A metering tube assembly for regulating flow of a fluid is disclosed. The metering tube assembly can include a fluid inlet, a fluid outlet, and a plurality of stacked metering plates located between the fluid inlet and the fluid outlet, each of the plurality of stacked metering plates defining a fluid passageway having a length greater than a thickness of the metering plate, wherein the stacked metering plates are arranged such that a fluid flowing through the metering plates flows sequentially through the fluid passageways of the metering plates.

A valve for regulating the flow of a fluid includes a housing defining a fluid inlet and a fluid outlet. A flow control element is disposed within the housing and is configured to dissipate energy in a fluid flowing therethrough from the fluid inlet to the fluid outlet. A valve seat is positioned within the housing and includes a plurality of vortex generators which induce vortices in the fluid as the fluid flows through the valve seat. A plug is disposed within the housing and is moveable relative thereto between closed and open positions. The plug moves away from the valve seat as the plug moves from the closed position toward the open position such that fluid flow through the flow control element and the valve seat increases as the plug is moved from the closed position toward the open position.

Disclosed are a self-pressure-relief air distribution mechanism and a corresponding cryogenic refrigerator. The self-pressure-relief air distribution mechanism includes an air distribution valve (6) and a rotary valve (7), where a rear face of the air distribution valve (6) is divided into a high-pressure face (66) and a low-pressure face (65), and the high-pressure face (66) and the low-pressure face (65) are hermetically separated by a third sealing ring (b3) that seals the air distribution valve (6) and a cover (2); and the air distribution valve (6) is provided with a pressure-relief hole (61) that axially penetrates an air distribution face (64) and the low-pressure face (65) of the air distribution valve (6), and a low-pressure passage (22) of the cover (2) can communicate with the rear face of the air distribution valve (6) via the pressure-relief hole (61), to guide a low-pressure airflow in the cover (2) to the rear face of the air distribution valve (6). The cryogenic refrigerator includes the self-pressure-relief air distribution mechanism. With the provision of the pressure-relief hole (61) and the third sealing ring (b3), the self-pressure-relief air distribution mechanism has a reduced pressure receiving area, thereby reducing a positive acting force and reducing wear.

Disclosed are a self-pressure-relief air distribution mechanism and a corresponding cryogenic refrigerator. The self-pressure-relief air distribution mechanism includes an air distribution valve (6) and a rotary valve (7), where a rear face of the air distribution valve (6) is divided into a high-pressure face (66) and a low-pressure face (65), and the high-pressure face (66) and the low-pressure face (65) are hermetically separated by a third sealing ring (b3) that seals the air distribution valve (6) and a cover (2); and the air distribution valve (6) is provided with a pressure-relief hole (61) that axially penetrates an air distribution face (64) and the low-pressure face (65) of the air distribution valve (6), and a low-pressure passage (22) of the cover (2) can communicate with the rear face of the air distribution valve (6) via the pressure-relief hole (61), to guide a low-pressure airflow in the cover (2) to the rear face of the air distribution valve (6). The cryogenic refrigerator includes the self-pressure-relief air distribution mechanism. With the provision of the pressure-relief hole (61) and the third sealing ring (b3), the self-pressure-relief air distribution mechanism has a reduced pressure receiving area, thereby reducing a positive acting force and reducing wear.

In one aspect, an aspiration system for a work vehicle includes an exhaust tube extending along a flow direction from an upstream end to a downstream end. The exhaust tube defines an exhaust passage extending from the upstream end of the exhaust tube to the downstream end of the exhaust tube. The exhaust tube includes a venturi portion. The aspiration system also includes an aspiration tube in flow communication with the venturi portion and configured to receive an aspirated airflow. The system further includes a flow adjustment mechanism provided in operative association with venturi portion such that the flow adjustment mechanism is configured to adjust a cross-sectional flow area of the venturi portion of the exhaust tube.

A fluid control valve includes a valve housing having a fluid inlet and a fluid outlet. A valve body is disposed within the valve housing and is transitional relative to the valve housing between an open position and a closed position. In the closed position, the valve body prevents fluid flow between the fluid inlet and the fluid outlet. The valve body is incrementally transitional from the closed position to the open position to incrementally increase the amount of fluid flow from the fluid inlet to the fluid outlet. A flow control element is positioned within the valve housing downstream of the valve body. The flow control element includes a peripheral body and an inward body having a plurality of flow control passageways extending therethrough. The flow control element additionally includes an opening defined collectively by the peripheral body and the inward body.

A ball for a hydraulic component comprises a spherical body provided with at least one first through channel, which extends along a first axis; and at least one flow changer element arranged along the first through channel.

A ball valve (10) is described comprising a valve body (12) in which an axial channel (14) for the unidirectional flow of a fluid is obtained. The axial channel (14) extends between an inlet port (11) and an outlet port (13) for the fluid, wherein the ports are axially aligned with the axis of the axial channel (14). The valve is provided with a motorized actuator (20) for adjusting the position of the fluid adjusting ball (15) and comprises a head block (17) for installing the motorized actuator (20) on the valve body (12). The head block (17) includes at least one stem (21) for rotating the ball (15). The valve body (12) has a first window (26) whose axis is coincident with the axis of rotation of the ball (15) and at least one second window (27) whose axis is coincident with the axis of rotation of the ball (15). The first and second windows (26, 27) are symmetrically made in opposite parts of the valve body (12) with respect to the axis of the axial channel (14) and have the same shape and size to receive, on one side, the head block (17) on the valve body (12) and, on the opposite side of the valve body (12), a covering element (18). The head block (17) has an engaging portion (71) having shape and size adapted to allow it to be inserted into the first window (26) or into the second window (27).

Fluid flow control devices comprise a cylindrical body extending along a longitudinal axis and having a sidewall. The cylindrical body has a first channel extending longitudinally along the sidewall and a second channel extending longitudinally along the sidewall. At least a portion of one of the at least one first channel and the at least one second channel extends longitudinally at an oblique angle with respect to the longitudinal axis to form a pattern of channels for improving the flow characteristics of a fluid through the channels.

Fluid flow control devices comprise a cylindrical body extending along a longitudinal axis and having a sidewall. The cylindrical body has a first channel extending longitudinally along the sidewall and a second channel extending longitudinally along the sidewall. At least a portion of one of the at least one first channel and the at least one second channel extends longitudinally at an oblique angle with respect to the longitudinal axis to form a pattern of channels for improving the flow characteristics of a fluid through the channels.