The system's shut-off and discharge valves, if operated through the square pin, allow the system to be emptied

The drain valves

what they are and how they work and operate

The drain valves of the hydraulic system are special faucets operated by a square pin.

These can only be operated by special keys, for security reasons.

These valves are used to close a part of the system, allowing it to be emptied "unloaded" for these are called discharge.

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The drain valves

what they are and how they work and operate

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