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2024 Sun Hydraulics 1 of 2
MODEL
RBFARBFA
Bi-directional direct-acting relief valve
SERIESSERIES 2 / 2 / CAPACITY:CAPACITY: 120 L/min. / 120 L/min. / CAVITY:CAVITY: T-3A T-3A
(L)(L)CONTROLCONTROL
LL Standard Screw Adjustment
CC Tamper Resistant - Factory Set
(W)(W)ADJUSTMENT RANGEADJUSTMENT RANGE
WW 800 - 4500 psi (55 - 315 bar),
1000 psi (70 bar) Standard
Setting
CC 1500 - 6000 psi (105 - 420 bar),
1500 psi (105 bar) Standard
Setting
(N)(N)SEAL MATERIALSEAL MATERIAL
NN Buna-N
VV Viton
NOTE: DATA MAY VARY BY CONFIGURATION. SEE CONFIGURATION SECTION.
The bi-directional, direct-acting relief cartridge is a normally closed, pressure-limiting valve
used to protect hydraulic components from pressure transients. When the pressure
differential between ports 1 and 2 exceeds the valve setting, the valve starts to open,
throttling flow to limit the pressure rise, regardless of the direction.
Both directions have very similar setting and performance.
TECHNICAL DATATECHNICAL DATA
Cavity T-3A
Series 2
Capacity 120 L/min.
Maximum Operating Pressure 350 bar
Factory Pressure Settings Established at 15 L/min.
Maximum Valve Leakage at Reseat 30 drops/min.
Response Time - Typical 2 ms
Reseat >85% of setting
Hysteresis ≤ 3 %
Adjustment - No. of CW Turns from Min. to Max. setting 5
Valve Hex Size 28,6 mm
Valve Installation Torque 61 - 68 Nm
Seal kit - Cartridge Buna: 990303007
Seal kit - Cartridge Polyurethane: 990303002
Seal kit - Cartridge Viton: 990303006
Model Weight 0.31 kg.
sunhydraulics.com/model/
RBFA
Model Code Example: RBFALWNModel Code Example: RBFALWNCONFIGURATION OPTIONSCONFIGURATION OPTIONS
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2024 Sun Hydraulics 2 of 2
TECHNICAL FEATURESTECHNICAL FEATURES
Because the modulating occurs inside the cartridge, these valves are immune to most of the problems associated with cavitation,
namely noise and manifold erosion.
The seals on the adjust screw are exposed to pressure at port 1 which means this valve can only be adjusted when the pressure is
removed or port 2 is used to set the valve. The setting procedure at port 1 is; check the setting, remove the pressure, adjust the
valve, check the new setting.
All 2-port relief cartridges (except pilot reliefs) are physically and functionally interchangeable (same flow path, same cavity for a
given frame size).
Valve is relatively insensitive to varying oil temperatures and oil borne contamination.
Select a spring range where the desired relief setting is approximately mid-range to high between the minimum and maximum
pressure to ensure maximum valve repeatability.
Incorporates the Sun floating style construction to minimize the possibility of internal parts binding due to excessive installation
torque and/or cavity/cartridge machining variations.
PERFORMANCE CURVESPERFORMANCE CURVES
