Fluid flow control devices, systems, and methods may include a body extending along a longitudinal axis. The body has a fluid inlet at a first axial end of the body and a fluid outlet at a second axial end of the body. Channels may extend through an interior portion of the body between the fluid inlet at the first axial end and the fluid outlet at the second axial end. The channels collectively define fluid pathways through the body.

Fluid flow control devices, systems, and methods may include a body extending along a longitudinal axis. The body has a fluid inlet at a first axial end of the body and a fluid outlet at a second axial end of the body. Channels may extend through an interior portion of the body between the fluid inlet at the first axial end and the fluid outlet at the second axial end. The channels collectively define fluid pathways through the body.

A flow control device includes a stack of annular discs positioned in a flow path. Each disc includes fluid passageways extending between inner and outer perimeters of the disc, with each passageway defining a flow axis extending out of the disc and radially offset from a central axis of the discs. A plug is moveable relative to the discs between closed and open positions. In the closed position, a cylindrical section of the plug is positioned to block fluid flow through the annular discs. In the open position, the annular discs and a tapered section of the plug collectively define an annular vortex chamber. The fluid passageways in the annular discs and the tapered section of the plug collectively impart a rotational flow when the plug is in the open position and as fluid exits the annular discs.

A flow control device includes a stack of annular discs positioned in a flow path. Each disc includes fluid passageways extending between inner and outer perimeters of the disc, with each passageway defining a flow axis extending out of the disc and radially offset from a central axis of the discs. A plug is moveable relative to the discs between closed and open positions. In the closed position, a cylindrical section of the plug is positioned to block fluid flow through the annular discs. In the open position, the annular discs and a tapered section of the plug collectively define an annular vortex chamber. The fluid passageways in the annular discs and the tapered section of the plug collectively impart a rotational flow when the plug is in the open position and as fluid exits the annular discs.

A capacity control valve includes a valve housing discharge, port, a suction port, and control ports, and a valve element to be brought into contact with and separated from a valve seat by a driving force of a solenoid to open and close a communication between the control and discharge ports or communication between the control port and the suction port. A sliding region is formed by an inner peripheral surface of the valve housing and an outer peripheral surface of the valve element, a groove extending in a circumferential direction is formed in at least one of the housing inner peripheral surface of the valve housing and the outer peripheral surface of the valve element, and the sliding region has a structure in which a swirling current is generated in the groove by fluid flowing from a high-pressure side to a low-pressure side in a clearance between the inner peripheral surface and the outer peripheral surface of the valve element.

A displacement control valve includes a valve housing, a valve element fitted in a guide passage of the valve housing, and a solenoid for driving the valve element to open and close it, a tapered portion is provided at one of an outer peripheral surface of the valve element and a guide surface of the guide passage, and a spiral groove is provided in the other, wherein the tapered portion is set such that a gap between the valve element and the guide passage is larger toward the low-pressure side than on the high-pressure side, and the tapered portion and the spiral groove are provided such that a starting point of the tapered portion is located within the region of the spiral groove in the entire range between the starting point and the ending point of the stroke of the valve element.

A displacement control valve includes a valve housing, a valve element fitted in a guide passage of the valve housing, and a solenoid for driving the valve element to open and close it, a tapered portion is provided at one of an outer peripheral surface of the valve element and a guide surface of the guide passage, and a spiral groove is provided in the other, wherein the tapered portion is set such that a gap between the valve element and the guide passage is larger toward the low-pressure side than on the high-pressure side, and the tapered portion and the spiral groove are provided such that a starting point of the tapered portion is located within the region of the spiral groove in the entire range between the starting point and the ending point of the stroke of the valve element.

A decompression mechanism may include a decompression case having an inlet that receives a beverage and an outlet that discharges the beverage; a decompression inner member including an inner body positioned inside of the decompression case and a guide formed in a spiral shape on an outer circumference of the inner body and in contact with an inner face of the decompression case; and a decompression channel defined between the decompression case and the decompression inner member. The decompression channel may have an input opening in communication with the inlet and an output opening in communication with the outlet, and a cross-sectional area of the decompression channel may increase as the decompression channel extends from the input opening to the output opening.

A decompression mechanism may include a decompression case having an inlet that receives a beverage and an outlet that discharges the beverage; a decompression inner member including an inner body positioned inside of the decompression case and a guide formed in a spiral shape on an outer circumference of the inner body and in contact with an inner face of the decompression case; and a decompression channel defined between the decompression case and the decompression inner member. The decompression channel may have an input opening in communication with the inlet and an output opening in communication with the outlet, and a cross-sectional area of the decompression channel may increase as the decompression channel extends from the input opening to the output opening.

A fill valve for receiving a fluid flow includes a lower pipe and a flow restrictor cartridge. The flow restrictor cartridge is received in the lower pipe. The flow restrictor cartridge receives the fluid flow at a first fluid flow rate and provides the fluid flow as a second fluid flow rate lower than the first fluid flow rate. The flow restrictor cartridge includes a receiver and a compact flow restrictor. The compact flow restrictor is received by the receiver. The compact flow restrictor is configured to facilitate the reduction from the first fluid flow rate to the second fluid flow rate.