RDFA3-AN – Sun Hydraulics Non-adjustable direct-acting relief valve
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Part number: RDFA3AN · RDFA3-AN · RDFA3 AN
Non-adjustable direct-acting relief valve. Cavity T-3A, capacity 50 gpm (200 L/min.). Genuine Sun Hydraulics cartridge — MultiFlow is an authorized distributor.
RDFA3-AN overview
RDFA3AN (RDFA3-AN, RDFA3 AN) is a Sun Hydraulics Sun Hydraulics Non-adjustable direct-acting relief valve, rated 50 gpm (200 L/min.) and installed in cavity T-3A. MultiFlow supplies genuine Sun Hydraulics cartridges in the UAE, GCC and India — use Add to Enquiry above for availability and a quotation.
Ordering codes
Pick the code that matches the material and finish you need. Add it to your enquiry above, or tap a code to select it.
| RDFA3AN | Buna-N sealsBuna-N |
|---|---|
| RDFA3AV | Viton sealsViton |
Specifications
| Cavity | T-3A |
|---|---|
| Series | 2 |
| Capacity | 50 gpm (200 L/min.) |
| Maximum Operating Pressure | 5000 psi (350 bar) |
| Factory Pressure Settings Established at | 4 gpm (15 L/min.) |
| Maximum Valve Leakage at Reseat | 10 drops/min. (0,7 cc/min.) |
| Response Time - Typical | 2 ms |
| Reseat | >90% of setting |
| Valve Hex Size | 1 1/8 in. (28,6 mm) |
| Valve Installation Torque | 45 - 50 lbf ft (61 - 68 Nm) |
| Model Weight | .50 lb (0,25 kg) |
| Seal kit - Cartridge | Viton: 990303006 |
How to read RDFA3AN
Sun part numbers are the model followed by one code per option. Hyphens, slashes and spaces are only dividers, so RDFA3AN, RDFA3-AN, RDFA3 AN are the same part.
| Model | RDFA3 — Sun Hydraulics Non-adjustable direct-acting relief valve |
|---|---|
| Adjustment Range | A — 500 - 3000 psi (35 - 210 bar) |
| Seal Material | N — Buna-N |
| Material / coating | Add /AP (stainless steel, passivated) or /LH (mild steel, zinc-nickel) to the end; no suffix is the standard finish. |
Adjustment Range options
- A — 500 - 3000 psi (35 - 210 bar)
- C — 1000 - 6000 psi (70 - 420 bar)
- D — 200 - 800 psi (14 - 55 bar)
Seal Material options
- N — Buna-N
- V — Viton
Manifold & standard assemblies
Sun manifolds for cavity T-3A (238)
- CA3 Sun Hydraulics Ninety degree with gauge port Line mount manifoldRDFA3AN-CA3 — request assembly
- CA4 Sun Hydraulics Ninety degree with gauge port Line mount manifoldRDFA3AN-CA4 — request assembly
- CA5 Sun Hydraulics Ninety degree with gauge port Line mount manifoldRDFA3AN-CA5 — request assembly
- CAA Sun Hydraulics Ninety degree Line mount manifoldRDFA3AN-CAA — request assembly
- CAB Sun Hydraulics Ninety degree Line mount manifoldRDFA3AN-CAB — request assembly
- CAC Sun Hydraulics Ninety degree Line mount manifoldRDFA3AN-CAC — request assembly
- CAD Sun Hydraulics Ninety degree Line mount manifoldRDFA3AN-CAD — request assembly
- CAE Sun Hydraulics Ninety degree with gauge port Line mount manifoldRDFA3AN-CAE — request assembly
- CAH Sun Hydraulics Ninety degree Line mount manifoldRDFA3AN-CAH — request assembly
- CAI Sun Hydraulics Ninety degree Line mount manifoldRDFA3AN-CAI — request assembly
- CAJ Sun Hydraulics Ninety degree Line mount manifoldRDFA3AN-CAJ — request assembly
- CAK Sun Hydraulics Ninety degree Line mount manifoldRDFA3AN-CAK — request assembly
Technical features
- Customer must specfy setting. The valve will be factory set and is tamper proof.
- 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.
- Will accept maximum pressure at port 2; suitable for use in cross port relief circuits.
- 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.
- All 2-port relief cartridges (except pilot reliefs) are physically and functionally interchangeable (same flow path, same cavity for a given frame size).
- 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.
Drawings, symbol & performance curves
Downloads
Datasheet
Technical reference sheets
- 999-901-334 (PDF 344 KB)
- FloatingStyleScrewInCartridge2 (PDF 1 MB)
- TT_US_Cavity-New (PDF 522 KB)
- TT_US_Relief-N (PDF 656 KB)
CAD files
Frequently asked questions
Is RDFA3AN the same as RDFA3-AN?
Yes. Sun Hydraulics writes this part number as RDFA3AN. It is the model RDFA3 followed by the configuration code; hyphens, slashes and spaces are only dividers, so RDFA3AN, RDFA3-AN, RDFA3 AN all refer to the same product.
Do you supply RDFA3AN in the UAE, GCC and India?
Yes. MultiFlow supplies genuine Sun Hydraulics cartridges, including RDFA3AN, to customers in the UAE, the wider GCC and India. Use Add to Enquiry on this page for availability, lead time and a quotation.
Can I get the datasheet and CAD files?
Yes. The datasheet, technical reference sheets and CAD files (DXF, DWG, STP) are listed in the Downloads section of this page.
Can I use a kick-down relief for my system relief?
Maybe not. We build in a good amount of overlap in the kick-down reliefs to prevent false tripping. This means they are not as fast as our standard pilot-operated reliefs. A direct-acting relief valve set just above the kick-down relief valve would be good insurance.
Direct acting or pilot operated - what do I use?
Direct-acting valves are used to prevent over pressure, and pilot-operated valves are used to regulate pressure. If you are unsure, use a direct-acting valve. Sun's direct acting valves are very fast, dirt tolerant, stable, and robust. Sun's pilot-operated valves are moderately fast, they have a low pressure rise vs. flow curve, and they are easy to adjust.
Where would I use a kick-down relief?
One graphic example is on a portable grain auger for silos. When the farmer gets caught in the auger the kick-down relief trips and allows him to escape.
What are the tolerances on pressure settings for Sun's pressure control valves?
Pressure setting tolerances are listed in our Performance Data page. A link to this page can also be found in the Additional Resources tab of the applicable product page.
How big is a drop of hydraulic oil?
There are exactly 250 Sun drops in a cubic inch or 15 in a cc.
What parts of the Sun cartridge valve are field serviceable?
Only external seals are serviceable. Sun offers replacement seal kits for all cartridge models. The applicable kit part number can be found in the product page's Technical Data table or by using our Cartridge Seal Kit search function located under Accessories. Please note: Converting the external seals from one material to another does not ensure fluid compatibility with that material due to the existence of internal seals within the cartridge.
Manufacturer reference: https://www.sunhydraulics.com/model/RDFA3
