Abstract: An in-valve mountable mixing device, the device being configured to fit within an outlet port of a mixing valve and to positively engage with the mixing valve to prevent rotation of the mixing device within the valve when mounted. The device includes one or more vanes adapted to induce swirl into a fluid passing through the outlet port. In a second aspect the invention could be said to be a mixing valve adapted to receive or house such a mixing device in its outlet port and to hold it in such a manner that the device cannot rotate within the body of the valve.

Abstract: A control valve has a valve body and a flow control element preferably in the form of a disc, the valve body defining at least one inlet passage, the inlet passage culminating in an opening which is surrounded at least partially by a flow control surface, and the flow control element is so arranged as to be able to pass close to the flow control surface and across the opening to adjust the flow rate of at least one fluid which is caused to pass through the valve body, wherein the flow control element is constrained within the valve body by a stopping member, the stopping member being adapted to allow a positive clearance to exist between the flow control element and the flow control surface. The stopping member is preferably adjustable, allowing the positive clearance to be adjusted.

Abstract: A sensing arrangement for sensing one or more properties of a fluid is provided. The sensing arrangement includes a fluid flow path (3) and a sensing means (5) to sense one or more properties of the fluid. The sensing means (5) is positioned or positionable within the fluid flow path (3). In use, the sensing arrangement directs the fluid in a substantially spiral flow (2) within the fluid flow path (3) past the sensing means (5). Also provided is a method of sensing one or more properties of a fluid and a fluid system for controlling one or more properties of a fluid.