Dual counterbalance assembly with cross-port relief and shuttle
|B, B/S||Ports V1 & V2: 3/8" NPTF; Port S: SAE 4;|
|C, C/S||Ports V1 & V2: 1/2" NPTF; Port S: SAE 4;|
|J, J/S||Ports V1 & V2: SAE 8; Port S: SAE 4;|
|K, K/S||Ports V1 & V2: SAE 10; Port S: SAE 4;|
|U, U/S||Ports V1 & V2: 3/8" BSPP; Port S: 1/4" BSPP;|
|V, V/S||Ports V1 & V2: 1/2" BSPP; Port S: 1/4" BSPP;|
This assembly provides 3 functions, a) dual cross-pilot load holding between motor ports M1 and M2, b) cross-port relief protection between ports M1 and M2 and c) load-sense shuttle between valve ports V1 and V2.
- Counterbalance valves should be set at least 1.3 times the maximum load induced pressure.
- Turn adjustment clockwise to decrease setting of the counterbalance valve and release load.
- Backpressure at port 2 of the counterbalance valve adds to the effective relief setting at a ratio of 1 plus the pilot ratio times the backpressure.
- Counterbalance valve 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.
- The assembly's cross-ported direct acting relief valves exhibit rapid response characteristics that minimize pressure overshoot and also provide low reseat leakage (less than 5 drops/min (0,3 cc/min) @ 85% of cracking pressure).
- Hydraulic motors leak. Therefore a mechanical brake is recommended to positively lock any stopped live load.
|Body Type||Motor mountMotor mount|
|Interface||Eaton/Char-Lynn H & SEaton/Char-Lynn H & S|
|Capacity||15 gpm60 L/min.|
There are exactly 250 Sun drops in a cubic inch or 15 in a cc.
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.
- 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.
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