BIDIRECTIONAL FORCE FEEDBACK POPPET VALVE

摘要

A valve has a valve body ( 12) including a main chamber (14) having a first port (16) and a second port (18), and a main poppet (20) disposed within the main chamber. The main poppet includes a first surface (28) forming a control chamber (30) within the main chamber. The valve has a first passage (40) communicating the control chamber with the first port, and a second passage (50) communicating the control chamber with the second port. The valve also includes a pilot valve (80) having a pilot poppet (82) for controlling fluid flow from the control chamber to the first port through a third passage (96), and to the second port through a fourth passage (102), respectively. The valve may further have a feedback spring (90) coupled between the main poppet and the pilot poppet to provide a force relative to a distance between the main poppet and the pilot poppet.