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208
Pressure Compensated
Flow Control Valve
Direct Acting
Cartridge – 350 bar
SRE 1 to 4
Up to 97 l/min
Up to 350 bar
The SRE is a pressure compensated ow
control valve which maintains a constant
outlet ow by means of a control function.
The ow rate is largely independent of the
pressure.
The valve has a xed orice with pressure
compensator spool. The measuring
orice determines the setting range for
the ow rate and can be adjusted over a
certain range. If oil is owing from 1 to 2,
a pressure drop occurs at the measuring
orice. The pressure compensator moves
into the control position which corresponds
to the force equilibrium. This is created
by the pressure dop acting on the control
piston area overcoming the spring force.
As the ow rate increases (greater
pressure drop), the diameter of the control
orice is reduced until the forces are equal
again. A constant ow rate is therefore
achieved. In the reverse direction there is
free ow through the valve. Caution: if the
required control pressure differential is not
reached, the valve operates as a non-
compensated ow control valve.
General
z For regulating the speed of loads independently of the pressure
z For limiting the max. speed of lifting gear (in compliance with accident prevention
regulations)
z For limiting the ow rate for control oil circuits in the main circuit or ofine
z All valve parts made of high-strength steel with hardened and ground components
to ensure minimal wear and extended service life
z Choice of four sizes for optimum adaptability to the system
z Space-saving installation
z Unauthorized adjustment not possible since not accessible once tted
Function
SPeciFicationS
Operating pressure: max. 350 bar
Nominal ow: SRE1 to max. 10 l/min
SRE2 to max. 20 l/min
SRE3 to max. 48 l/min
SRE4 to max. 97 l/min
Media operating temperature range: min. -20 °C to max. +100 °C
Ambient temperature range: min. -20 °C to max. +100 °C
Fluid: Hydraulic oil to DIN 51524 Part 1 + 2
Viscosity range: min. 2.8 mm²/s to max. 800 mm²/s
Filtration: Class 21/19/16 to ISO 4406
or cleaner
MTTF
d
: 150 years
Installation: No orientation restrictions, preferably
horizontal
Materials: Valve body: Steel
Cavity: 05520, 08520, 10520, 12520
Weight: SRE1= 0.013 kg SRE2= 0.025 kg
SRE3= 0.049 kg SRE4= 0.112 kg
E 5.118.6/12.10
209
MoDel coDe
SRE 1 – G 1/4 – 01 – X / – 2.3 – 2.8
Basic model
Pressure comp. ow control valve
Cartridge thread size
G 1/4 = SRE1
G 3/8 = SRE2
G 1/2 = SRE3
G 3/4 = SRE4
Type
01 = standard (phosphated)
Series
(determined by manufacturer)
Flow rate code
(see separate ow rate table)
Flow rate setting
no details = no setting
(but the ow rate is within the setting range)
2.8 = setting as per customer requirements
(tolerance ± 10 %)
Other settings on request
Flow rate and operating pressure ranges
Flow rate code
(VK)
Flow rate
setting range
(l/min)
Required control
pressure differential
Dp = p
1
– p
2
(bar)
0.6 0.6 – 0.7 10 - 12
SRE 1
1 1.0 – 1.3 10 - 12
1.6 1.6 – 2.1 10 - 12
2.3 2.3 – 3.0 10 - 12
3.8 3.8 – 4.8 10 - 15
6.6 6.6 – 8.6 10 - 15
1 1.0 – 1.5 8 - 15
SRE 2
1.5 1.5 – 2.4 8 - 15
2.9 2.9 – 4.6 8 - 15
5 5.0 – 7.5 10 - 15
9 9.0 – 13.0 12 - 18
15 15.0 – 23.0 12 - 18
1.7 1.7 – 2.1 8 - 12
SRE 3
2.8 2.8 – 3.8 8 - 12
4.5 4.5 – 5.5 8 - 15
7 7.0 – 9.2 8 - 15
10 10.0 – 12.5 8 - 15
15.5 15.0 – 18.0 8 - 15
26 25.5 – 30.0 8 - 15
35 35.0 – 42.0 10 - 18
27 27.0 – 29.4 12 - 15
SRE 4
40 40.0 – 42.9 12 - 15
46 46.0 – 49.9 12 - 15
55 55.0 – 59.9 13 - 17
70 70.0 – 78.9 15 - 18
88 88.0 – 97.0 18 - 21
- at a lower differential pressure the valve operates as a non-
compensated ow control valve
- different settings are available as an option
(standard manufacturer's setting at Dp = 100 bar)
Standard models
Model code Part No.
SRE1-G1/4-01X/1.6 717583
SRE1-G1/4-01X/3.8 710355
SRE1-G1/4-01X/6.6 710351
SRE2-G3/8-01X/2.9 717586
SRE2-G3/8-01X/9.0 717588
SRE2-G3/8-01X/15 717590
SRE3-G1/2-01X/7.0 717689
SRE3-G1/2-01X/15.5 717691
SRE3-G1/2-01X/26 717693
SRE4-G3/4-01X/70 717825
SRE4-G3/4-01X/88 479390
Other models on request
Standard line bodies
Code Part No. Material Ports Pressure
Port: 1x female thread, 1x male thread
XB05520-01X 393215 Steel G1/4 350 bar
XB08520-01X 393217 Steel G3/8 350 bar
XB10520-01X 393219 Steel G1/2 350 bar
XB12520-01X 395061 Steel G3/4 350 bar
Port: 2x female thread
XX05520-01X 393224 Steel G1/4 350 bar
XX08520-01X 393226 Steel G3/8 350 bar
XX10520-01X 393228 Steel G1/2 350 bar
XX12520-01X 395063 Steel G3/4 350 bar
Flow rate curveS
Q-Dp curve
Pressure differential Dp measured against ow rate Q,
measured at n = 72mm²/s
and T
oil
= 30°C
VK = Flow rate code
Dp
max
2 →: 250 bar
E 5.118.6/12.10
210
Torque value
SRE1 3 - 5 Nm
SRE2 5 - 8 Nm
SRE3 8 - 12 Nm
SRE4 12 - 18 Nm
DiMenSionScurveS
Flow rate, pressure-dependent
Q-Dp curve, measured at n = 72mm²/s
and T
oil
= 30°C
Size A øB øC D E F G H
SRE1 G 1/4 11.0 10.0 26.0 14.0 6.5 1.5 1.5
SRE2 G 3/8 14.0 13.0 30.0 14.5 9.5 1.5 1.5
SRE3 G 1/2 18.0 16.0 37.0 16.0 13.0 2.0 2.0
SRE4 G 3/4 23.0 20.0 51.0 21.0 20.0 4.0 2.0
E 5.118.6/12.10
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cavitY
05520
cavitY
10520
cavitY
08520
cavitY
12520
Form tools
Tool Part No. / Cavity
05520 08520 10520 12520
Tap 1002670 1002668 1002667 1002663
Assembly tool – – 160560 164108
HYDAC Fluidtechnik GmbH
Justus-von-Liebig-Str.
D-66280 Sulzbach/Saar
Tel: 0 68 97 /509-01
Fax: 0 68 97 /509-598
E-Mail: utec@hydac.com
NOTE
The information in this brochure relates to
the operating conditions and applications
described.
For applications or operating conditions
not described, please contact the relevant
technical department.
Subject to technical modications.
