CA2261306A1 - Hermetically sealed disk spring for live loading packing - Google Patents
Hermetically sealed disk spring for live loading packing Download PDFInfo
- Publication number
- CA2261306A1 CA2261306A1 CA 2261306 CA2261306A CA2261306A1 CA 2261306 A1 CA2261306 A1 CA 2261306A1 CA 2261306 CA2261306 CA 2261306 CA 2261306 A CA2261306 A CA 2261306A CA 2261306 A1 CA2261306 A1 CA 2261306A1
- Authority
- CA
- Canada
- Prior art keywords
- housing
- cup
- cap
- spring
- sealed
- 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.)
- Abandoned
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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
-
- 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
- F16J15/186—Tightening mechanisms with continuous adjustment of the compression of the packing using springs
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gasket Seals (AREA)
Abstract
The invention relates to a rigid hermetically sealed housing to protect springs in a live load connection from corrosion, such as in the packing box assemblies of valves and pumps used in chemical processing equipment. Live load connectors include an elongate connector such as a bolt with one end securing a fixed member, and another end securing a movable member, such as the flange of a packing box gland. The bolt connector biases a coaxially disposed spring on its shank against the movable flange. The invention relates to preventing corrosion of the spring with an hermetically sealed telescoping housing enveloping the spring with sealed openings through which the connector shank passes. The telescoping components of the housing can be simply constructed in the form of a hollow cup with a bottom wall with one of the sealed openings, and a cap having a top wall with the other sealed opening thus permitting the bolt shank to pass through the housing while retaining the seal to protect the spring. The cap and cup have slidingly sealed surfaces to provide a telescoping sealed connection thus allowing the spring to flex freely while enveloped in a protective housing. For simplicity of manufacture, the preferred cup has a cylindrical side walls and an annular bottom wall, whereas the cap is annular with a sealed sliding fit on the cylindrical cup walls. The cylindrical shape minimizes the size of the housing and permits use of inexpensive O-ring seals between the bolt shank and the housing, as well as between the telescoping cup and cap portions of the housing. To prevent overstressing of the spring, the housing is rigid and capable of bearing the full load applied to the connector since the cap includes outwardly extending flange for engaging the cup top edge thus preventing overstressing of the spring while transferring the full connector load.
Description
Title : HERMETICALLY SEALED DISK SPRING FOR LIVE LOADING
PACKING
TECHNICAL FIELD
The invention is directed to a rigid hermetically sealed housing to protect springs in a live load connection from corrosion, such as in the packing box assemblies of valves and pumps used in chemical processing equipment.
BACKGROUND OF THE ART
1o Live load connections are used in circumstances such as the packing boxes for packing that seals rotating valve stems or shafts on valves or pumps for example, to prevent fluids from escaping axially along the exterior of valve stem or shafts. In order to seal such packing, a sliding gland is used to apply pressure on the packing usually by tightening the gland to a fixed flange by bolts which are tightened to a 15 desired torque setting.
A difficulty with this type of connection is solved by using spring loaded or live load connections. Vibration or periodic wear of the packing makes it necessary to tighten the bolts periodically. In order to maintain a constant pressure on the packing gland, 2o springs are disposed between the gland and the head of a bolt for example.
The bolts are tightened to a desired torque which is measured to overstress the springs.
Thereafter, the springs apply a substantially constant pressure upon the gland and the timing between periodic inspection and tightening of the bolts and packing can be extended.
Many examples of this type of live loading connection are provided in the prior art.
For example, United States Patent 5,456,447 to Reynolds describes a valve assembly with live load connection applying pressure to valve stem packing. The spring force is applied by Belleville spring washers contained in a hollow cylindrical cup shaped housing with a top washer.
1o A severe problem with such prior art live load connections is that the environment in which valves and fluid pumps are positioned is often very hostile and corrosive. For example, in chemical processing plants, the liquids within valves and pumps may contain acid, brine or other highly corrosive materials which periodically leak or splash on the exterior parts of the valves or pumps. Many components are heavy cast 15 metal parts or are galvanized, painted or otherwise coated with corrosion resistant materials to withstand the corrosive environment satisfactorily.
