Permanently instrumented actuated valve assembly, with internally-gauged, permanently instrumented shaft

• US 6,240,789 B1
• Filed: 05/11/1999
• Issued: 06/05/2001
• Est. Priority Date: 05/15/1998
• Status: Active Grant

• Current Assignee: Crane Nuclear, Inc. (Crane Company)
• Original Assignee: Crane Nuclear, Inc. (Crane Company)
• Inventors: Smith, Christopher P., Morlan, David E.
• Primary Examiner(s): NOORI, MAX H
• Application Number:
  US09/309,636
• Time in Patent Office: 756 Days
• Field of Search: 731/68, 738/620.8, 738/623.23, 738/623.81, 738/624.9, 738/625.82, 738/625.83
• US Class Current: 73/862.582
• CPC Class Codes: F16K 37/0083 by measuring valve parameters
• CPC Class Codes: G01B 5/30 for measuring the deformation in a solid, e.g. mechanical strain gauge
• CPC Class Codes: G01L 5/0061 Force sensors associated with industrial machines or actuators for the specific machine or actuator involved see relevant class, e.g. F01, F04, F16, B66, E21

Abstract

A permanently instrumented actuated valve assembly includes at least one internally-gauged, permanently instrumented shaft functioning as a load bearing component through which an actuator drives a valve element. The shaft has a longitudinal (preferably axial), internal bore generally extending from the one end of the shaft to a point therewithin. A thrust monitoring instrument is mounted within the axial bore and monitors axial forces acting on the shaft to provide an indication of the performance of the valve assembly. Alternatively, one or more transverse bores extending from the internal bore to the external surface of the valve stem are provided with torsional force monitoring instruments being received within such transverse bore(s).

Claims

1. A valve assembly, comprising:

a valve stem having a cylindrical body having a first end and a second end, a valve seal mounted to said second end, and an internal bore formed within said valve stem and extending from said first end of said body to an intermediate point within said valve stem;

a monitoring instrument received within said internal bore for monitoring internal strains acting on said valve stem and generating signals indicative of the monitored parameters of said valve stem;

means for moving said valve stem to open and close the valve assembly; and

receiving means for receiving signals from said monitoring instrument to indicate the condition of said valve stem.

2. The valve assembly of claim 1, wherein said means for moving said valve stem comprises a drive motor.

3. The valve assembly of claim 1 and wherein said means for moving said valve stem comprises a pneumatic actuator.

4. The valve assembly of claim 1 wherein said monitoring instrument monitors the thrust load on said valve stem.

5. The valve assembly of claim 1, wherein said valve stem further includes, at least one transverse bore extending from said internal bore to an exterior surface of said valve stem.

6. The valve assembly of claim 5, further comprising a second monitoring instrument received within said transverse bore, said second instrument generating signals indicative of desired monitored parameters of said valve stem.

7. The valve assembly of claim 6, wherein said second monitoring instrument monitors the torsional forces on said body.

8. The valve assembly of claim 1, and further including a receiving means in communicative connection with monitoring instrument and said means for moving said valve stem for receiving said signals from said monitoring instrument and controlling said means for moving, whereby said means for moving said valve stem moves said valve stem to selectively open and close the valve upon receipt of predetermined signals from said monitoring instrument.