RPIC8-WN – Sun Hydraulics Pilot-operated, balanced piston relief main stage with integral T-8A control cavity
Part number: RPIC8WN · RPIC8-WN · RPIC8 WN
Pilot-operated, balanced piston relief main stage with integral T-8A control cavity. Cavity T-16A, capacity 100 gpm (380 L/min.). Genuine Sun Hydraulics cartridge — MultiFlow is an authorized distributor.
RPIC8-WN overview
RPIC8WN (RPIC8-WN, RPIC8 WN) is a Sun Hydraulics Sun Hydraulics Pilot-operated, balanced piston relief main stage with integral T-8A control cavity, 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.
| RPIC8WN | Buna-N sealsBuna-N |
|---|---|
| RPIC8WV | Viton sealsViton |
| RPIC8WE | EPDM sealsEPDM |
Specifications
| Cavity | T-16A |
|---|---|
| Series | 3 |
| Capacity | 100 gpm (380 L/min.) |
| Maximum Operating Pressure | 5000 psi (350 bar) |
| Control Pilot Flow | 15 - 20 in³/min. (0,25 - 0,33 L/min.) |
| Pilot Control Cavity | T-8A |
| Main stage leakage at 110 SUS (24 cSt) | 4 in³/min.@1000 psi (65 cc/min.@70 bar) |
| Valve Hex Size | 1 1/4 in. (31,8 mm) |
| Valve Installation Torque | 150 - 160 lbf ft (203 - 217 Nm) |
| Model Weight | 1.20 lb (0,55 kg) |
| Seal kit - Cartridge | Viton: 990016006 |
Compound cartridge (pilot and main stage) assembly information is provided for reference only. Cartridges must be ordered separately and assembled at point of use.
How to read RPIC8WN
Sun part numbers are the model followed by one code per option. Hyphens, slashes and spaces are only dividers, so RPIC8WN, RPIC8-WN, RPIC8 WN are the same part.
| Model | RPIC8 — Sun Hydraulics Pilot-operated, balanced piston relief main stage with integral T-8A control cavity |
|---|---|
| Adjustment Range | W — 100 - 5000 psi (7 - 350 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. |
Adjustment Range options
- D — 25 - 3000 psi (1,7 - 210 bar)
- W — 100 - 5000 psi (7 - 350 bar)
Seal Material options
- N — Buna-N
- V — Viton
- E — EPDM
Manifold & standard assemblies
Sun manifolds for cavity T-16A (161)
- CD4 Sun Hydraulics ISO 08: On A with reverse flow check Sandwich manifoldRPIC8WN-CD4 — request assembly
- CDC Sun Hydraulics ISO 08: A to T Sandwich manifoldRPIC8WN-CDC — request assembly
- CDD Sun Hydraulics ISO 08: B to T Sandwich manifoldRPIC8WN-CDD — request assembly
- CDO Sun Hydraulics ISO 08: P to T Sandwich manifoldRPIC8WN-CDO — request assembly
- CDV Sun Hydraulics ISO 08: T to A and B Sandwich manifoldRPIC8WN-CDV — request assembly
- CDW Sun Hydraulics ISO 08: A to B and B to A Sandwich manifoldRPIC8WN-CDW — request assembly
- CDZ Sun Hydraulics ISO 08: A and B to T Sandwich manifoldRPIC8WN-CDZ — request assembly
- CK4 Sun Hydraulics ISO 07: On A with reverse flow check Sandwich manifoldRPIC8WN-CK4 — request assembly
- CKD Sun Hydraulics ISO 07: A to T with gage port Sandwich manifoldRPIC8WN-CKD — request assembly
- IA4 Sun Hydraulics Ninety degree with gauge port Line mount manifoldRPIC8WN-IA4 — request assembly
- IA5 Sun Hydraulics Ninety degree with gauge port Line mount manifoldRPIC8WN-IA5 — request assembly
- IA6 Sun Hydraulics Ninety degree with gauge port Line mount manifoldRPIC8WN-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.
- Main stage orifice is protected by a 150-micron stainless steel screen.
- 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.
- NOTE: With the -8 control option, the main stage valve should first be installed to the correct torque value. The T-8A pilot control valve should then be installed into the main stage valve to its required torque value.
- The -8 control option allows the pilot control valve to be incorporated directly into the end of the relief cartridge via the T-8A cavity. These pilot control cartridges are sold separately and include electro-proportional, solenoid, air pilot, and hydraulic pilot operation. See Pilot Control Cartridges.
- 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_Amplifier-New (PDF 2 MB)
- TT_US_Cavity-New (PDF 522 KB)
- TT_US_Electro-Prop (PDF 1 MB)
- TT_US_Relief-N (PDF 656 KB)
- TT_US_coils-New (PDF 975 KB)
- rel-Prop_terms-definitionsN (PDF 3 MB)
CAD files
Frequently asked questions
Is RPIC8WN the same as RPIC8-WN?
Yes. Sun Hydraulics writes this part number as RPIC8WN. It is the model RPIC8 followed by the configuration code; hyphens, slashes and spaces are only dividers, so RPIC8WN, RPIC8-WN, RPIC8 WN all refer to the same product.
Do you supply RPIC8WN in the UAE, GCC and India?
Yes. MultiFlow supplies genuine Sun Hydraulics cartridges, including RPIC8WN, 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.
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.
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.
How do I get a kick-down relief to reset?
The kick-down relief acts much like a circuit breaker. When the pressure at the inlet (port 1) of the relief valve rises to the setting, the valve pops open and drops the pressure down to 100 psi or so. The valve stays open until flow through it stops. Shutting off the supply of oil will reset the valve; reversing pressure on the valve is a positive way of resetting it.
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.
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/RPIC8