However, where live load connections are used and springs are exposed to corrosive liquids, premature failure of the spring material occurs. Spring material is generally 2o selected for its predictable resilient properties and commonly available springs are not particularly well suited to corrosive environments. Use of stainless steel or otherwise corrosion resistant springs significantly increases the cost of common place connections. Premature failure of the springs due to corrosion can causes failure of the packing seal and leakage of corrosive or radioactive liquids. For example, in the processing of petrochemicals, leakage can cause significant health or fire hazards, and in the case of nuclear power plants, leakage can result in major environmental catastrophes. Extending the reliable life of packing seals becomes a significant concern in many applications.
On the other hand, due to the large number of valves and pumps or other moving equipment, secured with live load connections, there is a significant concern that the costs of periodic inspection and routine maintenance may be prohibitive.
Modern to petrochemical plants and nuclear power plants for example, typically use as few workers as possible not only to minimize costs but to minimize exposure to dangerous chemicals or radioactive materials by workers.
Commonly such plants handling dangerous materials are controlled through highly 1s sophisticated electronic sensors and switches with the objective of minimizing the need for human intervention as much as possible. In particular, in nuclear power plants, if the need arises to manually inspect or maintain a unit of equipment in a hazardous area, it may be necessary to contain or shut down the entire area for an extended period to permit safe access. Of course, in the event of equipment failure, 2o reliance on the proper sealing provided by live load connections can be extremely critical to the safety of operating personnel and people occupying adjacent areas.
Therefore, it can be seen that what appears to be a simple problem of corrosion can in many circumstances result in premature failure of the seals for critical pumps and valves which control process equipment in highly contaminated, explosive and hazardous chemical or nuclear processing facilities. The costs of the springs is relatively minor compared with the concern for safety, with labour and equipment shut down costs associated with periodic maintenance and inspection.
Surprisingly however, the prior art does not appear to recognize the significance of the spring corrosion risk. Although some springs in prior art live load connections are 1o physically protected within enclosures, these enclosures generally protect the springs from mechanical overstressing rather than chemical corrosion.
In fact, the containment of springs in unsealed enclosures permits accumulation of moisture and condensation in many cases which exacerbates the corrosion problem in 15 the immediate area. Surrounding springs with an enclosure that is not readily visible for inspection may lead to accumulation of moisture or corrosive chemicals which not only corrodes the springs, but adjacent bolts as well, jeopardizing the entire gland and packing assembly.
2o It is an object of the present invention to provide a live load connection which protects the springs from corrosion, particularly in hostile environments.
It is a further object of the invention to provide a live load connection which protects springs from mechanical overstressing.
It is further object of the invention to provide a simple live load connection which can be retrofit to existing equipment with minimal material and labour costs and as little equipment down time as possible.
DISCLOSURE OF THE INVENTION
The invention relates to a rigid hermetically sealed housing to protect springs in a live load connection from corrosion, such as in the packing box assemblies of valves and pumps used in chemical or mining processing equipment.
Live load connectors include an elongate connector such as a bolt with one end securing a fixed member, and another end securing a movable member, such as the flange of a packing box gland. The bolt connector biases a coaxially disposed spring on its shank against the movable flange.
The invention relates to preventing corrosion of the spring with an hermetically sealed telescoping housing enveloping the spring with sealed openings through which the connector shank passes. The telescoping components of the housing can be simply constructed in the form of a hollow cup with a bottom wall with one of the sealed openings, and a cap having a top wall with the other sealed opening thus permitting the bolt shank to pass through the housing while retaining the seal to protect the spring. The cap and cup have sliding sealed surfaces to provide a telescoping sealed connection thus allowing the spring to flex freely while enveloped in a sealed protective housing.
