A solenoid device including pressure altering means for altering an output pressure of the solenoid device; and an actuator for providing an actuating signal to said pressure altering means; wherein the solenoid device further includes a sensor arranged to sense a control value of the solenoid device, and a controller which receives a request and is arranged to control delivery of power to the actuator with feedback from the sensor until the control value meets the request.

A control valve including: a valve housing including a piston space; and a control piston which is movably arranged in the piston space and sub-divides the piston space into at least a first valve space and a second valve space, the control valve including at least a leakage path which sets a desired leakage between the first valve space and the second valve space. A motor vehicle device including an adjustable rotary pump including an adjusting means, for adjusting a delivery volume of the rotary pump, and the control valve, using which a pressure for adjusting the adjusting means can be governed, the motor vehicle device including a means which presses the control piston into a first position and holds it there, and the at least one other inlet of the control valve is connected to a high-pressure side of the rotary pump when the rotary pump is in operation.

A proportional pressure regulating valve has a valve piston (12) longitudinally movable in a valve housing (10) and connecting a utility connection (A) to a pressure supply connection (P) or to a tank or return flow connection (T) dependent on the displacement position of the valve piston. The valve piston is actuated by an actuation magnet (48) that can be supplied with current. A control device (50) is between the valve piston (12) and the actuation magnet (48), and allows the valve piston (12) to become pressureless on the valve piston side (52) facing the actuation magnet (48). The valve piston (12) is displaced in the direction of the actuation magnet (48) under the supply and/or utility connection pressure when the actuation magnet is not actuated.

A spool valve arrangement comprising a spool arranged for linear movement within a bore to regulate flow of fluid through the bore according to the linear position of the spool relative to the bore, the spool having an end arranged to be engaged, in use, by a drive member to cause the linear movement, the spool valve arrangement further comprising a sliding block component moveably attached to the spool end and arranged to engage with the drive member, in use, such that the drive member engages with the spool end via the sliding block component and the sliding block component moves relative to the spool to compensate for non-linear movement of the drive member.

A hydraulic valve includes a valve body having first and second ends, a bore extending therebetween, and first and second drain passages opening to the bore; a spool disposed in the bore and biased in a neutral position, the spool having first and second ends and first and second annuli axially spaced from the first and second ends respectively, whereby when the spool is in the neutral position, the first and second drain passages are connected to first and second bores respectively via the respective annulus, and wherein the spool is axially movable relative to the body by fluid acting on one of the ends to block fluid flow from the first and second bores to the first and second drain passages.

First and second insertion holes and first and second recessed grooves are formed such that, on a plane that is perpendicular to a first side surface and a second side surface and that includes an axis of a spool-sliding hole, the shortest distance from the axis of the spool-sliding hole to a hole wall surface of the first insertion hole, the shortest distance from the axis of the spool-sliding hole to a hole wall surface of the second insertion hole, the distance from the axis of the spool-sliding hole to a bottom wall surface of the first recessed groove, and the distance from the axis of the spool-sliding hole to a bottom wall surface of the second recessed groove are equal to one another.

In a seat component received in a receiving region of a first body of a body, one surface of a contacting portion and one surface of an engaging portion are planar and are flush with each other, and the other surface of the contacting portion and the other surface of the engaging portion are planar and are flush with each other. The engaging portion engages two portions of the first body, which form one opening of the receiving region, in a state where a distal end of the seat component reaches another opening of the receiving region. Furthermore, in the state where the engaging portion engages the portions of the first body, a second body of the body covers the one opening and contacts the engaging portion. Thereby, the engaging portion engages the three portions of the body, so that movement of the seat component is effectively limited.

Embodiments of a fluid flow regulating device and methods of using the same are described. Certain embodiments manages fluid flow between one or more input ports and output ports at least partly in response to fluid pressure changes and/or by a mechanism driven by fluid flow, optionally without using electrical power.

A spool valve device includes a valve body, an actuator port, a spool, a supply passage, and a regeneration flow passage formed in the spool. An inflow port of the regeneration flow passage always communicates with the actuator port, when the spool is placed at a regeneration switching position where a predetermined moving amount from a neutral position is ensured, the outflow port of the regeneration flow passage communicates with the actuator port through the supply passage, and when the spool is placed at a position other than the regeneration switching position, the communication between the outflow port and the actuator port is blocked.

A flow control valve includes a valve body having an bore and a plurality of fluid ports in communication with the bore. A valve spool is axially slidably disposed in the valve body, and an end portion of an end of the valve spool has a convex curved surface. A linear actuator is disposed at one end of the valve body and includes an armature slidable along an axial direction of the valve spool. The armature includes a head portion having a convex curved surface configured to abut against the end portion of the valve spool. The engagement structure between the valve spool and the armature of the flow control valve is improved, which enables the valve spool and the armature to be automatically aligned. This reduces the precision requirement of contact between the valve spool and armature, which facilitates mass production and reduces cost of the valves.