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
  • F16K41/00—Spindle sealings
  • F16K41/02—Spindle sealings with stuffing-box ; Sealing rings

Definitions

• the invention relates to a shut-off valve with a sealing device according to the preamble of claim 1.
• a shut-off valve with a sealing packing known from US Pat. No. 2,780,233 also has the disadvantage that it has a comparatively large overall height.
• the use of only one seal packing serving as the main sealing element in the various operating positions cannot meet the legal regulations applicable in Germany even with this known solution.
• the fulfillment of the relevant tightness requirement is not guaranteed even when the sealing packs have to be replaced, since a rear sealing element is completely absent.
• the structural design of the solution known from US Pat. No. 2,780,233 is comparatively complicated, so that a plurality of housing parts must be removed and installed when changing the seal pack.
• the invention is based on the object of Matur or to create a sealing device for a shut-off valve, which avoids the disadvantages of the known solutions and is characterized by meeting very high demands on the tightness.
• a shut-off valve should in particular meet the critical provisions of the German legal regulation known under the short name "TA Vietnamese” and from 27.02. Dated 1986.
• shut-off valve In the shut-off valve according to the invention, a configuration of the sealing area is provided which, due to a larger inside diameter, is not exposed to wear when the spindle or shaft is turned.
• the sealing elements are only subjected to pressure shortly before the valve closes.
• the majority of the large fittings are in operation for a long time either in the open or closed state, since these are not control valves that change their operating states often.
• the periods between the operations of the large fittings are consequently very long, for example up to two years.
• the invention does justice to such static operation, which is far more than 99%, in that an additional static seal is provided in the sealing area both when the valve is closed and when it is in an intermediate position. This additional seal is not dynamically stressed during valve actuation and is therefore subject to practically no wear.
• FIG. 3 the slide valve according to FIG. 1 in the open position
• a shut-off valve which is designed as a slide valve 12.
• the slide valve has a valve housing 14 in which a slide wedge (not shown here) is accommodated, which can be actuated via a spindle 13.
• the spindle 13 is guided in a cylindrical packing housing 19 of a sealing device 18 which is firmly connected to the valve housing 14.
• the cylindrical packing housing 19 is provided at its end in the armature housing 14 with a sealing seat 20 for receiving a spindle back seal 15, which takes effect when the slide is open (FIG. 3) and to which a threaded part 32 is fastened which is threaded ⁇ bore 31 can be screwed.
• the cylindrical Packungs ⁇ housing 19 contains a guide bore 34 for the spindle 13, a bore 21 and a threaded bore 22 with an internal thread 26.
• the bore 21 is used to guide - in the example two - grooved metal rings 7, which are sealed by O-rings 23 support against the bore 21 or the spindle 13.
• the stuffing box 5 has a first extension part 25 which is provided with an external thread 10 which can be screwed into the cylindrical packing housing 10 via the internal thread 26 and serves to apply the required packing pressure to the graphite packing rings 6.
• a second extension part 27 of the stuffing box 5 has an extension bore 28 in which an axial bearing 3 is accommodated.
• the extension part 25 has a bevel 29, in which an O-ring 4 is accommodated, which is supported against the axial bearing 3.
• the axial bearing 3 is fixed by a retaining ring 9 which is held by fastening elements 16, in the example by screws, which engage in threaded bores 30 of the second extension part 27.
• a threaded hole 8 is provided in the cylindrical packing housing 19 in the area of the grooved metal rings 7 for receiving a packing squeezing device (not shown here).
• a spring 2 is attached to the spindle 13 and is held by a height-adjustable locking ring 1. The latter can be fixed via a fastening element 17.
• the operation of the sealing device 18 is as follows:
• the locking ring 1 is fixed in accordance with FIG. 1 so that when the slide is closed, it exerts a precisely defined pressure on the O-ring 4, which has not been loaded until then, via the spring 2 and the axial bearing 3.
• the Achsial ⁇ bearing 3 compensates for the radial forces and thus serves as wear protection.
• the design of the dynamically loaded sealing elements has been optimized.
• the grooved metal rings 7 with inserted O-rings 23, when changing the packing rings 6, in addition to the already known Known spindle back seal 15 is an additional sealing element.
• the metal rings 7 serve as an extrusion aid for the graphite packing rings 6.
• the contact pressure required for the graphite packing rings 6 is applied via the stuffing box 5 by screwing the external thread 10 into the internal thread 26 .
• the threaded hole 8 is provided for the connection of a packing extrusion device, not shown.
• a packing extrusion device not shown.
• spindle and sealing surface damage which otherwise occurs when the packing rings 6 are removed by means of a packing puller (needle) is avoided.
• the retaining ring 9 serves to fix the only statically loaded O-ring 4 when the spindle is actuated.
• the spindle 13 With the aid of the threaded part 32 arranged above the spindle back seal 15, which is screwed into the threaded bore 31, the spindle 13 can be locked when the slide is open, so that the graphite packing rings 6 are removed and installed in one piece can.
• the rear seal can be very similar. lent the seal shown in the upper area of the drawing figures, as can be seen from FIG.
• the Padosungsge housing 19 has at its lower end instead of the otherwise provided oblique sealing seat 20 with threaded bore 31 a circular cylindrical bore in which an annular body 3 'is located, which is analogous to the compression spring 2 in the open position of the spindle 13 lower compression spring 2 'is applied.
• This additional annular body 3 'provided for the rear seal presses an annular seal 4', which is preferably designed as an O-ring, into an inclined groove rising towards the center.
• the ring body 3 ' is secured by a retaining ring 9'.
• the described construction of the back seal corresponds in its basic structure to the sealing device which is effective at the upper end of the stuffing box 5. In the position according to FIG. 4, the rear seal is not effective, since this is an intermediate position. Rather, this back seal only becomes effective when the gate valve has moved into its open position.
• the stuffing box is fed in by rotating it in a threaded bore.
• the sealing elements of the packing can also be acted upon by a stuffing box which can only be displaced in the axial direction and cannot be rotated and which is pressed against the packing by a compression spring which is effective in the axial direction. .

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Details Of Valves (AREA)
• Sealing Devices (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6398251

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (3)

Citations (5)

Family Cites Families (4)

• 1990
  • 1990-01-18 DE DE4001233A patent/DE4001233A1/de active Granted
• 1991
  • 1991-01-17 WO PCT/EP1991/000074 patent/WO1991010855A1/de not_active Ceased
  • 1991-01-17 DE DE91903713T patent/DE59100719D1/de not_active Expired - Fee Related
  • 1991-01-17 JP JP3503683A patent/JPH04504464A/ja active Pending
  • 1991-01-17 EP EP91903713A patent/EP0463155B1/de not_active Expired - Lifetime

Patent Citations (5)

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