Electro-proportional controlled cushion lock assembly

Function

Function for XCCL
Port Designators [ + ]
Modifiers Ports
I, I/S Ports A, B, P, T: SAE 6; Mtg Holes: .312 - 18UNC x .56 DP;
U, U/S Ports A, B, P, T: 3/8" BSPP; Mtg Holes: M8 x 1.25-6H x .56 DP;
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Technical Features [ + ]

This valve assembly provides independent, proportional meter-in speed control for ports A and B, overrunning load control, and load-port relief protection. It also supplies make-up oil and flushes hot dirty oil out of the actuator. All oil coming out of the actuator returns to tank through port T.

  • The counterbalance valves should be set at 1.3 times the maximum load induced pressure.
  • The term cushion in the name Cushion Lock is a misnomer. Because the counterbalance valves play a dual role as load controls and work port reliefs they must be set too high to provide any real cushion. Deceleration can only be achieved by ramping down the input flow.
  • This assembly is ideal for applications with long lines to the actuators. Mounting the assembly close to an actuator ensures that cool, clean oil will be supplied to the actuator and that the hot, dirty oil will go out the T port to the tank
  • Low pilot ratio counterbalance valves (3:1 vrs 10:1) may be necessary to generate enough pressure to release a brake.
  • Hydraulic motors leak. Therefore a mechanical brake is recommended to positively lock any stopped live load.
  • Includes mounting threads 8-32 UNC-2B x .28 (7 mm) deep for optional XMD driver. When not configured with cartridge, the XMD driver must be purchased separately. A harness will be required.
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Technical Data [ + ]
Body Type Line mountLine mount
Capacity 9 gpm34 L/min.
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FAQs [ + ]
How big is a drop of hydraulic oil?  

There are exactly 250 Sun drops in a cubic inch or 15 in a cc.

Why doesn't Sun anodize their aluminum bodies?

Reasons to anodize:

  • To increase corrosion resistance. Sun uses 6061-T651 aluminum. It is one of the most corrosion resistant aluminum alloys there is. Whether or not anodizing improves the corrosion resistance of 6061 aluminum is debatable. We have yet to have a manifold returned because of corrosion.
  • Appearance (color). The 2 colors that would appeal to Sun would be blue or black. Unfortunately these are the colors that are hardest to do consistently.
  • To provide a hard wear surface. Sun does not make parts-in-body valves. The manifold is just plumbing. We don't need a wear surface.
  • Because everyone else does it. Bad reason. 

Reasons to not anodize:

  • Cost. It's another process.
  • Logistics. When you make tens of thousands of manifolds a month and you anodize hundreds, it's a problem. Consistency. See above.
  • Stamping. After a body is anodized you cannot do any more stamping without making a mess.
    Inspection. Have you ever tried to look for burrs in a black anodized body? It's the old blackboard factory at night scenario.
  • Torque. You will experience an increase in breakaway torque when removing items from an anodized manifold.
  • Fatigue life. This is the best reason to not anodize. Fatigue failure is a very complex phenomenon. What it takes to initiate a crack is difficult to predict. What it takes to propagate a crack is readily defined. Anodizing produces a very thin, very hard, and very brittle surface on aluminum. The first time you pressurize an anodized aluminum manifold you have initiated fatigue cracks. Whether or not the stress is enough to propagate the cracks is a matter of pressure and manifold geometry. Anodizing an aluminum manifold grossly reduces the fatigue life by anywhere from 20% to 50%.
Direct acting or pilot operated - what do I use?

Direct-acting valves are used to prevent over pressure, and pilot-operated valves are used to regulate pressure. If you are unsure, use a direct-acting valve. Sun's direct acting valves are very fast, dirt tolerant, stable, and robust. Sun's pilot-operated valves are moderately fast, they have a low pressure rise vs. flow curve, and they are easy to adjust.

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Notes [ + ]
  • When configured with the XMD driver, a wiring harness is required to connect the XMD to the system and must be purchased separately. Sun offers a selection of harnesses and are available under Electronics | I/O Modules | Accessories.
  • 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.
  • For detailed information regarding the cartridges contained in this assembly, click on the models codes shown in the Included Components tab.
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Additional Resources [ + ]
Highlights
Technical Tips
Technical Information
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Coil Information [ + ]

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