Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
  • F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
  • F16K5/0663—Packings
  • F16K5/0668—Single packings
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
  • F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
  • F16K5/0626—Easy mounting or dismounting means
  • F16K5/0642—Easy mounting or dismounting means the spherical plug being insertable from one and only one side of the housing

Definitions

• This invention relates to a ball valve of the kind compris ⁇ ing a valve housing in which the valve member of the valve housing is retained between an annular sealing member and an annular retain- ing element mounted through one of the connecting branches of the valve housing .
• Ball valves of the kind referred to above are known where ⁇ in the annular retaining element is screwed into contact against the valve member so as to press the valve member against the annular sealing member with a sealing pressure.
• Ball valves of this kind it has proved to be difficult to secure the optimum sealing pressure between the annular sealing member and the valve member.
• due to unavoidable tolerance variations during the manufacturing of the valves it is not possible by means of such a valve to secure an optimum sealing pressure .
• the ball valve according to the present invention is cha ⁇ racterized by the annular retaining element being secured in the valve housing by being pressed into the housing and by projecting means being provided in the valve housing for engaging the annular retaining element.
• a very wel l defined pressure of abutment is achieved between the valve member and the annular sealing mem ⁇ ber which is independent of tolerance variations from valve to valve.
• the projecting means comprise a circumferential I y extending ridge, seeing that such a ridge is easily manufactured , e . g . by turning . I n order to facilitate the pressing of the annular retaining element into the valve housing
• the ridge preferably according to the invention comprises a sloping surface facing away from the valve member and a steep surface facing the valve member .
• the latter surface wil l secure the retaining element in the pressed-in position .
• the steep surface- may be- positioned in a plane, which extends perpendi ⁇ cular to the axis of the annular retaining element. Thereby a parti ⁇ cu larly well defined securing of the retaining element is obtained .
• the ridge has a sharp edge in order to secure immobility of the retaining element after the pressing-in thereof .
• a further embodiment of the invention is characterized by the annular retaining element consisting of a single piece of a compa ⁇ ratively hard material , e . g . a mixture of suiphonated plastic and teflon reinforced by fibres . Due to the manufacturing of the retain ⁇ ing element in one piece a simple embodiment is obtained and a material of the kind referred to or a corresponding kind has proved to be appropriate due to the fact that such material has a somewhat "slippery" character, and accordingly offers only a small resistance during the pressing-in of the retaining element.
• the invention also relates to a method of mounting a bal l valve comprising a valve housing , wherein the valve member of the valve is retained between an annular sealing member and an annular t retaining element which is introduced through one of the branches of the valve.
• the retaining element is pressed through the branch beyond projecting engagement means until the pressing force reaches a predetermined value corresponding to the sealing pressure aimed at.
• Fig. 1 shows an axia ly extending section through an embodiment of the ball valve according to the invention having branches with soldered pipe pieces
• Fig. 2 shows a section according to section line 11 -I I in
• Fig. 1, fig. 3 shows a picture corresponding to Fig. 1, but without pipe pieces
• Fig. 4 shows an axially extending cross section of another embodiment of the ball valve according to the invention
• Fig. 5 shows an axially extending cross section of a still further embodiment of the ball valve accord ⁇ ing to the invention.
• 1 designates the housing of the valve shown.
• the housing is manufactured from a hexagonal bar, and is provided with two branches 2 and 3 which according to the embodi ⁇ ment illustrated in Figs. 1-3 have smooth inner surfaces for solder ⁇ ing pieces of pipes 5 and 6 which as mentioned have been omitted in Fig. 3.
• the valve plug or member of the ball valve is provided with the reference numeral 8 and consists of a head 9 which by means of a neck 10 is connected with a generally spherical part 11 according to the embodiments illustrated in Figs. 1-4.
• a flow passage 12 is provided in the spheri ⁇ cal part 11 and, accordingly, it will be seen that the valves have been shown in their open position.
• the head 9 is by means of a O-ring 15 sealed with respect to a side opening in the valve housing 1, the wall of the side open ⁇ ing being provided with the reference numeral 16. According to the embodiment illustrated in Figs.1-3 this opening has such a size that the spherical part 11 may pass through the opening, and the head 10 has a corresponding size.
• valve member which is made in one piece may be mounted by being inserted through the side opening.
• the valve member At the end of the valve member 8 facing away from the head 9 the valve member is provided with a projection 17 shaped as a convex lens which extends into a recess 18 in the valve housing .
