NCBB-LCN Sun Hydraulics Needle Valve Reverse Flow Check 350 bar 20 L/min

Series Overview

The NCBB, NCCB, and NCEB series are fully adjustable needle valves with reverse flow check manufactured by Sun Hydraulics (USA). These are screw-in cartridge-type flow control valves. They are non-pressure compensated throttling valves that provide stepless flow regulation through a precision needle valve adjustment mechanism.

Core design features of this series:

• Fully adjustable needle valve: Infinitely adjustable from fully closed to maximum orifice diameter

• Integrated high-capacity reverse flow check: Provides unrestricted flow from port 2 to port 1

• Sharp-edged orifice design: Minimizes flow variations due to viscosity changes

• Sun’s floating cartridge construction: Compensates for cavity machining tolerances and excessive installation torque

Key differences between models (listed):

• NCBB-LCN: Cavity T-162A, capacity 20 L/min (5 gpm), orifice 4.0 mm, Series 0

• NCCB-LAN: Cavity T-13A, capacity 28 L/min (7 gpm), orifice 4.8 mm, Series 1

• NCCB-LCN: Cavity T-13A, capacity 28 L/min (7 gpm), orifice 4.8 mm, Series 1

• NCEB-LCN: Cavity T-5A, capacity 45 L/min (12 gpm), orifice 6.4 mm

• NCEB-LAN: Cavity T-5A, capacity 45 L/min (12 gpm), orifice 6.4 mm

All SUN series cartridge valves supplied are genuine Sun Hydraulics original products, ensuring 100% interchangeability with original equipment. Every unit undergoes rigorous application-specific simulation testing prior to shipment to guarantee optimal performance in your actual operating conditions.

Model 1: NCBB-LCN

Product Overview

The NCBB-LCN is a fully adjustable needle valve with reverse flow check from Sun Hydraulics, utilizing the T-162A standard cavity. This non-pressure compensated throttling valve provides stepless flow regulation through a precision needle valve adjustment mechanism—infinitely adjustable from fully closed to maximum orifice diameter. An integrated high-capacity check valve provides unrestricted flow from port 2 to port 1. The NCBB-LCN is ideal for hydraulic systems requiring precision flow regulation with reverse free flow capability.

Technical Specifications (Bulleted List)

• Model: NCBB-LCN

• Valve Type: Fully Adjustable Needle Valve with Reverse Flow Check

• Cavity: T-162A

• Series: 0

• Capacity: 20 L/min / 5 gpm

• Orifice Diameter: 4.0 mm

• Max. Operating Pressure: 350 bar / 5000 psi

• Max. Leakage (at 24 cSt): 0.7 cc/min / 10 drops/min

• Adjustment Turns (Closed to Open): 55 turns CCW

• Valve Hex Size: 19.1 mm / 3/4″

• Valve Installation Torque: 27 – 33 Nm

• Adjustment Screw Hex Size: 4 mm / 5/32″

• Locknut Hex Size: 15 mm / 9/16″

• Locknut Torque: 9 – 10 Nm

• Weight: 0.10 kg

• Seal Kits: Buna: 990162007 / Viton: 990162006 / Polyurethane: 990162002

Key Technical Advantages

1. Precision Stepless Flow Regulation: The NCBB-LCN employs a precision needle valve adjustment mechanism providing stepless, infinite adjustment from fully closed to maximum orifice diameter. The 55-turn adjustment range delivers extremely high resolution for precision flow control applications.

2. Integrated High-Capacity Reverse Flow Check: An integrated high-capacity check valve provides unrestricted flow from port 2 to port 1. This design enables a single valve to perform both forward throttling and reverse free flow functions, simplifying hydraulic circuit design.

3. Sharp-Edged Orifice Design: The sharp-edged orifice design minimizes flow variations due to viscosity changes. This ensures relatively stable flow control accuracy even under conditions where oil temperature variations cause viscosity fluctuations.

4. Sun’s Floating Cartridge Construction: Sun’s patented floating cartridge construction compensates for cavity machining tolerances and excessive installation torque. This ensures precise spool positioning within the cavity, preventing spool sticking or seal failure caused by installation stress.

5. Pressure Compensated Adjustment Mechanism: The adjustment mechanism features pressure compensated design, allowing easy adjustment even under high-pressure conditions.

Application Areas

• Hydraulic actuator speed control (cylinder feed rate, motor speed regulation)

• Hydraulic clamping and tooling system precision flow regulation

• Machine tool hydraulic system throttling and speed control

• Test equipment and test bench flow control

• Lubrication system flow rate regulation

Expert Maintenance Tips

• The NCBB-LCN utilizes the T-162A standard cavity. Verify cavity machining conforms to Sun Hydraulics T-162A cavity specifications before installation.

