pages 6 and 7 for information on the safety barrier

Hydraulics Bosch Rexroth AG
RA 29583-VH1-100-B1 4WS2EM...VH1...-100 11/14
030
40
60
80
100
10
20
20
30
50
70
10
90
50
40 030
40
60
80
100
10
20
20
30
50
70
10
90
60
40 50
Unit step response with pressure stage 315 bar, without flow (measured with safety barrier 1))
Spool stroke in % →
Time in ms →
Nominal flow 75 l/min Nominal flow 90 l/min
40 bar 70 bar 140 bar 210 bar 315 bar
Spool stroke in % →
Time in ms →
0
10
20
30
40
50
60
70
80
90
100
50 100
150 200 250 300 325
0
10
20
30
40
50
60
70
80
90
100
50 100
150 200 250 300 325
Dependence of frequency f at –90 ° on working pressure p and input amplitude (measured with safety barrier 1))
Input amplitude in % →
Frequency at phase angle –90 ° in Hz →
40 bar 70 bar 140 bar 210 bar 315 bar
Nominal flow 75 l/min
nput amplitude in % →
Frequency at phase angle –90 ° in Hz →
Nominal flow 90 l/min
Characteristic curves (measured with HLP 32, ϑoil = 40 °C ± 5 °C)
120 50 100
–25
–20
–15
–10
–5
0
5
700
–150
–120
– 90
– 60
– 30
10 0
–30 300
22
120 50 100
–25
–20
–15
–10
–5
0
5
300 700
–150
–120
– 90
– 60
– 30
10 0
–30
Frequency response with pressure stage 315 bar, stroke frequency response without flow (measured with safety barrier
1))
Gain in dB →
Frequency in Hz →
Phase angle in ° →
5% XeN 25% XeN 100% XeN
Nominal flow 75 l/min Nominal flow 90 l/min
Gain in dB →
Frequency in Hz →
Phase angle in ° →
1) see pages 6 and 7 for information on the safety barrier

12/14 Bosch Rexroth AG Hydraulics 4WS2EM...VH1...-100 RA 29583-VH1-100-B1
95
15 68
9,5
M6
80
60
64 32
96
10
31
54
24
102
127
12,5
46
65 3,7
9,5
P
AB
T1T
Y
X
578
10
1,5
6
2
4
min. 6
12
11
F1 F2
P
BA
T
F3
F4
105
25,5
68
11
T1
9
XY
Unit dimensions (Dimensions in mm)
1Cap
2Plug-in connector
(order separately, see page 7)
3Required space for removing plug-in connector,
note additional bending radius of connecting cable
4Exchangeable filter element with seals
Material no.: R961001950
5Profile seal for filter screw M16 x 1.5, part of item 4
6Nameplate
7Same seals for ports P, A, B, T and T1
8Same seals for ports X and Y
Ports X and Y are also subjected to pressure when
control oil is “internal”.
9Machined valve contact surface
Position of connections in accordance with
ISO 4401-05-05-0-05, T1 connection also be used
Rzmax 4
0,01/100
Required surface quality
of valve contact surface
10 Valve fastening screws
For strength reasons only the following
valve fastening screws may be used:
4 cheese-head bolts
ISO 4762-M6 x 70-10.9-flZn-240h-L
(Friction coefficient 0.09 - 0.14)
(Included in scope of delivery )
11 Burst protection
12 Free space for burst protection
Subplates
G 66/01 FE/ZN (G3/8)
G 67/01 FE/ZN (G1/2)
with ports X and Y:
G 535/01 FE/ZN (G3/4)
G 535/02 FE/ZN (M27 x 2)
G 536/01 FE/ZN (G1)
G 536/02 FE/ZN (M33 x 2)
with dimensions like in data sheet RE 45054 (must be or-
dered separately)

Hydraulics Bosch Rexroth AG
RA 29583-VH1-100-B1 4WS2EM...VH1...-100 13/14
9,5 40,5
46,5
TPX A B YT1
Flushing plate with mounting hole configuration to ISO 4401-05-05-0-05 (Dimensions in mm)
Symbol
– Material No. R900912450
– weight: 2 kg
– Same seals for ports P, A, B, T and T1
– Same seals for X, Y
– Fastening screws
For strength reasons only the following
valve fastening screws may be used:
4 cheese-head bolts
ISO 4762-M6 x 50-10.9-flZn-240h-L
(Friction coefficient 0.09 - 0.14)
(Included in scope of delivery )
Note
In order to ensure that the servo valves function perfectly,
it is essential to flush the system before commissioning it
into service.
For procedure see Product-specific Instructions
RA 29583-VH1-100-B2

