Device for controlling fluid flow

A device for controlling flow of a fluid through a conduit from an upstream side of the device to a downstream side of the device, the device comprising:

• an upstream valve casing defining an inlet on the upstream side of the device;
• a downstream valve casing defining an outlet aperture on the downstream side of the device;
• a valve core secured between the upstream valve casing and the downstream valve casing;
• wherein the upstream valve casing, the downstream valve casing and the valve core are formed as discrete parts;
• and
• wherein the valve core comprises a housing defining a control volume;
• a valve member movably mounted on the housing and positioned on the upstream side of the outlet aperture;
• wherein the valve member is arranged to move reciprocally to selectively open and close the outlet aperture, thereby controlling the flow of the fluid through the outlet aperture;
• an input line defined in the valve core for introducing a fluid pressure into the control volume;
• wherein the valve member is acted on by the fluid pressure in the control volume to control a position of the valve member;
• and
• a magnet, embedded within the valve member such that the magnet is displaced by the movement of the valve member in the same direction as the valve member;
• and
• a position sensor arranged to determine the position of the valve member;
• wherein the position sensor comprises one or more multiple-axis magnetic field sensors;
• and
• wherein the valve core comprises one or more cavities, extending from an exterior surface of the valve core, in which the one or more multiple-axis magnetic field sensors are located.