RBAE-KEN Sun Hydraulics Relief Valve 10 L/min

Product Overview

The Sun Hydraulics RBAE-KEN is a two-port, pilot-stage, direct-acting relief cartridge designed for pilot-capacity pressure control applications.

The RBAE family uses the T-8A cavity, provides 10 L/min nominal capacity, and is rated for 350 bar maximum operating pressure. The RBAE-KEN configuration specifically combines K handknob adjustment, the E pressure range of 1.7–28 bar, and N Buna-N sealing.

The valve is primarily intended to act as a pilot stage for larger Sun pilot-operated hydraulic valves. Sun’s technical guidance explains that RBAE pilot relief cartridges can remotely control the pressure setting of larger relief, sequence and reducing valves.

The additional models in the original title represent different hydraulic functions:

• PPFB-LBN — pilot-operated pressure reducing/relieving valve
• CEBC-LHN — semi-restrictive LoadAdaptive counterbalance valve
• CVGV-XCN — 240 L/min vented pilot-to-open check valve
• CVIV-XCN — 480 L/min vented pilot-to-open check valve
• CBCGT-11A — CBCG-related counterbalance configuration requiring complete-code verification

They should therefore be treated as related Sun Hydraulics cartridge products rather than interchangeable versions of RBAE-KEN.

Technical Specifications

RBAE-KEN

• Model: RBAE-KEN
• Brand: Sun Hydraulics
• Valve Type: Two-port, pilot-stage, direct-acting relief cartridge
• Functional Role: Pilot-capacity pressure control
• Cavity: T-8A
• Series: P
• Nominal Capacity: 10 L/min (2.5 GPM)
• Maximum Operating Pressure: 350 bar (5000 psi)
• Adjustment Control: K — Handknob
• Adjustment Range: E — 1.7–28 bar (25–400 psi)
• Standard Factory Setting: 14 bar (200 psi) for the E range
• Seal: N — Buna-N
• Typical Response Time: 2 ms
• Maximum Leakage: 1 cc/min at 24 cSt
• Valve Hex: 22.2 mm / 7/8 in
• Installation Torque: 27–33 Nm
• Adjustment Screw Hex: 4 mm
• Locknut Hex: 15 mm
• Locknut Torque: 9–10 Nm
• Weight: approx. 0.13 kg
• Construction: Floating-style cartridge.

PPFB-LBN

• Model: PPFB-LBN
• Brand: Sun Hydraulics
• Valve Type: Pilot-operated pressure reducing/relieving valve
• Cavity: T-2A
• Series: 2
• Nominal Capacity: 80 L/min (20 GPM)
• Maximum Operating Pressure: 350 bar
• Control Pilot Flow: 0.16–0.25 L/min
• Adjustment: L — Standard Screw
• Adjustment Range: Five turns
• Valve Hex: 28.6 mm
• Installation Torque: 61–68 Nm
• Adjustment Screw Hex: 4 mm
• Locknut Torque: 9–10 Nm
• Function: Pressure reduction at Port 1 with full-flow relief from Port 1 to tank Port 3
• Port 3 Back Pressure: Directly additive at a 1:1 ratio; maximum Port 3 pressure 210 bar.

CEBC-LHN

• Model: CEBC-LHN
• Brand: Sun Hydraulics
• Valve Type: LoadAdaptive counterbalance valve
• Cavity: T-11A
• Pilot Ratio: 3:1
• Control: L — Standard Screw
• Seal: N — Buna-N
• Function: Load holding and controlled load release
• Characteristic: Semi-restrictive, LoadAdaptive
• Exact flow and pressure range: Not independently verified for the complete CEBC-LHN code from a current primary Sun document located.

CVGV-XCN

• Model: CVGV-XCN
• Brand: Sun Hydraulics
• Valve Type: Vented pilot-to-open check valve
• Cavity: T-23A
• Series: 3
• Nominal Capacity: 240 L/min (60 GPM)
• Pilot Ratio: 3:1
• Maximum Operating Pressure: 350 bar
• Control: X — Standard Pilot
• Cracking Pressure: 2 bar
• Seal: Buna-N
• Valve Hex: 31.8 mm
• Installation Torque: 200–215 Nm
• Maximum Leakage: 0.07 cc/min at 24 cSt
• Weight: approx. 0.64 kg.

CVIV-XCN

• Model: CVIV-XCN
• Brand: Sun Hydraulics
• Valve Type: Vented pilot-to-open check valve
• Cavity: T-24A
• Series: 4
• Nominal Capacity: 480 L/min (120 GPM)
• Pilot Ratio: 3:1
• Maximum Operating Pressure: 350 bar
• Control: X — Standard Pilot
• Cracking Pressure: 2 bar
• Seal: Buna-N
• Valve Hex: 41.3 mm
• Installation Torque: 475–500 Nm
• Maximum Leakage: 0.07 cc/min at 24 cSt
• Weight: approx. 1.51 kg.

CBCGT-11A

• Model: CBCGT-11A
• Brand: Sun Hydraulics
• Product Family: CBCG counterbalance family
• Hydraulic Function: Load holding / overrunning-load control
• Pilot Ratio: CBCG family documentation identifies 4.5:1
• Maximum Operating Pressure: CBCG family documentation identifies 350 bar
• Exact suffix interpretation: Requires complete-code verification
• Exact flow, setting range and weight: Not stated as certified values without the exact primary model document

Key Technical Advantages

Fast 2 ms Pilot Response

The RBAE family has a typical response time of 2 ms, making RBAE-KEN suitable for fast pilot-pressure control applications where response speed is more important than high main-stage flow capacity.

Low-to-Medium Pilot Pressure Range

The E configuration provides a 1.7–28 bar adjustment range, making RBAE-KEN useful for lower-pressure pilot-control applications.

Handknob Adjustment

The K control identifies a handknob configuration, which is practical for applications requiring repeated field adjustment without using a hex key.

Combined Reducing and Relieving Function

PPFB-LBN combines pressure reduction and full-flow relief within one cartridge architecture. Its 80 L/min capacity makes it suitable for substantially higher-flow circuits than the RBAE-KEN pilot cartridge.

High-Capacity Pilot-to-Open Check Valves

CVGV-XCN and CVIV-XCN provide 240 L/min and 480 L/min capacity respectively, with 3:1 pilot ratio and 350 bar maximum operating pressure, supporting high-flow load-holding systems.

Standardized Cartridge Architecture

The models span T-8A, T-2A, T-11A, T-23A and T-24A cavity platforms, allowing engineers to integrate pressure-control and load-control functions directly into hydraulic manifolds.

Floating-Style Construction

Sun’s floating-style cartridge construction is designed to reduce the risk of internal component binding caused by excessive installation torque and cavity/cartridge machining variation.

Application Areas

RBAE-KEN

• Pilot pressure-control circuits
• Remote relief-valve control
• Sequence-valve pilot circuits
• Reducing-valve pilot circuits
• Hydraulic power units
• Compact hydraulic manifolds

PPFB-LBN

• Hydraulic power units
• Secondary pressure-control circuits
• Pressure reducing circuits
• Industrial hydraulic manifolds
• Machine tools
• Mobile auxiliary hydraulic circuits

CEBC-LHN / CBCG

• Hydraulic cylinders
• Boom circuits
• Winches
• Hoists
• Lifting equipment
• Load-holding systems
• Controlled lowering circuits

CVGV-XCN / CVIV-XCN

• Heavy-duty cylinders
• Large hydraulic actuators
• Crane systems
• Lifting machinery
• High-flow mobile hydraulics
• Hydraulic locking circuits
• High-capacity manifolds

Expert Maintenance Tips

Verify the E Pressure Range on RBAE-KEN

The E position in RBAE-KEN identifies the 1.7–28 bar adjustment range. Do not substitute this configuration for a higher-pressure RBAE variant simply because the cavity is the same.

Distinguish K From L Adjustment

Within the RBAE family:

• K = Handknob
• L = Standard adjustment screw
• O = Panel-mount handknob
• Y = Tri-grip handknob

These configurations can have different field-adjustment requirements even when the hydraulic cavity is identical.

Maintain Clean Pilot Oil

Because RBAE-KEN operates as a pilot-stage pressure-control element, contamination can affect the small control passage and valve seat. Inspect pilot passages, seals, filtration and the adjustment mechanism during service.

Account for PPFB-LBN Tank-Port Pressure

PPFB-LBN tank-port pressure adds directly to the valve setting at a 1:1 ratio, and Port 3 should not exceed 210 bar. Return-line design must therefore account for back pressure.

Use the Correct CVGV/CVIV Installation Torque

• CVGV-XCN: 200–215 Nm
• CVIV-XCN: 475–500 Nm

These values are substantially different and must not be interchanged.

Keep the CVIV Vent Port Open

Sun’s vented pilot-to-open check documentation warns that the vent port should not be blocked, because seal weepage can eventually cause valve malfunction.

Analyze Counterbalance Stability

For CEBC-LHN/CBCG applications, investigate pilot ratio, load pressure, flow, valve setting and pilot-line damping whenever chatter or unstable lowering occurs. Changing the pressure setting alone may not solve a counterbalance instability problem.

Verify the Complete Model Code

Cartridge replacement should be based on:

Part Number → Cavity → Function → Pressure Range → Control → Seal

rather than on the first four letters of the model code.

Apply 100% Simulated Working-Condition Testing

For your replacement products, a suitable factory test should reproduce:

Hydraulic Source → Cartridge Valve → Pilot/Load Circuit → Actuator Load

and measure:

• Pressure response
• Flow response
• Pilot response
• Leakage
• Adjustment repeatability
• Load-release stability
• Repeated-cycle performance
• Thermal behavior

This provides a much stronger basis for in-place interchangeability than visual inspection or static dimensional checking alone.