An improved autonomous well valve has a body that constitutes an actuator for opening and closing of first and second valves. The body has a body axis of symmetry. The body, which in operation is submerged, has an effective density that is equal or greater than the density of a first fluid and less than the density of a second fluid. The body is placed in a housing, the housing having a housing axis of symmetry. At least two first valves are designed to allow flow between the inside and outside of the housing, are distributed about the body axis and mechanically connected between the body and the housing. The body axis at the first valves is restricted from moving above the housing axis.

Disclosed is an electro-hydraulic relay valve and corresponding valve assembly for a SAHR brake. First actuators are arranged to act on a first end of a floating valve spool and second actuators are arranged to act on a second end of the valve spool. One of the second actuators can receive hydraulic pressure from a pilot valve. In a first valve position, the pressure supply port communicates with the working port and the tank port is closed. In a second valve position, the pressure supply port is closed and communicates via a first sense line with one of the first actuators, the working port directs pressure to the tank port, the tank port communicates via a second sense line with another of the first actuators, and the working port communicates via a third sense line with one of the second actuators. In a central position, all three ports are closed.

Disclosed is an electro-hydraulic relay valve and corresponding valve assembly for a SAHR brake. First actuators are arranged to act on a first end of a floating valve spool and second actuators are arranged to act on a second end of the valve spool. One of the second actuators can receive hydraulic pressure from a pilot valve. In a first valve position, the pressure supply port communicates with the working port and the tank port is closed. In a second valve position, the pressure supply port is closed and communicates via a first sense line with one of the first actuators, the working port directs pressure to the tank port, the tank port communicates via a second sense line with another of the first actuators, and the working port communicates via a third sense line with one of the second actuators. In a central position, all three ports are closed.

The present disclosure relates to a valve assembly adapted to be located at least partially in a body of fluid for controlling fluid flow from the body of fluid to a fluid outlet port. The valve assembly has an extension in a first direction and includes a fluid inlet port having an extension at least partially in the first direction. The valve assembly further includes a valve member being movable in the first direction relative to the fluid inlet port between an open position, in which the fluid inlet port is adapted to provide a fluid communication between the body of fluid and the fluid outlet port, and a closed position, in which the valve member covers the fluid inlet port such that fluid communication between the body of fluid and the fluid outlet port via the fluid inlet port is prevented.

The present disclosure relates to a valve assembly adapted to be located at least partially in a body of fluid for controlling fluid flow from the body of fluid to a fluid outlet port. The valve assembly has an extension in a first direction and includes a fluid inlet port having an extension at least partially in the first direction. The valve assembly further includes a valve member being movable in the first direction relative to the fluid inlet port between an open position, in which the fluid inlet port is adapted to provide a fluid communication between the body of fluid and the fluid outlet port, and a closed position, in which the valve member covers the fluid inlet port such that fluid communication between the body of fluid and the fluid outlet port via the fluid inlet port is prevented.

A shut-off device for a pipe in a pipeline and responsive to ingress of water, has at least two valves for installation in the pipe of the pipeline. Each valve has a valve member supported for movement between an open position when the valve is open for passage of a fluid through the pipe, and a closed position when the valve is closed for preventing passage of the fluid through the valve. The device includes a buoyant member associated with the valve members for causing movement of the valve members to the closed positions upon ingress of water to the buoyant member. The valve members are moved to the closed positions in respective upstream and downstream directions of passage of the fluid through the pipe.

A float valve for a chemical reactor has a central pipe which glides around a liquid transfer pipe when a liquid level rises and falls, thereby opening for fluid transfer through liquid transfer apertures in the transfer pipe when the liquid level is rising and shutting off for fluid transfer when the float lowers and seals against a sealing ring placed on the transfer pipe below the liquid transfer apertures.

A float valve for a chemical reactor has a central pipe which glides around a liquid transfer pipe when a liquid level rises and falls, thereby opening for fluid transfer through liquid transfer apertures in the transfer pipe when the liquid level is rising and shutting off for fluid transfer when the float lowers and seals against a sealing ring placed on the transfer pipe below the liquid transfer apertures.

A valve arrangement according to the present disclosure includes a valve module and a drain valve. The valve module includes first and second functional spaces, and an attachment interface defining a passage into one of the first or second functional spaces. The drain valve includes a fluid inlet and a fluid outlet formed through a common connector part that is connectable to the attachment interface to connect the fluid inlet of the drain valve to the second functional space and the at least one fluid outlet to the first functional space.

A water-inflow prevention device is provided by installing a closing lid 6 for blocking a duct 2 of an air pressure regulating valve 1, which regulates air pressure inside a cabin 101. A buoyant body 9 is attached to the disc-shaped closing lid 6 installed to the duct 2 so as to be rotatable around a rotation shaft 7. The buoyant body 9 receives a buoyant force from water when immersed in the water. Since the side of the closing lid 6 in which the buoyant body 9 is attached is thereby floated in the water, the closing lid 6 automatically rotates around the rotation shaft 7 so as to close a ventilation port 2a.