A rotary servo valve comprising a housing portion (105) defining a cylindrical cavity (107) and a first layer of ports. The rotary servo valve further comprises two opposing indented sides and two opposing sides having an increased radius relative to the indented sides, each side of increased radius extending between the two indented sides. The spool portion (103) is mounted for rotation relative to the cylindrical cavity (107), from a neutral position so as to prevent fluid flow through the valve, to an open position in which a fluid flow path is provided.

A distributor device is arranged for controlling a plurality of actuators, each of which is intended to open or close a corresponding mould. The distributor device comprises a rotary part rotatable about an axis and connectable to the actuators, and a stator part in fluid communication with the rotary part. The stator part is provided with: a low pressure distributor element, configured to selectively send an actuating fluid at a first pressure to the rotary part, so that one actuator of the plurality of actuators moves a first component and a second component of the corresponding mould closer to each other from a distanced position to an intermediate position; a high pressure distributor element, configured to selectively send an actuating fluid at a second pressure higher than the first pressure to the rotary part, so that the actuator moves the first component and the second component of the corresponding mould closer to each other from the intermediate position to a forming position; a maintaining distributor element, configured to selectively send an actuating fluid to the rotary part, so that the actuator maintains the first component and the second component in the forming position.

A rotary servo valve comprising a housing portion (105) defining a cylindrical cavity (107) and a first layer of ports. The rotary servo valve further comprises two opposing indented sides and two opposing sides having an increased radius relative to the indented sides, each side of increased radius extending between the two indented sides. The spool portion (103) is mounted for rotation relative to the cylindrical cavity (107), from a neutral position so as to prevent fluid flow through the valve, to an open position in which a fluid flow path is provided.

A robotic device may traverse a path in a direction of locomotion. Sensor data indicative of one or more physical features of the environment in the direction of locomotion may be received. The implementation may further involve determining that traversing the path involves traversing the one or more physical features of the environment. Based on the sensor data indicative of the one or more physical features of the environment in the direction of locomotion, a hydraulic pressure to supply to the one or more hydraulic actuators to traverse the one or more physical features of the environment may be predicted. Before traversing the one or more physical features of the environment, the hydraulic drive system may adjust pressure of supplied hydraulic fluid from the first pressure to the predicted hydraulic pressure.

The present disclosure provides: at least one component of a rotary valve subassembly; a rotary valve assembly including the rotary valve subassembly; a hydraulic circuit including the rotary valve assembly; an assembly including a robot that incorporates the hydraulic circuit; and a method of operating the rotary valve assembly. The at least one component of the rotary valve subassembly includes a spool. The at least one component of the rotary valve subassembly includes a sleeve.

A valve assembly for select distributed discharge of received fluid in a predetermined manner is generally provided. The assembly includes a manifold and a rotatable valve body. The manifold has an internal chamber, a fluid ingress passage for receipt of fluid, and a plurality of fluid discharge conduits. The fluid ingress passage and fluid discharge conduits are in fluid communication with the internal chamber. A first internal chamber section is characterized by the fluid ingress passage with a second internal chamber section characterized by ingress portions of the fluid discharge conduits. The valve body is adapted to be sealingly seated within the internal chamber so as to fluidly isolate the internal chamber sections, and includes a bore axially extending inwardly from a first end thereof for receipt of fluid from the fluid ingress port of the manifold, and a fluid egress passage in fluid communication with the bore for passage of received fluid to a select fluid discharge conduit of the fluid discharge conduits.

A linear actuator system has a rotary spool valve configuration having a spool, a piston, and a cylinder. The spool and piston have return apertures so positioned, configured and angled to direct return flow towards the center of a spool central return port and spool pressure ports to direct pressurized flow into upper or lower chambers. Rotation of the spool synchronizes and aligns ports and apertures to reverse flows and effect upward and downward translation of the cylinder to vibrationally drive an implement to perform work. The positioned and angled apertures direct the fluid to a region demarcated by a total length of 1.5 times the interior diameter of the spool central return port centered about a piston shoulder. A base plug member having a bull-nose tip, baffles and cavities is disposed within the spool central return port to reduce or eliminate cavitation.

In general, techniques are described regarding a rotary servo for actuators. A servo assembly includes a cylindrical outer sleeve including ports, a cylindrical outer spool annularly disposed within the cylindrical outer sleeve, a stepper motor mechanically coupled to the cylindrical outer spool, and an actuator mechanically coupled to compressor variable geometry that controls compression provided by a compressor. The cylindrical outer spool includes channels configured to provide fluidic interconnection between the ports and a cylindrical inner spool, where the cylindrical inner spool is annularly disposed within the cylindrical outer spool, and the cylindrical inner spool includes grooves configured to provide fluidic interconnection through the channels of the cylindrical outer sleeve. The stepper motor is configured to rotate the cylindrical outer spool within the cylindrical outer sleeve to deliver a fluid to and thereby actuate the actuator to control the compressor variable geometry.

Disclosed is a hydraulically driven joint for a robot, which comprises a screw-in cartridge rotary direct-drive electro-hydraulic servo valve and a vane oscillating hydraulic cylinder special for a robot motion joint, the screw-in cartridge rotary direct drive electro-hydraulic servo valve is hereinafter referred to as a hydraulic cartridge rotary direct-drive valve and the vane oscillating hydraulic cylinder special for the robot motion joint is hereinafter referred to as a vane oscillating cylinder, a valve body installation cavity is prefabricated at one end of a center of a center rotating shaft of the vane oscillating cylinder, a shape of the valve body installation cavity is manufactured according to a shape of a plug-in portion of the hydraulic cartridge rotary direct-drive valve, and the hydraulic cartridge rotary direct-drive valve is plugged into the valve body installation cavity.

A servo valve comprises a member disposed in a cavity and axially-moveable therein. The member includes first and second sections, a central section located between the first and second sections and first and second transition sections respectively between the first and second sections and the central section, forming respective first and second outer surfaces angled relative to the axis (X). At least one of the transition sections comprises a non-circular cross-section having a concave portion forming at least part of the respective first and second surfaces and being at least partially aligned with and facing the respective first or second nozzle opening such that rotating the member in said cavity varies the level of obstruction of the first or second nozzle openings by the first or second outer surfaces.