This invention relates to twin seal rotary valves and Hybrid High Integrity Pressure Protection System (H-HIPPS) for critical services, the hybrid system includes a quick isolation subsystem between an overpressure zone and a normal pressure zone and a quick releasing subsystem between the overpressure zone and a lower pressure zone with quadruple redundancies for long service without repair, more particularly, the hybrid system has the novel rotary valve with at least two offsets, twin closure members, twin wedge seal seat assemblies, the valve operation mechanism is a combination of rotary movements and linear movement between close and open positions for blocking and releasing over pressurize fluids and protecting and the valves and the pipelines or the process plants from surge pressure, fire or leak at the highest level of a system reliability.

A fluid flow component including a body having a flow path therein, and a blocking component movable between a closed position where the blocking component blocks a flow of fluid through the flow path, and an open position where the blocking component does not block the flow of fluid through the flow path. The blocking component is rotatable about a center axis and includes a partial spherical outer surface that extends 270 degrees or less relative to the center axis. The component further includes an inlet seat that at least partially overlaps with the blocking component along a length of the flow path. An inner surface of the inlet seat is aligned with a portion of the body located immediately upstream of the inlet seat.

A valve device includes: a ball valve having a ball face shaped in a convex spherical surface; and a valve seat having a seat face shaped in a concave spherical surface. The seat face is pressed onto the ball face. The ball valve is rotated to open a valve by communicating a valve opening defined in the ball valve and a seat opening defined in the valve seat with each other, and to close the valve by stop the communication. A diameter of the seat opening 2 is smaller than a diameter of the valve opening 1. A curvature radius of the ball face R1 is smaller than or equal to a curvature radius of the seat face is R2.

A sealing arrangement for a ball valve. The sealing arrangement includes a hydraulic fluid injection port configured to receive pressurised fluid from a pressurised fluid source, and a plurality of fluid channels connected to the injection port and configured to be arranged, in use, around the interior of the ball valve to direct the pressurised fluid to a gap between a seal of the ball valve and a housing of the ball valve to exert a force on the seal towards a ball of the ball valve.

A valve including a flow control assembly having an adaptive, floating closure member is provided. In one embodiment, a ball valve includes a floating closure member having a shoulder enclosed within a recess of the valve body. The recess is larger than the shoulder of the closure member and allows axial movement of the closure member with respect to the valve body and along a flow path through the valve. Additional valve systems, devices, and methods are also disclosed.

A refrigerant control valve apparatus which maintains improved sealing ability while being restrained from being enlarged includes a housing including a first discharge port and a second discharge port which includes a smaller diameter than the first discharge port, a rotor rotatably housed at the housing, a bore portion provided at an outer wall portion of the rotor to control a flow of refrigerant relative to the first discharge port and the second discharge port, a second seal portion of the second discharge port being configured to make contact with an edge portion of the bore portion in a case where the rotor is specified at any rotation position for sending out the refrigerant to the second discharge port.

A system configured to adjust a seat of a ball valve includes a cam-actuated valve that is configured to be controlled via rotation of a stem coupled to a ball of the ball valve. The cam-actuated valve is configured to enable a flow of fluid at a first pressure to an opening extending through a body of the ball valve to drive the seat of the ball valve away from the ball when the cam-actuated valve is in a first position.

A valve for intercepting a fluid in a duct is provided. The valve has a valve body, a ball shutter, and a sealing device for forming a fluid seal with an external surface of the ball shutter. The sealing device has a polymeric sealing ring located in contact with the external surface, and a metal support ring coupled to the sealing ring. The support ring has an annular coupling portion having an annular contact portion formed by a frustoconical wall, and an elastically bendable influencing portion, so as to form an elastic lever. In an emergency condition in which the sealing ring is absent the annular contact portion is in contact with the external surface of the ball shutter due to at least fluid pressure, forming the fluid seal even in the emergency condition.

A top entry ball valve comprises a housing with a central cavity communicating with two bores which define a flow path through the housing. A ball valve element is provided and comprises a through bore. The ball valve element is rotatably mounted within the central cavity for rotation about an axis for selectively aligning the through bore with the housing bores. The ball valve element further comprises first and second flat surfaces on opposite sides of the ball valve element. The flat surfaces are perpendicular to the axis. The top entry ball valve further comprises first and second seats which are configured to provide a seal between the ball valve element and the central cavity. First and second protective rings are provided for receiving and supporting at least a portion of the first and second seats.

A fluid valve with a single shaft-sealing module is disclosed. The single shaft-sealing module allows the annular shaft sealing rings to be squeezed to slightly deform to prevent gaps being formed between the shaft and the inner surface of the valve body, and facilitates easy clean and/or replacement of the worn shaft sealing rings.