 | |
| Illustration 1 | g00467098 |
Shuttle valve (A) Inlet port (B) Inlet port (C) Outlet port (1) Chamber (2) Chamber (3) Passage (4) Shuttle valve ball | |
 | |
| Illustration 2 | g00467104 |
Location of shuttle valves (5) Shuttle valve (6) Shuttle valve (7) Shuttle valve | |
Shuttle valves are used in the boom and hook control valve which is located below the floorplate in the operator's compartment. These valves are used to resolve the highest pilot signal that is produced during a given operation. The shuttle valve compares the two inlet pressures and the highest pressure is felt at the output.
Inlet pressures enter through ports (A) and (B) . This oil applies pressure to shuttle valve ball (4) . Inlet pressure also enters through port (B) . This oil fills chamber (1) . This also applies pressure to shuttle valve ball (4) . If the pressure from port (A) is greater, then ball (4) moves upward and the oil from port (A) fills passage (3) . This oil travels to chamber (2) and the oil exits the valve through port (C) . If the pressure in chamber (1) is greater, then ball (4) moves downward and this oil is allowed to exit through passage (3) , chamber (2) , and port (C) .