SYMBOL
OPERATION
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.
SPECIFICATIONS:
Max.Setting: 350 bar (5000 psi)
Maximum Recommended Load Pressure at Maximum Setting: 270 bar (3850 psi)
Capacity: 10 L/min (2.5 gpm)
Pilot Ratio: 10:1
Pilot Configuration: Sealed
Factory Pressure Settings Established at: 30 cc/min (2 in³/min).
Maximum Valve Leakage at Reseat: 0.3 cc/min (5 drops/min.)
Adjustment - No. of CCW Turns from Min. to Max. Setting: 3.75
Operating Characteristic: Ultra-restrictive
Reseat: >85% of setting
Cavity: T-11A
Valve Installation Torque: 45 - 50 Nm
FEATURES:
* 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.
* 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.
PERFORMANCE:
DIMENSIONS
ORDER CODE:
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