CBIA-LIV COUNTERBALANCE VALVE SUN HYDRAULICS

CBIA-LIV COUNTERBALANCE VALVE SUN HYDRAULICS
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.

FEATURES

• Counterbalance valves should be set at least 1.3 times the maximum load induced pressure.
• Turn adjustment clockwise to decrease setting and release load.
• Full clockwise setting is less than 200 psi (14 bar).
• 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.
• This valve has positive seals between all ports.

SPECIFICATIONS:

• Cavity T-19A
• Series 4
• Capacity 120 gpm
• Pilot Ratio 3:1
• Maximum Recommended Load Pressure at Maximum Setting 3075 psi
• Maximum Setting 4000 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 Standard
• Reseat >85% of setting
• Valve Hex Size 1 5/8 in.
• Valve Installation Torque 350 – 375 lbf ft
• Adjustment Screw Internal Hex Size 7/32 in.
• Locknut Hex Size 3/4 in.
• Locknut Torque 25 – 30 lbf ft
• Model Weight 2.98 lb.
• Seal kit – Cartridge Buna: 990019007
• Seal kit – Cartridge Polyurethane: 990019002
• Seal kit – Cartridge Viton: 990019006