Two-stage closed center electro-hydraulic valve

• Main Authors: KOPP JOHN, MAZURKIEWICZ CHRISTOPHER
• Format: Patent
• Language: Chinese; English
• Published: 13.10.2017
• Subjects: BLASTING; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; HEATING; HYDRAULICS OR PNEUMATICS IN GENERAL; LIGHTING; MECHANICAL ENGINEERING; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; WEAPONS

A servovalve (15) comprising a motor (16), a motor bias mechanism (20), a first stage valve member (22) adapted to be moved from a first position to a first off-null position, a second stage member (29) adapted to be moved from a first position to a second position with movement of the first valve member (22), a transfer link (34) acting between the first (22) and second (29) valve members, an eccentric drive member (35) acting between the motor (16) and transfer link (34), the transfer link (34) and drive member (35) configured such that selective movement of the motor (16) causes the transfer link (34) to move the first valve member (22), movement of the first valve member (22) causes the second valve member (29) to move, and movement of the second valve member (29) causes the transfer link (34) to move the first valve member (22) from the first off-null position back to the null position. 种伺服阀(15)，所述伺服阀包括：马达(16)；马达偏置机构(20)；第级阀构件(22)，其适于从第位置移动到第非零位置；第二级构件(29)，其适于随着第阀构件(22)的移动从第位置移动到第二位置；传递连杆(34)，其作用在第阀构件(22