Bosch Rexroth AG
Hydraulics
Zum Eisengießer 1
97816 Lohr am Main, Germany
Telefon [phone] / 18-0
[email protected]
www.boschrexroth.de
© This document, as well as the data, specifications and other informa-
tion set forth in it, are the exclusive property of Bosch Rexroth AG. It
may not be reproduced or given to third parties without its consent.
The data specified above only serve to describe the product. No state-
ments concerning a certain condition or suitability for a certain applica-
tion can be derived from our information. The information given does not
release the user from the obligation of own judgment and verification. It
must be remembered that our products are subject to a natural process
of wear and aging.
14/14 Bosch Rexroth AG Hydraulics 4WS2EM...VH1...-100 RA 29583-VH1-100-B1
Notes

1/16
Servo directional control valve
of 4-way design
RA 29583-VH1-100-B2/05.12
Replaces: 05.10
Type 4WS2EM...VH1...-100
Nominal size 10
Unit series 5X
Maximum working pressure 315 bar
Maximum flow rate 180 l/min
For potentially explosive atmospheres
Operating Instructions
Part II Product-specific Instructions
What you need to know about these Operating Instructions
These Operating Instructions apply to Rexroth explosion-proof valves and consist of the following
three parts:
Part I Technical Data Sheet RA 29583-VH1-100-B1
Part II Product-specific Instructions RA 29583-VH1-100-B2
Part III Control Drawing RA 29583-VH1-100-B3
For further information on the correct use of Rexroth hydraulic products please refer to our publication
General product information on hydraulic products, RE 07008.
RA 29583-VH1-100-B0
H5893•_d

4WS2EM...VH1...-100 | RA 29583-VH1-100-B22/16 Bosch Rexroth AG | Hydraulics
Contents Page
1 Scope of delivery 3
2 Using this manual 3
3 Basic safety advice 3
3.1 Liability, warranty 3
3.2 Responsibilities of the plant operator / user 3
3.3 Requirements for personnel, duty to take good care 4
3.4 Proper valve storage 4
3.5 Proper valve disposal 4
3.6 Special ancillary dangers and protective measures 5
4 Supplementary safety advice 6
4.1 Proper valve use, locations for installation 6
4.2 Improper valve use 6
4.3 Advice on valve use 6
4.4 Working safely on the valve 6
4.5 Information on the nameplate 7
5 Assembly and bringing into (first) use 8
5.1 Safety advice for assembly and bringing into (first) use 8
5.2 Before assembly 8
5.3 Assembly 8
5.4 Commissioning into first use, recommissioning 10
6 Disassembly 10
7 Trouble-shooting 11
8 Inspection and maintenance 12
9 Repairs and replacement parts 12
9.1 Safety instructions for repair work 12
9.2 Replacing the filter element 12
9.3 Rectifying external leaks 12
9.4 Available replacement parts 13
9.5 Contacts for repair and replacement parts 13
10 Accessories 14
10.1 Available accessories 14
10.2 Address for ordering accessories and valves 14

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RA 29583-VH1-100-B2 | 4WS2EM...VH1...-100 Hydraulics | Bosch Rexroth AG
3 Basic safety advice
3.1 Liability, warranty
Bosch Rexroth AG is not liable for damages that result from
non-compliance with or disregard of these Operating Instruc-
tions. Unauthorised tampering shall render the warranty null
and void.
If parts are replaced by similar parts, but not by identical
parts specified by the manufacturer, Bosch Rexroth AG shall
only assume liability if the scope of delivery was shown to be
faulty prior to the replacement of parts.
Please refer to our general terms of supply or your contract
for details of the guarantee and manufacturer’s warranty.
3.2 Responsibilities of the plant operator /
user
CAUTION
Mineral-oil-based hydraulic oil is hazardous to water
and flammable. It may only be used if the relevant safety
data sheet from the manufacturer is present and all the
measures stipulated therein have been implemented.
If there is a risk of oil leaking from hydraulic products
and contaminating water or the ground, the hydraulic
product in question must be placed in a suitable oil
collecting trough.
The operator is responsible for ensuring that
➢ the valve is used only in accordance with the proper use
as defined in these Operating Instructions,
➢ the valve is used only in accordance with the technical
data, ambient and operating conditions indicated in
these Operating Instructions, and in particular that the
limiting values given in the
Technical Data Sheet are not
exceeded,
➢ the applicable regulations, codes and standards on
explosion protection are complied with.
If the valve is part of another product, e.g. a hydraulic
system, then the person or organisation responsible for this
other product (e.g. the designer/constructor of the system)
shall ensure that
➢ the valve is used only in accordance with the proper use
as defined in these Operating Instructions,
➢ the valve is used only in such a way that the technical
data, ambient and operating conditions indicated in
these Operating Instructions are complied with, and in
particular that the limiting values given in the Technical
Data Sheet are not exceeded as far as anyone can
judge and that they are in compliance with his Operating
Instructions,
➢ the applicable regulations, codes and standards on
explosion protection are complied with.
1 Scope of delivery
The scope of delivery of the valve is given in the Technical
Data Sheet for this valve (Part I of these Operating
Instructions).
2 Using this manual
Cross-references are printed in italics.
DANGER
This symbol indicates a threat of danger which will result
directly in death or very serious injury if not avoided.
WARNING
This symbol indicates a threat of danger which may result in
death or very serious injury if not avoided.
CAUTION
This symbol indicates possible danger which may lead to
minor or serious injury and/or to material damage.
IMPORTANT
This symbol indicates additional information.

