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Relief valve from Sun Hydraulics

Description

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.

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  • 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.

Technical Data

Note: Data may vary by configuration. See CONFIGURATION section.

Cavity T-3A
Series 2
Capacity 30 gpm
Capacity (metric) 120 L/min.
Maximum Operating Pressure 5000 psi
Maximum Operating Pressure (metric) 350 bar
Factory Pressure Settings Established at 4 gpm
Factory Pressure Settings Established at (metric) 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 1 1/8 in.
Valve Hex Size (metric) 28,6 mm
Valve Installation Torque 45 – 50 lbf ft
Valve Installation Torque (metric) 61 – 68 Nm
Seal kit – Cartridge Viton: 990303006
Model Weight 0.72 lb.
Model Weight (metric) 0.33 kg.

Configuration Options

Control

C Tamper Resistant – Factory Set
L Standard Screw Adjustment

Adjustment Range

C 1500 – 6000 psi (105 – 420 bar), 1500 psi (105 bar) Standard Setting
W 800 – 4500 psi (55 – 315 bar), 1000 psi (70 bar) Standard Setting

Seal Material

N Buna-N
V Viton
Cavity: T-3A
Nominal Capacity: 50 gpm (200 lpm )
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Possible variants

RBFACCN, RBFA-CCN, RBFACCV, RBFA-CCV, RBFACWN, RBFA-CWN, RBFACWV, RBFA-CWV, RBFALCN, RBFA-LCN, RBFALCV, RBFA-LCV, RBFALWN, RBFA-LWN, RBFALWV, RBFA-LWV

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