RPES8WN – Sun Hydraulics Pilot-operated, balanced poppet relief main stage with integral T-8A control cavity, Standard Material/Coating

RPES8-WN Sun Hydraulics Relief Valve – installation dimensions drawing, cavity T-10A
RPES8-WN Sun Hydraulics Relief Valve – hydraulic schematic symbol
RPES8-WN Sun Hydraulics Relief Valve – performance curve (pressure drop vs flow)
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Part number: RPES8WN · RPES8-WN · RPES8 WN

Brand Sun HydraulicsType Relief ValvesCapacity 25 gpm (95 L/min.)Cavity T-10A

Pilot-operated, balanced poppet relief main stage with integral T-8A control cavity. Cavity T-10A, capacity 25 gpm (95 L/min.). Genuine Sun Hydraulics cartridge — MultiFlow is an authorized distributor.

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SKU: RPES8 Category: Brand:

RPES8-WN overview

RPES8WN (RPES8-WN, RPES8 WN) is a Sun Hydraulics Sun Hydraulics Pilot-operated, balanced poppet relief main stage with integral T-8A control cavity, rated 25 gpm (95 L/min.) and installed in cavity T-10A. 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.

RPES8WN/LH Mild Steel, Zinc-NickelMild Steel, Zinc-Nickel
RPES8WN Standard Material/CoatingStandard Material/Coating

Specifications

CavityT-10A
Series1
Capacity25 gpm (95 L/min.)
Maximum Operating Pressure5000 psi (350 bar)
Factory Pressure Settings Established at4 gpm (15 L/min.)
Control Pilot Flow10 - 25 in³/min. (0,16 - 0,41 L/min.)
Pilot Control CavityT-8A
Pilot Control Valve Installation Torque20 - 25 lbf ft (27 - 33 Nm)
Pilot Control Valve Hex Size7/8 in. (22,2 mm)
Main stage leakage at reseat10 drops/min. (0,7 cc/min.)
Response Time - Typical7 ms
Valve Hex Size7/8 in. (22,2 mm)
Valve Installation Torque30 - 35 lbf ft (41 - 47 Nm)
Model Weight.30 lb (0,15 kg)
Seal kit - CartridgeViton: 990310006

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 RPES8WN

Sun part numbers are the model followed by one code per option. Hyphens, slashes and spaces are only dividers, so RPES8WN, RPES8-WN, RPES8 WN are the same part.

ModelRPES8 — Sun Hydraulics Pilot-operated, balanced poppet relief main stage with integral T-8A control cavity
Adjustment RangeW — 100 - 5000 psi (7 - 350 bar)
Seal MaterialN — Buna-N
Material / coatingAdd /AP (stainless steel, passivated) or /LH (mild steel, zinc-nickel) to the end; no suffix is the standard finish.
Adjustment Range options
  • D — 50 - 1500 psi (3,5 - 105 bar)
  • W — 100 - 5000 psi (7 - 350 bar)
Seal Material options
  • N — Buna-N
  • V — Viton
  • E — EPDM
Material/coating options
  • /LH — Mild Steel, Zinc-Nickel
  • — Standard Material/Coating

Manifold & standard assemblies

Sun manifolds for cavity T-10A (293)

View all 293 →

Technical features

  • Because the modulating occurs inside the cartridge, these valves are immune to most of the problems associated with cavitation, namely noise and manifold erosion.
  • Cartridges configured with EPDM seals are for use in systems with phosphate ester fluids. Exposure to petroleum based fluids, greases and lubricants will damage the seals.
  • 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.
  • Valve is relatively insensitive to varying oil temperatures and oil borne contamination.
  • Main stage orifice is protected by a 150-micron stainless steel screen.
  • 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

RPES8-WN Sun Hydraulics Relief Valve – hydraulic schematic symbol
hydraulic schematic symbol
RPES8-WN Sun Hydraulics Relief Valve – performance curve (pressure drop vs flow)
performance curve (pressure drop vs flow)

Downloads

Datasheet

Technical reference sheets

CAD files

Frequently asked questions

Is RPES8WN the same as RPES8-WN?

Yes. Sun Hydraulics writes this part number as RPES8WN. It is the model RPES8 followed by the configuration code; hyphens, slashes and spaces are only dividers, so RPES8WN, RPES8-WN, RPES8 WN all refer to the same product.

Do you supply RPES8WN in the UAE, GCC and India?

Yes. MultiFlow supplies genuine Sun Hydraulics cartridges, including RPES8WN, 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 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 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.

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/RPES8

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