RDFA3AN – Sun Hydraulics Non-adjustable direct-acting relief valve, Buna-N seals

RDFA3-AN Sun Hydraulics Relief Valve – installation dimensions drawing, cavity T-3A
RDFA3-AN Sun Hydraulics Relief Valve – hydraulic schematic symbol
RDFA3-AN Sun Hydraulics Relief Valve – performance curve (pressure drop vs flow)
RDFA3-AN Sun Hydraulics Relief Valve – performance curve (pressure drop vs flow)
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Part number: RDFA3AN · RDFA3-AN · RDFA3 AN

Brand Sun HydraulicsType Relief ValvesCapacity 50 gpm (200 L/min.)Cavity T-3A

Non-adjustable direct-acting relief valve. Cavity T-3A, capacity 50 gpm (200 L/min.). Genuine Sun Hydraulics cartridge — MultiFlow is an authorized distributor.

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SKU: RDFA3 Category: Brand:

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

CavityT-3A
Series2
Capacity50 gpm (200 L/min.)
Maximum Operating Pressure5000 psi (350 bar)
Factory Pressure Settings Established at4 gpm (15 L/min.)
Maximum Valve Leakage at Reseat10 drops/min. (0,7 cc/min.)
Response Time - Typical2 ms
Reseat>90% of setting
Valve Hex Size1 1/8 in. (28,6 mm)
Valve Installation Torque45 - 50 lbf ft (61 - 68 Nm)
Model Weight.50 lb (0,25 kg)
Seal kit - CartridgeViton: 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.

ModelRDFA3 — Sun Hydraulics Non-adjustable direct-acting relief valve
Adjustment RangeA — 500 - 3000 psi (35 - 210 bar)
Seal MaterialN — Buna-N
Material / coatingAdd /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)

View all 238 →

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

RDFA3-AN Sun Hydraulics Relief Valve – hydraulic schematic symbol
hydraulic schematic symbol
RDFA3-AN Sun Hydraulics Relief Valve – performance curve (pressure drop vs flow)
performance curve (pressure drop vs flow)
RDFA3-AN Sun Hydraulics Relief Valve – performance curve (pressure drop vs flow)
performance curve (pressure drop vs flow)

Downloads

Datasheet

Technical reference sheets

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

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