Plug valve with liner

• US 4,215,847 A
• Filed: 09/06/1977
• Issued: 08/05/1980
• Est. Priority Date: 09/06/1977
• Status: Expired due to Term

• Current Assignee: Crane-Aloyco Incorporated
• Original Assignee: Pieter F. Hoos
• Inventors: Hoos, Pieter F.
• Primary Examiner(s): Cline, William R.
• Assistant Examiner(s): Spiegel, H. Jay
• Application Number:
  US05/830,741
• Time in Patent Office: 1,064 Days
• Field of Search: 251/309, 251/317, 251/360, 251/316, 277/171
• US Class Current: 251/317
• CPC Class Codes: F16K 5/0271 between housing and plug
• CPC Class Codes: F16K 5/0471 between housing and plug

Abstract

A plug valve comprising a body with a cylindrical or conical cavity to receive a sealing liner and a complementary plug. A pair of vertically disposed, parallel ribs extend inward from the surface of the body cavity along each side of each flow passageway forming between them a dovetail groove which increases in radial depth from adjacent the top of the body port to a level near the bottom thereof. The outer surface of the liner has a vertical groove spaced from each side of the flow port therein to form, with such flow port sides, vertical dovetail which are secured between the ribs simply by pressing the liner down into the body cavity. The ports in the plug and liner are rectangular, whereby when conical, the lower portion of the flow passages and ports encompass a greater circumferential angle than do the upper portions. Hence, initial flow when the valve opens is at the lower portion where the dovetail interlock is greatest.

Claims

1. A plug valve comprising:

a body with a cavity of generally circular horizontal cross-sections therein;

flow passages in said body terminating in body ports at said cavity;

a complementary plug in said cavity for rotational movement therein; and

a flow passageway through said plug;

a pre-formed liner of yieldable material in said cavity receiving said plug;

said body having complete annular, top and bottom surfaces within and around said cavity; and

said top surface being larger in diameter than said bottom surface;

a pair of generally parallel, substantially axial ribs extending between said top and bottom surfaces on each side of each body port;

opposing sides of each pair of said ribs forming between them an axial dovetail groove;

the inner surface of said cavity intermediate said ribs merging with said top and bottom surfaces;

said liner having annular top and bottom sealing bands received in said top and bottom surfaces of the body; and

complementary axial dovetail seal strips received between each of said pairs of ribs to form a radially retained positive interlock therewith, said seal strips interconnecting said sealing bands with the outer surfaces thereof merging therewith;

said grooves and said ribs being vertically disposed so that said liner may be inserted axially into said cavity with said seal strips and said ribs interlocked; and

spaces between said pairs of seal strips defining port openings;

the inner surfaces of said sealing bands and seal strips engaging said plug.

2. The plug valve defined by claim 1 wherein:

said ribs increase in radial thickness from said top sealing surface to a level near the bottoms of said port opening.

3. The plug valve defined by claim 2 wherein:

said plug is of frusto-conical configuration; and

said plug flow passageway has generally planar side walls parallel to the axis of said plug.

the opening of said flow passageway encompassing a maximum circumference angle of the plug at about said level so that the covering of said flow passageway by a seal strip during rotation of said plug is progressive.

4. The plug valve defined by claim 2 wherein:

the inner surface of said cavity intermediate said ribs is approximately cylindrical from said top sealing surface down to said level and then tapers in to merge with said bottom surface; and

the inner surfaces of said ribs are frusto conical from said top sealing surface down to about said level.

5. The plug valve defined by claim 1 wherein:

said liner is substantially continuous between said seal strips on each side of each of said port openings; and

including;

vertical depressions adjacent said seal strips received on said body ribs, each forming one side of a dovetail seal strip.

6. The plug valve defined by claim 5 wherein:

said continuous portion between said depressions on each side of said port openings is thinner than said seal strips.

7. The plug defined by claim 1 wherein:

said liner is of a material which is sufficiently rigid that assembly is facilitated by axial insertion thereof into said cavity.

8. The plug valve defined by claim 1 wherein:

said plug is of frusto-conical configuration; and

said plug flow passageway and said body ports are complementary and encompass a greater circumferential angle of the plug at the lower end of the flow passageway than at the upper end thereof; and

said ribs increase in radial thickness from said upper end of the flow passageway to a level near said lower end.

9. The plug valve defined by claim 1 wherein:

said plug and the inner surfaces of said ribs are frusto-conical; and

said body ports and flow passageway are generally rectangular.

10. The plug valve defined by claim 1 wherein:

all said opposing sides of the ribs are situated on vertical planes.

11. The plug valve defined by claim 10 wherein said vertical planes are parallel to the axis of said cavity.