Features
Standard & high response versions
Maximum operating pressure 315 bar
ISO 10372-04-04-0-92 mounting pattern
Field configurable pilot supply (4 or 5 port)
Suitable for 3-way or 4-way applications
Low hysteresis & zero point drift
High spool drive forces
Spool in bushing design
Dry torque motor with mechanical feedback
Long life Sapphire Technology
Star Hydraulics Limited
Severn Drive
Tewkesbury Business Park
Tewkesbury
Gloucestershire
GL20 8SF
England (UK)
www.star-hydraulics.co.uk
ST-558-2016.1-En
558
2-Stage Servovalve
Rated flows up to 75 l/m
series
STAR
Benefits and Features
Sapphire ball in slot design
• Incorporated into Star designs since 1988
• Many billions of cycles per service life
• Increased spool life due to spool rotation
• Ultra low coefficient of friction sapphire to steel
• Feedback mechanism unhindered by spool rotation
• Extended warranties available
Special connectors
• MIL-C-5015
• MIL-DTL-38999
• Conduit style male/female
• Hermetic
Safety
• Flame proof
• Intrinsic safety
• Class, Div & Zone coverage
• Mechanical failsafe
• Double & triple coil redundancy
Sealing materials
• Nitrile
• Fluorocarbon (Viton)
• Ethylene-Propylene
• Fluorosilicone
Special projects
• Compact servo designs
• Special interfaces
• Modular components
Custom spool lap & bushing port geometries
• Zero overlap
• Overlap (closed center)
• underlap (open center)
• Dual gain
• Asymmetric gain
Quality
• Independant audit process is our commitment on quality
• Focus on customer needs and expectations
• Delivery schedules on time
• Continual improvements on products and services
• Maintaining design and manufacturing integrity
Sapphire flow
• Ensuring first stage stability
• Precisely matched flow properties
• Long life in extreme environments
Hydraulic
Nominal flow ratings [±10%]
at 70 bar Dp
standard response 2, 4, 10, 20, 40, 60, 75 l/m
high response 4, 10, 20, 40 l/m
Operating pressure (max) Ports P, C1, C2, X R
Seal material NBR, FPM 315 bar 315 bar
EPDM 280 bar 210 bar
Fluid viscosity range (recommended)
10 to 100 mm
2
/s (cSt)
Fluid type Mineral oil to ISO 11158, DIN 51524 or equivalent
MIL-H-5606
Skydrol
Kerosene
Water glycols
others on request
Filter rating (recommended) Pressure line
Beta 10 = 200 (10 µm abs), non by-pass & indicator
Off-line
Beta 2 = 1000 (2 µm abs)
Fluid cleanliness ISO 4406: 1999
minimum 16/ 14/ 11
recommended 15/ 13/ 10
Operational parameters
Hysteresis
≤ 3.0% without dither
Threshold
≤ 0.5% without dither
Null shift
∆T 40°C ≤ 2.0%
Internal leakage 140 bar supply (0.5% overlap)
2, 4, 10 l/m
≤ 1.2 l/m
20, 40, 60, 75 l/m
≤ 1.6 l/m
Load pressure difference 1% input
≥ 30% of supply pressure can be as high as 100%
Response time 0-100% rated spool stroke
standard response 2, 4, 10, 20, 40 l/m 8 ms
60 l/m 13 ms
75 l/m 15 ms
high response 4, 10, 20 l/m 4.5 ms
40 l/m 6 ms
Mounting pattern ISO 10372-04-04-0-92 with X port (field configurable)
Mounting position Any, fixed or movable
Weight std unit 1.1 kg
Design protection EN 60529 IP 65
Shipping protection Sealed base plate
Vibration 30 g all axis, 5 Hz to 2,000 Hz
Shock 30 g all axis
Seal material options NBR, FPM, EPDM
Temperature range -30 to 135 °C
Technical data
Electrical
Rated input ± (mA) single (differential) 8 15 30 40 100 200
Other coil rates available series 4 7.5 15 20 50 100
parallel 8 15 30 40 100 200
Coil resistance (W)
per coil 1000 200 300 80 28 22
Power (W) single 0.064 0.045 0.27 0.128 0.280 0.88
series 0.032 0.023 0.135 0.064 0.140 0.440
parallel 0.032 0.023 0.135 0.064 0.140 0.440
Connector pin out identification A
B
C
D
Polarity P»C2, C1»R single A +, B - or C +, D -
series A +, D -, B & C linked
parallel A & C linked +, B & D linked -
Valve connector type MIL-C-5015 MS3102E-14S-2P mates with MS3106F-14S-2S
Consult factory for more options
Standard connector orientation P port
also available over C1, C2 or R port; please advise when ordering
Technical data
70
P»C2, C1»R
P»C1, C2»R
0
1
2
3
4
5
-100 -80 -60 -40 -20 0 20 40 60 80 100
Internal leakage (l/m)
% Rated input signal
Internal Leakage v Input Signal
The flow tolerance for standard servovalves is ±10% of the
rated flow at 100% rated input signal.
