Multi-fluid precision calibration pressure source
First Claim
Patent Images
1. A portable calibration pressure device configured to generate vacuum and pressure, said calibration pressure device comprising:
- a pump having an inlet and an outlet;
a manifold fluidly connected to the pump;
a reservoir fluidly connected to the pump; and
a selector valve configured for operation at pressures up at about 10,000 psi, the selector valve comprising;
a selector valve housing comprising a plurality of ports;
a spool positioned at least partially within the selector valve housing and configured to move axially within the selector valve housing from a first position to a second position, the spool comprising at least two recessed sections;
a plurality of spacer bushings positioned within the selector valve housing, wherein each port is adjacent a spacer bushing and the spacer bushings adjacent each port comprise at least one radial hole;
a plurality of sealing elements, at least one sealing element positioned between adjacent spacer bushings, the plurality of sealing elements configured to seal against an outer diameter of the spool;
a first fluid volume between a first recessed section of the spool and interior surfaces of the sealing elements and spacer bushings;
a second fluid volume between a second recessed section of the spool and interior surfaces of the sealing elements and spacer bushings; and
a cam unit configured to be grasped and rotated by a user, the cam unit comprising a notch that receives a pin that is rigidly connected with the spool, wherein the rotation of the cam unit moves the pin which in turn moves the spool within the selector valve housing;
the selector valve configured such that;
when the spool is in the first position, the reservoir fluidly communicates through one of the first and second fluid volume to the pump inlet and the manifold fluidly communicates through the other of the first and second fluid volume to the pump outlet, andwhen the spool is in the second position, the reservoir fluidly communicates through one of the first and second fluid volume to the pump outlet and the manifold fluidly communicates through the other of the first and second fluid volume to the pump inlet.
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Accused Products
Abstract
A pressure calibration device can include certain features that allow it to be used with a variety of hydraulic and pneumatic systems. A pressure calibration device can be configured to provide pressure or vacuum, and can have a mode selector for selecting to provide pressure or vacuum. A pressure calibration device can have a volume adjuster configured to modify pressures for hydraulic or pneumatic systems. A pressure calibration device can have a pressure release valve and a bleed valve for adjusting pressure values.
54 Citations
35 Claims
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1. A portable calibration pressure device configured to generate vacuum and pressure, said calibration pressure device comprising:
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a pump having an inlet and an outlet; a manifold fluidly connected to the pump; a reservoir fluidly connected to the pump; and a selector valve configured for operation at pressures up at about 10,000 psi, the selector valve comprising; a selector valve housing comprising a plurality of ports; a spool positioned at least partially within the selector valve housing and configured to move axially within the selector valve housing from a first position to a second position, the spool comprising at least two recessed sections; a plurality of spacer bushings positioned within the selector valve housing, wherein each port is adjacent a spacer bushing and the spacer bushings adjacent each port comprise at least one radial hole; a plurality of sealing elements, at least one sealing element positioned between adjacent spacer bushings, the plurality of sealing elements configured to seal against an outer diameter of the spool; a first fluid volume between a first recessed section of the spool and interior surfaces of the sealing elements and spacer bushings; a second fluid volume between a second recessed section of the spool and interior surfaces of the sealing elements and spacer bushings; and a cam unit configured to be grasped and rotated by a user, the cam unit comprising a notch that receives a pin that is rigidly connected with the spool, wherein the rotation of the cam unit moves the pin which in turn moves the spool within the selector valve housing; the selector valve configured such that; when the spool is in the first position, the reservoir fluidly communicates through one of the first and second fluid volume to the pump inlet and the manifold fluidly communicates through the other of the first and second fluid volume to the pump outlet, and when the spool is in the second position, the reservoir fluidly communicates through one of the first and second fluid volume to the pump outlet and the manifold fluidly communicates through the other of the first and second fluid volume to the pump inlet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A portable calibration pressure device configured to generate vacuum and pressure, said calibration pressure device comprising:
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a pump having an inlet and an outlet; a manifold fluidly connected to the pump; a reservoir fluidly connected to the pump; and a selector valve configured for operation at pressures up at about 10,000 psi, the selector valve comprising; a selector valve housing comprising a plurality of ports; a spool positioned at least partially within the selector valve housing and configured to move axially within the selector valve housing from a first position to a second position, the spool comprising a first recessed section and a second recessed section; the first recessed section comprising a first tapered portion, a second tapered portion, and an intermediate portion, the intermediate portion being located longitudinally between the first and second tapered portions, the intermediate portion comprising a generally constant diameter; the first tapered portion and the intermediate portion each having a longitudinal length, the longitudinal length of the first tapered portion being greater than the longitudinal length of the intermediate portion; a plurality of spacer bushings positioned within the selector valve housing, wherein each port is adjacent a spacer bushing and the spacer bushings adjacent each port comprise at least one radial hole; a plurality of sealing elements, at least one sealing element positioned between adjacent spacer bushings, the plurality of sealing elements configured to seal against an outer diameter of the spool; a first fluid volume between a first recessed section of the spool and interior surfaces of the sealing elements and spacer bushings; a second fluid volume between a second recessed section of the spool and interior surfaces of the sealing elements and spacer bushings; and a cam unit configured to be grasped and rotated by a user, the cam unit comprising a notch that receives a pin that is rigidly connected with the spool, wherein the rotation of the cam unit moves the pin which in turn moves the spool within the selector valve housing; the selector valve configured such that; when the spool is in the first position, the reservoir fluidly communicates through one of the first and second fluid volume to the pump inlet and the manifold fluidly communicates through the other of the first and second fluid volume to the pump outlet, and when the spool is in the second position, the reservoir fluidly communicates through one of the first and second fluid volume to the pump outlet and the manifold fluidly communicates through the other of the first and second fluid volume to the pump inlet. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A portable calibration pressure device configured to generate vacuum and pressure, said calibration pressure device comprising:
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a pump having an inlet and an outlet; a manifold fluidly connected to the pump; a reservoir fluidly connected to the pump; and a selector valve configured for operation at pressures up at about 10,000 psi, the selector valve comprising; a selector valve housing comprising a plurality of ports; a spool positioned at least partially within the selector valve housing and configured to move axially within the selector valve housing from a first position to a second position, the spool comprising a first recessed section and a second recessed section; the first recessed section comprising a first tapered portion, a second tapered portion, and an intermediate portion, the intermediate portion being located longitudinally between the first and second tapered portions; the first tapered portion tapering from a first diameter to a second diameter, the first diameter being greater than the second diameter; the first tapered portion having a longitudinal length that is greater than the first diameter of the first tapered portion; a plurality of spacer bushings positioned within the selector valve housing, wherein each port is adjacent a spacer bushing and the spacer bushings adjacent each port comprise at least one radial hole; a plurality of sealing elements, at least one sealing element positioned between adjacent spacer bushings, the plurality of sealing elements configured to seal against an outer diameter of the spool; a first fluid volume between a first recessed section of the spool and interior surfaces of the sealing elements and spacer bushings; a second fluid volume between a second recessed section of the spool and interior surfaces of the sealing elements and spacer bushings; and a cam unit configured to be grasped and rotated by a user, the cam unit comprising a notch that receives a pin that is rigidly connected with the spool, wherein the rotation of the cam unit moves the pin which in turn moves the spool within the selector valve housing; the selector valve configured such that; when the spool is in the first position, the reservoir fluidly communicates through one of the first and second fluid volume to the pump inlet and the manifold fluidly communicates through the other of the first and second fluid volume to the pump outlet, and when the spool is in the second position, the reservoir fluidly communicates through one of the first and second fluid volume to the pump outlet and the manifold fluidly communicates through the other of the first and second fluid volume to the pump inlet. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification