RBUY-LAN – Sun Hydraulics Bi-directional, direct-acting relief valve – common cavity
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Part number: RBUYLAN · RBUY-LAN · RBUY LAN
Bi-directional, direct-acting relief valve – common cavity. Cavity SC-10-02, capacity 20 gpm (80 L/min.). Genuine Sun Hydraulics cartridge — MultiFlow is an authorized distributor.
RBUY-LAN overview
RBUYLAN (RBUY-LAN, RBUY LAN) is a Sun Hydraulics Sun Hydraulics Bi-directional, direct-acting relief valve - common cavity, rated 20 gpm (80 L/min.) and installed in cavity SC-10-02. 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.
| RBUYLAN | Buna-N sealsBuna-N |
|---|---|
| RBUYLAV | Viton sealsViton |
Specifications
| Cavity | SC-10-02 |
|---|---|
| Series | 1C |
| Capacity | 20 gpm (80 L/min.) |
| Maximum Operating Pressure | 5000 psi (350 bar) |
| Factory Pressure Settings Established at | 2 in³/min. (30 cc/min.) |
| Ratio of Setting (Flow 2 to 1 : 1 to 2) | 1.8:1 |
| Reseat | >80% of setting |
| Adjustment - No. of CW Turns from Min. to Max. setting | 3.0 |
| Valve Hex Size | 25 mm |
| Valve Installation Torque | 23 - 26 lbf ft (31 - 35 Nm) |
| Adjustment Screw Internal Hex Size | 5/32 in. (4 mm) |
| Locknut Hex Size | 5/8 in. (16 mm) |
| Locknut Torque | 5 - 7 lbf ft |
| Model Weight | .62 lb |
| Seal kit - Cartridge | Viton: 99C102006 |
How to read RBUYLAN
Sun part numbers are the model followed by one code per option. Hyphens, slashes and spaces are only dividers, so RBUYLAN, RBUY-LAN, RBUY LAN are the same part.
| Model | RBUY — Sun Hydraulics Bi-directional, direct-acting relief valve - common cavity |
|---|---|
| Control | L — Standard Screw Adjustment |
| Adjustment Range | A — 300 - 3000 psi (20 - 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
- C — Tamper Resistant - Factory Set
- L — Standard Screw Adjustment
Adjustment Range options
- A — 300 - 3000 psi (20 - 210 bar), 1000 psi (70 bar) Standard Setting
Seal Material options
- N — Buna-N
- V — Viton
Manifold & standard assemblies
Sun manifolds for cavity SC-10-02 (12)
- JNA Sun Hydraulics Ninety degree Line mount manifoldRBUYLAN-JNA — request assembly
- JNB Sun Hydraulics Ninety degree Line mount manifoldRBUYLAN-JNB — request assembly
- JNC Sun Hydraulics Ninety degree Line mount manifoldRBUYLAN-JNC — request assembly
- JND Sun Hydraulics Ninety degree Line mount manifoldRBUYLAN-JND — request assembly
- JNH Sun Hydraulics Ninety degree Line mount manifoldRBUYLAN-JNH — request assembly
- JNI Sun Hydraulics Ninety degree Line mount manifoldRBUYLAN-JNI — request assembly
- JNJ Sun Hydraulics Ninety degree Line mount manifoldRBUYLAN-JNJ — request assembly
- JNK Sun Hydraulics Ninety degree Line mount manifoldRBUYLAN-JNK — request assembly
- JNT Sun Hydraulics Ninety degree Line mount manifoldRBUYLAN-JNT — request assembly
- JNU Sun Hydraulics Ninety degree Line mount manifoldRBUYLAN-JNU — request assembly
- JNV Sun Hydraulics Ninety degree Line mount manifoldRBUYLAN-JNV — request assembly
- JNW Sun Hydraulics Ninety degree Line mount manifoldRBUYLAN-JNW — request assembly
Technical features
- Because the modulating occurs inside the cartridge, these valves are immune to most of the problems associated with cavitation, namely manifold erosion.
- Directional ratio: Pressure setting (2->1) = 1.8*pressure setting (1->2).
- 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.
- A deep socket will be needed to install the valve, if the locating shoulder is recessed into the manifold and a crows foot cannot be used to install it.
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 RBUYLAN the same as RBUY-LAN?
Yes. Sun Hydraulics writes this part number as RBUYLAN. It is the model RBUY followed by the configuration code; hyphens, slashes and spaces are only dividers, so RBUYLAN, RBUY-LAN, RBUY LAN all refer to the same product.
Do you supply RBUYLAN in the UAE, GCC and India?
Yes. MultiFlow supplies genuine Sun Hydraulics cartridges, including RBUYLAN, 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?
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/RBUY
