GB2026628A - Seals - Google Patents
Seals Download PDFInfo
- Publication number
- GB2026628A GB2026628A GB7924734A GB7924734A GB2026628A GB 2026628 A GB2026628 A GB 2026628A GB 7924734 A GB7924734 A GB 7924734A GB 7924734 A GB7924734 A GB 7924734A GB 2026628 A GB2026628 A GB 2026628A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cylinder
- gland
- piston
- annular
- packing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
- F16J15/184—Tightening mechanisms
- F16J15/185—Tightening mechanisms with continuous adjustment of the compression of the packing
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Devices (AREA)
Abstract
A gland 20 for compressing the packing rings 16 in the stuffing box 14 of a seal surrounding a shaft 12 passing through the wall 10 of a pressure vessel includes an annular member 50 contacting the outermost packing ring the member being connected to the piston of a piston 42 and cylinder 22 device which is supplied with pressurised hydraulic fluid to ensure that the packing rings are compressed constantly during operation. The piston and cylinder device may be annular such that it can be arranged around the shaft. Inlet and exhaust ports 52, 54 for the fluid are provided in the cylinder. <IMAGE>
Description
SPECIFICATION
Improvements in or Relating to Glands
The present invention concerns improvements in or relating to glands.
Glands are well known for use in conjunction with stuffing boxes to provide a fluid tight seal between a rotatable shaft or reciprocating rod where it passes through the wall of a pressure vessel or the like.
A stuffing box comprises a cylindrical recess around the shaft, the recess containing a packing, normally in the form of annular rings, which is compressed in the stuffing box by the gland to increase its sealing contact with the outer surface of the shaft. The gland is often attached to the pressure vessel by bolts or the like whereby the packing may be compressed by tightening down the bolts.
This arrangement is disadvantageous, especially in sealing arrangements for large shafts as, owing to wear, the packing reduces in size. To maintain the compression in the packing it is necessary to frequently further tighten down the bolts.
It is an object of the present invention to obviate or mitigate these disadvantages.
According to the present invention there is provided a gland for a packed seal, comprising a cylinder and a piston movabie therein, fixing means for holding the cylinder relative to a pressure vessel to be sealed, an annular member connected to the piston and adapted to abut and compress the packing of the seal, and inlet and exhaust means for introducing and exhausting fluid to and from the cylinder.
Preferably the cylinder is annular and surrounds the shaft protruding through the pressure vessel. Correspondingly the piston is annular and connecting members in the form of rods are provided to fix it to the said annular member.
Preferably a closure plate is provided for each end of the cylinder whereby the cylinder may be double acting.
Preferably the piston is provided with O-rings at its outer and inner surfaces.
Preferably an O-ring is provided between said connecting members and the closure plate.
Preferably the cylinder comprises an inner and an outer sleeve, the outer sleeve having an inwardly directed flange forming one end closure plate and the inner sleeve having an outwardly directed flange forming the other end closure plates, the sleeves being an interference fit one between the other.
An embodiment of the present invention will now be described by way of example only with reference to the accompanying drawing which shows part of a pressure vessel wall, a rotatable shaft protruding therethrough and a gland and packing for sealing the clearance between the shaft and the wall.
The pressure vessel wall 10 is penetrated by a circular cross-section rotatable shaft 12 and a stuffing box 14 is provided in the pressure vessel wall around the shaft by forming a recess in the wall. Rings of suitable packing material are fitted into the stuffing box in rubbing contact with the outer surface of the shaft 12.
A gland, generaily designated by the reference numeral 20, is provided to compress the packing rings 1 6 to enhance the seal around the shaft. The gland comprises an annular cylinder 22 having a removable end plate 24 threadably mounted therein. The cylinder 22 comprises an inner sleeve 24 having an outwardly directed flange 26 having a plurality of equipsaced circular cross-section passages 28 therethrough, each passage 28 being recessed to house an O-ring 30. An outer sleeve 32 of the cylinder has an internal diameter substantially equal to the external diameter of the flange 26 and an inwardly directed flange 34 at the end, the internal diameter of the flange 34 being substantially equal to the external diameter of the sleeve 24. A recess 36 is provided in the inner circumference of the flange 34 and houses an O-ring 38.In view of the diameters of the sleeves and their flanges the cylinder may be assembled by interference fitting the inner within the outer and to ensure the correct relative positioning of the sleeves an inwardly directed stop 40 is provided on the outer sleeve 32.
An annular piston 42 is slideably mounted in the cylinder and is provided with O-rings 44 in recesses 46 in the inner and outer circumferences thereof. A plurality of equispaced circular crosssection connecting rods 48 extend from the piston 42 through the passages in the flange 26 and are fixed at their outer ends to an annular member 50 which abuts the packing rings 16.
