公开(公告)号：US20200166059A1

公开(公告)日：2020-05-28

申请号：US16516869

申请日：2019-07-19

Applicant: Hamilton Sundstrand Corporation

Inventor： Maciej Bujewicz ,  Marcin Korczynski

IPC: F15B13/043 ,  F16K1/18 ,  F16K31/00

Abstract: A hydraulic servo valve is described herein comprising a servovalve body with first and second nozzles and a flapper provided therein, wherein said flapper is a bimorph piezoelectric flapper and comprises: a first layer of piezoelectric material and a second layer of piezoelectric material. The servovalve further comprises means for providing a positive voltage to one of said first and second layers and a negative voltage to the other of said first and second layers, and the flapper extends longitudinally between a first end and a second end. The second end of said flapper is positioned so as to be between said first and second nozzles so that said first layer faces said first nozzle and said second layer faces said second layer.