• Valve installation torque is 27 – 33 Nm. Use a torque wrench for proper installation—avoid over-tightening which may damage the valve body or affect floating construction performance.

• This is a non-pressure compensated throttling valve—flow through the valve is proportional to the square root of the pressure differential across ports 1 and 2. Consider load variation effects on flow stability during system design.

• System fluid cleanliness should meet ISO 4406 standard 19/17/14 or better.

• Seal material options include Buna-N (standard), Viton (high-temperature resistant), and Polyurethane. Verify seal compatibility with hydraulic fluid type and operating temperature.

Model 2: NCCB-LAN

Product Overview

The NCCB-LAN is a fully adjustable needle valve with reverse flow check from Sun Hydraulics, utilizing the T-13A standard cavity. This non-pressure compensated throttling valve has a capacity of 28 L/min (7 gpm) . The NCCB-LAN provides stepless flow regulation through a precision needle valve adjustment mechanism, with an integrated high-capacity check valve providing unrestricted flow from port 2 to port 1. The reverse flow check valve cracking pressure is 0.3 bar (4 psi) .

Technical Specifications (Bulleted List)

• Model: NCCB-LAN

• Valve Type: Fully Adjustable Needle Valve with Reverse Flow Check

• Cavity: T-13A

• Series: 1

• Capacity: 28 L/min / 7 gpm

• Orifice Diameter: 4.8 mm

• Max. Operating Pressure: 350 bar / 5000 psi

• Max. Leakage (at 24 cSt): 10 drops/min

• Reverse Flow Check Cracking Pressure: 0.3 bar / 4 psi

• Adjustment Turns (Closed to Open): 5 turns CCW

• Valve Hex Size: 22.2 mm / 7/8″

• Valve Installation Torque: 41 – 47 Nm

• Adjustment Screw Hex Size: 4 mm / 5/32″

• Locknut Hex Size: 15 mm / 9/16″

• Locknut Torque: 9 – 10 Nm

• Weight: 0.15 kg

• Seal Kits: Buna: 990010007 / Viton: 990010006 / EPDM: 990010014 / Polyurethane: 990010002

Key Technical Advantages

1. Higher Flow Capacity: The NCCB-LAN offers 28 L/min (7 gpm) capacity with 4.8 mm orifice diameter. This meets the throttling requirements of higher-flow hydraulic systems compared to the NCBB-LCN (20 L/min).

2. Precision Stepless Flow Regulation: Precision needle valve adjustment mechanism provides stepless, infinite adjustment from fully closed to maximum orifice diameter. The 5-turn adjustment range delivers precise flow control.

3. Integrated Reverse Flow Check: Integrated high-capacity check valve provides unrestricted flow from port 2 to port 1. The check valve cracking pressure is only 0.3 bar (4 psi) , ensuring minimal pressure loss during reverse flow.

4. Sun’s Floating Cartridge Construction: Sun’s patented floating cartridge construction compensates for cavity machining tolerances and excessive installation torque. This ensures precise spool positioning and long-term reliable operation.

5. Multiple Seal Options: Available with Buna-N, Viton, EPDM, and Polyurethane seal options. EPDM seals are specifically suitable for phosphate ester hydraulic fluid systems.

Application Areas

• Medium-flow hydraulic system actuator speed control

• Hydraulic manifold throttling and flow distribution

• Industrial hydraulic power unit branch flow regulation

• Mobile hydraulic equipment flow control

• Hydraulic circuits requiring reverse free flow

Expert Maintenance Tips

• The NCCB-LAN utilizes the T-13A standard cavity. Verify cavity machining conforms to Sun Hydraulics T-13A cavity specifications before installation.

• Valve installation torque is 41 – 47 Nm. Use a torque wrench for proper installation.

• This is a non-pressure compensated throttling valve—flow is proportional to the square root of the pressure differential across ports 1 and 2. Consider load variation effects on flow stability during system design.

• When using EPDM seals, avoid exposure to petroleum-based hydraulic fluids or greases, which will damage the seals.

• Always tighten the locknut (torque 9 – 10 Nm) after adjustment to prevent set point drift due to vibration.

Model 3: NCCB-LCN

Product Overview

The NCCB-LCN is a fully adjustable needle valve with reverse flow check from Sun Hydraulics, utilizing the T-13A standard cavity. This non-pressure compensated throttling valve has a capacity of 28 L/min (7 gpm) . The primary difference between NCCB-LCN and NCCB-LAN is the adjustment type—LCN features standard screw adjustment, while LAN features adjustable with locknut and scale. The NCCB-LCN provides stepless flow regulation through a precision needle valve adjustment mechanism.

Technical Specifications (Bulleted List)

• Model: NCCB-LCN

• Valve Type: Fully Adjustable Needle Valve with Reverse Flow Check

• Cavity: T-13A

• Series: 1

• Capacity: 28 L/min / 7 gpm

• Orifice Diameter: 4.8 mm

• Max. Operating Pressure: 350 bar

• Max. Leakage (at 24 cSt): 0.7 cc/min

• Adjustment Turns (Closed to Open): 5 turns CCW

• Valve Hex Size: 22.2 mm

• Valve Installation Torque: 41 – 47 Nm

• Adjustment Screw Hex Size: 4 mm

• Locknut Hex Size: 15 mm

• Locknut Torque: 9 – 10 Nm

• Weight: 0.14 kg

• Seal Kits: Buna: 990010007 / Viton: 990010006 / EPDM: 990010014 / Polyurethane: 990010002

Key Technical Advantages

1. Standard Screw Adjustment, Cost-Effective: The NCCB-LCN features standard screw adjustment. Compared to the scaled adjustment version (LAN), the LCN version offers a more cost-effective solution while maintaining the same performance.

2. Precision Stepless Flow Regulation: Precision needle valve adjustment mechanism provides stepless, infinite adjustment from fully closed to maximum orifice diameter. The 5-turn adjustment range delivers precise flow control.

3. Sharp-Edged Orifice Design: The sharp-edged orifice design minimizes flow variations due to viscosity changes. This ensures relatively stable flow control accuracy even under conditions where oil temperature variations cause viscosity fluctuations.

4. Sun’s Floating Cartridge Construction: Sun’s patented floating cartridge construction compensates for cavity machining tolerances and excessive installation torque. This ensures precise spool positioning and long-term reliable operation.

5. 2-Port Flow Control Valve Interchangeability: All 2-port flow control valves are physically and functionally interchangeable—same flow path, same cavity. This greatly simplifies spare parts management and field replacement.

Application Areas

• Medium-flow hydraulic system actuator speed control

• Hydraulic manifold throttling and flow distribution

• Industrial hydraulic power unit branch flow regulation

• Cost-effective hydraulic systems requiring standard screw adjustment

• Hydraulic circuits requiring reverse free flow

Expert Maintenance Tips

• The NCCB-LCN utilizes the T-13A standard cavity. Verify cavity machining conforms to Sun Hydraulics T-13A cavity specifications before installation.

• Valve installation torque is 41 – 47 Nm. Use a torque wrench for proper installation.

• This is a non-pressure compensated throttling valve—flow is proportional to the square root of the pressure differential across ports 1 and 2. Consider load variation effects on flow stability during system design.

• Always tighten the locknut (torque 9 – 10 Nm) after adjustment to prevent set point drift due to vibration.

• When using EPDM seals, avoid exposure to petroleum-based hydraulic fluids or greases.

Model 4: NCEB-LCN

Product Overview

The NCEB-LCN is a high-flow model in the Sun Hydraulics fully adjustable needle valve with reverse flow check series, utilizing the T-5A standard cavity. This non-pressure compensated throttling valve has a capacity of 45 L/min (12 gpm) with 6.4 mm orifice diameter. The NCEB-LCN provides stepless flow regulation through a precision needle valve adjustment mechanism, with an integrated high-capacity check valve providing unrestricted flow from port 2 to port 1. This model is ideal for hydraulic systems requiring high-flow precision throttling.

Technical Specifications (Bulleted List)

• Model: NCEB-LCN

• Valve Type: Fully Adjustable Needle Valve with Reverse Flow Check

• Cavity: T-5A

• Capacity: 45 L/min / 12 gpm

• Orifice Diameter: 6.4 mm

• Max. Operating Pressure: 350 bar / 5000 psi

• Max. Leakage (at 24 cSt): 10 drops/min

• Recommended Viscosity: 8 – 380 cSt

• Valve Installation Torque: 61 – 68 Nm

• Weight: Approx. 0.27 kg

Key Technical Advantages

1. High Flow Capacity: The NCEB-LCN offers 45 L/min (12 gpm) capacity with 6.4 mm orifice diameter. This meets the throttling requirements of high-flow hydraulic systems, significantly exceeding the NCBB (20 L/min) and NCCB (28 L/min) series.

2. Precision Stepless Flow Regulation: Precision needle valve adjustment mechanism provides stepless, infinite adjustment from fully closed to maximum orifice diameter. Maintains precise flow control even under high-flow conditions.

3. Sharp-Edged Orifice Design: The sharp-edged orifice design minimizes flow variations due to viscosity changes. This ensures relatively stable flow control accuracy even under conditions where oil temperature variations cause viscosity fluctuations.

4. Broad Viscosity Compatibility: Recommended viscosity range 8 – 380 cSt. This broad viscosity compatibility enables the NCEB-LCN to handle diverse media from low-viscosity hydraulic fluids to high-viscosity lubricating oils.

5. T-5A Standard Cavity, Wide Compatibility: T-5A is an industry-standard cavity. The NCEB-LCN serves as a direct drop-in upgrade for legacy needle valves across hundreds of OEM manifold designs.

Application Areas

• High-flow hydraulic system actuator speed control

• Large industrial hydraulic power unit flow regulation

• Construction machinery hydraulic system high-flow throttling control

• Test equipment and test bench high-flow control

• High-viscosity media lubrication system flow regulation

Expert Maintenance Tips

• The NCEB-LCN utilizes the T-5A standard cavity. Verify cavity machining conforms to Sun Hydraulics T-5A cavity specifications before installation.

• Valve installation torque is 61 – 68 Nm. High-flow models require higher installation torque—use a torque wrench for proper installation.

• System fluid cleanliness should meet ISO 4406 standard 19/17/14 or better.

• This is a non-pressure compensated throttling valve—flow is proportional to the square root of the pressure differential across ports 1 and 2. Load variation effects on flow stability are more significant in high-flow systems—consider this thoroughly during system design.

• Always tighten the locknut after adjustment to prevent set point drift due to vibration.

Model 5: NCEB-LAN

Product Overview

The NCEB-LAN is a high-flow model with scaled adjustment in the Sun Hydraulics fully adjustable needle valve with reverse flow check series, utilizing the T-5A standard cavity. This non-pressure compensated throttling valve has a capacity of 45 L/min (12 gpm) with 6.4 mm orifice diameter. The primary difference between NCEB-LAN and NCEB-LCN is the adjustment type—LAN features adjustable with locknut and scale, enabling precise recording and repeatable setting of flow values. The NCEB-LAN provides stepless flow regulation through a precision needle valve adjustment mechanism.

Technical Specifications (Bulleted List)

• Model: NCEB-LAN

• Valve Type: Fully Adjustable Needle Valve with Reverse Flow Check

• Cavity: T-5A

• Capacity: 45 L/min / 12 gpm

• Orifice Diameter: 6.4 mm

• Max. Operating Pressure: 350 bar / 5000 psi

• Max. Leakage (at 24 cSt): 10 drops/min

• Recommended Viscosity: 2.8 – 380 cSt

• Max. Fluid Temperature: +110°C

• Valve Installation Torque: 61 – 68 Nm

• Weight: 0.27 kg

Key Technical Advantages

1. Scaled Adjustment for Precise Positioning: The NCEB-LAN features scaled adjustment. Scale markings enable operators to precisely record and repeat specific flow settings, significantly improving commissioning efficiency and operational consistency.

2. High Flow Capacity: Capacity of 45 L/min (12 gpm) with 6.4 mm orifice diameter. Meets the precision throttling requirements of high-flow hydraulic systems.

3. Broad Temperature and Viscosity Compatibility: Recommended viscosity range 2.8 – 380 cSt, with maximum fluid temperature up to +110°C. This broad temperature-viscosity compatibility enables the NCEB-LAN to handle demanding conditions including high temperature and high viscosity.

4. Precision Stepless Flow Regulation: Precision needle valve adjustment mechanism provides stepless, infinite adjustment from fully closed to maximum orifice diameter. Scaled design enables more precise and traceable adjustment.

5. Sun’s Floating Cartridge Construction: Sun’s patented floating cartridge construction compensates for cavity machining tolerances and excessive installation torque. This ensures precise spool positioning and long-term reliable operation.

Application Areas

• High-flow hydraulic systems requiring frequent adjustment and repeatable flow settings

• Test equipment and test bench high-flow precision control

• Applications requiring precise recording of flow set points in production processes

• Large industrial hydraulic power unit flow regulation

• High-temperature hydraulic system flow control

Expert Maintenance Tips

• The NCEB-LAN utilizes the T-5A standard cavity. Verify cavity machining conforms to Sun Hydraulics T-5A cavity specifications before installation.

• Valve installation torque is 61 – 68 Nm. Use a torque wrench for proper installation.

• Scaled adjustment design facilitates precise recording of set points—record scale positions after commissioning for future maintenance and troubleshooting reference.

• Maximum fluid temperature is +110°C. For high-temperature applications, verify seal material (Viton recommended) is compatible with operating temperature.

• Always tighten the locknut after adjustment to prevent set point drift due to vibration.