A controller and related system and method for controlling a choke for choking fluid flow are configured to take into account non-linear behaviors of the choke, to allow more accurate and effective control of the choke. To obtain a desired pressure drop across a choke valve, the controller is configured to monitor the position of a choke actuator coupled to the choke valve and the pressure at the inlet of the choke valve. The controller calculates an adaptive proportional gain coefficient, and optionally adaptive integral and derivative coefficients, based on the choke actuator position, to help mitigate the effects of non-linear behaviors of the choke and, where necessary, based on the inlet pressure, the controller calculates an augmentation correction to address any instability in the choke. The controller then commands the choke actuator accordingly to adjust the flow area through the choke valve.

A fluid end assembly comprising a housing having multiple conduits formed therein. A tubular sleeve is installed within one of the conduits and is configured to house a plurality of packing seals. A seal is installed within a groove formed in the walls of the housing surrounding the tubular sleeve such that the seal engages an outer surface of the tubular sleeve.

A fluid end assembly comprising a housing having multiple conduits formed therein. A tubular sleeve is installed within one of the conduits and is configured to house a plurality of packing seals. A seal is installed within a groove formed in the walls of the housing surrounding the tubular sleeve such that the seal engages an outer surface of the tubular sleeve.

An auxiliary hydraulic manifold for connecting different implements to a work vehicle for hydraulic control may include a housing, a plurality of vehicle-side ports in the housing including a first vehicle-side port, and a plurality of implement-side ports in the housing including a first implement-side port fluidly coupled to the first vehicle-side port and a second implement-side port fluidly coupled to the first vehicle-side port. A number of the plurality of implement-side ports is greater than a number of the plurality of vehicle-side ports. Additionally, the auxiliary hydraulic manifold may include a pilot-operated check valve fluidly coupled between the first vehicle-side port and the first implement-side port.

The present invention provides a device for controlling the exhaust of a vehicle's pneumatic system, herein after referred to as the exhaust controller. The exhaust controller may comprise at least one intake opening operable to receive compressed exhaust air via a pneumatic line and direct it towards at least one exhaust opening operable to redirect and effectively neutralize the force of the exiting air such that prevents the formation of a dust cloud. The intake opening may further comprise an adjustable connector operable to interface with a pneumatic line and create an adjustable seal with the intake opening and the pneumatic line. The pneumatic line may be an exhaust valve of the pneumatic system or airline tubing in fluid communication with the exhaust valve. The exhaust valve may be part of an air compressor, air reservoir, air brake, or an air suspension system.

A system for damping mass-induced vibrations in a machine having a long boom or elongate member, the movement of which causes mass-induced vibration in such boom or elongate member. The system comprises at least one motion sensor operable to measure movement of such boom or elongate member resulting from mass-induced vibration, and a processing unit operable to control a first control valve spool in a pressure control mode and a second control valve spool in a flow control mode in order to adjust the hydraulic fluid flow to the load holding chamber of an actuator attached to the boom or elongate member to dampen the mass-induced vibration. The system further comprises a control manifold fluidically interposed between the actuator and control valve spools that causes the first and second control valve spools to operate, respectively, in pressure and flow control modes.

A mobile hydraulic system includes a hydraulic actuator coupled to a load, and a control unit coupled to the load and/or to the hydraulic actuator. The control unit is adapted to anticipate an over-center transition of the load relative to a gravity vector prior to the over-center transition through the use of sensors configured with accelerometers, gyroscopes and magnetometers. In some examples, the over-center transition is from an overrunning driving of the load to a passive driving of the load. In some examples, the over-center transition is from a passive driving of the load to an overrunning driving of the load. In some examples, the control unit is adapted to control change in a metered flow through one or more ports of the associated actuator to minimize and/or prevent one or more hydraulic effects of the anticipated over-center transition. In some examples, the control unit controls the metered flow by causing one or more actuators (e.g., a solenoid) to shift one or more valve positions to change the flow through one or more ports of the associated actuator.

Disclosed herein are methods and systems of robust electrohydraulic pressure control with distributed damping. The system includes a two-stage pilot operated electrohydraulic pressure reducing-relieving valve have a valve body with a high-pressure port, a low-pressure port, and a variable working pressure port. A valve spool is disposed within the valve body to direct oil flow into and out of a working volume, and a pilot subassembly is also disposed within the valve body to generate a pilot pressure and create a hydraulic motive force to operate the valve spool. A linear electromagnetic actuator is operatively coupled to the pilot subsystem to generate an electromotive force to operate the pilot assembly. The system further includes a fluid path that restrictively communicates a common fluid pressure to a volume of fluid defined by a position of the linear electromagnetic actuator.

An apparatus (1) for damping pressure pulsations, includes: a working chamber (5) to which a working pressure (p.sub.1) is or can be applied; and a compensation chamber (6) which is separated from the working chamber (5) by an at least partially elastic separating diaphragm (4). The apparatus (1) is distinguished in that working chamber (5) and compensation chamber (6) are connected to one another in a fluid-conducting manner via at least one line device (7).

A system. The system includes a valve assembly. The valve assembly includes a first port, a second port fluidically couplable with the first port upon application of negative pressure at the first port, a third port fluidically couplable with the first port upon application of positive pressure at the first port, and a first check valve positioned between the first port and the second port. The system also includes a second check valve fluidically couplable with the third port upon the application of the positive pressure at the first port. The second check valve is positioned external to the valve assembly.