RDHALAN – Sun Hydraulics Direct-acting relief valve, Standard Material/Coating
Part number: RDHALAN · RDHA-LAN · RDHA LAN
Direct-acting relief valve. Cavity T-16A, capacity 100 gpm (380 L/min.). Genuine Sun Hydraulics cartridge — MultiFlow is an authorized distributor.
RDHA-LAN overview
RDHALAN (RDHA-LAN, RDHA LAN) is a Sun Hydraulics Sun Hydraulics Direct-acting relief valve, rated 100 gpm (380 L/min.) and installed in cavity T-16A. 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.
| RDHALAN/AP | Stainless Steel, PassivatedStainless Steel, Passivated |
|---|---|
| RDHALAN/LH | Mild Steel, Zinc-NickelMild Steel, Zinc-Nickel |
| RDHALAN | Standard Material/CoatingStandard Material/Coating |
Specifications
| Cavity | T-16A |
|---|---|
| Series | 3 |
| Capacity | 100 gpm (380 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 |
| Adjustment - No. of CW Turns from Min. to Max. setting | 6 |
| Valve Hex Size | 1 1/4 in. (31,8 mm) |
| Valve Installation Torque | 150 - 160 lbf ft (203 - 217 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 | 1.30 lb (0,60 kg) |
| Seal kit - Cartridge | Viton: 990316006 |
U.S. Patent #4,742,846; European Patent Pending
How to read RDHALAN
Sun part numbers are the model followed by one code per option. Hyphens, slashes and spaces are only dividers, so RDHALAN, RDHA-LAN, RDHA LAN are the same part.
| Model | RDHA — Sun Hydraulics Direct-acting relief valve |
|---|---|
| Control | L — Standard Screw Adjustment |
| Adjustment Range | A — 500 - 3000 psi (35 - 210 bar), 1000 psi (70 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
- L — Standard Screw Adjustment
- C — Tamper Resistant - Factory Set
- Q — Capped and Lockwired
Adjustment Range options
- A — 500 - 3000 psi (35 - 210 bar), 1000 psi (70 bar) Standard Setting
- W — 800 - 4500 psi (55 - 315 bar), 1000 psi (70 bar) Standard Setting
- B — 300 - 1500 psi (20 - 105 bar), 1000 psi (70 bar) Standard Setting
- C — 1000 - 6000 psi (70 - 420 bar), 1000 psi (70 bar) Standard Setting
- D — 200 - 800 psi (14 - 55 bar), 400 psi (28 bar) Standard Setting
- E — 100 - 400 psi (7 - 28 bar), 200 psi (14 bar) Standard Setting
- S — 50 - 200 psi (3,5 - 14 bar), 100 psi (7 bar) Standard Setting
Seal Material options
- N — Buna-N
- L — Extended Temp. Buna
- V — Viton
- E — EPDM
Material/coating options
- /AP — Stainless Steel, Passivated
- /LH — Mild Steel, Zinc-Nickel
- — Standard Material/Coating
Manifold & standard assemblies
Sun manifolds for cavity T-16A (161)
- CD4 Sun Hydraulics ISO 08: On A with reverse flow check Sandwich manifoldRDHALAN-CD4 — request assembly
- CDC Sun Hydraulics ISO 08: A to T Sandwich manifoldRDHALAN-CDC — request assembly
- CDD Sun Hydraulics ISO 08: B to T Sandwich manifoldRDHALAN-CDD — request assembly
- CDO Sun Hydraulics ISO 08: P to T Sandwich manifoldRDHALAN-CDO — request assembly
- CDV Sun Hydraulics ISO 08: T to A and B Sandwich manifoldRDHALAN-CDV — request assembly
- CDW Sun Hydraulics ISO 08: A to B and B to A Sandwich manifoldRDHALAN-CDW — request assembly
- CDZ Sun Hydraulics ISO 08: A and B to T Sandwich manifoldRDHALAN-CDZ — request assembly
- CK4 Sun Hydraulics ISO 07: On A with reverse flow check Sandwich manifoldRDHALAN-CK4 — request assembly
- CKD Sun Hydraulics ISO 07: A to T with gage port Sandwich manifoldRDHALAN-CKD — request assembly
- IA4 Sun Hydraulics Ninety degree with gauge port Line mount manifoldRDHALAN-IA4 — request assembly
- IA5 Sun Hydraulics Ninety degree with gauge port Line mount manifoldRDHALAN-IA5 — request assembly
- IA6 Sun Hydraulics Ninety degree with gauge port Line mount manifoldRDHALAN-IA6 — 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.
- 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.
- 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.
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 RDHALAN the same as RDHA-LAN?
Yes. Sun Hydraulics writes this part number as RDHALAN. It is the model RDHA followed by the configuration code; hyphens, slashes and spaces are only dividers, so RDHALAN, RDHA-LAN, RDHA LAN all refer to the same product.
Do you supply RDHALAN in the UAE, GCC and India?
Yes. MultiFlow supplies genuine Sun Hydraulics cartridges, including RDHALAN, 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?
Manufacturer reference: https://www.sunhydraulics.com/model/RDHA
