CA1163896A - Overrange valve or the like - Google Patents
Overrange valve or the likeInfo
- Publication number
- CA1163896A CA1163896A CA000422662A CA422662A CA1163896A CA 1163896 A CA1163896 A CA 1163896A CA 000422662 A CA000422662 A CA 000422662A CA 422662 A CA422662 A CA 422662A CA 1163896 A CA1163896 A CA 1163896A
- Authority
- CA
- Canada
- Prior art keywords
- bellows
- spring
- fixed
- springs
- mounting ring
- 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
Landscapes
- Diaphragms And Bellows (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A differential pressure unit having overrange valves loosely mounted on a valve stem connected between the ends of a respective pair of movable bellows ends. A pair of spiral range springs bias both valves toward open positions. The valves include annular elastomers bonded to the edges of the apertured discs. The apertures in the discs act to allow the elastomers to seat and to unseat without causing lock-up. The discs are retained between plates and snap rings.
A differential pressure unit having overrange valves loosely mounted on a valve stem connected between the ends of a respective pair of movable bellows ends. A pair of spiral range springs bias both valves toward open positions. The valves include annular elastomers bonded to the edges of the apertured discs. The apertures in the discs act to allow the elastomers to seat and to unseat without causing lock-up. The discs are retained between plates and snap rings.
Description
1 16389&
This invention relates to valves, and more particularly to over-range valves or the like to protect structures from excessive pressures.
Overrange valves are employed in conventional differential pressure units. Examples of the same are disclosed in the following:
Jones United States Patent No. 2,664,749 issued January 5, 1954.
Greenwood et al United States Patent No. 3,820,755 issued June 28, 1974.
Neither of the said Jones and Greenwood et al. disclosures have the best construction to prevent overrange valves from sticking or, locking closed. However, Greenwood et al. discloses a tiltable poppet valve.
In accordance with the valve of the present invention, the above-described and other disadvantages of the prior art are overcome by providing a fluid pressure responsive apparatus, said apparatus comprising: a mounting ring assembly; first and second bellows each having an open end and a closed end, said open ends being sealed around respective opposite sides of said mounting ring assembly; first and second disc-like planar springs, said first spring being fixed at its periphery to one side of said mounting ring assembly, said second spring being fixed at its periphery to the other side of said mounting ring assembly, each of said springs having a pair of spiral slots of polar symmetry; a first stem having one end fixed to the center of said first spring and another end fixed to the center of said first bellows closed end;
a second stem having one end fixed to said second spring and another end fixed to the center of said second bellows closed end, the centers of said first and second springs being fixed relative to each other, said first and second springs biasing both of said first and second bellows against a differential pressure thereacross and guiding the same and said first and second stems and limiting movement of said first and second stems and said bellows approximate-q~
1 163~9B
ly to an axial direction; and a housing around each of said bellows to admit fluids of the same or different pressures to the respective exteriors of each of said bellows.
A feature of the invention resides in the use of a vented seal to prevent lock-up.
In the accompanying drawings which illustrate exemplary embodiments of the present invention:
Figure 1 is a longitudinal sectional view of a differential pressure unit (DPU) constructed in accordance with the present invention;
Figure 2 is an enlarged longitudinal sectional view of a portion of the DPU shown in Figure l;
Figure 3 is a front elevational view of parts shown in Figures 1 and
This invention relates to valves, and more particularly to over-range valves or the like to protect structures from excessive pressures.
Overrange valves are employed in conventional differential pressure units. Examples of the same are disclosed in the following:
Jones United States Patent No. 2,664,749 issued January 5, 1954.
Greenwood et al United States Patent No. 3,820,755 issued June 28, 1974.
Neither of the said Jones and Greenwood et al. disclosures have the best construction to prevent overrange valves from sticking or, locking closed. However, Greenwood et al. discloses a tiltable poppet valve.
In accordance with the valve of the present invention, the above-described and other disadvantages of the prior art are overcome by providing a fluid pressure responsive apparatus, said apparatus comprising: a mounting ring assembly; first and second bellows each having an open end and a closed end, said open ends being sealed around respective opposite sides of said mounting ring assembly; first and second disc-like planar springs, said first spring being fixed at its periphery to one side of said mounting ring assembly, said second spring being fixed at its periphery to the other side of said mounting ring assembly, each of said springs having a pair of spiral slots of polar symmetry; a first stem having one end fixed to the center of said first spring and another end fixed to the center of said first bellows closed end;
a second stem having one end fixed to said second spring and another end fixed to the center of said second bellows closed end, the centers of said first and second springs being fixed relative to each other, said first and second springs biasing both of said first and second bellows against a differential pressure thereacross and guiding the same and said first and second stems and limiting movement of said first and second stems and said bellows approximate-q~
1 163~9B
ly to an axial direction; and a housing around each of said bellows to admit fluids of the same or different pressures to the respective exteriors of each of said bellows.
