A valve positioner system that includes one or more unique control methods and devices, including several routines to facilitate the continuous maintenance, calibration and adjustment requirements of the valve. The positioner system may utilize pressure and position feedback signals to monitor the valve....http://www.google.fr/patents/US20010037159?utm_source=gb-gplus-shareBrevet US20010037159 - Valve positioner system
Numéro de demande: 09/832,403 Numéro de publication: US 2001/0037159 A1 Date de dépôt: 10 avr. 2001 Brevet délivré: US6745084 ( Date de délivrance 1 juin 2004)
