Valve seat and cage assembly

Patent metadata

Field	Value
Publication number	US-11143311-B2
Application number	US-202016798360-A
Country	US
Kind code	B2
Filing date	Feb 22, 2020
Priority date	Feb 22, 2019
Publication date	Oct 12, 2021
Grant date	Oct 12, 2021

Abstract

The invention relates to a valve seat and cage assembly (18) comprising a valve cage (20) and a valve seat (22), the valve seat (22) being adapted to be screwed into the valve cage (20), which valve cage (20), in a connection portion (34) thereof, has a valve cage connection inner diameter (DK) in which the connection portion (32) of a valve seat (22) engages with its valve seat connection outer diameter (DV) and thus provides radial centering, a screw connection portion (37) and a shoulder (38), with the shoulder (38) serving as an axial stop between the valve cage and the valve seat, and with the valve seat (22) and the valve cage (20) being pressed against one another with an axial contact pressure component. The invention is characterized in that the screw-connection portion is located between the connection portion (32) and a shoulder (38), with the valve cage connection inner diameter (DK) and the valve seat connection outer diameter (DV) forming a fit with one another that will act to center the valve seat and the valve cage.

First claim

The invention claimed is:

1. Valve seat and cage assembly ( 18 ), comprising:
a valve cage ( 20 ) and a valve seat ( 22 );
said valve seat ( 22 ) is threaded ( 36 ) into said valve cage ( 20 );
said valve cage ( 20 ) includes a threaded connection portion ( 34 );
said valve cage ( 20 ) threaded connection portion ( 34 ) has an inner diameter (DK);
said valve seat ( 22 ) includes a threaded connection portion ( 32 );
said valve seat ( 22 ) threaded connection portion ( 32 ) includes an outer diameter (DV);
said inner diameter (DK) of said valve cage threaded connection portion ( 34 ) is threaded to said outer diameter (DV) of said threaded connection portion ( 32 ) of said valve seat ( 22 ) forming a threaded connection portion ( 37 ) which thus provides radial centering;
said valve seat ( 22 ) includes a first sealing shoulder ( 38 ) engaging said valve cage ( 20 ) acting as an axial stop and acting as a metal to metal seal between said valve cage ( 20 ) and said valve seat ( 22 );
said valve seat ( 22 ) includes a second sealing shoulder ( 44 ) adjoining and axially spaced from said first sealing shoulder ( 38 );
a recess ( 40 ), said recess has a first portion formed between said second sealing shoulder ( 44 ) and said valve seat ( 22 ), and, a second portion formed wherein said valve cage ( 20 ) has an outer wall and a portion of said outer wall of said valve cage ( 20 ) has a reduced wall thickness radially recessed inwardly from said outer wall of said valve cage ( 20 );
a seal ( 24 ) resides in said recess ( 40 ), said seal ( 24 ) includes a first portion in the form of a flange-like collar ( 42 ) extending radially inwardly toward said metal to metal seal between said valve cage ( 20 and said valve seat ( 22 ), said second sealing shoulder ( 44 ) holds said flange-like collar ( 42 ) of said seal ( 24 ) between said valve seat ( 22 ) and said valve cage ( 20 ) thus fixing said seal ( 24 ) in said first portion of said recess thus fixing said seal ( 24 ) radially and axially;
said seal ( 24 ) further includes a second portion thereof having an opening which extends between said second portion of said recess ( 40 ) formed wherein said valve cage ( 20 ) has an outer wall and a portion of said outer wall of said valve cage ( 20 ) has a reduced wall thickness radially recessed inwardly from said outer wall of said valve cage ( 20 );
said valve seat ( 22 ) and said valve cage ( 20 ) being pressed against one another with an axial contact pressure force component;
said threaded connection portion ( 37 ) is located between said threaded connection portion ( 32 ) of said valve seat ( 22 ), said threaded connection portion ( 34 ) of said valve cage ( 20 ), and said shoulder ( 38 ) of said valve seat ( 38 ); and,
said valve cage ( 20 ) connection portion ( 34 ) inner diameter (DK) and said valve seat ( 22 ) connection portion ( 32 ) outer diameter (DV) forming a fit with one another that acts to center said valve seat ( 22 ) and said valve cage ( 20 ).

2. Valve ( 10 ), comprising a valve cover ( 14 ), a valve housing ( 12 ), which valve housing ( 12 ) has an inlet connection and an outlet connection, and a transition portion ( 26 ) with a central recess between said inlet connection and said outlet connection, with a valve seat and cage assembly ( 18 ), comprising:
a valve cage ( 20 ) and a valve seat ( 22 );
said valve seat ( 22 ) is threaded ( 36 ) into said valve cage ( 20 );
said valve cage ( 20 ) includes a threaded connection portion ( 34 );
said threaded connection portion ( 34 ) of said valve cage ( 20 ) has an inner diameter (DK);
said valve seat ( 22 ) includes a threaded connection portion ( 32 );
said threaded connection portion ( 32 ) of said valve seat ( 22 ) includes an outer diameter (DV);
said inner diameter (DK) of said valve cage ( 20 ) threaded connection portion ( 34 ) is threaded ( 36 ) to said outer diameter (DV) of said valve seat ( 22 ) threaded connection portion ( 32 ) forming a threaded connection portion ( 37 ) which thus provides radial centering of said valve seat ( 22 ) and said valve cage ( 20 );
said valve seat ( 22 ) includes a shoulder ( 38 ) engaging said valve cage ( 20 ) acting as an axial stop and a metal to metal seal between said valve cage ( 20 ) and said valve seat ( 22 );
said valve seat ( 22 ) and said valve cage ( 20 ) being pressed against one another with an axial contact pressure force component;
said threaded connection portion ( 37 ) is located between said threaded connection portion ( 32 ) of said valve seat ( 22 ) and said shoulder ( 38 );
a recess ( 40 ), said recess has a first portion formed between said second sealing shoulder ( 44 ) and said valve seat ( 22 ), and, a second portion formed wherein said valve cage ( 20 ) has an outer wall and a portion of said outer wall of said valve cage ( 20 ) has a reduced wall thickness radially recessed inwardly from said outer wall of said valve cage ( 20 );
a seal ( 24 ) resides in said recess ( 40 ), said seal ( 24 ) includes a first portion in the form of a flange-like collar ( 42 ) extending radially inwardly toward said metal to metal seal between said valve cage ( 20 and said valve seat ( 22 ), said second sealing shoulder ( 44 ) holds said flange-like collar ( 42 ) of said seal ( 24 ) between said valve seat ( 22 ) and said valve cage ( 20 ) thus fixing said seal ( 24 ) in said first portion of said recess thus fixing said seal ( 24 ) radially and axially;
said seal ( 24 ) further includes a second portion thereof having an opening which extends between said second portion of said recess ( 40 ) formed wherein said valve cage ( 20 ) has an outer wall and a portion of said outer wall of said valve cage ( 20 ) has a reduced wall thickness radially recessed inwardly from said outer wall of said valve cage ( 20 );
said valve cage ( 20 ) threaded connection ( 34 ) inner diameter (DK) and said valve seat ( 22 ) threaded connection ( 32 ) outer diameter (DV) centering said valve seat ( 22 ) and fitted in said valve housing ( 12 ) such that said transition portion ( 26 ) of said valve housing ( 12 ) overlaps said seal ( 24 ); and,
a piston guided within said valve cage ( 20 ), said piston being adapted to assume a sealing position together with said valve seat ( 22 ).

3. Valve seat and cage assembly according to claim 1 , characterized in that said fit between said valve cage ( 20 ) threaded connection portion ( 34 ) inner diameter (DK) and said valve seat ( 22 ) threaded connection portion ( 22 ) outer diameter (DV) is a clearance fit and has a maximum clearance of 0.05 mm.

4. Valve seat and cage assembly according to claim 1 , characterized in that the threaded connection portion ( 32 ) of said valve seat ( 22 ) is arranged on the side of said threaded connection portion ( 37 ) that faces said valve cage ( 20 ).

5. Valve seat and cage assembly according to claim 1 , characterized in that the wall thickness (DW 1 ) of said valve seat ( 22 ) in the threaded connection portion is smaller than the wall thickness (DW 2 ) in said threaded connection portion ( 37 ).

6. Valve seat and cage assembly according to claim 1 , characterized in that the sealing element ( 24 ) is U- or V-shaped in cross-section, and has an opening thereof facing in the direction of the valve cage ( 20 ).

7. Valve seat and cage assembly according to claim 1 , characterized in that said seal ( 24 ) is U- or V-shaped and has an opening thereof facing away from said valve cage ( 20 ).

8. Valve seat and cage assembly according to claim 1 , characterized in that said threaded connection portion ( 32 ) of said valve seat ( 22 ) in the transition to said valve cage ( 20 ) has an inner diameter (DS) which corresponds approximately to the inner diameter (DVK) of said valve cage

Assignees

• Samson Ag

Inventors

• Sander Andreas
• Merscher Michael

Classifications

• F16K3/246

  Combination of a sliding valve and a lift valve · CPC title

• F16K27/02

  of lift valves (for reducing the flow resistance of screw-spindle lift-valves F16K1/06) · CPC title

• F16K1/422 Primary

  attachable by a threaded connection to the housing · CPC title

• F16K1/42 Primary

  Valve seats (for double-seat valves F16K1/44) · CPC title

• F16K25/00

  Details relating to contact between valve members and seats (movement of valve members other than for opening and closing F16K29/00) · CPC title