Inlet and exhaust ports 52, 54 are provided in the cylinder 22 which conveniently has a fixing flange 56 attached to the outer sleeve 32 whereby it may be fixed by studs, only the centre line 58 of which are shown, to the pressure vessel wall 10.
In operation with the piston 42 withdrawn to the end of the cylinder 22 furthest from the wall 10, the packing rings 1 6 are introduced into the stuffing box 14 and the gland 20 is fixed to the wall 10 by the studs. Hydraulic fluid under pressure is supplied to the port 52 of the cylinder so that the piston is caused to travel towards the wall 10 thereby compressing the packing rings in the stuffing box. The seal is then operational and during operation pressurised hydraulic fluid is continually supplied to the port 52 whereby a constant force is exerted on the packing. It will be realised therefore that as the packing reduces in size owing to wear the compressive force thereon is maintained as annular member 50 advances into the stuffing box.When it is desired to introduce fresh packing rings into the stuffing box either to completely replace the packing or to augment the packing already therein, pressurised hydraulic fluid is applied to the port 54 such that the piston retracts into the cylinder allowing access to the stuffing box and thus the introduction of fresh packing rings. Thereafter the compressive force on the packing can be applied -by reintroducing pressurised fluid to the cylinder by way of port 52.
Various modifications can be made without departing from the scope of the invention. For example the piston and cylinder can assume different shapes. Furthermore the construction of the gland is such that it can readily be
manufactured by machining from metal or from
any suitable plastics material.
The embodiment described above provides a
gland which, as it constantly applies pressure to
the packing in the stuffing box, results in less
maintenance time being required and furthermore, in view of the ease of piston
retraction, enables the packing to be augmented
or replaced with the minimum down time.
Claims (9)
1. A gland for a packed seal, comprising a
cylinder and a piston movable therein, fixing
means for holding the cylinder relative to a
pressure vessel to be sealed, an annular member
connected to the piston and adapted to abut and
compress the packing of the seal, and inlet and
exhaust means for introducing and exhausting
fluid to and from the cylinder.
2. A gland as claimed in claim 1, in which the
cylinder is annular and surrounds the shaft
protruding through the pressure vessel.
3. A gland as claimed in claim 2, in which the piston is annular and connecting members in the form of rods are provided to fix it to the said annular member.
4. A gland as claimed in any one of claims 1 to 3, in which a closure plate is provided for each end of the cylinder whereby the cylinder may be double acting.
5. A gland as claimed in claim 3 or claim 4, in which the piston is provided with O-rings at its outer and inner surfaces.
6. A gland as claimed in any one of claims 3 to 5, in which an O-ring is provided between said connecting members and the closure plate.
7. A gland as claimed in any one of claims 2 to 6, in which the cylinder comprises an inner and an outer sleeve, the outer sleeve having an inwardly directed flange forming one end closure plate and the inner sleeve having an outwardly directed flange forming the other end closure plates, the sleeves being an interference fit one between the other.
8. A gland substantially as hereinbefore described with reference to the accompanying drawings.
9. Any novel subject matter or combination including novel subject matter herein disclosed, whether or not within the scope of or relating to the same invention as any of the preceding claims.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB7924734A GB2026628B (en) | 1978-07-26 | 1979-07-16 | Seals |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB7831124 | 1978-07-26 | ||
GB7924734A GB2026628B (en) | 1978-07-26 | 1979-07-16 | Seals |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2026628A true GB2026628A (en) | 1980-02-06 |
GB2026628B GB2026628B (en) | 1982-12-08 |
Family
ID=26268344
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7924734A Expired GB2026628B (en) | 1978-07-26 | 1979-07-16 | Seals |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2026628B (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5076501A (en) * | 1989-04-08 | 1991-12-31 | Sandoz Ltd. | Shotcrete gun |
