A magnetic coupling system may be used in a fluid displacement apparatus to magnetically couple a drive shaft to a piston. The magnetic coupling system may include first and second magnetic couplers at the ends of the drive shaft and piston, respectively. The second magnetic coupler is configured to...http://www.google.es/patents/US7690293?utm_source=gb-gplus-sharePatente US7690293 - Coupling system for use with fluid displacement apparatus
Coupling system for use with fluid displacement apparatus
