A valve with a smart handle including a memory module to log relevant data. A sensor on the handle determines when the valve is open, and this triggers the start of timers and recording of the “open” event in a log in the memory module. When the valve is closed, the sensor triggers stopping of the...http://www.google.com.hk/patents/US7114510?utm_source=gb-gplus-share專利 US7114510 - Valve with smart handle
