Tapping circuit including a tapping valve for replenishing and/or flushing the casing of a hydraulic motor

A hydraulic circuit including a main fluid circuit which comprises:

• a hydraulic motor having a preferred operating direction and having a casing which defines an internal space and in which a cylinder block is disposed;
• and
• at least two main pipes suitable for being put in communication with the cylinder block of the motor and constituting respectively, in the preferred operating direction of said motor a feed mum pipe and a discharge main pipe;
• the hydraulic circuit further comprising a tapping circuit including means for tapping fluid from the main fluid circuit and means for removing the tapped fluid to a reservoir under atmospheric pressure via a removal pipe;
• said tapping circuit further comprising a single tapping and removal valve connected continuously vie a tapping pipe to a single one of said main pipes, the valve also being connected to the removal pipe, the tapping and removal valve being connected to the discharge main pipe in the preferred operating direction of the motor;
• said tapping and removal valve having a communication passageway between the tapping pipe and the removal pipe, said valve including means or causing the cross-sectional area of said passageway to vary continuously as a function of the pressure difference between the lapping pipe and the removal pipe;
• wherein the tapping and removal valve has means for opening the communication passageway only when the pressure difference between the tapping pipe end the removal pipe is at least equal to a threshold value.

A hydraulic circuit including a main fluid circuit which comprises:

• a hydraulic motor having a preferred operating direction and having a casing which defines an internal space and in which a cylinder block is disposed;
• and
• at least two main pipes suitable for being put in communication with the cylinder block of the motor and constituting respectively, in the preferred operating direction of said motor a feed main pipe and a discharge main pipe;
• the hydraulic circuit further comprising a tapping circuit including means for tapping fluid from the main fluid circuit and means for removing the tapped fluid to a reservoir under atmospheric pressure via a removal pipe;
• said tapping circuit further comprising a single tapping and removal valve connected continuously via a tapping pipe to a single one of said main pipes, the valve also being connected to the removal pipe, the tapping and removal valve being connected to the discharge main pipe in the preferred operating direction of the motor;
• said tapping and removal valve having a communication passageway between the tapping pipe and the removal pipe, said valve including means for causing the cross-sectional area of said passageway to vary continuously as a function of the pressure difference between the tapping pipe and the removal pipe;
• and
• further comprising a receiver which has an inlet connected to an auxiliary outlet of the tapping and removal valve, and which feeds at least one auxiliary circuit with fluid under pressure.

A hydraulic circuit including a main fluid circuit which comprises:

• a hydraulic motor having a preferred operating direction and having a casing which defines an internal space and in which a cylinder block is disposed;
• and
• at least two main pipes suitable for being put in communication with the cylinder block of the motor and constituting respectively, in the preferred operating direction of sold motor a feed main pipe and a discharge main pipe;
• the hydraulic circuit further comprising a tapping circuit including means for tapping fluid from the main fluid circuit and means for removing the tapped fluid to a reservoir under atmospheric pressure via a removal pipe;
• said tapping circuit further comprising a single tapping and removal valve connected continuously via a tapping pipe to a single one of said main pipes, the valve also being connected to the removal pipe, the tapping and removal valve being connected to the discharge main pipe in the preferred operating direction of the motor,
• said tapping and removal valve having a communication passageway between the tapping pipe and the removal pipe, said valve including means for causing the cross-sectional area of said passageway to vary continuously as a function of the pressure difference between the tapping pipe and the removal pipe;
• wherein the main circuit is a dosed circuit, and wherein the tapping and removal valve is a flushing valve, the tapped fluid being removed to be cooled.