Abstract: A ride control valve includes a valve body defining a work passage, a pump passage, a tank passage, and an accumulator passage configure to couple to an accumulator. A ride control spool is movably disposed within the valve body and configured to move between a a first ride control position to discharge the accumulator, a second ride control position configured to charge the accumulator at a variable charge rate, a third ride control configured to balance the accumulator pressure with the work passage pressure, and a fourth ride control position configured to couple the accumulator to the work passage. A pressure balancing spool is movably disposed within the ride control spool to selectively couple the accumulator passage with each of the pump passage and the tank passage to balance the accumulator pressure. The ride control valve is configured couple to a directional control valve without external conduit.

Abstract: A valve includes a body with a spool bore, a supply passage, a tank passage, and a workport. A spool, in the spool bore, has a first position providing a first path between the supply passage and the workport, a second position providing a second path between the tank passage and the workport, and a closed position. A latch assembly includes a cam that moves in response to pressure, a sphere engaged by the cam, and a notch. While the spool is in the second position, fluid flowing from the workport to the tank passage produces a first pressure, which causes the cam to hold the sphere in the notch, thereby inhibiting spool movement; and when the fluid flow from the workport to the tank passage terminates, a second pressure is produced causing the cam allow the sphere to move out of the notch, thereby enabling the spool movement.

Abstract: A system has a variable displacement pump that supplies pressurized fluid to power a plurality of hydraulic functions. Each hydraulic function has a control valve with a variable source orifice controlling fluid flow between the pump and a flow summation node, and a variable metering orifice controlling fluid flow between the flow summation node and a hydraulic actuator. Variable bypass orifices in the control valves are connected in series between the flow summation node and a tank. As the metering orifice in a control valve enlarges, the source orifice enlarges and the bypass orifice shrinks. This alters pressure at the flow summation node, which is used to control the output of the pump. Components are provided to give selected hydraulic functions different levels of priority with respect to consuming fluid flow from the pump.

Abstract: A system has a variable displacement pump that supplies pressurized fluid to power a plurality of hydraulic functions. Each hydraulic function has a control valve with a variable source orifice controlling fluid flow between the pump and a flow summation node, and a variable metering orifice controlling fluid flow between the flow summation node and a hydraulic actuator. Variable bypass orifices in the control valves are connected in series between the flow summation node and a tank. As the metering orifice in a control valve enlarges, the source orifice enlarges and the bypass orifice shrinks. This alters pressure at the flow summation node, which is used to control the output of the pump. Components are provided to give selected hydraulic functions different levels of priority with respect to consuming fluid flow from the pump.

Abstract: An assembly of a plurality of hydraulic control valves is housed in a single-piece body. For each control valve, a spool bore and an aperture for a pressure compensation valve are provided in the monolithic body. Each spool bore is connected to several return passages and a supply passage that extend through the monolithic body. A pair of workports also is connected to each spool bore. A relief valve return passage also extends through the monolithic body and where needed, apertures for pressure relief valves extend from a surface of the monolithic body intersecting the relief valve return passage and a given workport. A load sense passage and a second supply passage also are formed in the monolithic body.

Abstract: An apparatus and method for controlling hydraulic output to a plurality of actuatable devices are disclosed. The apparatus includes a plurality of main valves coupled, respectively, to the actuatable devices and to respective secondary valves, and also an adjustment valve that is coupled between a pressure source and one or more of the secondary valves. The adjustment valve receives a first indication of a pressure at the one or more secondary valves, and a second indication related to a highest load pressure. The adjustment valve allows pressure to be provided from the pressure source to the one or more secondary valves when the second indication exceeds the first indication, such that an equal amount of fluid flow occurs with respect to each of those secondary valves that is reduced in comparison with the fluid flow to any other secondary valves that are not connected to the adjustment valve.

Abstract: An apparatus and method for controlling hydraulic output to a plurality of actuatable devices are disclosed. The apparatus includes a plurality of main valves coupled, respectively, to the actuatable devices and to respective secondary valves, and also an adjustment valve that is coupled between a pressure source and one or more of the secondary valves. The adjustment valve receives a first indication of a pressure at the one or more secondary valves, and a second indication related to a highest load pressure. The adjustment valve allows pressure to be provided from the pressure source to the one or more secondary valves when the second indication exceeds the first indication, such that an equal amount of fluid flow occurs with respect to each of those secondary valves that is reduced in comparison with the fluid flow to any other secondary valves that are not connected to the adjustment valve.

Abstract: An assembly of a plurality of hydraulic control valves is housed in a single-piece body. For each control valve, a spool bore and an aperture for a pressure compensation valve are provided in the monolithic body. Each spool bore is connected to several return passages and a supply passage that extend through the monolithic body. A pair of workports also is connected to each spool bore. A relief valve return passage also extends through the monolithic body and where needed, apertures for pressure relief valves extend from a surface of the monolithic body intersecting the relief valve return passage and a given workport. A load sense passage and a second supply passage also are formed in the monolithic body.