3:1 pilot ratio, restrictive counterbalance valve assembly

Symbols

Port Headings and Sizes [ + ]
Modifiers Ports
ECV, /10, /11, /S, /S3 Ports 1 & 2: 1/2" BSPP; Port 3: 1/4" BSPP;
Cartridge Technical Features [ + ]

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.
  • 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).
  • 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.
  • Corrosion-resistant cartridge valves are intended for use in corrosive environments and are identified by the model code suffix /AP for external stainless steel components, or /LH for external zinc-nickel plated components. See the CONFIGURATION section for all options. For further details, please see the Materials of Construction page located under TECH RESOURCES.
  • 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.
Cartridge Technical Data [ + ]
Note: Data may vary by configuration. See CONFIGURATION section.
Cavity T-11A
Series 1
Capacity 5 gpm20 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 - No. of CCW Turns from Min. to Max. Setting 3.753.75
Operating Characteristic RestrictiveRestrictive
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 .40 lb0,20 kg
Seal kit - Cartridge Buna: 990011007
Seal kit - Cartridge Polyurethane: 990011002
Seal kit - Cartridge Viton: 990011006
Manifold Technical Data [ + ]
Body Type Line mountLine mount
Interface NoneNone
Body Features Ninety degreeNinety degree
Mounting Hole Diameter .34 in.8.6 mm
Mounting Hole Depth ThroughThrough
Mounting Hole Quantity 22
Open Cavities 11
Cavity T-11A
Port Size 1/2" BSPP1/2" BSPP
CAD Files [ + ]
Notes [ + ]
  • Important: Carefully consider the maximum system pressure. The pressure rating of the manifold is dependent on the manifold material, with the port type/size a secondary consideration. Manifolds constructed of aluminum are not rated for pressures higher than 3000 psi (210 bar), regardless of the port type/size specified.
Additional Resources [ + ]