Product Overview

The Sun Hydraulics CXED-XAN is a Free-Flow Check Valve designed to permit hydraulic flow in one direction while blocking reverse flow.

The CXED belongs to Sun Hydraulics’ CX*D side-to-nose check-valve family. It provides free flow from Port 2 to Port 1 and blocks flow from Port 1 to Port 2. The official Sun Hydraulics documentation identifies the CXED as a 30 GPM / approximately 120 L/min cartridge installed in a T-5A cavity, with a 5000 psi / 350 bar maximum operating pressure.

The complete CXED-XAN configuration can be interpreted as:

• CXE: 30 GPM nominal capacity frame
• D: Side-to-Nose flow path
• X: Non-adjustable
• A: 4 psi cracking pressure
• N: Buna-N seal

The CX*D configuration is considered the non-preferred flow direction by Sun Hydraulics, but it can be valuable when existing manifold drilling or circuit routing requires reverse flow orientation.

For OEM replacement and retrofit applications, the valve can be engineered for in-place interchangeability according to cavity, flow direction, cracking pressure and seal configuration, followed by 100% simulated working-condition testing.

Technical Specifications

CXED-XAN

• Manufacturer: Sun Hydraulics
• Product Type: Free-Flow Check Valve
• Model Code: CXED-XAN
• Flow Configuration: Side-to-Nose
• Free Flow: Port 2 → Port 1
• Blocked Flow: Port 1 → Port 2
• Nominal Capacity: 30 GPM / approximately 120 L/min
• Cavity: T-5A
• Control: X = Non-adjustable
• Cracking Pressure: 4 psi / approximately 0.28 bar
• Seal Material: Buna-N
• Maximum Operating Pressure: 5000 psi / 350 bar
• Maximum Valve Leakage: Less than 1 drop/min.
• Cartridge Type: Screw-in cartridge
• Installation Torque: 45–50 lb·ft / approximately 61–68 N·m
• Adjustment: None

Related Model: PVDA-LAN

The PVDA-LAN is not a check valve. It is a pilot-operated reducing/relieving valve with external drain.

• Nominal Capacity: 40 L/min / 10 GPM
• Cavity: T-21A
• Control: Standard Screw Adjustment
• Adjustment: 5 turns
• Pressure Range A: 7–210 bar
• Maximum Operating Pressure: 350 bar
• Seal: Buna-N
• Installation Torque: 45–50 Nm
• External Drain: Port 4
• Maximum Port 3 Pressure: 210 bar
• Control Pilot Flow: 0.11–0.16 L/min

Related Model: PVFA-LAN

• Product Type: Pilot-Operated Reducing/Relieving Valve
• Nominal Capacity: 80 L/min / 20 GPM
• Cavity: T-22A
• Control: Standard Screw Adjustment
• Adjustment: 5 turns
• Pressure Range A: 7–210 bar
• Maximum Operating Pressure: 350 bar
• Seal: Buna-N
• Installation Torque: 60–70 Nm
• External Drain: Port 4
• Maximum Port 3 Pressure: 210 bar
• Control Pilot Flow: 0.16–0.25 L/min

Related Model: PVHA-LAN

• Product Type: Pilot-Operated Reducing/Relieving Valve
• Nominal Capacity: 160 L/min / 40 GPM
• Cavity: T-23A
• Control: Standard Screw Adjustment
• Adjustment: 5 turns
• Pressure Range A: 7–210 bar
• Maximum Operating Pressure: 350 bar
• Seal: Buna-N
• Installation Torque: 200–215 Nm
• External Drain: Port 4
• Maximum Port 3 Pressure: 210 bar
• Control Pilot Flow: 0.25–0.33 L/min

Related Model: PVJA-LAN

• Product Type: Pilot-Operated Reducing/Relieving Valve
• Nominal Capacity: 320 L/min / 80 GPM
• Cavity: T-24A
• Control: Standard Screw Adjustment
• Adjustment: 5 turns
• Pressure Range A: 7–210 bar
• Maximum Operating Pressure: 350 bar
• Seal: Buna-N
• Installation Torque: 465–500 Nm
• External Drain: Port 4
• Maximum Port 3 Pressure: 210 bar
• Control Pilot Flow: 0.25–0.33 L/min

Related Model: CBCA-LAN

The CBCA-LAN is a standard counterbalance valve, not a conventional check valve.

• Product Type: Standard Counterbalance Valve
• Nominal Capacity: 15 GPM / approximately 57 L/min
• Cavity: T-11A
• Pilot Ratio: 3:1
• Control: Standard Screw Adjustment
• Check Spring: 4 psi
• Adjustment Range: 1000–4000 psi / 70–280 bar
• Standard Factory Setting: 3000 psi / approximately 210 bar
• Maximum Setting: 4000 psi / approximately 280 bar
• Seal: Buna-N
• Installation Torque: 30–35 lb·ft / approximately 40–47 Nm

Sun Hydraulics specifies counterbalance valves for overrunning-load control and recommends setting the valve at least 1.3 times the maximum load-induced pressure.

