Control valve

Patent metadata

Field	Value
Publication number	US-10948089-B2
Application number	US-201816151630-A
Country	US
Kind code	B2
Filing date	Oct 4, 2018
Priority date	Oct 6, 2017
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

The invention relates to a control valve for adjusting a process fluid flow of a process plant, comprising a valve housing ( 4 ) with a valve seat ( 10 ) and a valve piston ( 12 ) connected to a valve rod ( 14 ), which valve piston ( 12 ) interacts with the valve seat ( 10 ) for opening and closing the control valve ( 2 ). The invention is characterized in that, for connecting the valve rod ( 14 ) to the valve piston ( 12 ), a flange ( 22 ) is mounted on the valve rod ( 14 ), which flange ( 22 ) is screwed to the valve piston ( 12 ) via plural threaded connecting elements ( 34; 48 ).

First claim

The invention claimed is:

1. Control valve for adjusting a process fluid flow of a process plant, comprising:
a valve housing ( 4 ) with a valve seat ( 10 ) and a valve piston ( 12 ) connected to a valve rod ( 14 );
said valve piston ( 12 ) interacts with said valve seat ( 10 ) for opening and closing said control valve ( 2 );
said valve rod ( 14 ) is threaded ( 26 ) and connected to a flange ( 22 ), said flange ( 22 ) is mounted on and connected to said valve piston ( 12 ) by a plurality of threaded connecting elements ( 34 );
at least one tangentially aligned threaded rod ( 68 ) is adapted to engage a recess ( 70 ) in said valve rod ( 14 ), said recess is delimited by a secant to the valve rod ( 14 ), said threaded rod ( 68 ) being screwed into a threaded hole ( 72 ) through said annular shoulder ( 52 ) of said flange ( 22 ).

2. Control valve for adjusting a process fluid flow of a process plant, comprising:
a valve housing ( 4 ) with a valve seat ( 10 ) and a valve piston ( 12 ) connected to a valve rod ( 14 );
said valve piston ( 12 ) interacts with said valve seat ( 10 ) for opening and closing said control valve ( 2 );
said valve rod ( 14 ) is threaded ( 26 ) and connected to a flange ( 22 ), said flange ( 22 ) is mounted on and connected to said valve piston ( 12 ) by a plurality of threaded connecting elements ( 34 );
external teeth ( 74 ) on said valve rod ( 14 ) engage matching internal teeth of a ring gear ( 76 ) of said flange ( 22 );
a locking pin ( 78 ), said locking pin resides in said valve piston ( 12 ) and engages a recess of said ring gear ( 76 ) of said flange ( 22 ) thus locking said ring gear ( 76 ) with respect to said piston ( 12 ), and said external teeth of a toothed section ( 74 ) of said valve rod ( 14 ) engages in said internal teeth of said ring gear ( 76 ).

3. The control valve according to claim 1 , further comprising:
said connecting elements ( 34 ) are distributed on a bolt circle on said flange ( 22 ).

4. The control valve according to claim 1 , further comprising:
said flange ( 22 ) has threaded holes ( 44 );
a piston crown ( 24 ) has holes ( 46 ) aligned with said threaded holes ( 44 ) in said flange ( 22 ); and,
a plurality of threaded connecting members ( 48 ) resides in said holes ( 46 ) and engage said threaded holes ( 44 ) in said flange affixing said valve piston ( 12 ) to said valve rod ( 14 ).

5. The control valve according to claim 1 , further comprising:
said flange ( 22 ) has bores ( 30 );
a piston crown ( 24 ) has threaded holes ( 32 ) aligned with said bores ( 30 ) in said flange ( 22 ), and,
said threaded connecting elements ( 34 ) engage said threaded holes ( 32 ) affixing said flange ( 22 ) to said piston crown ( 24 ).

6. The control valve according to claim 1 , further comprising:
said flange ( 22 ) is fixed to said valve rod ( 14 ) by a weld joint ( 36 ), said weld joint ( 36 ) comprising at least one weld seam in the form of a weld bead, and/or a weld spot.

7. The control valve according to claim 6 , further comprising:
said flange ( 22 ) has an annular shoulder, and that said at least one welded weld joint ( 36 ) fixes said flange ( 22 ) to said valve rod ( 14 ).

8. The control valve according to claim 1 , further comprising:
said valve piston ( 12 ) includes a central fitting bore ( 40 );
said valve rod ( 14 ) is centered relative to said valve piston ( 12 ) using said central fitting bore ( 40 ) in said valve piston ( 12 ) and a cylindrical shoulder on said valve rod ( 14 ).

9. The control valve according to claim 1 , further comprising:
said flange ( 22 ) and said valve piston ( 12 ) are secured against rotation by at least one pin ( 38 ) inserted in respective bores ( 37 , 39 ) in said flange ( 22 ) and in a piston crown ( 24 ), respectively, whereby threaded holes ( 32 ) and associated bores ( 30 ) in said flange are in alignment with one another.

10. The control valve according to claim 1 , further comprising:
a centering cone ( 50 ) on said valve rod ( 14 ) and a conical bore ( 51 ) on said flange ( 22 ), said centering cone ( 50 ) is clamped against said conical bore ( 51 ), and, said valve rod ( 14 ) is affixed to said flange ( 22 ).

11. The control valve according to claim 1 , further comprising:
a snap ring ( 56 ) resides in grooves ( 58 , 60 ) on said valve rod ( 14 ) and/or on said annular shoulder ( 52 ) of said flange ( 22 ).

12. The control valve according to claim 1 , further comprising:
at least one radially aligned grub screw ( 62 ) engages a respective groove ( 64 ) on said valve rod ( 14 ).

Assignees

• Samson Ag

Inventors

• Graenz Daniel
• Jantz Johannes
• Merscher Michael
• Reinthaler Andreas
• Welsch Tobias

Classifications

• F16K3/267 Primary

  Combination of a sliding valve and a lift valve (F16K3/262, F16K3/265 take precedence) · CPC title

• F16K3/314

  Forms or constructions of slides; Attachment of the slide to the spindle · CPC title

• F16K1/487 Primary

  by a fixing element extending in the axial direction of the spindle, e.g. a screw · CPC title

• F16K1/482 Primary

  with a collar on the spindle or a groove in the spindle, by which a fixing element is supported, the spindle reaching into the valve member · CPC title

• F16B9/052

  the intermediate member having a radial flange secured to the flat surface · CPC title