CNCE-XCN Sun Hydraulics Pilot Check Valve 350 Bar

Product Overview

The Sun Hydraulics CNCE-XCN is a pilot-to-open check valve cartridge designed for hydraulic load holding, locking and controlled load release.

Sun’s technical documentation identifies the CNCE family as a T-11A cavity, 3-port pilot-operated check valve. The standard flow path is free flow from Port 2 to Port 1, while reverse flow from Port 1 to Port 2 is blocked until pilot pressure is applied at Port 3. The CNCE-XCN configuration uses a 3:1 pilot ratio, a 60 L/min nominal capacity and a 350 bar maximum operating pressure.

The original product title also includes several completely different Sun cartridge families:

• CBCG — 4.5:1 pilot-ratio counterbalance valve
• DWDA-DAN — solenoid-operated 3-way poppet directional valve
• DMDA-MAN — solenoid-operated 3-way balanced-spool directional valve
• DAAA-MCN — low-capacity 2-way pilot control valve
• DTDA-MHN — solenoid-operated 2-way poppet directional valve
• NCFB-LCN — adjustable needle valve with reverse free-flow check

These should therefore be treated as related Sun Hydraulics cartridge models, not interchangeable versions of CNCE-XCN.

For replacement engineering, the correct identification sequence is:

Function → Cavity → Flow Direction → Pilot Ratio → Setting → Seal → Complete Model Code

Technical Specifications

CNCE-XCN

• Model: CNCE-XCN
• Brand: Sun Hydraulics
• Valve Type: Pilot-to-open check valve
• Cavity: T-11A
• Series: 1
• Nominal Capacity: 60 L/min (15 GPM)
• Maximum Operating Pressure: 350 bar (5000 psi)
• Pilot Ratio: 3:1
• Orifice Range: 0.4–3.9 mm
• Control: X — Not Adjustable
• Setting: C — 2 bar cracking pressure for the documented configuration
• Seal: N — Buna-N
• Alternative Seal: Viton options are available within the CNCE family
• Flow Direction: Port 2 → Port 1 free flow
• Reverse Flow: Port 1 → Port 2 pilot-to-open
• Pilot Port: Port 3
• Hex Size: 22.2 mm / 7/8 in
• Installation Torque: 41–47 Nm
• Weight: approx. 0.13 kg
• Construction: Sun floating-style cartridge architecture.

CBCG

• Model Family: CBCG
• Valve Type: Pilot-assisted counterbalance valve
• Cavity: T-11A
• Series: 1
• Nominal Capacity: 60 L/min
• Pilot Ratio: 4.5:1
• Maximum Setting: 350 bar
• Maximum Recommended Load Pressure at Maximum Setting: 270 bar
• Factory Setting Flow: 30 cc/min
• Maximum Reseat Leakage: 0.3 cc/min
• Adjustment: approx. 3.75 turns
• Hex Size: 22.2 mm
• Installation Torque: 41–47 Nm
• Locknut Torque: 9–10 Nm
• Weight: approx. 0.16 kg
• Function: Overrunning-load control with free-flow check and pilot-assisted pressure regulation.

DWDA-DAN

• Model: DWDA-DAN
• Brand: Sun Hydraulics
• Valve Type: Direct-acting solenoid-operated directional poppet valve
• Configuration: 3-way, 2-position
• Typical Function: Normally open directional switching
• Cavity: T-11A configuration
• Control: Solenoid operated
• Maximum Operating Pressure: 350 bar for the documented modern configuration
• Typical Response: approx. 50 ms
• Switching Frequency: up to 15,000 cycles/hr
• Seal/Coil: determined by complete ordering code
• Manual Override: configuration dependent
• Primary Function: Electrical switching of a hydraulic directional/pilot path.

DMDA-MAN

• Model: DMDA-MAN
• Valve Type: Direct-acting solenoid-operated 3-way, 2-position directional valve
• Construction: Balanced spool
• Cavity: T-11A
• Nominal Capacity: 45 L/min (12 GPM)
• Maximum Operating Pressure: 350 bar
• Typical Response: 50 ms
• Switching Frequency: 15,000 cycles/hr
• Manual Override: M configuration
• Valve Leakage: approx. 80 cc/min at 210 bar / 24 cSt
• Installation Torque: 41–47 Nm
• Weight: approx. 0.30 kg
• Special Feature: Direct actuation requires no minimum hydraulic pressure.

DAAA-MCN

• Model: DAAA-MCN
• Valve Type: Direct-acting balanced-spool pilot valve
• Configuration: 2-way, 2-position, normally closed
• Cavity: T-8A
• Nominal Capacity: 1 L/min
• Maximum Operating Pressure: 350 bar
• Typical Response: approx. 30 ms
• Power: approx. 12 W
• Operating Voltage Tolerance: ±10%
• Typical Function: Electrical pilot control for larger Sun pilot-operated or ventable cartridges
• Installation Torque: 35–40 Nm
• Seal: Buna-N for N configuration.

DTDA-MHN

• Model: DTDA-MHN
• Valve Type: Direct-acting solenoid-operated poppet directional valve
• Configuration: 2-way, 2-position
• Spool Configuration: Normally open
• Cavity: T-13A
• Nominal Capacity: 40 L/min (10 GPM)
• Maximum Operating Pressure: 350 bar
• Typical Response: 50 ms
• Switching Frequency: 15,000 cycles/hr
• Power: 22 W
• Operating Voltage Tolerance: ±10%
• Manual Override: M option
• Seal: Buna-N for N configuration
• Installation Torque: 40–50 Nm
• Function: Low-leakage directional switching and load-blocking applications.

NCFB-LCN

• Model: NCFB-LCN
• Valve Type: Fully adjustable needle valve with reverse free-flow check
• Cavity: T-16A
• Series: 3
• Nominal Capacity: 120 L/min (30 GPM)
• Maximum Orifice: 9.7 mm
• Maximum Operating Pressure: 350 bar
• Control: L — Standard Screw
• Adjustment: 5 turns
• Cracking Pressure: Configuration dependent
• Seal: Buna-N / Viton
• Reverse Flow: Integrated high-capacity check
• Maximum Leakage: approx. 0.7 cc/min at 24 cSt
• Hex Size: 31.8 mm / 1-1/4 in
• Installation Torque: 203–217 Nm
• Locknut Torque: 9–10 Nm
• Weight: approx. 0.60 kg.

Key Technical Advantages

3:1 Pilot-to-Open Load Holding

CNCE-XCN allows free flow in the charging direction and blocks reverse flow until a pilot command is applied. Its 3:1 pilot ratio allows controlled unlocking of a hydraulic load under pilot pressure.

Standard T-11A Cartridge Integration

The T-11A cavity provides a standardized cartridge interface suitable for manifold-based hydraulic architecture. However, cavity compatibility alone does not guarantee functional interchangeability.

4.5:1 Counterbalance Control

CBCG uses a 4.5:1 pilot ratio and is designed to control overrunning loads. Sun describes the circuit as combining free-flow checking with pilot-assisted relief control.

Direct Solenoid Switching

DMDA, DWDA and DTDA provide direct electrical hydraulic switching using different spool/poppet architectures. The architecture selected affects leakage, capacity and switching behavior.

Low-Leakage Directional Control

DTDA-MHN is documented as a low-leakage directional valve and is suitable for load-holding configurations when the normally closed option is selected.

High-Capacity Flow Regulation

NCFB-LCN offers 120 L/min nominal capacity with a 9.7 mm maximum orifice and an integrated reverse free-flow check, making it suitable for higher-flow metering applications.

Compact Pilot Logic

DAAA-MCN is designed as a pilot-capacity component rather than a main-flow directional valve. Its 1 L/min capacity is appropriate for electrically piloting larger Sun hydraulic cartridges.