Rated Signal [In] is the specified input voltage or current of
either polarity to produce rated flow. Rated input does not
include null bias values.
Rated flow corresponds to the flow at rated input at 10 bar or
70 bar, with no load, therefore in 4-way valves there will be a
pressure drop of 5 bar or 35 bar respectively across each
land.
Load pressure difference versus input signal indicates typical
differential pressure gain between ports C1 (A) and C2 (B) for
standard lap spools. Negative and positive overlap change
this characteristic signifcantly.
Internal leakage comprises of tare first stage and laminar
leakage between spool and sleeve. With critical lap conditions
in 4-way designs the leakage peaks through the null region.
Technical data
.
-360
-270
-180
-90
0-21
-18
-15
-12
-9
-6
-3
0
3
1 10 100
Phase Lag (deg)
Amplitude Ratio (dB)
Frequency (Hz)
Std response Qn 2, 4, 10, 20, 40 l/m at 100% In, 210 bar
Technical data
-360
-270
-180
-90
0-21
-18
-15
-12
-9
-6
-3
0
3
1 10 100
Phase Lag (deg)
Amplitude Ratio (dB)
Frequency (Hz)
Std response Qn 60 l/m at 100% In, 210 bar
-360
-270
-180
-90
0-21
-18
-15
-12
-9
-6
-3
0
3
1 10 100
Phase Lag (deg)
Amplitude Ratio (dB)
Frequency (Hz)
Std response Qn 75 l/m at 25% In, 210 bar
.
-360
-270
-180
-90
0-21
-18
-15
-12
-9
-6
-3
0
3
1 10 100
Phase Lag (deg)
Amplitude Ratio (dB)
Frequency (Hz)
High response Qn 4, 10, 20 l/m at 100% In, 210 bar
Technical data
-360
-270
-180
-90
0-21
-18
-15
-12
-9
-6
-3
0
3
1 10 100
Phase Lag (deg)
Amplitude Ratio (dB)
Frequency (Hz)
High response Qn 40 l/m at 100% In, 210 bar
-360
-270
-180
-90
0-21
-18
-15
-12
-9
-6
-3
0
3
1 10 100 1000
Phase Lag (deg)
Amplitude Ratio (dB)
Frequency (Hz)
Frequency Response Qn 75 l/m at 25% In
3
2.4
PIN A
PIN B
PIN C
PIN D
88.80
65
80
44.50
96
0
39
56.4
72
Mechanical
null adjust
82 min.
65 min.
0
0
F1
F2
F3
F4
C2
P
C1
X
R
G
558 series
INSTALLATION DETAILS
STAR
Mounting interface conforms to ISO 10372-04-04-0-92
P
C1 C2
R
X
F1 F2 F3 F4
G
size
9 9 9 9 3
M8 M8 M8 M8
3 5
x
22.25 11.14 33.35 22.25 33.35 0 44.50 44.50 0 12.35
y
21.39 32.50 32.50 43.61 8.70 0 0 65 65 19.80
Surface flat within 0.01 / 100 : finish better than 0.8 μm
Mounting screws
Skt head cap screws M8 x 50 - 10.9 ISO 4762
Null adjust (Mechanical)
- 2.5 hex skt & 10 A/F lock nut
- slacken lock nut (ccw) half-turn with 10 A/F ring spanner
- insert 2.5 hex key into socket and rotate to obtain required null / offset value
- hold hexagon key in desired position then tighten lock nut to 2 Nm
Porting details
P, C1, C2, R ports
9.0 14.25
1.40 on 22.2 P.C.D.
X port
3.0 14.25 1.40
Interface seals
Ports P, C1, C2, R, X - ID 10.82 x
1.78 O-Ring
2
3
3X
4
3
2X
5
6
7
1
3X
VIEW OF VALVE BASE
Indicator
plate tab
Port 'X'
558 series
INSTALLATION DETAILS
STAR
INTERNAL / EXTERNAL PILOT MODE
External pilot port 'X' can be activated as follows:-
- Remove M5 cap screws (1).
- Remove cover plate (2).
- Remove indicator plate (4).
- Flip indicator plate with tab next to #5 (as shown right).
- Reinstall parts in reverse order.
- Torque M5 screws to 4 Nm.
FILTER ASSEMBLY REPLACEMENT
- Remove M5 cap screws (1).
- Remove cover plate (2).
- Remove indicator plate (4).
- Remove & discard filter (6)
- Install new filter & seals (ensure appropriate material and
shore hardness are used).
- Reinstall parts in reverse order.
- Torque M5 screws to 4 Nm.
W
WARNING do not attempt any
changes whilst the valve is pressurized!
Item
Description
Part Number / Size
1
Socket low head cap screws
M5 x 12
2
Cover plate
SRS2390
3
O Ring
200-006-xxxx
4
Indicator plate
SRS2391
5
O Ring
200-016-xxxx
6
Filter assembly
SRS2392
7
O Ring
200-014-xxxx