Boom down operation
1. Neutral
2. Joystick signal(BD) ON
- Spool move and close center passage.
- P2c1 oil make drain passage by moving holding spool
3. Oil supplied to the small chamber and return oil try to return to tank
4. Holding valve open
- Return oil go through the hole of spool and open back-pressure check valve then return to tank. valve.
Build-up return pressure.
- When supply pressure is low,internal check valve can be open and make passage to the supply side.
Picture text:
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