Application Areas

CNCE-XCN

• Hydraulic cylinder load holding
• Hydraulic locking
• Crane outriggers
• Lifting equipment
• Excavator attachment circuits
• Controlled actuator release
• Safety locking systems

CBCG

• Overrunning-load control
• Winches
• Hoists
• Boom and arm circuits
• Mobile hydraulic machinery
• Controlled cylinder lowering
• Motion-control manifolds

DWDA-DAN / DMDA-MAN / DTDA-MHN

• Hydraulic pilot circuits
• Directional manifold switching
• Accumulator unloading
• Clutch and brake circuits
• Industrial power units
• Machine tools
• Mobile hydraulic systems

Engineering assembly records also show DWDA/DMDA valves used in pump, clutch/brake and hydraulic manifold assemblies.

DAAA-MCN

• Pilot-control circuits
• Pilot-operated relief-valve control
• Ventable cartridge control
• Hydraulic manifold logic
• Compact sequencing circuits

NCFB-LCN

• Meter-in flow control
• Meter-out flow control
• Cylinder speed control
• Hydraulic motor flow regulation
• Auxiliary hydraulic circuits
• High-flow cartridge manifolds

Expert Maintenance Tips

Verify Pilot Ratio Before Replacing CNCE

CNCE-XCN = 3:1 pilot ratio.

Sun counterbalance products are available with several pilot ratios, including 1.5:1, 2:1, 2.3:1, 3:1, 4.5:1 and 10:1. Selecting a different ratio can materially change load-release behavior.

Never Select a T-11A Cartridge by Cavity Alone

T-11A-related products may perform completely different functions:

• CNCE → Pilot-to-open check
• CBCG → Counterbalance
• DMDA → Solenoid directional
• DWDA → Solenoid poppet directional

Hydraulic logic must therefore be confirmed before replacement.

Verify CNCE Port Orientation

The intended hydraulic logic is:

2 → 1 = Free Flow

1 → 2 = Pilot-to-Open

3 = Pilot

Incorrect port orientation can completely change the load-holding behavior.

Analyze Counterbalance Stability

Sun notes that counterbalance circuits can become unstable. In many cases, a lower pilot ratio, more restrictive valve or smaller valve can improve circuit stability.

Verify Coil and Connector Configuration

DMDA, DWDA and DTDA valves can use different coil voltages, connectors, seals and manual-override configurations. DTDA options include multiple electrical connection and voltage configurations.

Monitor Wet-Armature Temperature

DMDA-MAN uses a wet-armature design, meaning the hydraulic fluid surrounds the armature and is exposed to coil-generated heat. Extended energization can therefore influence fluid condition and valve performance.

Treat DAAA-MCN as a Pilot Valve

DAAA-MCN is a 1 L/min pilot-capacity valve, not a primary high-flow directional valve. Its main role is to provide electrically operated pilot control to compatible Sun pilot-operated and ventable cartridges.

Consider Differential Pressure With NCFB-LCN

NCFB-LCN is a non-compensated needle valve, so:

Q ∝ √ΔP

The same five-turn setting can therefore produce different actual flow under different differential-pressure conditions.

Use the Correct Cartridge Torque

Typical values include:

• CNCE-XCN → 41–47 Nm
• CBCG → 41–47 Nm
• DMDA-MAN → 41–47 Nm
• DTDA-MHN → 40–50 Nm
• NCFB-LCN → 203–217 Nm

Torque must always be matched to the exact cavity and cartridge configuration.

Validate the Complete Hydraulic Function

For replacement testing:

CNCE-XCN:
Load → Port 1 Pressure → Pilot Pressure → Opening → Controlled Release

CBCG:
Load → Pilot Pressure → Counterbalance Response → Lowering Stability

DMDA / DWDA / DTDA:
Electrical Command → Valve Shift → Differential Pressure → Flow → Leakage → Cycling

NCFB-LCN:
Adjustment → Differential Pressure → Flow → Reverse Check → Leakage

Use 100% Simulated Working-Condition Testing

For your replacement product strategy, the most convincing validation is not a dimensional check alone. The test should reproduce representative hydraulic pressure, flow, pilot conditions and repeated-cycle loading, while recording:

• Opening / cracking pressure
• Pilot response
• Flow response
• Leakage
• Pressure stability
• Repeated-cycle performance
• Thermal behavior
• Electrical switching performance where applicable

This provides a stronger engineering basis for in-place interchangeability and 100% simulated working-condition testing.