For simplicity of manufacture, the preferred cup has a cylindrical side walls and an annular bottom wall, whereas the cap is annular with a sealed sliding fit on the cylindrical cup walls. The cylindrical shape minimizes the size of the housing and permits use of inexpensive O-ring seals between the bolt shank and the housing, as well as between the telescoping cup and cap portions of the housing.
To prevent overstressing of the spring, the housing is rigid and capable of bearing the full load applied to the connector. The cap includes an outwardly extending flange for engaging the cup top edge thus preventing overstressing of the spring while transferring the full connector load.
Further details of the invention and its advantages will be apparent from the detailed description and drawing included below.
2o BRIEF DESCRIPTION OF THE DRAWING
In order that the invention may be readily understood, one preferred embodiment of the invention will be described by way of example, with reference to the accompanying drawing wherein:
Figure 1 is an axially cross-sectional view through a live load connection according to the invention, which applies packing pressure upon the gland of a packing box surrounding a rotating valve stem, showing an elongate bolt connector and a sealed telescoping housing enveloping the Belleville washer springs sealed with O-rings between the shank of the bolt and between the telescoping portions of the housing.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Figure 1 illustrates an example embodiment of the invention as applied to a common to environment for live load connections namely, the packing box of a rotating valve stem 1.
A fixed flange 2 is attached to the body 7 of the valve and is bolted to a moveable gland 3 with an elongate connector such as a bolt 4. By applying torque to the nut 5 15 or bolt 4, the moveable gland 3 and fixed flange 2 are brought closer together thereby compressing the packing 6 to seal liquid within the valve body 7.
Especially in the case of rotating shafts or valve stems 1 that are rotated frequently, 2o the packing 6 wears away and continuous pressure must be applied to the gland 3 in order to maintain an effective liquid seal, especially in high pressure applications.
Prior art live load connections include a spring or in the illustrated case, Belleville washers 8 disposed co-axially on the shank of the bolt 4 to bias against the moveable flange of gland 3. The springs 8 are compressed to a pre-determined degree in order that the gradual wearing of the packing 6 will be compensated for by the gradual decompression of the spring 8 as the spring 8 flexes and pushes against the gland 3.
Of course, periodic inspection and tightening of the bolt 4 is necessary to maintain constant pressure on the springs 8 thereby ensuring their effectiveness in applying constant pressure to the gland 3.
to As mentioned above, a particular problem in highly corrosive mining or chemical processing, as well as radioactive materials present in nuclear power plants, is the rapid corrosion of springs 8 when exposed to corrosive environments. In addition, even slow corrosion of the springs 8 causes a problem where minimal human contact is desirable, such as in hazardous locations and nuclear power facilities.
Accordingly, the invention provides an improvement over the prior art in the form of a rigid hermetically sealed housing 9 that provides a hollow cup 10 and a cap within which the Belleville washers 8 are protectively housed. The cap 11 and cup 10 are disposed in axially telescoping sealed relation and completely envelop the spring 8 2o as described in detail below.
The hollow cup 10 has a bottom wall 12 with a opening through which the shank of the bolt 4 passes. The bottom opening is sealed with an O-ring 13 to prevent ingress of corrosive liquids or gases into the housing 9. The cap 11 also has a central opening sealed with an O-ring 14 to the shank of the bolt 4.
It will be noted that in the embodiment illustrated, there is very little relative movement between the bolt 4 and cap 11, whereas, resilient movement occurs between the bolt 4 and bottom wall 12 sealed by O-ring 13. The rigid hollow cupl0 has cylindrical upstanding side walls of uniform cylindrical profile and an open top with a peripheral top edge 15.
1o It will be understood that the embodiment is illustrated in the simple form of a cylindrical housing 9 since this matches the Belleville washer shape and is a readily manufactured form that can be accurately machined or cast. Helical springs and Belleville washers 8 are simple annular shapes which lend themselves to a cylindrical housing readily. However, that the invention is not restricted to this illustrated shape 15 and can be applied to any number of configurations with equal advantage.
