Temperature variations in automotive transmissions change the viscosity of automatic transmission fluid, causing hesitations during shifting. To eliminate this, a thermostat metal valve varies its orifice dimensions as a function of fluid temperature to control fluid flow and maintain constant pressure. Benefits include precise control of the orifice and inherent re-peatability. This simple, trouble-free, cost effective sensing and actuating technology has many potential applications in hydraulic and lubrication systems, as well as in power transmission.
