CXJA.XDN CRIB.XCN CAIG.LGN Sun Hydraulics Cartridge Valve 420 bar

Product Overview

⚠️ Brand and Product Type Attribution Note: Verified sources confirm that CXJA.XDN, CRIB.XCN, and CAIG.LGN all belong to the Sun Hydraulics brand. The original title’s reference to “pressure reducing valve” differs from the actual product functions as follows:

• CXJA.XDN is a Free Flow Check Valve

• CAIG.LGN is a Vented Counterbalance Valve

• CRIB.XCN is a Pilot-to-Open Check Valve

CXJA.XDN is a free flow nose-to-side check valve from Sun Hydraulics. It is an on/off circuit component that allows free flow from the inlet (port 1) to the outlet (port 2) while blocking flow in the opposite direction. Featuring a T-18A cavity, it offers a flow capacity of 610 L/min.

CAIG.LGN is a 5:1 pilot ratio, vented counterbalance valve from Sun Hydraulics. It is designed to control overrunning loads, allowing free flow from the directional valve (port 2) to the load (port 1) while a direct-acting, pilot-assisted relief valve controls flow from port 1 to port 2. Featuring a T-19A cavity, it offers a flow capacity of 480 L/min.

CRIB.XCN is a pilot-to-open check valve from Sun Hydraulics. It features a 3:1 pilot ratio and a non-sealed pilot design. Featuring a T-19A cavity, it offers a flow capacity of 480 L/min. It is applicable for high-pressure load holding, anti-drifting, and hose burst protection.

Our complete range of Sun Hydraulics cartridge valves strictly adheres to OEM technical standards, achieving 100% direct interchangeability with original components. Every unit undergoes 100% simulated operating condition bench testing prior to shipment, ensuring performance parameters are fully consistent with genuine Sun Hydraulics products.

Technical Specifications 

CXJA.XDN (Free Flow Nose-to-Side Check Valve)

• Product Series: Sun Hydraulics CXJA series free flow check valve

• Model Code: CXJA.XDN

• Brand: Sun Hydraulics

• Product Type: Free flow check valve

• Cavity: T-18A

• Series: 4

• Maximum Flow Capacity: 610 L/min (160 gpm)

• Maximum Operating Pressure: 350 bar (5000 psi)

• Maximum Leakage at 24 cSt: 1 drop/min (0.07 cc/min)

• Valve Hex Size: 41.3 mm (1 5/8 in)

• Valve Installation Torque: 474 – 508 Nm (350 – 375 lbf·ft)

• Weight: Approx. 0.95 – 0.96 kg

• Seal Kits: Buna: 990018007; EPDM: 990018014; Viton: 990018006

• Features: Sun floating style construction

CAIG.LGN (Vented Counterbalance Valve)

• Product Series: Sun Hydraulics CAIG series counterbalance valve

• Model Code: CAIG.LGN

• Brand: Sun Hydraulics

• Product Type: Vented counterbalance valve

• Cavity: T-19A

• Series: 2

• Maximum Flow Capacity: 480 L/min

• Maximum Operating Pressure: 420 bar

• Pilot Ratio: 5:1

• Maximum Recommended Load Pressure at Max Setting: 320 bar (4615 psi)

• Maximum Setting: 420 bar (6000 psi)

• Maximum Leakage at Reseat: 5 drops/min (0.3 cc/min)

• Check Cracking Pressure: 1.7 bar (25 psi)

• Reseat: ≥85% of setting

• Adjustment: 5 CCW turns from min. to max. setting

• Valve Hex Size: 28.6 mm (1 1/8 in)

• Valve Installation Torque: 61 – 68 Nm (45 – 50 lbf·ft)

• Weight: 0.30 kg (0.60 lb)

• Seal Kits: Buna: 990302007; Viton: 990302006

• Features: Atmospherically referenced spring chamber – port 2 backpressure does not affect valve setting

CRIB.XCN (Pilot-to-Open Check Valve)

• Product Series: Sun Hydraulics CRIB series pilot-to-open check valve

• Model Code: CRIB.XCN

• Brand: Sun Hydraulics

• Product Type: Pilot-to-open check valve

• Cavity: T-19A

• Maximum Flow Capacity: 480 L/min

• Maximum Operating Pressure: 350 bar (5000 psi)

• Pilot Ratio: 3:1

• Maximum Leakage: 1 drop/min (0.07 cc/min)

• Pilot Type: Non-sealed pilot

• Applications: High-pressure load holding, anti-drifting, hose burst protection

• Minimum Pilot Opening Pressure: Approx. 3 bar (45 psi)

• Features: Sun floating style construction

Key Technical Advantages

1. Sun Hydraulics Standardized Cavity Design – 100% Interchangeability

CXJA.XDN utilizes the T-18A cavity, while CAIG.LGN and CRIB.XCN utilize the T-19A cavity. All cartridge valves within the same cavity size are physically and functionally interchangeable. This standardization ensures 100% direct interchangeability without any manifold modification or system adjustment.

2. Sun Floating Style Construction – Reduced Binding Risk

All products incorporate Sun Hydraulics’ patented floating style construction. This design significantly reduces the risk of internal parts binding due to excessive installation torque or cavity/cartridge machining variations, enhancing installation reliability and service life.

3. Ultra-High Flow and Pressure Ratings

CXJA.XDN supports 610 L/min flow and 350 bar pressure. CAIG.LGN supports 480 L/min flow and 420 bar pressure. CRIB.XCN supports 480 L/min flow and 350 bar pressure. The large flow capacity makes these valves suitable for heavy construction machinery and industrial hydraulic systems.

4. Extremely Low Leakage for System Holding Performance

CXJA.XDN offers leakage of only 1 drop/min (0.07 cc/min) . CAIG.LGN offers leakage of 5 drops/min (0.3 cc/min) at reseat. CRIB.XCN offers leakage of 1 drop/min (0.07 cc/min) . The extremely low leakage ensures long-term stability in load holding circuits.

5. CAIG.LGN – Vented Counterbalance Valve with Port 2 Backpressure Immunity

CAIG.LGN features an atmospherically referenced spring chamber. Backpressure at port 2 does NOT add to the valve setting at a 1:1 ratio. This design is particularly important in systems with significant return line backpressure, ensuring load control accuracy is not compromised.

6. 5:1 Pilot Ratio for Precise Load Control (CAIG.LGN)

CAIG.LGN features a 5:1 pilot ratio. Pilot pressure at port 3 reduces the effective relief setting at a rate determined by the pilot ratio. The valve should be set to at least 1.3 times the maximum load-induced pressure for reliable load control.

7. 100% Simulated Operating Condition Testing

Every unit undergoes 100% simulated operating condition bench testing prior to shipment, ensuring consistent, stable performance at rated pressure and flow.

Application Areas

• CXJA.XDN (Free Flow Check Valve) :

  • Hydraulic system isolation and check applications

  • Pump outlet protection and bypass control

  • Load holding circuit check

• CAIG.LGN (Vented Counterbalance Valve) :

  • Load control and run-away prevention for excavator booms, arms, and buckets

  • Overrunning load control for cranes and lifting platforms

  • Hydraulic motor braking and load holding for mobile machinery

  • Systems with significant return line backpressure

• CRIB.XCN (Pilot-to-Open Check Valve) :

  • High-pressure load holding and anti-drifting

  • Accumulator isolation and charging control

  • Hydraulic cylinder position locking

  • Hose burst protection

Expert Maintenance Tips

1. Verify Model and Cavity Compatibility Prior to Installation

All models are screw-in cartridge valves. Confirm that the manifold cavity matches the valve – CXJA.XDN requires T-18A cavity, while CAIG.LGN and CRIB.XCN require T-19A cavity. Different cavity sizes are not interchangeable.

2. Correct Installation Torque

Recommended installation torque for each model:

• CXJA.XDN: 474 – 508 Nm (350 – 375 lbf·ft)

• CAIG.LGN: 61 – 68 Nm (45 – 50 lbf·ft)

• CRIB.XCN: Refer to Sun Hydraulics technical manual

3. Seal Material Selection

All models offer multiple seal options:

• Buna-N (Nitrile) : Standard configuration, suitable for mineral-based hydraulic oils

• Viton (Fluorocarbon) : Suitable for high temperatures and various hydraulic fluids

• EPDM: For phosphate ester fluids only – exposure to petroleum-based hydraulic oils or lubricating greases will damage the seals

4. CAIG.LGN Pressure Setting Precautions

CAIG.LGN counterbalance valves should be set to at least 1.3 times the maximum load-induced pressure. Turn the adjustment clockwise to decrease the setting and release the load. Full clockwise setting is 200 psi (14 bar) . Note: Clockwise rotation decreases the setting – opposite to common relief valves.

5. System Cleanliness Management

Although Sun Hydraulics products offer excellent contamination tolerance, recommended system cleanliness is ISO 4406 Code 18/16/13 or better. CAIG.LGN and CRIB.XCN have tighter internal clearances and require higher cleanliness levels.

6. Periodic Functional Checks

Perform functional checks every 2,000 operating hours or annually:

• CXJA.XDN: Verify check function in both directions and leakage

• CAIG.LGN: Verify load holding reliability, pilot control sensitivity, and leakage within specification

• CRIB.XCN: Verify pilot-open function and leakage

If abnormalities are observed, arrange for servicing or replacement.