Each hydraulic switch 122 can have a unique pressure band, wherein the switch 122 only responds when the pressure in the drive lines 108,110 is within the unique pressure band.

Each hydraulic switch 122 can have a unique pressure band, wherein the switch 122 only responds when the pressure in the drive lines 108,110 is within the unique pressure band.

The control unit with programmer is composed of a programmer that includes differential pressure switch, solenoids, hydraulic installation, electrical installation, and support (assembled material).

The hydraulic circuit includes a hydraulic pump, a hydraulic motor, and a hydraulic fluid reservoir containing hydraulic fluid.

Linear pressurestat The linear pressurestat transmits a voltage proportional to the fluid pressure to the ECU.

A hydraulic engine with a water wheel is designed as non-polluting underwater generating plant.

The hydraulic pump (22) supplies hydraulic fluid to the hydraulic cylinder (15).

An electronic pressure switch is more complex than a mechanical pressure switch, and thus generally more expensive.

The hydraulic pump (22) supplies hydraulic fluid to the hydraulic cylinder (15).

A hydraulic supply (78) ports hydraulic fluid to the hydraulic cylinder (72).

Alternatively, or in addition the monitoring may involve passively monitoring a pressure switch, such that activation of the pressure switch is the event indicative of the pressure wave.

A second hydraulic circuit is provided independently from the first hydraulic circuit and connects the second hydraulic pump and the hydraulic motor.

A hydraulic pump (50) provides a hydraulic energy supply for the hydraulic actuator (40).

The hydraulic motor drives the hydraulic pump to intensify the hydraulic fluid driven by inflowing hydraulic fluid and discharged by the hydraulic pump.

In this hydraulic shovel, a hydraulic cylinder drives a boom via a hydraulic oil discharged from a first hydraulic pump.