CA1131607A - Valve seat - Google Patents
Valve seatInfo
- Publication number
- CA1131607A CA1131607A CA340,007A CA340007A CA1131607A CA 1131607 A CA1131607 A CA 1131607A CA 340007 A CA340007 A CA 340007A CA 1131607 A CA1131607 A CA 1131607A
- Authority
- CA
- Canada
- Prior art keywords
- seat ring
- valve
- seat
- seal face
- throttle
- 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.)
- Expired
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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
- F16K1/226—Shaping or arrangements of the sealing
- F16K1/2263—Shaping or arrangements of the sealing the sealing being arranged on the valve seat
Abstract
ABSTRACT OF THE DISCLOSURE:
A valve seat contains a seat ring with flat, parallel side faces. The seat ring consists of steel or possibly of PTFE.
When the valve is being shut by a throttle, a sealing surface of the throttle is pressed against the seat ring which adopt itself as to form and position to the mean line of the throttle, and the seat ring is displaced in a groove in the plane of the seat.
A couple of spring washers sealingly engage the parallel side faces of the seat ring. When the throttle is re-opened the spring washers secure the seat ring in its position.
A valve seat contains a seat ring with flat, parallel side faces. The seat ring consists of steel or possibly of PTFE.
When the valve is being shut by a throttle, a sealing surface of the throttle is pressed against the seat ring which adopt itself as to form and position to the mean line of the throttle, and the seat ring is displaced in a groove in the plane of the seat.
A couple of spring washers sealingly engage the parallel side faces of the seat ring. When the throttle is re-opened the spring washers secure the seat ring in its position.
Description
~ :~1316~`
The present invention rela-tes to a valve seat in a valve housing. More particularly does.the i~vention relate in the first place to a.valve seat intended for.butterfly.valves.
The butterfly.valves in existence-today are usually built on the princlple of soft gaskets. 'A.'very frequent.valve type is illustrated in e.g. the Swedish patent specification 199,078. With this,valve type the whole oE.the.valve housing i5 lined with a soft material, e.g. rubber or other polymer.
A frequent thing is also.to manufacture just the.valve seat ltself from a soft material. Examples of this.valve,.type.are . illustrated in the Swedish patents 1,75,149 of April 25, 1961,:
- '. and 178,131 of February 6, 1962. There are also cases of the '-soft sealing element being instead placed on the sealing face~.
of the throttle. Examples of this principle are.shown in thç
Swedish patent 195,072 of ~arch 16, 1965 and'the German patents 1,011,683 o.f July 4~ 1957 and 1,232,422 of Januar.y 12,,1967.;~
A disadvantage of soft sealing elements in,butterfly~valves.is that their resistance to hlgh-temperature'media is often low.
It is true that the insensitiveness of-synthetic rubber..and-certain other polymers~to hlgh~temperatures has gradually impro,ved, ,but still these klnds of~material cannot:~in any way,compare',, favourably with the resistance to hLgh templeratures of`,steels.':
and other metals and alloys~ The same thing also applies~to the-resistance to certain chemically aggressive media. In these' -:
cases,,too, the properties of high-alloyed stainless~steels and other alloys are quite ..... ~A_... .__._.. _ '''.~. -,''' '-'~
.. ~ ' , t ' 1) ":
, .
' .
: :`
1 1 3~ ~4~
superior to those of soft-materials of rubber type. These circumstances are, of course, well known, and man~ a trial has been made wi-th replacing the soft sealing elements by metallic ones. An example of this type of valve is disclosed in U.S.
patent specification 4,058,290. A drawbac~ oE this valve, however is the wear between the throttle and the seat which has the form of a resilient ring, and also between the seat ring and the housing of the seat ring as the seat ring is displaced relative to the housing each time the throttle is opened or shut.
.
DISCLOSURE_OF INVENTION
A first object of the present invention is to provid-e a valve seat having a good sealing capacity and not employing soft sealing elements made of rubber, plastics or similar materials. More specifically an object is to produce a valve seat having good sealing capacity and which can be entirely manufactured of metal. An object oE the present invention is, however, that the principles of the invention shall not exclude the use of such soft materials as e.g~ PTFE and nylon. There is rather an object that also such materials may be used for the manufacturing of the valve seat, if for some reason or other these are more suitable or otherwise more desirable than metallic materials. In other words, a purpose of the present invention is to create liberty of choice between different materials in regard to their convenience to the medium which the valve is intended to operate with. Further, there is an important object of the invention to provide a valve seat which can be used for throttles of different shapes, e.g. throttles having cylindrical, spherical or conical seal faces, or combina-tions of these or other shapes. An object of this invention is also to provide a butterfly valve being sturdy and reliable, simple to operate and having a long life because of i.a. a minimum of wear between the sealing members.