The cap 11 also includes a top wall through which a sealed opening is provided to seal the cap 11 against the shank of the bolt 4. A third O-ring 16 is provided at the telescoping connection between the cap side surfaces and cup side walls to provide a 2o telescoping sliding connection that permits flexing of the Belleville washers 8 within a preselected range.
Simply stated, if a higher degree of spring movement is required, the length of the side walls of the cap 11 may be extended as required. It will also be apparent that the cap 11 may have cylindrical outer walls which bear upon the external surfaces of the cap 10 rather than the internal surfaces as illustrated.
In order to prevent overstressing of the spring 8, the cap includes an outwardly extending flange 17 to engage the cup top edge 15 if the bolt 4 is excessively torqued.
The rigid cup 10 and cap 11 when engaged in this manner are capable or transmitting the entire bolt load of the bolted connection bypassing the springs 8 and preventing overstressing of the springs as a result.
The invention also provides the significant advantage of hermetically sealing the springs 8 within an enclosed telescopingly sealed housing to prevent corrosion and premature failure of the live loaded connection.
Although the above description and accompanying drawings relate to a specific preferred embodiment as presently contemplated by the inventor, it will be understood that the invention in its broad aspect includes mechanical and functional equivalents of the elements described and illustrated.
PACKING
TECHNICAL FIELD
The invention is directed to a rigid hermetically sealed housing to protect springs in a live load connection from corrosion, such as in the packing box assemblies of valves and pumps used in chemical processing equipment.
BACKGROUND OF THE ART
1o Live load connections are used in circumstances such as the packing boxes for packing that seals rotating valve stems or shafts on valves or pumps for example, to prevent fluids from escaping axially along the exterior of valve stem or shafts. In order to seal such packing, a sliding gland is used to apply pressure on the packing usually by tightening the gland to a fixed flange by bolts which are tightened to a 15 desired torque setting.
A difficulty with this type of connection is solved by using spring loaded or live load connections. Vibration or periodic wear of the packing makes it necessary to tighten the bolts periodically. In order to maintain a constant pressure on the packing gland, 2o springs are disposed between the gland and the head of a bolt for example.
The bolts are tightened to a desired torque which is measured to overstress the springs.
Thereafter, the springs apply a substantially constant pressure upon the gland and the timing between periodic inspection and tightening of the bolts and packing can be extended.
Many examples of this type of live loading connection are provided in the prior art.
For example, United States Patent 5,456,447 to Reynolds describes a valve assembly with live load connection applying pressure to valve stem packing. The spring force is applied by Belleville spring washers contained in a hollow cylindrical cup shaped housing with a top washer.
1o A severe problem with such prior art live load connections is that the environment in which valves and fluid pumps are positioned is often very hostile and corrosive. For example, in chemical processing plants, the liquids within valves and pumps may contain acid, brine or other highly corrosive materials which periodically leak or splash on the exterior parts of the valves or pumps. Many components are heavy cast 15 metal parts or are galvanized, painted or otherwise coated with corrosion resistant materials to withstand the corrosive environment satisfactorily.
However, where live load connections are used and springs are exposed to corrosive liquids, premature failure of the spring material occurs. Spring material is generally 2o selected for its predictable resilient properties and commonly available springs are not particularly well suited to corrosive environments. Use of stainless steel or otherwise corrosion resistant springs significantly increases the cost of common place connections. Premature failure of the springs due to corrosion can causes failure of the packing seal and leakage of corrosive or radioactive liquids. For example, in the processing of petrochemicals, leakage can cause significant health or fire hazards, and in the case of nuclear power plants, leakage can result in major environmental catastrophes. Extending the reliable life of packing seals becomes a significant concern in many applications.
On the other hand, due to the large number of valves and pumps or other moving equipment, secured with live load connections, there is a significant concern that the costs of periodic inspection and routine maintenance may be prohibitive.
Modern to petrochemical plants and nuclear power plants for example, typically use as few workers as possible not only to minimize costs but to minimize exposure to dangerous chemicals or radioactive materials by workers.
