Rotary servo valve
OwnerMarcus B. Leonardinventor
Life of this patent
Estimating the term…
Abstract
A rotary servo valve employs a double-edged blade-like valve gate mounted inside a sleeve having a plurality of valve ports circumferentially distributed around the sleeve at predetermined angular positions. The valve gate is reciprocable from a first to a second position to provide four-way fluid flow patterns to a fluidic actuating device.
Claims17
A servo valve including a valve body, a bore in said valve body, the bore defining a plurality of axially spaced-apart annular chambers for fluid communication respectively, with a fluid source, a fluid sink and the fluid input/output lines of a fluidly-actuated device, comprising:
- a sleeve, having a wall and opposite ends, mounted in the bore, the sleeve wall being pierced by a first and a second group of valve ports, each group including three sets of valve ports, each set of valve ports being aligned axially with a corresponding annular chamber, within each set there being a plurality of valve ports that are circumferentially distributed around the wall of the sleeve at predetermined angular positions relative to a preselected reference;
- a double-edged flow-metering blade that is rotatingly mounted inside the sleeve, the flow-metering blade defining a center land and two sealing lands on opposites sides of the center land and spaced-apart therefrom, for internally partitioning the sleeve into two closed chambers, one group of valve ports opening into each chamber;
- a control member coupled to the flow-metering blade for reciprocating the flow-metering blade between a first angular position and a second angular position through a null reference position for metering a flow of fluid in a selected direction at a desired rate through the input/output lines of said fluidly-actuated device.
A servo valve for metering the flow of fluid through a fluid-actuated device in a selected direction, the valve including a valve body, a longitudinal bore in said valve body, the bore defining a plurality of axially spaced-apart annular chambers that are in fluid communication respectively, with a fluid source, a fluid sink and at least one fluid input line of the fluid-actuated device, comprising:
- a sleeve fitted in the bore, the sleeve including a plurality of sets of valve ports, each set of valve ports being aligned axially with a corresponding annular chamber, within each set there being a plurality of valve ports that are circumferentially distributed around the sleeve at predetermined angular positions relative to a reference line;
- a flow-metering blade that is rotatingly mounted inside the sleeve, the flow-metering blade defining two end lands for internally sealing the opposite ends of the sleeve to define an internal closed chamber;
- a control member coupled to the flow-metering blade for reciprocating the flow-metering blade between a first angular position and a second angular position relative to a null reference line.
A servo valve for metering the flow of fluid to a fluid-actuated device, the valve including a valve body, a longitudinal bore in said valve body, the longitudinal bore defining a plurality of axially spaced-apart annular chambers for fluid communication respectively, with a fluid source, a fluid sink and fluid input/output lines of the fluid-actuated device, comprising:
- a sleeve fitted in the bore, the sleeve including a first and a second group of valve ports, each group of valve ports including a first set, a second set and a third set of valve ports, each set of valve ports being aligned axially with a corresponding annular chamber, within each set there being a plurality of valve ports that are circumferentially distributed around the sleeve at predetermined angular positions relative to a reference;
- a flow-metering blade that is rotatingly mounted inside the sleeve, the flow-metering blade defining a center land and two end lands for internally partitioning the sleeve into two closed chambers, one group of valve ports opening into each chamber;
- longitudinal arcuate valve-gate members secured to portions of the edges of the flow-metering blade and extending away from the lands
- a control member coupled to the flow-metering blade for rotating the flow-metering blade between:
- i) a first angular position for metering fluid through said first set of valve ports of said first group and the third set of valve ports in said second group, and
- ii) a second angular position for metering fluid through said third set of valve ports of said first group and the first set of valve ports of said second group, and
- iii) said first and second positions being rotated by a first preselected angle on opposite sides of a null position, and
- iv) the second set of valve ports of both groups being always open.
A servo valve for metering the flow of fluid to a fluid-actuated device, the valve including a valve body having longitudinal bore, comprising:
- a sleeve having inner and outer walls fitted in the bore, a plurality of axially spaced-apart grooves formed around the outer wall of the sleeve, the grooves in combination with the valve body forming a plurality of annular chambers for fluid communication with a fluid source, a fluid sink and the input/output lines of a fluidly-actuated device,
- the sleeve further including a plurality of sets of valve-port arrays, each set of valve-port arrays being aligned axially with a corresponding annular chamber, within each set there being a plurality of valve port arrays that are circumferentially distributed around the sleeve at predetermined angular positions relative to a reference;
- a flow-metering blade that is rotatingly mounted inside the sleeve, the flow-metering blade defining a center land and two end lands for internally partitioning the sleeve to define two internal closed chambers;
- a control member coupled to the flow-metering blade for reciprocating the flow-metering blade between a first angular position and a second angular position relative to a null reference line.
A servo valve for metering the flow of fluid to a fluid-actuated device, the valve including a valve body having a longitudinal bore, comprising:
- a sleeve having inner and outer walls fitted in the bore, a plurality of axially-spaced-apart grooves formed around the outer wall of the sleeve, the grooves in combination with the valve body forming a plurality of annular chambers for fluid communication with a fluid source, a fluid sink and the input/output lines of a fluidly-actuated device;
- the sleeve further including a three sets of valve port arrays, each set of valve-port arrays being aligned axially with a corresponding annular chamber, within each set there being a plurality of valve port arrays that are circumferentially distributed around the sleeve at predetermined angular positions relative to a reference;
- a flow-metering blade that is rotatingly mounted inside the sleeve, the flow-metering blade defining two end lands for internally sealing the opposite ends of the sleeve to define an internal closed chamber;
- a control member coupled to the flow-metering blade for reciprocating the flow-metering blade between a first angular position and a second angular position relative to a null reference line.
Dependencies are inferred from the claim text.