DE4028048A1 (en) * | 1990-09-05 | 1992-03-12 | Blohm Voss Ag | SEALING DEVICE FOR ROTATING SHAFTS, IN PARTICULAR STEVE TUBE SEALING FOR SHIP PROPELLER SHAFTS |
DE4117097A1 (en) * | 1991-05-25 | 1992-11-26 | Blohm Voss Ag | SEALING DEVICE FOR ROTATING SHAFTS, IN PARTICULAR STEVE TUBE SEALING FOR SHIP PROPELLER SHAFTS |
US5267736A (en) * | 1990-09-05 | 1993-12-07 | Blohm & Voss Ag | Sealing apparatus for rotating shafts, in particular stern tube seal for the propeller shaft of a ship |
AT398235B (en) * | 1987-07-10 | 1994-10-25 | Richter Gedeon Vegyeszet | DEVICE FOR THE SEALING PERFORMANCE OF SHAFTS WITH A LARGE ROTATIONAL ERROR BY CONNECTING PIPES OF CLOSED CONTAINERS |
DE4404919A1 (en) * | 1994-02-16 | 1995-08-17 | Burgmann Dichtungswerk Feodor | Pretensioned insertion of seal packing rings for valve spindle assembly |
WO2003038319A1 (en) * | 2001-10-31 | 2003-05-08 | List Ag | Device for treating a material |
WO2008028235A1 (en) * | 2006-09-05 | 2008-03-13 | Technofast Industries Pty Ltd | Gland packer |
CN107407419A (en) * | 2015-04-10 | 2017-11-28 | 日本皮拉工业株式会社 | Gland seals and the manufacture method of gland sealing |
WO2024097773A1 (en) * | 2022-11-01 | 2024-05-10 | A.W. Chesterton Company | System and method for automatically energizing packing material with a packing loading assembly |
-
1979
- 1979-07-16 GB GB7924734A patent/GB2026628B/en not_active Expired
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT398235B (en) * | 1987-07-10 | 1994-10-25 | Richter Gedeon Vegyeszet | DEVICE FOR THE SEALING PERFORMANCE OF SHAFTS WITH A LARGE ROTATIONAL ERROR BY CONNECTING PIPES OF CLOSED CONTAINERS |
US5076501A (en) * | 1989-04-08 | 1991-12-31 | Sandoz Ltd. | Shotcrete gun |
DE4028048A1 (en) * | 1990-09-05 | 1992-03-12 | Blohm Voss Ag | SEALING DEVICE FOR ROTATING SHAFTS, IN PARTICULAR STEVE TUBE SEALING FOR SHIP PROPELLER SHAFTS |
US5209497A (en) * | 1990-09-05 | 1993-05-11 | Blohm+Voss Ag | Sealing apparatus for rotating shafts, in particular stern tube seal for the propeller shafts of a ship |
US5267736A (en) * | 1990-09-05 | 1993-12-07 | Blohm & Voss Ag | Sealing apparatus for rotating shafts, in particular stern tube seal for the propeller shaft of a ship |
DE4117097A1 (en) * | 1991-05-25 | 1992-11-26 | Blohm Voss Ag | SEALING DEVICE FOR ROTATING SHAFTS, IN PARTICULAR STEVE TUBE SEALING FOR SHIP PROPELLER SHAFTS |
DE4404919A1 (en) * | 1994-02-16 | 1995-08-17 | Burgmann Dichtungswerk Feodor | Pretensioned insertion of seal packing rings for valve spindle assembly |
WO2003038319A1 (en) * | 2001-10-31 | 2003-05-08 | List Ag | Device for treating a material |
WO2008028235A1 (en) * | 2006-09-05 | 2008-03-13 | Technofast Industries Pty Ltd | Gland packer |
CN107407419A (en) * | 2015-04-10 | 2017-11-28 | 日本皮拉工业株式会社 | Gland seals and the manufacture method of gland sealing |
WO2024097773A1 (en) * | 2022-11-01 | 2024-05-10 | A.W. Chesterton Company | System and method for automatically energizing packing material with a packing loading assembly |
Also Published As
Publication number | Publication date |
---|---|
GB2026628B (en) | 1982-12-08 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA1235434A (en) | Symmetrical seal package | |
GB2026628A (en) | Seals | |
FI71824B (en) | MEKANISK TAETNING | |
US3434728A (en) | Means of automatically adjusting hydraulic pneumatic packings | |
US3624802A (en) | Floating stem seal assembly | |
US2673130A (en) | Cylinder head and tube assembly | |
US4194746A (en) | Radially compressed rotary shaft sealing device | |
GB1289732A (en) | ||
NO159317C (en) | ELECTRODE SEALING SYSTEM. | |
US3874707A (en) | Self-adjusting seal load compensator | |
US4557487A (en) | Hybrid seal with both static and dynamic seal rings | |
US4303250A (en) | Sealing in an adapter for available sealing grooves | |
US4807262A (en) | Apparatus for sealing the seam between two conduits | |
US4566372A (en) | Pressure seal for ultra-high pressure apparatus | |
US2791449A (en) | Rotary self-supporting pressure joint | |
GB2278904A (en) | Valve assemblies | |
SU1073522A1 (en) | Assembly for fastening cover to valve body | |
US5727793A (en) | Packing box for fluid displacement device | |
US5507502A (en) | Packing life extender ring | |
DE8814480U1 (en) | Sealing unit for piston pumps | |
FI91015B (en) | Manifold | |
US2825610A (en) | Fluid pressure ram | |
GB981607A (en) | Sealing and guiding arrangement for pistons in cylinders operating with hydraulic or pneumatic pressure media | |
US1473451A (en) | Rod packing | |
RU166582U1 (en) | OIL SEAL |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |