Sun Hydraulics Relief Valve - Direct-acting - RDFALAN

Features
 • Direct-acting relief cartridges are normally closed, pressure-limiting valves used to protect hydraulic components from pressure transients
 • When the pressure at the inlet (port 1) reaches the valve setting, the valve starts to open to tank (port 2), throttling flow to limit the pressure rise
 • These valves are smooth and quiet, essentially zero leak, dirt tolerant, immune to silting and are very fast
 • All 2-port relief cartridges (except pilot reliefs) are physically and functionally interchangeable (same flow path, same cavity for a given frame size)
 • Will accept maximum pressure at port 2; suitable for use in cross port relief circuits
 • The seals on the adjust screw are exposed to system pressure which means this valve can only be adjusted when the pressure is removed
 • The setting procedure is; check the setting, remove the pressure, adjust the valve, check the new setting
 • 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
 • Suitable for use in load holding applications
 • Back pressure on the tank port (port 2) is directly additive to the valve setting at a 1:1 ratio
 • Cartridges configured with EPDM seals are for use in systems with phosphate ester fluids
 • Exposure to petroleum based fluids, greases and lubricants will damage the seals
 • Test pressure for each range is as follows: A range - 2000 psi (138 bar), B range - 1000 psi (69 bar), C range - 4000 psi (276 bar), D range - 800 psi (55 bar), E range - 400 psi (28 bar), S range - 150 psi (10 bar), W range - 3000 psi (207 bar)
 • Reseat meets or exceeds 90% of crack pressure at test setting
 • Settings lower than the test pressure may result in lower reseat percentages
 • 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

Specifications

 • Cavity :- T-3A
 • Series :- 2
 • Capacity :- 50 gpm200 L/min.
 • Factory Pressure Settings Established at :- 4 gpm15 L/min.
 • Maximum Operating Pressure :- 5000 psi350 bar
 • Maximum Valve Leakage at Reseat :- 10 drops/min.0,7 cc/min.
 • Response Time - Typical :- 2 ms2 ms
 • Reseat :- >90% of setting>90% of setting
 • Adjustment - No. of CW Turns from Min. to Max. setting :- 66
 • Valve Hex Size :- 1 1/8 in.28,6 mm
 • Valve Installation Torque :- 45 - 50 lbf ft61 - 68 Nm
 • Adjustment Screw Internal Hex Size :- 5/32 in.4 mm
 • Locknut Hex Size :- 9/16 in.15 mm
 • Locknut Torque :- 80 - 90 lbf in.9 - 10 Nm
 • Model Weight :- 0.66 lb.0.30 kg.
 • Seal kit - Cartridge :- Buna: 990303007
 • Seal kit - Cartridge :- EPDM: 990303014
 • Seal kit - Cartridge :- Polyurethane: 990303002
 • Seal kit - Cartridge :- Viton: 990303006

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