Abstract: Data network components and frameworks for the control and optimization of network traffic using layered architectures, according to embodiments of the invention, are disclosed. In one embodiment, a data network comprises a switch, a data link, a tracking processor, and a planning processor. The planning processor is configured to generate a reference trajectory by receiving a local system state from the tracking processor, calculating a reference trajectory by solving a planning problem, and sending the reference trajectory to the tracking processor. The tracking processor is configured to track the reference trajectory by determining a set of states of the switch over a time interval, sending a local system state to the planning processor, receiving the reference trajectory from the planning processor, computing a control action by solving a tracking problem based on the reference trajectory, determining an instruction based on the control action, and sending the instruction to the switch.

Abstract: Data network components and frameworks for the control and optimization of network traffic using layered architectures, according to embodiments of the invention, are disclosed. In one embodiment, a data network comprises a switch, a data link, a tracking processor, and a planning processor. The planning processor is configured to generate a reference trajectory by receiving a local system state from the tracking processor, calculating a reference trajectory by solving a planning problem, and sending the reference trajectory to the tracking processor. The tracking processor is configured to track the reference trajectory by determining a set of states of the switch over a time interval, sending a local system state to the planning processor, receiving the reference trajectory from the planning processor, computing a control action by solving a tracking problem based on the reference trajectory, determining an instruction based on the control action, and sending the instruction to the switch.

Abstract: A knife gate valve comprising a two-piece valve body, a knife gate, an elastomeric transverse seal, an elastomeric perimeter seal, and a pair of elastomer liners. Each elastomer liner is positioned between the knife gate and one of the mating valve body halves and defines a chamber for receiving the perimeter seal. Each liner has a port that corresponds to the flow channel, a sealing portion that extends into a sealing chamber to cooperate with the transverse seal, and an orifice liner extension that lines the orifice of the corresponding valve body half. O-rings, preferably of a softer material than the elastomer liner, may be positioned on the outer rim of the orifice liner extensions for creating a seal among the elastomer liner, the corresponding valve body half, and a corresponding mating flange of a fluid handling system.

Abstract: A gate seal for a knife gate valve comprising a sealing surface lining the gate channel and an integral gasket for compression between valve body halves, a chest seal for a knife gate valve comprising a body having an expandable sealing surface and one or more injection chambers adapted to receive an injectable packing, each chamber having a cross-sectional area that is completely surrounded by the body member, and/or a knife gate valve comprising one or both such seals. The chest seal body may comprise a knife gate slot that is peripherally surrounded by the body. The gate seal and the chest seal may comprise a single integral elastomeric member or separate components.