A feature of the invention resides in the use of a vented seal to prevent lock-up.
In the accompanying drawings which illustrate exemplary embodiments of the present invention:
Figure 1 is a longitudinal sectional view of a differential pressure unit (DPU) constructed in accordance with the present invention;
Figure 2 is an enlarged longitudinal sectional view of a portion of the DPU shown in Figure l;
Figure 3 is a front elevational view of parts shown in Figures 1 and
2;
Figure 4 is a vertical sectional view of the parts taken on the line 4-4 shown in Figure 3; and Figure 5 is a broken away, exploded perspective view illustrating the manner in which spiral springs are mounted in Figure 1.
The DPU shown in Figure 1 may be conventional except for arrangements 10 and 11 providing overrange valves, and spiral springs 12 and 13 which may be identical to each other and to spiral spring 14 shown in Figure 5.
The DPU assembly is held together by cap screws 15 and 16, the outer portions of the DPU including hat-shaped sections 17 and 18. Hat-shaped sections 17 and 18 have two openings thereinto, only one of which is shown at 19 in Figure 1. See also the said Jones patent.
Sections 17 and 18 provide chambers 19 and 20 in which bellows 21 and 22 are mounted.
A stem 23 extends through most of the interior of the DPU, and all 1 163~g~
parts thereto are substantially fixed relative to each other. part 24 is fixed relative to the right end of bellows 22, and is threaded to part 25. A central part 26 is threaded inside parts 27 and 25. Part 27 is threaded inside part 28.
The DPU has a central portion 29 sealed to portions 30 and 31 to which sections 17 and 18 are sealed respectively.
Seals are indica~ed at 32, 32', 33, and 33'. An arm 34 rotates a torque tube 35 responsive to reciprocation of stem 23, the operation of which and construction of which may be identical to those shown in the said Jones patent.
Due to the fact that arrangement 10 is essentially the same as an arrangement 11, although arrangements 10 and 11 are reversed, only arrangement 11 will be described in greater detail. An enlarged view of arrangement 11 is shown in Pigure 2. An elastomer s~ch as rubber at 37 is bonded to a disc 38.
Elastomer 37 is pressed against a fixed surface of an annular valve seat 36 (Pigures 1 and 2) by a plate 39 welded or sealed at 40 to hub part 25.
Note will be taken that surface 36 lies in a plane substantially transverse to the longitudinal axis of the DPU in Eigure 1 and is annular.
As shown in Figure 2, a snap ring 41 is substantially fixed in a groove 42 in part 25. When elastomer 37 is spaced from surface 36 as in Figure 1, note will be taken that disc 38 can move in a radial or in an axial direction or can tilt. This makes it possible for a good seal to be provided by elasto-mer 37 between surface 36 and the right hand surface of plate 39.
In Figure 2, note that space is provided at A so that the fit of disc 38 is somewhat loose.
Disc 38 and elastomer 37 are shown again in Figures 3 and 4 to a scale substantially the same as that to which the~ have been shown in Figure 1.
1 16389~
In Figure 3, note that disc 38 has 3 holes 43 extending completely therethrough. As shown in Figure 2, holes 43 permit the escape and ingress of an incompressible liquid respectively from and to the space between dics 38 and plate 39. Note will be taken that without holes 43, if the said spaces are sealed, stem 23 may stick with the valve of one of the arrangements 10 or ll closed.
Spring 14 shown in Figure 5 may be entirely conventional, if desired.
Screw holes are indicated at 44. Spring 13 would fit in DPU portion 31 in the same manner that spring 14 would and as shown in Figure 5. Spring 12 would be similarly mounted in DPU portion 30.
Cap screws 52 and 53 in Figures 1 and 5 are typical.
In Figure l, chambers 19 and Z0 are essentially cylindrical having an axis the same as that of stem 23.
Bellows 21 and 22 may be old in the art. For example, see the bellows in British Patent No. 1 356,783.
A single spiral spring such as spring 14 in a differential pressure unit is old in the art. See for example, spring 76 in Figure 3 of British Patent No. 843,144.
In Figure l, 19' and 19" are threaded ports allowing fluid to enter and to fill chambers 19 and 20.
