SOBD5A-S4/I
1-5/16-12 UNF • Q
max
180 l/min (48 GPM) • p
max
350 bar (5100 PSI)
1
2
3
4
1
3
24
1
2
0 30 90 150 210 270
5
15
10
(73)
(435)
(363)
(290)
(145)
25
20
30
40
(218)
(508)
(7.9) (23.8) (39.6) (55.5) (71.3)
35
(580)
Subject to change · SOBD5A-S4/I_5212_1en_02/2016
www.argo-hytos.com
Page 1
Overcentre Valve, Fully Balanced, Internal Drain
Technical Features
Functional Description
Characteristics measured at ν = 40 mm
2
/s (195 SUS)
› The valve prevents runaway ahead of the pump in the event of a negative load
› Load-holding with leak-free closing poppet when directional valve is in neutral position
› Pressure relief function protecting the actuator against overload and pressure peaks
› Integrated check valve acting as an anti-cavitation valve
› When installed into an actuator the valve can be used as a hose burst valve
› Back pressure neither affects the relief setting nor the required pilot pressure
› In the standard version, the valve is zinc-coated for 240 h protection acc. to ISO 9227
Poppet type, screw-in motion control valve designed to control the runaway of a negative load. The built-in
check valve allows reverse ow into the actuator, which is protected by the internal pressure relief function.
Back pressure at port 2 does neither affect the pressure relief setting nor the required pilot pressure. The spring
chamber is drained to port 4.
Pressure drop ∆p [bar (PSI)]
Flow Q [l/min (GPM)]
Pressure drop related to flow rate
Pilot ratio 8:1
Flow
1 free ow (2→1)
2 pilot open (1→2)
Symbol
Technical Data
Valve size / Cartridge cavity 1-5/16-12 UNF-2A / S4
Max. ow l/min (GPM) 180 (47.6)
Max. load induced pressure bar (PSI) 270 (3920)
Max. relief pressure bar (PSI) 350 (5080)
Fluid temperature range °C (°F) -20 .... +90 (-4 ... +194)
Pilot ratio 8:1
Internal Leckage mil/min 0.3 nominal (5 drops per min)
Max. degree of uid contamination ISO 4406 Class 21/18/13
Mass kg (Ibs) 0.56 (1.23)
Datasheet Type
General information GI_0060 Products and operating conditions
Valve bodies In-line mounted SB_0018 SB-S4*
Cavity details SMT_0019 SMT-S4*
Spare parts SP_8010
1-5/16-12 UN-2A
4
17
38
100+2 Nm
(74+1.5 Ibf.ft)
63 (2.48) MAX
59,5 (2.34)
Subject to change · SOBD5A-S4/I_5212_1en_02/2016
www.argo-hytos.com
Page 2
Dimensions in millimeters (inches)
Ordering Code
88:1
Overcentre valve, fully balanced,
internal drain 1-5/16-12 UNF
Pilot ratio
standard
A
35
SOBD5A-S4 / l - - -
Seals
NBR
FPM (Viton)
Surface treatment
zinc-coated (ZnCr-3), ISO 9227 (240 h)
Factory setting [bar @ l/min]
210 bar at 4.8 l/min
210/4,8
Relief pressure range
70 - 350 bar (1015 - 5080 PSI)
No designation
V
