A mixing valve has a valve housing formed with a seat, a flow-controlling valve cartridge fitted to the seat, and a cover engageable over the cartridge, pivotal on the cartridge about a first axis, and formed with an aperture. A handle engaging through the aperture with the cartridge is pivotal through...http://www.google.co.uk/patents/US5983939?utm_source=gb-gplus-sharePatent US5983939 - Single-control mixing valve