Stem 23 has parts 24, 25, 26, 27 and 28. Springs 12 and 13 are substantially identical to spring 14 shown in Figure 5. Parts 24 and 25 are fixed relative to spring 13. Parts 27 and 28 are fixed relative to spring 12.
A typical countersunk screw is provided at 54.
OPERATION
-The mode of operation of the device is as follows:
If the pressure inside section 17 an~ outside bellows 21 exceeds that 1 16389~
in section 18 but outside bellows 22, stem 23 moves to the right and turns torque tube 35 clockwise. If the differential pressure is large enough, elasto-mer 51 seals against shoulder 50 ~Figure 1) and keeps excessive pressure inside and outside the bellows 21 from bursting bellows 22.
Conversely, excess pressure within section 18 will not burst bellows 21 because elastomer 37 will seal with surface 36 (Figures 1 and 2).
Otherwise, without elastomers 37 or 51 sealing, torque tube 35 is rotated an amount proportional to the difference between the pressures in sections 17 and 18.
When the pressure in chamber 20 is higher than that in chamber 19, torque tube 35 is rotated in a counterclockwise direction.
The differential pressure unit CDPU) of Figure 1 may be described as "apparatus." Central portion 29 and portions 30 and 31 may be described as a mounting ring assembly. Bellows 21 has an open end 55 and a closed end 56.
Similarly, bellows 22 has an open end 57 and a closed end 58. Discs 55 and 57 are sealed at 59 and 60, respectively, and have openings 61 and 62.
Springs 12, 13 and 14 all are disc-like planar springs fixed in the manner shown in Figure 5 to portion 31.
Springs 12, 13 and 14 may be entirely conventional, if desired. All three may have a pair of spiral slots of a polar symmetry. The same type of slots are shown in Figure 5.
Figure 4 is a vertical sectional view of the parts taken on the line 4-4 shown in Figure 3; and Figure 5 is a broken away, exploded perspective view illustrating the manner in which spiral springs are mounted in Figure 1.
The DPU shown in Figure 1 may be conventional except for arrangements 10 and 11 providing overrange valves, and spiral springs 12 and 13 which may be identical to each other and to spiral spring 14 shown in Figure 5.
The DPU assembly is held together by cap screws 15 and 16, the outer portions of the DPU including hat-shaped sections 17 and 18. Hat-shaped sections 17 and 18 have two openings thereinto, only one of which is shown at 19 in Figure 1. See also the said Jones patent.
Sections 17 and 18 provide chambers 19 and 20 in which bellows 21 and 22 are mounted.
A stem 23 extends through most of the interior of the DPU, and all 1 163~g~
parts thereto are substantially fixed relative to each other. part 24 is fixed relative to the right end of bellows 22, and is threaded to part 25. A central part 26 is threaded inside parts 27 and 25. Part 27 is threaded inside part 28.
The DPU has a central portion 29 sealed to portions 30 and 31 to which sections 17 and 18 are sealed respectively.
Seals are indica~ed at 32, 32', 33, and 33'. An arm 34 rotates a torque tube 35 responsive to reciprocation of stem 23, the operation of which and construction of which may be identical to those shown in the said Jones patent.
Due to the fact that arrangement 10 is essentially the same as an arrangement 11, although arrangements 10 and 11 are reversed, only arrangement 11 will be described in greater detail. An enlarged view of arrangement 11 is shown in Pigure 2. An elastomer s~ch as rubber at 37 is bonded to a disc 38.
Elastomer 37 is pressed against a fixed surface of an annular valve seat 36 (Pigures 1 and 2) by a plate 39 welded or sealed at 40 to hub part 25.
Note will be taken that surface 36 lies in a plane substantially transverse to the longitudinal axis of the DPU in Eigure 1 and is annular.
As shown in Figure 2, a snap ring 41 is substantially fixed in a groove 42 in part 25. When elastomer 37 is spaced from surface 36 as in Figure 1, note will be taken that disc 38 can move in a radial or in an axial direction or can tilt. This makes it possible for a good seal to be provided by elasto-mer 37 between surface 36 and the right hand surface of plate 39.
In Figure 2, note that space is provided at A so that the fit of disc 38 is somewhat loose.
Disc 38 and elastomer 37 are shown again in Figures 3 and 4 to a scale substantially the same as that to which the~ have been shown in Figure 1.
1 16389~
In Figure 3, note that disc 38 has 3 holes 43 extending completely therethrough. As shown in Figure 2, holes 43 permit the escape and ingress of an incompressible liquid respectively from and to the space between dics 38 and plate 39. Note will be taken that without holes 43, if the said spaces are sealed, stem 23 may stick with the valve of one of the arrangements 10 or ll closed.
Spring 14 shown in Figure 5 may be entirely conventional, if desired.
Screw holes are indicated at 44. Spring 13 would fit in DPU portion 31 in the same manner that spring 14 would and as shown in Figure 5. Spring 12 would be similarly mounted in DPU portion 30.
Cap screws 52 and 53 in Figures 1 and 5 are typical.
In Figure l, chambers 19 and Z0 are essentially cylindrical having an axis the same as that of stem 23.
Bellows 21 and 22 may be old in the art. For example, see the bellows in British Patent No. 1 356,783.
A single spiral spring such as spring 14 in a differential pressure unit is old in the art. See for example, spring 76 in Figure 3 of British Patent No. 843,144.
In Figure l, 19' and 19" are threaded ports allowing fluid to enter and to fill chambers 19 and 20.
Stem 23 has parts 24, 25, 26, 27 and 28. Springs 12 and 13 are substantially identical to spring 14 shown in Figure 5. Parts 24 and 25 are fixed relative to spring 13. Parts 27 and 28 are fixed relative to spring 12.
A typical countersunk screw is provided at 54.
OPERATION
-The mode of operation of the device is as follows:
If the pressure inside section 17 an~ outside bellows 21 exceeds that 1 16389~
in section 18 but outside bellows 22, stem 23 moves to the right and turns torque tube 35 clockwise. If the differential pressure is large enough, elasto-mer 51 seals against shoulder 50 ~Figure 1) and keeps excessive pressure inside and outside the bellows 21 from bursting bellows 22.
Conversely, excess pressure within section 18 will not burst bellows 21 because elastomer 37 will seal with surface 36 (Figures 1 and 2).
Otherwise, without elastomers 37 or 51 sealing, torque tube 35 is rotated an amount proportional to the difference between the pressures in sections 17 and 18.
When the pressure in chamber 20 is higher than that in chamber 19, torque tube 35 is rotated in a counterclockwise direction.
The differential pressure unit CDPU) of Figure 1 may be described as "apparatus." Central portion 29 and portions 30 and 31 may be described as a mounting ring assembly. Bellows 21 has an open end 55 and a closed end 56.
Similarly, bellows 22 has an open end 57 and a closed end 58. Discs 55 and 57 are sealed at 59 and 60, respectively, and have openings 61 and 62.
Springs 12, 13 and 14 all are disc-like planar springs fixed in the manner shown in Figure 5 to portion 31.
Springs 12, 13 and 14 may be entirely conventional, if desired. All three may have a pair of spiral slots of a polar symmetry. The same type of slots are shown in Figure 5.
Claims
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Fluid pressure responsive apparatus, said apparatus comprising: a mounting ring assembly; first and second bellows each having an open end and a closed end, said open ends being sealed around respective opposite sides of said mounting ring assembly; first and second disc-like planar springs, said first spring being fixed at its periphery to one side of said mounting ring assembly, said second spring being fixed at its periphery to the other side of said mounting ring assembly, each of said springs having a pair of spiral slots of polar symmetry; a first stem having one end fixed to the center of said first spring and another end fixed to the center of said first bellows closed end; a second stem having one end fixed to said second spring and another end fixed to the center of said second bellows closed end, the centers of said first and second springs being fixed relative to each other, said first and second springs biasing both of said first and second bellows against a differential pressure thereacross and guiding the same and said first and second stems and limiting movement of said first and second stems and said bellows approximately to an axial direction; and a housing around each of said bellows to admit fluids of the same or different pressures to the respective exteriors of each of said bellows.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000422662A CA1163896A (en) | 1979-08-03 | 1983-03-01 | Overrange valve or the like |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/063,179 US4247078A (en) | 1979-08-03 | 1979-08-03 | Overrange valve or the like |
| US063,179 | 1979-08-03 | ||
| CA000357539A CA1156126A (en) | 1979-08-03 | 1980-08-01 | Overrange valve or the like |
| CA000422662A CA1163896A (en) | 1979-08-03 | 1983-03-01 | Overrange valve or the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1163896A true CA1163896A (en) | 1984-03-20 |
Family
ID=27166773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000422662A Expired CA1163896A (en) | 1979-08-03 | 1983-03-01 | Overrange valve or the like |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1163896A (en) |
-
1983
- 1983-03-01 CA CA000422662A patent/CA1163896A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |