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SUN HYDRAULICS
CBFALAV

  • SUN HYDRAULICS
  • Material:CBFALAV
  • Model:CBFA-LAV
  • Summary:Cartridge

Due to extremely high demand, please call 888-905-7411 for availability

***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 CBFALAV (CBFALAV) is designed as a counterbalance valve with pilot assist, primarily used to control overrunning loads in hydraulic systems. This model enables free flow from the directional valve port 2 to the load port 1 through a check valve, while controlling flow from port 1 to port 2 via a direct-acting, pilot-assisted relief valve. The pilot assist at port 3 modifies the relief valve's effective setting based on the pilot ratio. This valve features two check valve cracking pressures, with a standard recommendation of 25 psi unless actuator cavitation is a concern. It incorporates Sun’s floating style construction which minimizes potential internal parts binding that could result from excessive installation torque or variations in cavity/cartridge machining. The design ensures positive seals between all ports and maintains interchangeability among all 3-port counterbalance, load control, and pilot-to-open check cartridges for given frame sizes. With an operational capacity of up to 15 gpm (60 L/min) and maximum settings reaching up to 4000 psi (280 bar), the CBFALAV is robust for various applications. It also features adjustable settings with a maximum recommended load pressure at its highest setting of 3075 psi (215 bar). Additionally, it provides reliable performance under different conditions with backpressure at port 2 contributing to the effective relief setting in proportion to the pilot ratio. Installation specifications include an adjustment number of counterclockwise turns (3.75) to increase setting and an installation torque between 150-160 lbf ft (203-217 Nm). The model weighs approximately 1.60 lb (0.70 kg) and utilizes Viton seals for enhanced durability and performance under varying environmental conditions.

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.

Other names for this valve include motion control valve and over center valve.

  • Counterbalance valves should be set at least 1.3 times the maximum load induced pressure.
  • Restrictive valves have no relief capacity other than as a thermal relief.
  • Turn adjustment clockwise to decrease setting and release load.
  • Full clockwise setting is less than 200 psi (14 bar).
  • Backpressure at port 2 adds to the effective relief setting at a ratio of 1 plus the pilot ratio times the backpressure.
  • Reseat exceeds 85% of set pressure when the valve is standard set. Settings lower than the standard set pressure may result in lower reseat percentages.
  • Sun counterbalance cartridges can be installed directly into a cavity machined in an actuator housing for added protection and improved stiffness in the circuit.
  • Two check valve cracking pressures are available. Use the 25 psi (1,7 bar) check unless actuator cavitation is a concern.
  • This valve has positive seals between all ports.
  • All 3-port counterbalance, load control, and pilot-to-open check cartridges are physically interchangeable (i.e. same flow path, same cavity for a given frame size).
  • 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-17A
Series 3
Capacity 15 gpm60 L/min.
Pilot Ratio 3:13:1
Maximum Recommended Load Pressure at Maximum Setting 3075 psi215 bar
Maximum Setting 4000 psi280 bar
Factory Pressure Settings Established at 2 in³/min.30 cc/min.
Maximum Valve Leakage at Reseat 5 drops/min.0,3 cc/min.
Adjustment - Number of Counterclockwise Turns to Increase Setting 3.753.75
Operating Characteristic RestrictiveRestrictive
Reseat >85% of setting>85% of setting
Valve Hex Size 1 1/4 in.31,8 mm
Valve Installation Torque 150 - 160 lbf ft203 - 217 Nm
Adjustment Screw Internal Hex Size 5/32 in.4 mm
Locknut Hex Size 9/16 in.15 mm
Locknut Torque 80 - 90 lbf in.9 - 10 Nm
Model Weight 1.60 lb0,70 kg
Seal kit - Cartridge Viton: 990-017-006

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