A thread compensator for performing casing running operations. An example method may include visually ascertaining operational parameters of a thread compensator displayed on a video output device. The thread compensator may be connected between a top drive and a travelling block, and a casing running tool may be connected to the top drive. The operational parameters may include the height that the top drive is lifted by the thread compensator and force applied to casing by the top drive. The method may further comprise manually controlling well construction equipment to perform casing running operations based on the ascertained operational parameters.

Provided are an energy regeneration device which can regenerate energy of a working fluid discharged from an actuator while controlling a flow rate of the working fluid, and a work machine including the foregoing device. The regeneration device (100) includes a boom cylinder (20), an inertial fluid container (102), an oil tank (110), an accumulator (105), a low-pressure-side opening/closing device (103), and a high-pressure-side opening/closing device (104). A calculation unit (151) calculates a duty ratio for opening/closing the low-pressure-side opening/closing device (103) and the high-pressure-side opening/closing device (104) in accordance with a desired flow rate of a working fluid discharged from the boom cylinder (20). A regeneration control unit (153) selects alternately the low-pressure-side opening/closing device (103) and the high-pressure-side opening/closing device (104) as a destination with which the inertial fluid container (102) communicates in accordance with the calculated duty ratio, and supplies a discharged working fluid to an accumulator (105).

The present disclosure relates to a gas-charged hydraulic accumulator assembly of a work vehicle, which is hydraulically coupled to a cap side chamber of a hydraulic cylinder. The gas-charged hydraulic accumulator assembly absorbs an impact from a work tool which increases a pressure of a first fluid in the cap side chamber. The gas-charged hydraulic accumulator assembly may include a first accumulator and a second accumulator. The first accumulator has a first gas and is used to receive the first fluid. The second accumulator is coupled to the first accumulator and has a second gas. The pressure of the second gas in a second pre-charged status is higher than a pressure of the first gas in a first pre-charged status. The second accumulator is used to receive the first fluid.

A steam turbine valve drive apparatus in an embodiment includes a piston, a cylinder, a bidirectional pump, a servo motor, and a quick closing mechanism. The cylinder houses the piston in an inner space thereof, the inner space being partitioned by the piston into a first hydraulic chamber and a second hydraulic chamber. The quick closing mechanism executes a quick closing operation of closing the steam valve unit more quickly than the closing operation. Here, the quick closing mechanism executes the quick closing operation by feeding the working oil accumulated in an accumulator to the second hydraulic chamber and draining the working oil from the first hydraulic chamber.

A hydraulic block of a slip control system of a hydraulic vehicle brake system has receptacles for inlet valves and outlet valves of the slip control system arranged on a cover side, and receptacles for block valves, intake valves, and hydraulic accumulator on an opposite main side. All connecting bores for wheel brakes and a main brake cylinder are arranged on a transverse side and an eccentric chamber is arranged on an opposite transverse side of the hydraulic block.

A hydraulic system for a working machine includes a hydraulic actuator having a first fluid chamber and a second fluid chamber, an accumulator, an outputting fluid tube to output an operation fluid, and a switching valve to be switched between a first position and a second position. The first position allows the first fluid chamber and the second fluid chamber to be communicated with the outputting fluid tube and thereby allowing a floating operation. The second position allows the first fluid chamber and the accumulator to be communicated with each other, allows the second fluid chamber and the outputting fluid tube to be communicated with each other, and thereby allows an anti-vibration operation.

A hydraulic system for a work machine includes a first control cylinder to move a boom and a second control cylinder to move a bucket. A body of the first control cylinder has a first fluid chamber and a second fluid chamber. A first control valve is connected to the first fluid chamber via a first fluid path and connected to the second fluid chamber via a second fluid path to control the first hydraulic cylinder. A bucket positioning valve is connected to the second fluid path and a third fluid path to control a second hydraulic cylinder so as to rotate the bucket. A discharge fluid path is connected to the second fluid path between the bucket positioning valve and the first control valve. A discharge control valve is provided in the discharge fluid path to be opened and closed.

A valve, in particular for use as a pressure maintenance-type component (38) in hydraulically actuated hoisting devices (2), having a valve housing (54), which has a control port (40) plus a fluid inlet (64) and a fluid outlet (66), and having a regulating piston (68) longitudinally displaceably arranged in the valve housing (54), which regulating piston, against the action of an energy storage device (70), in particular in the form of a compression spring, brings the regulating piston (68) into at least one position forming a fluid-conveying connection between the fluid inlet (40) and the fluid outlet (66) or blocks this connection by means of a control pressure existing at the control port (40), is characterized in that a first diaphragm (88) is arranged in the regulating piston (68), which connects the control port (40) to a receiving space (62) for the energy storage device (70) in a fluid-conveying manner, and in that a second diaphragm (90) is arranged in an intermediate part (72) in the valve housing (54), by means of which the receiving space (62) can be connected to a compensating chamber (92), which connected to the fluid outlet (66) in a fluid-conveying manner (98).

The present disclosure relates to the technical field of cranes, and in particular to a crane hydraulic control system and a crane. The crane hydraulic control system of the present disclosure includes a prime mover, an execution control mechanism, a hydraulic baking device, a running energy recycling device and an operation energy recycling device. By means of cooperation among the operation energy recycling device, the energy recovery device and the hydraulic energy conversion device, kinetic energy in a driving braking process of the crane and the potential energy in a load lowering process are respectively converted into hydraulic energy for recovery, storage and reuse, therefore, the present disclosure can achieve the recovery of the superstructure energy and the lower vehicle energy of the crane so as to effectively reduce the energy waste.

A header assembly for an agricultural harvesting machine comprises a first frame assembly, a second frame assembly that supports a cutter, and is movable relative to the first frame assembly, a float cylinder coupled between the first frame assembly and the second frame assembly, an accumulator, a controllable reservoir, and fluidic circuitry. The fluidic circuitry comprises a first conduit forming a first fluid path that provides a flow of pressurized fluid under pressure to the float cylinder, so the float cylinder exerts a float force on the second frame assembly, a valve mechanism that is actuatable to inhibit fluid flow along the first fluid path between the accumulator and the float cylinder, a second conduit forming a second fluid path fluidically coupled to the controllable reservoir, the controllable reservoir being controllable to add fluid to the float cylinder.