In a device including a first calibrated or adjustable orifice and a second orifice located downstream of the first orifice, the opening of the second orifice is adjusted by a valve whereof the position is controlled by apparatus displacing the valve depending on the pressure difference prevailing between...http://www.google.fr/patents/US6394361?utm_source=gb-gplus-shareBrevet US6394361 - Device for automatically balancing a liquid-based heat-transfer system
Device for automatically balancing a liquid-based heat-transfer system