The present invention rela-tes to a valve seat in a valve housing. More particularly does.the i~vention relate in the first place to a.valve seat intended for.butterfly.valves.
The butterfly.valves in existence-today are usually built on the princlple of soft gaskets. 'A.'very frequent.valve type is illustrated in e.g. the Swedish patent specification 199,078. With this,valve type the whole oE.the.valve housing i5 lined with a soft material, e.g. rubber or other polymer.
A frequent thing is also.to manufacture just the.valve seat ltself from a soft material. Examples of this.valve,.type.are . illustrated in the Swedish patents 1,75,149 of April 25, 1961,:
- '. and 178,131 of February 6, 1962. There are also cases of the '-soft sealing element being instead placed on the sealing face~.
of the throttle. Examples of this principle are.shown in thç
Swedish patent 195,072 of ~arch 16, 1965 and'the German patents 1,011,683 o.f July 4~ 1957 and 1,232,422 of Januar.y 12,,1967.;~
A disadvantage of soft sealing elements in,butterfly~valves.is that their resistance to hlgh-temperature'media is often low.
It is true that the insensitiveness of-synthetic rubber..and-certain other polymers~to hlgh~temperatures has gradually impro,ved, ,but still these klnds of~material cannot:~in any way,compare',, favourably with the resistance to hLgh templeratures of`,steels.':
and other metals and alloys~ The same thing also applies~to the-resistance to certain chemically aggressive media. In these' -:
cases,,too, the properties of high-alloyed stainless~steels and other alloys are quite ..... ~A_... .__._.. _ '''.~. -,''' '-'~
.. ~ ' , t ' 1) ":
, .
' .
: :`
1 1 3~ ~4~
superior to those of soft-materials of rubber type. These circumstances are, of course, well known, and man~ a trial has been made wi-th replacing the soft sealing elements by metallic ones. An example of this type of valve is disclosed in U.S.
patent specification 4,058,290. A drawbac~ oE this valve, however is the wear between the throttle and the seat which has the form of a resilient ring, and also between the seat ring and the housing of the seat ring as the seat ring is displaced relative to the housing each time the throttle is opened or shut.
.
DISCLOSURE_OF INVENTION
A first object of the present invention is to provid-e a valve seat having a good sealing capacity and not employing soft sealing elements made of rubber, plastics or similar materials. More specifically an object is to produce a valve seat having good sealing capacity and which can be entirely manufactured of metal. An object oE the present invention is, however, that the principles of the invention shall not exclude the use of such soft materials as e.g~ PTFE and nylon. There is rather an object that also such materials may be used for the manufacturing of the valve seat, if for some reason or other these are more suitable or otherwise more desirable than metallic materials. In other words, a purpose of the present invention is to create liberty of choice between different materials in regard to their convenience to the medium which the valve is intended to operate with. Further, there is an important object of the invention to provide a valve seat which can be used for throttles of different shapes, e.g. throttles having cylindrical, spherical or conical seal faces, or combina-tions of these or other shapes. An object of this invention is also to provide a butterfly valve being sturdy and reliable, simple to operate and having a long life because of i.a. a minimum of wear between the sealing members.
- 2 -.
~3~.J7 In accordance witil the broad concept of the invention, there is provided and claimed herein an improvement in a throttle valve comprising a valve housing having an annular recess therein, a throttle member,pivotally movable in the valve housing and having an annular seal face, and a valve seat in said annular recess and engageable b~ said throttle member seal face, the i~provement comprising said valve seat including resilient means located in said annular recess and defining an annular groove, and a radially movable seat ring located in said annular groove, said seat ring being made of a stiff material but with sufficient radial direction resiliency such that when subject to a radial load from contact with the throttle member seal face, said seat ring may be displaced in the radial dire~ction, said resilient means and said seat ring cooperating so that when sai~ seat ring maves in a radial direction under said radial load said resilient means sealingly engages said seat ring and when said radial load is removed from said seat ring said resilient means maintains said seat ring substantially in the displaced shape and position,-so that wear between said seat ring and said seal face is minimized, in that when said seat ring is circular and said seal face is circular, the seat ring is displaceable into alignment with said seal face and is maintained in the aligned position when said radial load is removed therefrom, and when said seat ring is circular and said seal face is elliptical, said seat ring is de~ormed into an elliptical shape and is maintained in said elliptical shape when said load is removed therefrom.
Further objects and advantages as well as characteristics of the invention will appear from the following description of the best mode of carrying out the invention.
... ...
~3~
BRIEF DES~RIPTION OF DRAWINGS_ In the following description of the best mode of carrying out the invention reference will be made to the drawings.
Fig. 1 is a section through a valve housing provided with a valve seat according to the preferred embodiment of the invention. The figure also shows a throttle which is in sealing contact with the valve seat.
Fig. 2 shows the valve seat more in detail and how the valve seat can cooperate with the throttle shown in Fig. 1.
BEST MODE OF CARRYING OUT THE INVENTION
Reference is first being made to Fig. 1 that shows a throttle generally shown as 1. The throttle can be turned clockwise from the sealing position according to Fig. 1 to an open position and vice versa by means of a stem 2 carried in a bearing 3 on tho throttle.
\
\
- 3a -. .. _, .
~ 3L3~;V7 A seal face on the throttle 1 is shown as 4. The seal face 4 is annular and its mean line 5 has an elliptic shape with the major axis coinciding with a vertical plane to Fig. 1. As an alternative the mean line 5 has a circular shape. The throttle 1 is eccentrically mounted in bearings in a valve house, a.i. the centre axis oE the stem 2 doesnot intersect the axis oE symmetry through a valve opening in the valve house 6.
The valve house 6 consists of a main portion 7 and a covering plate 8 which is fixed to the main portion by means of screws which are not shown in the drawing. On the side which is turned to the coYering plate 8 the main portion 7 of the valve house is provided with an annular recess 9. In the recess 9 there are provided two spring washers 10 and 11 which constitute carriers and bearing for a valve seat in the form of a seat ring 12. A pair of gaskets has been designated 13 and 14, respectively.
Fig. 2 shows more in detail how the valve seat ring 12 and the carriers and bearings 10 and 11 of the seat ring are designed. The latter members, as above mentioned, consist of a pair of spring washers, usually of -sta~nless steel. The two washers 10 eeh ll are reversedly designed.
In a radial section they comprise a rib portion 15a ~ 15b, respectively, and a leg portion 16a and 17a as well as 16b and 17b respectively, in the outer and the inner end of the rib portion, respectively. The legs of each washer form right angles to the rib portion and are turned in the same direction. Further the inner legs 17a and 17b are shorter than the outer legs 16a and 16b, respectively. The annular groove between the washers 10 and 11 is shown as 18.
- ~ -The valve seat, i.e. the ring 12, is comparatively flat and is provided with two parallel flat side surfaces 19 and~20 and has a rounded seat face 21. According to the embodiment the seat ring 12 consists of steel.
Its extension in the radial direction is about four times~ as large as its thickness.
~ . :
Further the spring washers 10 and 11 are worked such that they in the unloaded condition are slightly conic. More particularly the conicity implies that the legs 17a and 17b tend to approach each other. I~hen ~3~ 7 mounting the assembly the seat ring 12 is arranged between the legs 17a and 17b whereupon the assembly consisting of the spring washers 10 and 11 and the intermediate seat ring 12 are brought together by means of the covering plate 8. ~lerein the legs 17a and 17b~are forced out to a maximum which is cleterminecl on one hand by a space 22 between the main part of the valve house and the spring washer LU, and on the other hand a space bet~een the covering plate 8 and the second spring washer 11. The forces deveLoped by the spring washers 10, 11 are dimensioned such that they are not greater than the seat ring 12 may move in its plane in the groove 18 when subjected to a radial load from the throttle 1 when the throttle is being shut, while the flat, parallel end faces 24a and 24b of the legs 17a and 17b, respectively, sealingly engage the side faces 19 and 20 of the seat rings. However, at the same time the spring forces of the washers 10 and 11 are dimensioned such that they are sufficiently great to maintain the seat ring 12 in its possibly new position and with its possibly changed shape when the ring is released from the radial load when the throttle is opened again. Therefore, through the spring action by the washers 10 and lI there is obtained a tight joining without jamming the seat ring 12 harder than the seat ring being able to adapt its form and position after the shape and position of the ~throttle and thereafter maintaining its form and position when the valve is re-opened. Next time the throttle is shut the seat ring therefore . normally will not be changed neither as ~3~ as its position or its form is concerned. This offers the advantage that the seat ring normally does not move when the valve is being shut or opened which means that wear -can be avoided.
In the starting position the seat ring has a completely circular shape~
which has been indicated by dashed lines in Fig. 2 illustrating the case when the mean line~5 of the throttle has an elliptic~al shape. When the valve is being shut the sealing face 4~on the throttle l~ however, will force the seat ring 12 to be more-and more oval but with constant circumference. Finally when the throttle is completely shut the seat ring will concur with the elliptical shape of the mean ring 5. During these shape changes of the seat ring, the seat ring hence will be dis-placed in the groove 18 with maintained sealing action between the seatring 12 and the flat end faces of the spring washers 17a and 17b, and 24a and 24b respectively. When the throttle is re-opened and the seat ring is ~L~3~
o released ~rom the radial loacl from the throttle, the elliptical shape o~ Lhe seat ring will be mclirltailled by means of the spring washers 10, Il whictl press ag.li[lst the ;;de [aces L9, 20 with forces which are sufficienL to prevent ring L2 Erom re-aclopting its circular~ resting position. In the case whell ~he mean Line 5 in~stead is circuIar, the shape of the seat r;ng will not change during the "prime~ry" shutting action, but its position in the groove 18 can be changed, which position thereafter normally is maintained by means of the spring washers during subsequent shuttillg and opening actions.
The spring washers 10, 11 also have another function. They may namely absorb thermal expansions, variations of pressures and the like with-out impairing the sealing action. To the contrary the sealing action may be improved when a pressure of the fluid in the conduit is exerted upon each or both of the spring washers in the space 22 and/or 23, which pressure is transferred via the inner portions 17a and/or 17b of the spring washers.
. .
~3~.J7 In accordance witil the broad concept of the invention, there is provided and claimed herein an improvement in a throttle valve comprising a valve housing having an annular recess therein, a throttle member,pivotally movable in the valve housing and having an annular seal face, and a valve seat in said annular recess and engageable b~ said throttle member seal face, the i~provement comprising said valve seat including resilient means located in said annular recess and defining an annular groove, and a radially movable seat ring located in said annular groove, said seat ring being made of a stiff material but with sufficient radial direction resiliency such that when subject to a radial load from contact with the throttle member seal face, said seat ring may be displaced in the radial dire~ction, said resilient means and said seat ring cooperating so that when sai~ seat ring maves in a radial direction under said radial load said resilient means sealingly engages said seat ring and when said radial load is removed from said seat ring said resilient means maintains said seat ring substantially in the displaced shape and position,-so that wear between said seat ring and said seal face is minimized, in that when said seat ring is circular and said seal face is circular, the seat ring is displaceable into alignment with said seal face and is maintained in the aligned position when said radial load is removed therefrom, and when said seat ring is circular and said seal face is elliptical, said seat ring is de~ormed into an elliptical shape and is maintained in said elliptical shape when said load is removed therefrom.
Further objects and advantages as well as characteristics of the invention will appear from the following description of the best mode of carrying out the invention.
... ...
~3~
BRIEF DES~RIPTION OF DRAWINGS_ In the following description of the best mode of carrying out the invention reference will be made to the drawings.
Fig. 1 is a section through a valve housing provided with a valve seat according to the preferred embodiment of the invention. The figure also shows a throttle which is in sealing contact with the valve seat.
Fig. 2 shows the valve seat more in detail and how the valve seat can cooperate with the throttle shown in Fig. 1.
BEST MODE OF CARRYING OUT THE INVENTION
Reference is first being made to Fig. 1 that shows a throttle generally shown as 1. The throttle can be turned clockwise from the sealing position according to Fig. 1 to an open position and vice versa by means of a stem 2 carried in a bearing 3 on tho throttle.
\
\
- 3a -. .. _, .
~ 3L3~;V7 A seal face on the throttle 1 is shown as 4. The seal face 4 is annular and its mean line 5 has an elliptic shape with the major axis coinciding with a vertical plane to Fig. 1. As an alternative the mean line 5 has a circular shape. The throttle 1 is eccentrically mounted in bearings in a valve house, a.i. the centre axis oE the stem 2 doesnot intersect the axis oE symmetry through a valve opening in the valve house 6.
The valve house 6 consists of a main portion 7 and a covering plate 8 which is fixed to the main portion by means of screws which are not shown in the drawing. On the side which is turned to the coYering plate 8 the main portion 7 of the valve house is provided with an annular recess 9. In the recess 9 there are provided two spring washers 10 and 11 which constitute carriers and bearing for a valve seat in the form of a seat ring 12. A pair of gaskets has been designated 13 and 14, respectively.
Fig. 2 shows more in detail how the valve seat ring 12 and the carriers and bearings 10 and 11 of the seat ring are designed. The latter members, as above mentioned, consist of a pair of spring washers, usually of -sta~nless steel. The two washers 10 eeh ll are reversedly designed.
In a radial section they comprise a rib portion 15a ~ 15b, respectively, and a leg portion 16a and 17a as well as 16b and 17b respectively, in the outer and the inner end of the rib portion, respectively. The legs of each washer form right angles to the rib portion and are turned in the same direction. Further the inner legs 17a and 17b are shorter than the outer legs 16a and 16b, respectively. The annular groove between the washers 10 and 11 is shown as 18.
- ~ -The valve seat, i.e. the ring 12, is comparatively flat and is provided with two parallel flat side surfaces 19 and~20 and has a rounded seat face 21. According to the embodiment the seat ring 12 consists of steel.
Its extension in the radial direction is about four times~ as large as its thickness.
~ . :
Further the spring washers 10 and 11 are worked such that they in the unloaded condition are slightly conic. More particularly the conicity implies that the legs 17a and 17b tend to approach each other. I~hen ~3~ 7 mounting the assembly the seat ring 12 is arranged between the legs 17a and 17b whereupon the assembly consisting of the spring washers 10 and 11 and the intermediate seat ring 12 are brought together by means of the covering plate 8. ~lerein the legs 17a and 17b~are forced out to a maximum which is cleterminecl on one hand by a space 22 between the main part of the valve house and the spring washer LU, and on the other hand a space bet~een the covering plate 8 and the second spring washer 11. The forces deveLoped by the spring washers 10, 11 are dimensioned such that they are not greater than the seat ring 12 may move in its plane in the groove 18 when subjected to a radial load from the throttle 1 when the throttle is being shut, while the flat, parallel end faces 24a and 24b of the legs 17a and 17b, respectively, sealingly engage the side faces 19 and 20 of the seat rings. However, at the same time the spring forces of the washers 10 and 11 are dimensioned such that they are sufficiently great to maintain the seat ring 12 in its possibly new position and with its possibly changed shape when the ring is released from the radial load when the throttle is opened again. Therefore, through the spring action by the washers 10 and lI there is obtained a tight joining without jamming the seat ring 12 harder than the seat ring being able to adapt its form and position after the shape and position of the ~throttle and thereafter maintaining its form and position when the valve is re-opened. Next time the throttle is shut the seat ring therefore . normally will not be changed neither as ~3~ as its position or its form is concerned. This offers the advantage that the seat ring normally does not move when the valve is being shut or opened which means that wear -can be avoided.
In the starting position the seat ring has a completely circular shape~
which has been indicated by dashed lines in Fig. 2 illustrating the case when the mean line~5 of the throttle has an elliptic~al shape. When the valve is being shut the sealing face 4~on the throttle l~ however, will force the seat ring 12 to be more-and more oval but with constant circumference. Finally when the throttle is completely shut the seat ring will concur with the elliptical shape of the mean ring 5. During these shape changes of the seat ring, the seat ring hence will be dis-placed in the groove 18 with maintained sealing action between the seatring 12 and the flat end faces of the spring washers 17a and 17b, and 24a and 24b respectively. When the throttle is re-opened and the seat ring is ~L~3~
o released ~rom the radial loacl from the throttle, the elliptical shape o~ Lhe seat ring will be mclirltailled by means of the spring washers 10, Il whictl press ag.li[lst the ;;de [aces L9, 20 with forces which are sufficienL to prevent ring L2 Erom re-aclopting its circular~ resting position. In the case whell ~he mean Line 5 in~stead is circuIar, the shape of the seat r;ng will not change during the "prime~ry" shutting action, but its position in the groove 18 can be changed, which position thereafter normally is maintained by means of the spring washers during subsequent shuttillg and opening actions.
The spring washers 10, 11 also have another function. They may namely absorb thermal expansions, variations of pressures and the like with-out impairing the sealing action. To the contrary the sealing action may be improved when a pressure of the fluid in the conduit is exerted upon each or both of the spring washers in the space 22 and/or 23, which pressure is transferred via the inner portions 17a and/or 17b of the spring washers.
. .
Claims (9)
1. In a throttle valve comprising a valve housing having an annular recess therein, a throttle member pivotally movable in the valve housing and having an annular seal face, and a valve seat in said annular recess and engageable by said throttle member seal face, the improvement comprising said valve seat including resilient means located in said annular recess and defining an annular groove, and a radially movable seat ring located in said annular groove, said seat ring being made of a stiff material but with sufficient radial direction resiliency such that when subject to a radial load from contact with the throttle member seal face, said seat ring may be displaced in the radial direction, said resilient means and said seat ring cooperating so that when said seat ring moves in a radial direction under said radial load said resilient means sealingly engages said seat ring and when said radial load is removed from said seat ring said resilient means maintains said seat ring substantially in the displaced shape and position, so that wear between said seat ring and said seal face is minimized, in that when said seat ring is circular and said seal face is circular, the seat ring is displaceable into align-ment with said seal face and is maintained in the aligned position when said radial load is removed therefrom, and when said seat ring is circular and said seal face is elliptical, said seat ring is deformed into an elliptical shape and is maintained in said elliptical shape when said load is removed therefrom.
2. Valve of claim 1, wherein said resilient means comprises a pair of spring washers located on each side of said seat ring and sealingly pressing against said seat ring.
3. Valve of claim 2, wherein said spring washers define the shape of the annular groove in which said seat ring is displaceably carried.
4. Valve of claims 1, 2 or 3, wherein said seat ring is comparatively flat with an extension in the radial direction which is at least twice that of the axial direction.
5. Valve of claims 2 or 3, wherein the spring washers are pressed out by the seat ring during mounting of said seat ring, said seat ring has parallel side faces, and an inner portion of said spring washers resiliently sealingly presses against said parallel side faces of said seat ring.
6. Valve of claims 2 or 3, wherein the spring washers are pressed out by the seat ring during mounting of said seat ring, said seat ring has parallel side faces, and an-inner portion of said spring washers resiliently sealingly presses against said parallel side faces of said seat ring and wherein said seat ring is made of steel or other metal or alloy.
7. Valve of claims 2 or 3, wherein the spring washers are pressed out by the seat ring during mounting of said seat ring, said seat ring has parallel side faces, and an inner portion of said spring washers resiliently sealingly presses against said parallel side faces of said seat ring and wherein said seat ring is at least partly made of stiff plastic material.
8. Valve of claims 1, 2 or 3, wherein said seat ring is also deformed in the radial direction when subject to a radial load from contact with the throttle member seat face, and wherein said resilient means and said seat ring cooperate so that when said radial load is removed from said seat ring the resilient means maintain said seat ring substantially in the deformed shape and position.
9. A throttle valve comprising a valve housing having an annular recess therein, a throttle member pivotably movable in the valve housing, said throttle member having an annular seal face, a pair of spring means in said annular recess, said spring means defining an annular groove therein-between a seat ring located in said annular groove between said spring means and made of a stiff material but with sufficient radial direction resiliency such that the shape of the seat ring when subjected to a radial load from contact with said throttle member seal face may be radially displaced in said groove between said spring means, said spring means and said seat ring cooperating so that said spring means sealingly engage said seat ring when said seat ring moves in said groove between said spring means, and when said radial load is removed from said seat ring said spring means maintains said seat ring substantially in the displaced position thereby minimizing wear between said seat ring and said throttle member seal face, in that when said seat ring is circular and said seal face is circular, the seat ring is displaceable into alignment with said seal face and is maintained in the aligned position when said radial load is removed therefrom, and when said seat ring is circular and said seal face is elliptical, said seat ring is deformed into an elliptical shape and is maintained in said elliptical shape when said radial load is removed therefrom.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7811865-0 | 1978-11-17 | ||
| SE7811865 | 1978-11-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1131607A true CA1131607A (en) | 1982-09-14 |
Family
ID=20336387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA340,007A Expired CA1131607A (en) | 1978-11-17 | 1979-11-16 | Valve seat |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS5569362A (en) |
| CA (1) | CA1131607A (en) |
| DE (1) | DE2945817A1 (en) |
| FI (1) | FI70461C (en) |
| NO (1) | NO152308C (en) |
| SE (1) | SE437711B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3001637A1 (en) * | 1980-01-17 | 1981-07-23 | Micafil AG, 8048 Zürich | Curable mixt. of epoxide resin, poly:ol, isocyanate and catalyst - combines easy processing with high thermal stability after cure |
| SE445382B (en) * | 1984-09-27 | 1986-06-16 | Somas Ventiler | GAS VALVE SEALING DEVICE |
| DE8817267U1 (en) * | 1988-07-13 | 1996-04-11 | Mannesmann Ag | Shut-off device for pipes |
| DE29622643U1 (en) * | 1996-11-09 | 1998-03-12 | Richter Albert Ari Armaturen | Valve |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI54536C (en) * | 1975-04-15 | 1978-12-11 | Neles Oy | KLAFFVENTIL |
| GB1561593A (en) * | 1975-10-02 | 1980-02-27 | Fisher Controls Co | Valve structure |
-
1979
- 1979-06-11 NO NO791933A patent/NO152308C/en unknown
- 1979-10-24 FI FI793305A patent/FI70461C/en not_active IP Right Cessation
- 1979-11-13 DE DE19792945817 patent/DE2945817A1/en active Granted
- 1979-11-15 JP JP14831779A patent/JPS5569362A/en active Granted
- 1979-11-16 CA CA340,007A patent/CA1131607A/en not_active Expired
- 1979-11-16 SE SE7909460A patent/SE437711B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE2945817C2 (en) | 1988-07-21 |
| FI70461B (en) | 1986-03-27 |
| FI70461C (en) | 1986-09-19 |
| JPS6249511B2 (en) | 1987-10-20 |
| NO152308C (en) | 1985-09-04 |
| SE437711B (en) | 1985-03-11 |
| JPS5569362A (en) | 1980-05-24 |
| SE7909460L (en) | 1980-05-18 |
| DE2945817A1 (en) | 1980-05-29 |
| NO152308B (en) | 1985-05-28 |
| NO791933L (en) | 1980-05-20 |
| FI793305A (en) | 1980-05-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4519579A (en) | Cam valve self-centering seat | |
| US3041036A (en) | Plug valve | |
| CA1106344A (en) | Ball valve with readily removable ball and seats for high temperature environment | |
| CA1125725A (en) | Butterfly valve | |
| CA1054126A (en) | Groove mounted resilient valve seat having a deformable lip | |
| US4944489A (en) | Rotary valve and seal | |
| US3561727A (en) | High stress valve seal and valves | |
| JPS5944541B2 (en) | spherical valve | |
| CA1176225A (en) | Fluid-pressure-loaded seal for butterfly valves | |
| US4165859A (en) | Seal assembly | |
| JPH0444148B2 (en) | ||
| CA1291104C (en) | High strength ball valve seat assembly | |
| CA1212094A (en) | Valve seal for fire safe or high temperature valves | |
| US4911407A (en) | Valve seat structure and assembly | |
| US4286769A (en) | Valve seat | |
| US4195815A (en) | Bidirectional valve for cryogenic fluids | |
| US3567178A (en) | Valve stem packing and bearing assembly | |
| US4792118A (en) | Low dead space ring | |
| CA1131607A (en) | Valve seat | |
| US4580763A (en) | Seal-seat for use in ball valves | |
| WO1997021051A1 (en) | Rotary valve with pressure energized seal | |
| US3948480A (en) | Rotary ball valve | |
| WO2000020783A1 (en) | Valve with ball of controlled deformation | |
| JPS6318058B2 (en) | ||
| US5918857A (en) | Packing for the axis of a clack valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |