SUN HYDRAULICS
COFALJN
$79.32 USD
- SUN HYDRAULICS
- Material:COFALJN
- Model:COFA-LJN
- Summary:Cartridge
Quantity in stock: 0
***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Sun Hydraulics directly.***
The Sun Hydraulics COFALJN (COFALJN) is a spring-biased closed, pilot-to-close check cartridge valve with a nominal pilot ratio of 1.8:1. This valve permits flow from port 1 to port 2 while blocking reverse flow under any condition, ensuring reliable operation in various hydraulic systems. Specifically designed for use in regeneration circuits, the COFALJN features a pilot pressure that opposes the pressure at port 1 at a ratio of 1.8:1, meaning that a pressure of 1000 psi at the pilot port can close the valve against a pressure of 1800 psi at port 1. This cartridge is engineered to prevent any reverse flow from port 2 to port 1 and maintains closure with equal pressures across all ports. The incorporation of Sun's floating style construction minimizes potential internal parts binding due to excessive installation torque or variations in cavity/cartridge machining. This model has been updated from earlier versions to include positive sealing on the pilot pistons, enhancing its reliability and performance consistency. The COFALJN has a maximum operating pressure of 5000 psi and can handle up to 40 gpm (160 L/min) with maximum valve leakage maintained at approximately one drop per minute. It also features specific configurations such as EPDM seals for systems using phosphate ester fluids, though these are sensitive to exposure to petroleum-based fluids. Corrosion-resistant options are available for harsh environments, indicated by model code suffixes AP or LH. Key specifications include a valve hex size of 1-1/8 inches and an installation torque requirement between 45-50 lbf-ft. The unit weighs about .50 lb and is available with Viton seal kits for enhanced durability under various operational conditions.
The Sun Hydraulics COFALJN (COFALJN) is a spring-biased closed, pilot-to-close check cartridge valve with a nominal pilot ratio of 1.8:1. This valve permits flow from port 1 to port 2 while blocking reverse flow under any condition, ensuring reliable operation in various hydraulic systems. Specifically designed for use in regeneration circuits, the COFALJN features a pilot pressure that opposes the pressure at port 1 at a ratio of 1.8:1, meaning that a pressure of 1000 psi at the pilot port can close the valve against a pressure of 1800 psi at port 1. This cartridge is engineered to prevent any reverse flow from port 2 to port 1 and maintains closure with equal pressures across all ports. The incorporation of Sun's floating style construction minimizes potential internal parts binding due to excessive installation torque or variations in cavity/cartridge machining. This model has been updated from earlier versions to include positive sealing on the pilot pistons, enhancing its reliability and performance consistency. The COFALJN has a maximum operating pressure of 5000 psi and can handle up to 40 gpm (160 L/min) with maximum valve leakage maintained at approximately one drop per minute. It also features specific configurations such as EPDM seals for systems using phosphate ester fluids, though these are sensitive to exposure to petroleum-based fluids. Corrosion-resistant options are available for harsh environments, indicated by model code suffixes AP or LH. Key specifications include a valve hex size of 1-1/8 inches and an installation torque requirement between 45-50 lbf-ft. The unit weighs about .50 lb and is available with Viton seal kits for enhanced durability under various operational conditions.
This valve is a spring biased closed, pilot-to-close check cartridge that has a 1.8:1 pilot ratio. The valve allows flow from port 1 to port 2 and blocks reverse flow. Pressure at the pilot port opposes pressure at port 1 at a ratio of 1.8:1. This valve is most often used in regeneration circuits.
- Nominal pilot ratio is 1.8:1. This means that a pressure of 1000 psi (70 bar) at the pilot port will close a valve against a pressure of 1800 psi (125 bar) at port 1. Any decay or loss of pilot pressure could allow the valve to open, even if it is a momentary decay or loss.
- Pressure at the port 2 area directly opposes pilot pressure.
- Reverse flow through the valve from port 2 to port 1 is not possible under any condition.
- With equal pressures at all ports the valve is closed.
- In the begining the CO*A's did not have a positive seal on the pilot pistons and the CO*B's did. Now the CO*A's are positively sealed and the 2 valves are mechanically identical. CO*A's are more readily available and cost less.
- Cartridges configured with EPDM seals are for use in systems with phosphate ester fluids. Exposure to petroleum based fluids, greases and lubricants will damage the seals.
- Corrosion resistant cartridge valves are intended for use in corrosive environments and are identified by the model code suffix /AP or /LH (see CONFIGURATION section). For further details, please see the Materials of Construction page under TECHNICAL RESOURCES.
- Incorporates the Sun floating style construction to minimize the possibility of internal parts binding due to excessive installation torque and/or cavity/cartridge machining variations.
| Cavity | T-2A |
| Series | 2 |
| Capacity | 40 gpm160 L/min. |
| Pilot Ratio | 1.8:11.8:1 |
| Maximum Operating Pressure | 5000 psi350 bar |
| Maximum Valve Leakage at 110 SUS (24 cSt) | 1 drops/min.0,07 cc/min. |
| Valve Hex Size | 1 1/8 in.28,6 mm |
| Valve Installation Torque | 45 - 50 lbf ft61 - 68 Nm |
| Model Weight | .50 lb0,25 kg |
| Seal kit - Cartridge | Viton: 990-202-006 |
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