04525695 is referenced by 29 patents and cites 5 patents.

A direct drive valve wherein a force motor (10) controls the position of a valve slide (20) through a linkage (14). The force motor includes a spring assembly (62) having cantilevered springs (68 and 70) that include petals (72). The armature (48) of the force motor is guided by a plurality of balls (84) that contact both an internal tube assembly (47) and the armature.

Title
Force motor with ball mounted armature
Application Number
6/596489
Publication Number
4525695
Application Date
April 4, 1984
Publication Date
June 25, 1985
Inventor
Ray A York
Villa Park
CA, US
Shih Y Sheng
Santa Ana
CA, US
Agent
Frederick L Tolhurst
Assignee
Parker Hannifin Corporation
OH, US
IPC
H01F 7/08
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