• the projection 17 and the. recess 18 are shaped in such a way that they al low a rotation of the valve member 8 from the open position illustrated on the drawing and to closed position , viz. rotated 90 with respect: to the position shown . Accordingly, the projection 17 and the recess 18 form end stops for the movement of the valve member.
• a blind hole 20 having engagement surfaces for a corres- pondingly shaped tool is provided in the head 9 for rotating the valve member .
• valve member 8 is retained in the valve housing between an annular sealing member 21 and an annular retaining element 22.
• the sealing member 21 is positioned in a recess 24 which faces towards the valve member 8.
• the retaining element 22 is pres ⁇ sed into the valve- housing, viz . in the- case concerned through the branch 3.
• the valve housing is internal ly provided with projecting means which according to the embodiments shown on the drawing are shaped as a ridge 23.
• the surface of the ridge 23 facing away from the valve member 8 slopes conical ly outwardly in direction away from the valve member 8 whereby the pressing-in of the annular retaining element 22 is facilitated .
• the surface of the ridge 23 facing towards the valve member 8 is steep and extends according to the embodiment shown on the draw ⁇ ing in a plane extending perpendicular to the axis of the annular retaining element 22.
• the retaining element is secured in the inserted position thereof , because the ridge 23, as seen in cross section , acts as a pawl or as a barb .
• the securing of the retaining element 22 is according to the embodiment il lustrated fu rther suppor ⁇ ted in that the ridge 23 has a sharp edge .
• valve member 8 in Fig . 4 is provided with a head 9 having a considerably shorter radius than the spheri ⁇ cal part 11 , viz. in such a way that the valve member after the mounting of the annular sealing member 21 , but before the pressing- in of the annular retaining element 22 may be mounted through the branch 3 with the head pointing forward whereafter the valve mem ⁇ ber may be arranged in the final " position by rotating the valve member and simultaneously inserting the head into the side opening 16 from the inside .
• the branches 2 and 3 are according to Fig .
• the head 9 of the valve member 8 in Fig . 4 is provided with a notch 26 for engaging a screw driver for rotating the valve member .
• the same reference numerals have been used as in Fig . 4 as regards al l the instances where similar or equivalent parts are concerned .
• valve member 8 in Fig . 5 consists of two parts , viz . the head 9 and the spherical part 11 which in the mounted condition of the valve are mutual ly connected in a non-rotatable way , seeing that a notch 29 is provided in the spherical part 11 , wherein a rib 30 on the lower surface of the head 9 engages .
• the head 9 is mounted from the interior in the side opening 16 after having been moved throught one of the branches and is arranged with the rib 30 extending parallel with the longitudinal direction of the valve before the mounting of the retaining element 22. Then the spherical part 11 is inserted through the branch 3 with the notch 29 extending paral ⁇ lel with the longitudinal axis of the valve until abutment against the sealing member 21 is obtained , and with the notch 29 engaging the rib 30. Then the annular retaining element 22 is mounted .
• the annular retaining element 22 consists of a single part and is produced from a comparatively hard material , but however, not har ⁇ der than the material allows the deformation necessary for the pres- sing-in of the retaining element.
• a material suitable for the retaining element 22 a mixture of a sulphonated plastic and teflon reinforced by means of fibres may be mentioned . However, it will be understood that many other materials may be used having generally corresponding conditions .
• valves shown on the drawing are mounted in the fol lowing way:
• This seal ing pressure wil l be independent of whether smal l differences exist from valve to valve due to the tolerances used during the manufacturing , e. g . as regards the distance from the recess 24 and to the ridge 23, the axial thickness of the sealing member 21 , the diameter of the spherical part 11 and the length of the part of the retaining element 22 which has been pressed beyond the ridge 23. Moreover, due to the fact that the force necessary in order to press the retaining element 22 past the ridge 23, as ex ⁇ plained previously, generally will be constant from valve to valve, the ratio of the final pressing force applied to the retaining element 22 to the final sealing pressure between the valve member 8 and the sealing member 21 will be well defined .

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Taps Or Cocks (AREA)
• Valve Housings (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8122641

Family Applications (1)

Country Status (4)

Families Citing this family (4)

Citations (3)

Family Cites Families (6)

• 1984
  • 1984-07-11 DK DK341884A patent/DK158016C/da not_active IP Right Cessation
• 1985
  • 1985-07-10 US US06/845,702 patent/US4709902A/en not_active Expired - Fee Related
  • 1985-07-10 WO PCT/DK1985/000067 patent/WO1986000680A1/en not_active Application Discontinuation
  • 1985-07-10 EP EP85903660A patent/EP0188559A1/en not_active Withdrawn

Patent Citations (3)

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