The invention relates to flush valves in which an external operating handle is eliminated. An electronic sensor, solenoid valve and a solenoid contained within a single unit to operate a flush valve are provided which is either built into the flush valve or can be retrofitted to a conventional flush...http://www.google.es/patents/US4793588?utm_source=gb-gplus-sharePatente US4793588 - Flush valve with an electronic sensor and solenoid valve
Flush valve with an electronic sensor and solenoid valve