Commonly such plants handling dangerous materials are controlled through highly 1s sophisticated electronic sensors and switches with the objective of minimizing the need for human intervention as much as possible. In particular, in nuclear power plants, if the need arises to manually inspect or maintain a unit of equipment in a hazardous area, it may be necessary to contain or shut down the entire area for an extended period to permit safe access. Of course, in the event of equipment failure, 2o reliance on the proper sealing provided by live load connections can be extremely critical to the safety of operating personnel and people occupying adjacent areas.
Therefore, it can be seen that what appears to be a simple problem of corrosion can in many circumstances result in premature failure of the seals for critical pumps and valves which control process equipment in highly contaminated, explosive and hazardous chemical or nuclear processing facilities. The costs of the springs is relatively minor compared with the concern for safety, with labour and equipment shut down costs associated with periodic maintenance and inspection.
Surprisingly however, the prior art does not appear to recognize the significance of the spring corrosion risk. Although some springs in prior art live load connections are 1o physically protected within enclosures, these enclosures generally protect the springs from mechanical overstressing rather than chemical corrosion.
In fact, the containment of springs in unsealed enclosures permits accumulation of moisture and condensation in many cases which exacerbates the corrosion problem in 15 the immediate area. Surrounding springs with an enclosure that is not readily visible for inspection may lead to accumulation of moisture or corrosive chemicals which not only corrodes the springs, but adjacent bolts as well, jeopardizing the entire gland and packing assembly.
2o It is an object of the present invention to provide a live load connection which protects the springs from corrosion, particularly in hostile environments.
It is a further object of the invention to provide a live load connection which protects springs from mechanical overstressing.
It is further object of the invention to provide a simple live load connection which can be retrofit to existing equipment with minimal material and labour costs and as little equipment down time as possible.
DISCLOSURE OF THE INVENTION
The invention relates to a rigid hermetically sealed housing to protect springs in a live load connection from corrosion, such as in the packing box assemblies of valves and pumps used in chemical or mining processing equipment.
Live load connectors include an elongate connector such as a bolt with one end securing a fixed member, and another end securing a movable member, such as the flange of a packing box gland. The bolt connector biases a coaxially disposed spring on its shank against the movable flange.
The invention relates to preventing corrosion of the spring with an hermetically sealed telescoping housing enveloping the spring with sealed openings through which the connector shank passes. The telescoping components of the housing can be simply constructed in the form of a hollow cup with a bottom wall with one of the sealed openings, and a cap having a top wall with the other sealed opening thus permitting the bolt shank to pass through the housing while retaining the seal to protect the spring. The cap and cup have sliding sealed surfaces to provide a telescoping sealed connection thus allowing the spring to flex freely while enveloped in a sealed protective housing.
For simplicity of manufacture, the preferred cup has a cylindrical side walls and an annular bottom wall, whereas the cap is annular with a sealed sliding fit on the cylindrical cup walls. The cylindrical shape minimizes the size of the housing and permits use of inexpensive O-ring seals between the bolt shank and the housing, as well as between the telescoping cup and cap portions of the housing.
To prevent overstressing of the spring, the housing is rigid and capable of bearing the full load applied to the connector. The cap includes an outwardly extending flange for engaging the cup top edge thus preventing overstressing of the spring while transferring the full connector load.
Further details of the invention and its advantages will be apparent from the detailed description and drawing included below.
2o BRIEF DESCRIPTION OF THE DRAWING
In order that the invention may be readily understood, one preferred embodiment of the invention will be described by way of example, with reference to the accompanying drawing wherein:
Figure 1 is an axially cross-sectional view through a live load connection according to the invention, which applies packing pressure upon the gland of a packing box surrounding a rotating valve stem, showing an elongate bolt connector and a sealed telescoping housing enveloping the Belleville washer springs sealed with O-rings between the shank of the bolt and between the telescoping portions of the housing.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Figure 1 illustrates an example embodiment of the invention as applied to a common to environment for live load connections namely, the packing box of a rotating valve stem 1.
A fixed flange 2 is attached to the body 7 of the valve and is bolted to a moveable gland 3 with an elongate connector such as a bolt 4. By applying torque to the nut 5 15 or bolt 4, the moveable gland 3 and fixed flange 2 are brought closer together thereby compressing the packing 6 to seal liquid within the valve body 7.
Especially in the case of rotating shafts or valve stems 1 that are rotated frequently, 2o the packing 6 wears away and continuous pressure must be applied to the gland 3 in order to maintain an effective liquid seal, especially in high pressure applications.
Prior art live load connections include a spring or in the illustrated case, Belleville washers 8 disposed co-axially on the shank of the bolt 4 to bias against the moveable flange of gland 3. The springs 8 are compressed to a pre-determined degree in order that the gradual wearing of the packing 6 will be compensated for by the gradual decompression of the spring 8 as the spring 8 flexes and pushes against the gland 3.
Of course, periodic inspection and tightening of the bolt 4 is necessary to maintain constant pressure on the springs 8 thereby ensuring their effectiveness in applying constant pressure to the gland 3.
to As mentioned above, a particular problem in highly corrosive mining or chemical processing, as well as radioactive materials present in nuclear power plants, is the rapid corrosion of springs 8 when exposed to corrosive environments. In addition, even slow corrosion of the springs 8 causes a problem where minimal human contact is desirable, such as in hazardous locations and nuclear power facilities.
Accordingly, the invention provides an improvement over the prior art in the form of a rigid hermetically sealed housing 9 that provides a hollow cup 10 and a cap within which the Belleville washers 8 are protectively housed. The cap 11 and cup 10 are disposed in axially telescoping sealed relation and completely envelop the spring 8 2o as described in detail below.
The hollow cup 10 has a bottom wall 12 with a opening through which the shank of the bolt 4 passes. The bottom opening is sealed with an O-ring 13 to prevent ingress of corrosive liquids or gases into the housing 9. The cap 11 also has a central opening sealed with an O-ring 14 to the shank of the bolt 4.
It will be noted that in the embodiment illustrated, there is very little relative movement between the bolt 4 and cap 11, whereas, resilient movement occurs between the bolt 4 and bottom wall 12 sealed by O-ring 13. The rigid hollow cupl0 has cylindrical upstanding side walls of uniform cylindrical profile and an open top with a peripheral top edge 15.
1o It will be understood that the embodiment is illustrated in the simple form of a cylindrical housing 9 since this matches the Belleville washer shape and is a readily manufactured form that can be accurately machined or cast. Helical springs and Belleville washers 8 are simple annular shapes which lend themselves to a cylindrical housing readily. However, that the invention is not restricted to this illustrated shape 15 and can be applied to any number of configurations with equal advantage.
The cap 11 also includes a top wall through which a sealed opening is provided to seal the cap 11 against the shank of the bolt 4. A third O-ring 16 is provided at the telescoping connection between the cap side surfaces and cup side walls to provide a 2o telescoping sliding connection that permits flexing of the Belleville washers 8 within a preselected range.
Simply stated, if a higher degree of spring movement is required, the length of the side walls of the cap 11 may be extended as required. It will also be apparent that the cap 11 may have cylindrical outer walls which bear upon the external surfaces of the cap 10 rather than the internal surfaces as illustrated.
In order to prevent overstressing of the spring 8, the cap includes an outwardly extending flange 17 to engage the cup top edge 15 if the bolt 4 is excessively torqued.
The rigid cup 10 and cap 11 when engaged in this manner are capable or transmitting the entire bolt load of the bolted connection bypassing the springs 8 and preventing overstressing of the springs as a result.
The invention also provides the significant advantage of hermetically sealing the springs 8 within an enclosed telescopingly sealed housing to prevent corrosion and premature failure of the live loaded connection.
Although the above description and accompanying drawings relate to a specific preferred embodiment as presently contemplated by the inventor, it will be understood that the invention in its broad aspect includes mechanical and functional equivalents of the elements described and illustrated.
Claims (5)
1. In a live load connection including an elongate connector having: an axis;
a shank; a first end securing a fixed member; and a second end securing a movable member, the connector biasing a coaxially disposed spring on the shank against the movable flange, the improvement comprising:
a rigid hermetically sealed housing having first and second portions, disposed in axially telescoping sealed relation and enveloping the spring, each housing portion having sealed openings through which said connector shank passes.
a shank; a first end securing a fixed member; and a second end securing a movable member, the connector biasing a coaxially disposed spring on the shank against the movable flange, the improvement comprising:
a rigid hermetically sealed housing having first and second portions, disposed in axially telescoping sealed relation and enveloping the spring, each housing portion having sealed openings through which said connector shank passes.
2. A housing according to claim 1 wherein:
the first housing portion comprises a hollow cup with a bottom wall in which one of said sealed opening is disposed, the cup having upstanding side walls of uniform transverse profile and an open top with peripheral top edge; and the second portion comprises a cap having a top wall in which another said sealed opening is disposed, the cap having side surfaces mating said side walls; and including first sealing means disposed about each sealed opening for hermetically sealing the connector shaft to the cup and cap; and second sealing means disposed between the cap side surfaces and cup side walls for sealing the cap and cup together in telescopically sliding relation.
the first housing portion comprises a hollow cup with a bottom wall in which one of said sealed opening is disposed, the cup having upstanding side walls of uniform transverse profile and an open top with peripheral top edge; and the second portion comprises a cap having a top wall in which another said sealed opening is disposed, the cap having side surfaces mating said side walls; and including first sealing means disposed about each sealed opening for hermetically sealing the connector shaft to the cup and cap; and second sealing means disposed between the cap side surfaces and cup side walls for sealing the cap and cup together in telescopically sliding relation.
3. A housing according to claim 2 wherein the cup has an annular bottom wall and cylindrical side walls, and wherein the cap has an annular transverse profile.
4. A housing according to claim 2 wherein the cap includes outwardly extending flange means for engaging the cup top edge thus preventing overstressing of the spring.
5. A housing according to claim 3 wherein the first and second sealing means comprise O-rings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2261306 CA2261306A1 (en) | 1999-02-05 | 1999-02-05 | Hermetically sealed disk spring for live loading packing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2261306 CA2261306A1 (en) | 1999-02-05 | 1999-02-05 | Hermetically sealed disk spring for live loading packing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2261306A1 true CA2261306A1 (en) | 2000-08-05 |
Family
ID=29555098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2261306 Abandoned CA2261306A1 (en) | 1999-02-05 | 1999-02-05 | Hermetically sealed disk spring for live loading packing |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2261306A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103352985A (en) * | 2013-07-19 | 2013-10-16 | 合肥艾普拉斯环保科技有限公司 | Translational sealing device |
| CN105181988A (en) * | 2015-10-09 | 2015-12-23 | 长沙开元仪器股份有限公司 | Sealable sample accommodating box and element analysis tester provided with same |
| US11143314B1 (en) * | 2020-03-25 | 2021-10-12 | Fisher Controls International Llc | Methods and apparatus to load a valve packing |
-
1999
- 1999-02-05 CA CA 2261306 patent/CA2261306A1/en not_active Abandoned
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103352985A (en) * | 2013-07-19 | 2013-10-16 | 合肥艾普拉斯环保科技有限公司 | Translational sealing device |
| CN103352985B (en) * | 2013-07-19 | 2017-06-13 | 合肥艾普拉斯环保科技有限公司 | Translation sealing device |
| CN105181988A (en) * | 2015-10-09 | 2015-12-23 | 长沙开元仪器股份有限公司 | Sealable sample accommodating box and element analysis tester provided with same |
| CN105181988B (en) * | 2015-10-09 | 2017-04-19 | 长沙开元仪器股份有限公司 | Sealable sample accommodating box and element analysis tester provided with same |
| US11143314B1 (en) * | 2020-03-25 | 2021-10-12 | Fisher Controls International Llc | Methods and apparatus to load a valve packing |
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| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |