Servo Valve

摘要

A servo valve includes a valve housing, a piston cylinder disposed in the housing, a piston disposed within the piston cylinder and fluidly connected on a first end to a first fluid pressure pathway and on a second end to a second fluid pressure pathway, a flapper assembly, and a flow control element disposed in the piston cylinder in a portion of the first fluid pressure pathway. The piston is configured to translate axially within the piston cylinder in response to a pressure differential between the first fluid pressure pathway and the second fluid pressure pathway. The fluid flow control element is configured to stop a flow of fluid through the first fluid pressure pathway when the piston engages the third fluid control element.

主权项

1. A servo valve comprising:
a valve housing; a piston cylinder disposed in the housing; a piston disposed within the piston cylinder and fluidly connected on a first end to a first fluid pressure pathway and fluidly connected on a second end to a second fluid pressure pathway, the piston configured to translate axially within the piston cylinder in response to a pressure differential between a first fluid in the first fluid pressure pathway and a second fluid in the second fluid pressure pathway; a flapper assembly including an activation portion and closure portion, said closure portion of the flapper assembly extending from the activation portion, said flapper assembly configured to move said closure portion to engage a first fluid flow control element on the first fluid pressure pathway when the closure portion is in a first position and configured to move said closure portion to engage a second fluid flow control element on the second fluid pressure pathway when the closure portion is in a second position; and a third fluid flow control element disposed in the piston cylinder in a portion of the first fluid pressure pathway, the third fluid flow control element configured to stop a flow of fluid through the first fluid pressure pathway when the piston engages the third fluid control element.