RPKD-BBN – Sun Hydraulics Air-controlled, pilot-operated, balanced piston relief valve
Part number: RPKDBBN · RPKD-BBN · RPKD BBN
Air-controlled, pilot-operated, balanced piston relief valve. Cavity T-18A, capacity 200 gpm (760 L/min.). Genuine Sun Hydraulics cartridge — MultiFlow is an authorized distributor.
RPKD-BBN overview
RPKDBBN (RPKD-BBN, RPKD BBN) is a Sun Hydraulics Sun Hydraulics Air-controlled, pilot-operated, balanced piston relief valve, rated 200 gpm (760 L/min.) and installed in cavity T-18A. 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.
| RPKDBBN | Buna-N sealsBuna-N |
|---|---|
| RPKDBBV | Viton sealsViton |
Specifications
| Cavity | T-18A |
|---|---|
| Series | 4 |
| Capacity | 200 gpm (760 L/min.) |
| Maximum Operating Pressure | 2000 psi (140 bar) |
| Pilot Ratio | 20:1 |
| Maximum Valve Leakage at 110 SUS (24 cSt) | 5 in³/min.@1000 psi (80 cc/min.@70 bar) |
| Maximum Air Pressure | 150 psi (10,5 bar) |
| Response Time - Typical | 10 ms |
| Valve Hex Size | 1 5/8 in. (41,3 mm) |
| Valve Installation Torque | 350 - 375 lbf ft (474 - 508 Nm) |
| Model Weight | 2.50 lb (1,15 kg) |
| Seal kit - Cartridge | Viton: 990018006 |
How to read RPKDBBN
Sun part numbers are the model followed by one code per option. Hyphens, slashes and spaces are only dividers, so RPKDBBN, RPKD-BBN, RPKD BBN are the same part.
| Model | RPKD — Sun Hydraulics Air-controlled, pilot-operated, balanced piston relief valve |
|---|---|
| Control | B — External 4-SAE Port |
| Operating Range | B — 50 - 1500 psi (3,5 - 105 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. |
Control options
- B — External 4-SAE Port
Operating Range options
- B — 50 - 1500 psi (3,5 - 105 bar)
- J — 25 - 1500 psi (1,7 - 105 bar)
Seal Material options
- N — Buna-N
- V — Viton
Manifold & standard assemblies
Sun manifolds for cavity T-18A (102)
- LA2 Sun Hydraulics Ninety degree with gauge port Line mount manifoldRPKDBBN-LA2 — request assembly
- LA4 Sun Hydraulics Ninety degree with gauge port Line mount manifoldRPKDBBN-LA4 — request assembly
- LA5 Sun Hydraulics Ninety degree with gauge port Line mount manifoldRPKDBBN-LA5 — request assembly
- LA6 Sun Hydraulics Ninety degree with gauge port Line mount manifoldRPKDBBN-LA6 — request assembly
- LA7 Sun Hydraulics Ninety degree with gauge port Line mount manifoldRPKDBBN-LA7 — request assembly
- LA8 Sun Hydraulics Ninety degree with gauge port Line mount manifoldRPKDBBN-LA8 — request assembly
- LA9 Sun Hydraulics Ninety degree with gauge port Line mount manifoldRPKDBBN-LA9 — request assembly
- LAD Sun Hydraulics Ninety degree with gauge port Line mount manifoldRPKDBBN-LAD — request assembly
- LAE Sun Hydraulics Ninety degree with gauge port Line mount manifoldRPKDBBN-LAE — request assembly
- LAF Sun Hydraulics Ninety degree with gauge port Line mount manifoldRPKDBBN-LAF — request assembly
- LAL Sun Hydraulics Ninety degree with gauge port Line mount manifoldRPKDBBN-LAL — request assembly
- LAM Sun Hydraulics Ninety degree with gauge port Line mount manifoldRPKDBBN-LAM — 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.
- Maximum air pressure should not exceed 150 psi (10 bar).
- 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 RPKDBBN the same as RPKD-BBN?
Yes. Sun Hydraulics writes this part number as RPKDBBN. It is the model RPKD followed by the configuration code; hyphens, slashes and spaces are only dividers, so RPKDBBN, RPKD-BBN, RPKD BBN all refer to the same product.
Do you supply RPKDBBN in the UAE, GCC and India?
Yes. MultiFlow supplies genuine Sun Hydraulics cartridges, including RPKDBBN, 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/RPKD
