Sun Hydraulics Counterbalance Valve - Vented - Atmospherically Referenced - 3:1 Pilot Ratio - CACALHN

Features
 • Atmospherically vented 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
 • Backpressure at port 2 does not affect the valve setting because the spring chamber is atmospherically referenced
 • 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
 • Turn adjustment clockwise to decrease setting and release load
 • Full clockwise setting is 200 psi (14 bar)
 • Approximately 1 drop (0,07 cc) of fluid will pass from the pilot area to the vented spring chamber every 4000 cycles
 • 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
 • With vented valves, a lower pilot ratio may be required to achieve machine stability compared to non-vented valves
 • Three-port vented valves are atmospherically referenced and considered problem solvers for existing circuits using non-vented valves
 • Over time, the vented valves may leak externally or allow moisture into the spring chamber
 • Four-port vented counterbalance valves are recommended for new applications
 • 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

Specifications

 • Cavity :- T-11A
 • Series :- 1
 • 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.
 • Check Cracking Pressure :- 40 psi2,8 bar
 • Adjustment - No. of CCW Turns from Min. to Max. Setting :- 55
 • Operating Characteristic :- StandardStandard
 • Reseat :- >85% of setting>85% of setting
 • Valve Hex Size :- 7/8 in.22,2 mm
 • Valve Installation Torque :- 30 - 35 lbf ft41 - 47 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 :- 0.44 lb.0.20 kg.
 • Seal kit - Cartridge :- Buna: 990211007
 • Seal kit - Cartridge :- Viton: 990211006

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