Displacement, Maximum Speed and Peak Pressure

The products in this group are hydraulic cartridge valves rather than hydraulic pumps or motors.

• Displacement: Not applicable
• Maximum Speed: Not applicable
• CXED-XAN Maximum Operating Pressure: 350 bar / 5000 psi
• Peak Pressure: No separate model-specific peak-pressure rating is assigned here without verified manufacturer documentation.

Key Technical Advantages

1. 30 GPM Flow Capacity

The CXED belongs to the Sun Hydraulics 30 GPM frame and provides approximately:

120 L/min / 30 GPM

This makes it suitable for medium-to-high flow hydraulic manifold applications.

2. 4 psi Cracking Pressure

The CXED-XAN uses a:

4 psi / 0.28 bar cracking pressure

configuration.

Sun Hydraulics provides multiple cracking-pressure spring options across the CX*D family, allowing engineers to select the appropriate opening differential for the circuit.

3. Side-to-Nose Flow Path

CXED provides:

Port 2 → Port 1 free flow

with:

Port 1 → Port 2 reverse blocking

Sun Hydraulics identifies the CXD family as the non-preferred side-to-nose flow configuration, useful for simplifying complex manifold routing where the preferred CXA flow direction is unsuitable.

4. Hardened and Lapped Sealing Surfaces

Sun Hydraulics uses hardened and lapped sealing surfaces within its check-valve construction to support low leakage and long service life.

The published typical leakage limit is less than one drop per minute.

5. Non-Adjustable Configuration

The X designation identifies a non-adjustable configuration.

The cracking pressure is established by the internal spring configuration, which is useful for standardized OEM hydraulic circuits.

6. T-5A Cartridge Integration

CXED uses a:

T-5A cavity

allowing the check valve to be integrated directly into a hydraulic manifold, reducing external piping and packaging requirements.

Application Areas

CXED-XAN

• Hydraulic Power Units
• Industrial Hydraulic Manifolds
• Construction Machinery
• Mobile Hydraulic Equipment
• Material Handling Machinery
• Hydraulic Presses
• Injection Molding Equipment
• Hydraulic Cylinder Supply Circuits
• Pump Outlet Protection
• High-Flow Hydraulic Isolation Circuits

PVDA / PVFA / PVHA / PVJA

• Pressure Reducing Circuits
• Pressure Reducing/Relieving Systems
• Multi-Pressure Hydraulic Systems
• Industrial Hydraulic Power Units
• Clamping Systems
• Hydraulic Actuator Pressure Regulation

CBCA-LAN

• Overrunning Load Control
• Hydraulic Lifting Systems
• Winches
• Boom Circuits
• Vertical Load Control
• Controlled Lowering Systems

Expert Maintenance Tips

1. Verify the T-5A Cavity

The CXED-XAN must be installed in the correct:

T-5A cavity

Cavity verification is essential before cartridge replacement.

2. Verify Flow Direction

CXED is a side-to-nose check valve:

Port 2 → Port 1 = Free Flow

Port 1 → Port 2 = Blocked

Do not replace a CXED with a CXEA/CXFA simply because the cartridge cavity is compatible. Sun Hydraulics specifically distinguishes the flow directions of CXA and CXD configurations.

3. Match the 4 psi Cracking Pressure

CXED-XAN uses 4 psi.

Other CX*D configurations include:

• XBN — 15 psi
• XCN — 30 psi
• XDN — 50 psi
• XEN — 75 psi
• XFN — 100 psi

The complete model code must therefore be verified before replacement.

4. Use 45–50 lb·ft Installation Torque

The published installation torque for CXED is:

45–50 lb·ft

or approximately:

61–68 N·m

Use a calibrated torque wrench and clean the cartridge cavity before installation.

5. Inspect the Poppet and Seat

For reverse leakage or pressure decay, inspect:

Poppet → Seat → Contamination → Seal Condition

The integrity of the seating surfaces is critical to maintaining check-valve shutoff performance.

6. Account for Port 4 Pressure on PV Series Valves

The PVDA/PVFA/PVHA/PVJA family uses external drainage through Port 4.

Sun Hydraulics specifies that Port 4 pressure is directly additive to the valve setting at a 1:1 ratio, and that Port 4 pressure must not exceed 350 bar.

7. Do Not Substitute CBCA-LAN for a Conventional Check Valve

CBCA-LAN is designed for:

Counterbalance / Overrunning Load Control

while CXED-XAN is designed for:

One-Way Free Flow / Reverse Blocking

These are fundamentally different hydraulic functions and should not be treated as interchangeable merely because both are Sun Hydraulics cartridge valves.