4WS2EM...VH1...-100 | RA 29583-VH1-100-B24/16 Bosch Rexroth AG | Hydraulics
The valve is only to be used with the pressure fluids given
in the
Technical Data Sheet . Information on using products
with different pressure fluids is available on request.
Use the valve only if it is in perfect technical condition and
only in accordance with the proper use as defined in these
Operating Instructions.
IMPORTANT
If you wish to use the product with connections, operating
conditions and performance data other than those defined
by Bosch Rexroth AG in this userˈs manual then you should
contact Bosch Rexroth AG in advance. The product must
not be used with connections, operating conditions and
performance data other than those defined in these
Operating Instructions without the written agreement of
Bosch Rexroth AG.
3.3 Requirements for personnel, duty to
take good care
3.3.1 General requirements, qualifications
Persons under the age of 18 who are currently receiving
instruction or training or are working under supervision may
not work on Rexroth hydraulic products.
This does not apply to young persons over the age of 16 if
➢ working on Rexroth hydraulic products is necessary in
order for them to accomplish their training objective,
➢ their protection is guaranteed by the supervision of an
experienced, specialist member of staff,
➢ they are only allowed to use tools, work implements and
protective gear that preclude the risk of injury.
Specialist personnel are those who, using their specialist
training, knowledge and experience as well as familiarity
with the relevant conditions, can recognise possible dangers
and undertake the necessary measures to eliminate
possible accidents.
3.3.2 Requirements for personnel carrying out
area classification and equipment selection
Article 505 of the NEC ® demands that area classification
and equipment selection shall be under the supervision of a
Qualified Registered Professional Engineer.
3.3.3 Requirements for maintenance personnel
It may be necessary to carry out maintenance tasks on
the valve in order to keep it in proper working order.
Maintenance tasks include inspection, servicing and
maintenance of hydraulic and electrical components.
The personnel carrying out these various tasks must have
certain minimum qualifications.
For inspections of the hydraulic components the personnel
must fulfil the following requirements:
➢ they must be instructed about the tasks,
➢ specialist knowledge of hydraulics is not required.
For maintenance of the hydraulic parts the personnel must
fulfil the following requirements:
➢ the personnel must be hydraulics experts instructed in
the tasks as defined above,
➢ the personnel must be familiar with the function of the
hydraulic system as a whole, from subsystems to their
interaction with the function of the machine as a whole,
➢ the personnel must be able to read hydraulic circuit
diagrams, interpret individual functions from their
symbols and understand function diagrams,
➢ the personnel must possess knowledge of the function
and construction of hydraulic elements.
For work on the electric parts, the following applies:
Article 505 of the NEC ® demands that wiring shall be under
the supervision of a Qualified Registered Professional
Engineer.
All work on electrical equipment may only be carried out by
an authorised, qualified electrician, or by instructed persons
under the guidance and supervision of an authorised
qualified electrician, in accordance with the rules applicable
to electrotechnical products.
3.4 Proper valve storage
Store the valve only in a dry, dust-free atmosphere that is
free of corrosive agents and vapours, has a low moisture
content and no large variations in temperature. We
recommend the use of clean conservation oil for storage
periods longer than six months.
IMPORTANT
The factory-applied corrosion protection is adequate for
storage under the conditions given above, provided that no
condensation or leaked water can penetrate the valve.
3.5 Proper valve disposal
Empty valve and dispose of it as scrap metal.
Collect residual oil and dispose of it in accordance with the
instructions in the safety data sheet for the hydraulic fluid.