SUN Hydraulics CBFD-LJN Counterbalance Valve Screw Adjustment 140-350 Bar 1.7 Bar Check

SUN Hydraulics CBFD-LJN Counterbalance Valve Screw Adjustment 140-350 Bar 1.7 Bar Check

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SUN Hydraulics CBFD-LJN
Counterbalance Valve


Sun Hydraulics has established a strong foundation for consistently delivering exceptional performance in all aspects of their business. From product design and service delivery, Sun Hydraulics stands out in the industry.

Since the beginning, Sun products have been setting the standard for the screw-in hydraulic cartridge valve industry. Sun's floating cartridge construction and cavity design approach allows products to operate precisely and reliably at higher pressures and flow rates in the most demanding applications. The generous porting area, coupled with our manifold design and construction techniques, result in integrated packages that can be up to 50% smaller than competitive offerings.

Sun cartridge valves are offered in five primary sizes, with flow capacity and controlled horsepower doubling with each successive size. Within each broad functional area (pressure, flow, load control, etc.), multiple variations are available to help you optimize your control circuit, from individual valves to complete integrated packages. Their expansive product line allows you to develop the best control solution for your hydraulic application.

Counterbalance valves with pilot assist are meant to control an overrunning load. The check valve allows 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. Pilot assist at port 3 lowers the effective setting of the relief valve at a rate determined by the pilot ratio.


Technical Specification

Control - Standard Screw Adjustment
Functional Setting Range - 140-350 Bar / 2000-5000 PSI With 1.7 Bar / 25 PSI Check, 210 Bar / 3000 PSI Standard Setting
Seal Material - Buna-N

Cavity T-17A
Series 3
Capacity 40 gpm
Pilot Ratio 4.5:1
Maximum Recommended Load Pressure at Maximum Setting 3850 psi
Maximum Setting 5000 psi
Factory Pressure Settings Established at 2 in³/min.
Maximum Valve Leakage at Reseat 5 drops/min.
Adjustment - No. of CCW Turns from Min. to Max. Setting 3.75
Operating Characteristic Semi-restrictive
Reseat >85% of setting
Valve Hex Size 1 1/4 in.
Valve Installation Torque 150 - 160 lbf ft
Adjustment Screw Internal Hex Size 5/32 in.
Locknut Hex Size 9/16 in.
Locknut Torque 80 - 90 lbf in.
Model Weight 0.62 Kg
Seal kit - Cartridge Buna: 990017007
Seal kit - Cartridge Polyurethane: 990017002
Seal kit - Cartridge Viton: 990017006

*Note: Data may vary by configuration.

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The purchaser of these items must ensure that they are satisfactory for use in the application for which they are intended.
No responsibility can be accepted if any products are incorrectly or inadequately fitted.
Goods may not be exact to image shown.