RGFALCN – Sun Hydraulics Low-pressure-range, direct-acting relief valve, Standard Material/Coating
Part number: RGFALCN · RGFA-LCN · RGFA LCN
Low-pressure-range, direct-acting relief valve. Cavity T-3A, capacity 50 gpm (200 L/min.). Genuine Sun Hydraulics cartridge — MultiFlow is an authorized distributor.
RGFA-LCN overview
RGFALCN (RGFA-LCN, RGFA LCN) is a Sun Hydraulics Sun Hydraulics Low-pressure-range, 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.
| RGFALCN/AP | Stainless Steel, PassivatedStainless Steel, Passivated |
|---|---|
| RGFALCN | Standard Material/CoatingStandard Material/Coating |
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 110 SUS (24 cSt) | 3 in³/min.@1000 psi (50 cc/min.@70 bar) |
| Response Time - Typical | 10 ms |
| Adjustment - No. of CW Turns from Min. to Max. setting | 6 |
| Valve Hex Size | 1 1/8 in. (28,6 mm) |
| Valve Installation Torque | 45 - 50 lbf ft (61 - 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 | .55 lb (0,25 kg) |
| Seal kit - Cartridge | Viton: 990203006 |
For Series 1 cartridges configured with an O control (panel mount handknob), a .75 in. (19 mm) diameter hole is required in the panel.
How to read RGFALCN
Sun part numbers are the model followed by one code per option. Hyphens, slashes and spaces are only dividers, so RGFALCN, RGFA-LCN, RGFA LCN are the same part.
| Model | RGFA — Sun Hydraulics Low-pressure-range, direct-acting relief valve |
|---|---|
| Control | L — Standard Screw Adjustment |
| Adjustment Range | C — 18 - 50 psi (1,2 - 3,5 bar), 50 psi (3,5 bar) Standard Setting |
| 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. |
Control options
- C — Tamper Resistant - Factory Set
- K — Handknob
- L — Standard Screw Adjustment
- O — Handknob with Panel Mount
Adjustment Range options
- C — 18 - 50 psi (1,2 - 3,5 bar), 50 psi (3,5 bar) Standard Setting
- E — 20 - 75 psi (1,4 - 5 bar), 75 psi (5 bar) Standard Setting
- F — 35 - 80 psi (2,4 -5,5 bar), 80 psi (5,5 bar) Standard Setting
- G — 30 - 150 psi (2 - 10,5 bar), 150 psi (10,5 bar) Standard Setting
Seal Material options
- N — Buna-N
- V — Viton
- E — EPDM
Material/coating options
- /AP — Stainless Steel, Passivated
- — Standard Material/Coating
Manifold & standard assemblies
Sun manifolds for cavity T-3A (238)
- CA3 Sun Hydraulics Ninety degree with gauge port Line mount manifoldRGFALCN-CA3 — request assembly
- CA4 Sun Hydraulics Ninety degree with gauge port Line mount manifoldRGFALCN-CA4 — request assembly
- CA5 Sun Hydraulics Ninety degree with gauge port Line mount manifoldRGFALCN-CA5 — request assembly
- CAA Sun Hydraulics Ninety degree Line mount manifoldRGFALCN-CAA — request assembly
- CAB Sun Hydraulics Ninety degree Line mount manifoldRGFALCN-CAB — request assembly
- CAC Sun Hydraulics Ninety degree Line mount manifoldRGFALCN-CAC — request assembly
- CAD Sun Hydraulics Ninety degree Line mount manifoldRGFALCN-CAD — request assembly
- CAE Sun Hydraulics Ninety degree with gauge port Line mount manifoldRGFALCN-CAE — request assembly
- CAH Sun Hydraulics Ninety degree Line mount manifoldRGFALCN-CAH — request assembly
- CAI Sun Hydraulics Ninety degree Line mount manifoldRGFALCN-CAI — request assembly
- CAJ Sun Hydraulics Ninety degree Line mount manifoldRGFALCN-CAJ — request assembly
- CAK Sun Hydraulics Ninety degree Line mount manifoldRGFALCN-CAK — request assembly
Technical features
- 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. If used in cross port relief circuits, consider spool leakage.
- Not suitable for use in load holding applications due to spool leakage.
- Back pressure on the tank port (port 2) is directly additive to the valve setting at a 1:1 ratio.
- Corrosion resistant cartridge valves are intended for use in corrosive environments and are identified by the model code suffix /AP for external stainless steel components, or /LH for external zinc-nickel plated components. See the CONFIGURATION section for all options. For further details, please see the Materials of Construction page located under TECH RESOURCES.
- 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 RGFALCN the same as RGFA-LCN?
Yes. Sun Hydraulics writes this part number as RGFALCN. It is the model RGFA followed by the configuration code; hyphens, slashes and spaces are only dividers, so RGFALCN, RGFA-LCN, RGFA LCN all refer to the same product.
Do you supply RGFALCN in the UAE, GCC and India?
Yes. MultiFlow supplies genuine Sun Hydraulics cartridges, including RGFALCN, 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.
How big is a drop of hydraulic oil?
There are exactly 250 Sun drops in a cubic inch or 15 in a cc.
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.
What parts of the Sun cartridge valve are field serviceable?
Manufacturer reference: https://www.sunhydraulics.com/model/RGFA
