Abstract: A single lever valve for mixing hot and cold liquids has a mixer which can internally impose an upper limit on the temperature of any liquid emerging from it. The means used may enable the upper limit to be changed by exchange of a component so that the mixer can be used in any location in an installation even though different locations might have different upper limit requirements. The mixer may take the form of a cartridge able to be exchanged with an existing cartridge to convert an “unsafe” mixer to a “safe” one.

Abstract: A single lever valve for mixing hot and cold liquids has a mixer which can internally impose an upper limit on the temperature of any liquid emerging from it. The means used may enable the upper limit to be changed by exchange of a component so that the mixer can be used in any location in an installation even though different locations might have different upper limit requirements. The mixer may take the form of a cartridge able to be exchanged with an existing cartridge to convert an “unsafe” mixer to a “safe” one. There is a cylindrical mixing chamber with hot and cold liquid entry through ports through the side walls at opposite ends. A piston sealingly slidable within the chamber effects opening and closing of the ports.

Abstract: A single lever valve for mixing hot and cold liquids has a mixer which can internally impose an upper limit on the temperature of any liquid emerging from it. The means used may enable the upper limit to be changed by exchange of a component so that the mixer can be used in any location in an installation even though different locations might have different upper limit requirements. The mixer may take the form of a cartridge able to be exchanged with an existing cartridge to convert an “unsafe” mixer to a “safe” one. An adjustment means is provide enabling the upper temperature limit cut-off to be accurately set—even before assembly of the mixer.

Abstract: The present invention provides a pressure compensating device through which two separate fluid streams flow separated by a diaphragm. The flow of fluid on one side if the diaphragm is unimpeded while flow on the other side of the diaphragm is controlled as a result of movement of the diaphragm caused by pressure differentials.