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Title:
FULL FLOW MECHANICALLY ACTIVATED RUPTURE VALVE
Document Type and Number:
WIPO Patent Application WO/1991/012451
Kind Code:
A1
Abstract:
A fluid relief disc valve (20), to be used to quickly empty a fluid from a container (27), comprising a valve body (22) having a hollow interior (24) defined by a surrounding wall (26); the valve body (22) having a fluid inlet opening (28) and a fluid outlet opening (30) communicating with the hollow interior (24); a disc (36) positioned laterally across the valve body hollow interior (24) and completely sealing the hollow interior (24) against fluid flow through the valve (20); and a rod (66) extending from outside the valve body (20) into the hollow interior (24) for applying a force for severing the disc (36) adjacent the surrounding wall so that a severed portion is formed and displaced to provide full fluid flow through the hollow interior (24) essentially unobstructed by the severed portion.

Inventors:
Degraaf
Douglas
Warren, Brogren
Erik
Edward
Application Number:
PCT/US1991/000716
Publication Date:
August 22, 1991
Filing Date:
February 04, 1991
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
CHICAGO BRIDGE & IRON TECHNICAL SERVICES COMPANY.
International Classes:
F16K17/16; F16K17/40; (IPC1-7): F16K17/40; F17C13/06
Foreign References:
US1921411A
US2712881A
US3001536A
US3342162A
US3272374A
Download PDF:
Claims:
WHAT IS CLAIMED IS:
1. A fluid relief disc valve comprising: a valve body having a hollow interior defined by a surrounding wall; the valve body having a fluid inlet opening and a fluid outlet opening communicating with the hollow interior; a disc positioned laterally across the valve body hollow interior and completely sealing the hollow interior against fluid flow through the valve; and mechanical means extending from outside the valve body into the hollow interior for severing the disc adjacent the surrounding wall so that a severed portion is formed and displaced to provide full fluid flow through the hollow interior essentially un¬ obstructed by the severed portion.
2. A fluid relief disc valve according to claim 1 in which: the disc is positioned adjacent to either the inlet or outlet opening.
3. A fluid relief valve according to claim 1 in which: the disc is formed of solid sheet material; the disc has a peripheral edge portion; and the peripheral edge portion is releasably sealed fluid tight between a flange seat in the hollow interior surrounding wall and a removable ring.
4. A fluid relief valve according to claim 3 in which the ring is bolted to the flange seat. '.
5. A fluid relief valve according to claim 1 in which: one end of a rod is connected to the disc, the rod extends through the hollow interior surrounding wall and the rod terminates in a second end outside of the valve body; the disc is formed of solid sheet material of substantially uniform thickness except for a sub¬ stantially circular thinner area adjoining the valve hollow interior surrounding wall; and the rod second end has means for applying a force to the rod to cause the disc to sever along the disc thinner area;.
6. A fluid relief valve according to claim 5 in which: the rod second^end is connected to a plate means; a bellow means surrounds the rod portion external of the valve body; and the bellow means has one"end connected to the valve body and a second end connected to the plate means.
7. A fluid relief valve according to claim 6 in which: the plate means has a connector for applying one of a tensile and compressive force thereto.
8. A fluid relief valve according to claim 1 in which: a rod extends through the hollow interior surrounding wall; the rod has a first end inside the valve hollow interior; the rod first end has a circular knife means mounted thereon with a cutting edge axial to the rod and adjacent the disc and adjoining the hollow interior surrounding wall; and the rod extends through the hollow interior surrounding wall and terminates outside of the valve body in a second end having means for applying a force to the rod to cause the circular knife cutting edge to sever the disc.
9. A fluid relief valve according to claim 8 in which: the rod second end is connected to a plate means; a bellow means surrounds the rod portion external of the valve body; and the bellow means has one end connected to the valve body and a second end connected to the plate means.
10. A fluid relief valve according to claim 9 in which: the plate means has means for applying a com pressive force thereto.
11. A combination comprising: a container having a fluid stored therein which circumstances may require be rapidily removed therefrom under emergency conditions; a fluid relief disc valve in fluid com¬ munication with the container; the disc valve having a valve body with a hollow interior defined by a surrounding wall; the valve body having a fluid inlet opening and a fluid outlet opening com¬ municating with the hollow interior; the fluid inlet opening being in fluid communication with the container; a disc positioned laterally across the valve body hollow interior and completely sealing the hollow interior against fluid flow through the valve; and mechanical means extending from outside the valve body into the hollow interior for severing the disc adjacent the surrounding wall so that a severed portion is formed and displaced to provide full fluid flow through the hollow interior essentially un obstructed by the severed portion.
12. A combination according to claim 11 in which: the disc is positioned adjacent to either the valve inlet or outlet opening.
13. A combination according to claim 11 in which; the disc is formed of solid sheet material; the disc has a peripheral edge portion; and the peripheral edge portion is releasably sealed fluid tight between a flange seat in the hollow interior surrounding wall and a removable ring.
14. A combination according to claim 11 in which: one end of a rod is connected to the disc, the rod extends through the hollow interior surrounding wall and the rod terminates in a second end outside of the valve body; the disc is formed of solid sheet material of substantially uniform thickness except for a sub¬ stantially circular thinner area adjoining the valve hollow interior surrounding wall; and the rod second end has means for applying a force to the rod to cause the disc to sever along the disc thinner area.
15. A combination according to claim 14 in which: the rod second end is connected to a plate means; a bellow means surrounds the rod portion external of the valve body; and the bellow means has one end connected to the valve body and a second end connected to the plate means.
16. A combination according to claim 11 in which: a rod extends through the hollow interior surrounding wall; the rod has a first end inside the valve hollow interior; the rod first end has a circular knife means mounted thereon with a cutting edge axial to the rod and adjacent the disc and adjoining the hollow interior surrounding wall; and the rod extends through the hollow interior surrounding wall and terminates outside of the valve body in a second end having means for applying a force to the rod to cause the circular knife cutting edge to sever the disc.
17. A combination according to claim 16 in which: the rod second end is connected to a plate means; a bellow means surrounds the rod portion external of the valve body; and the bellow means has one end connected to the valve body and a second end connected to the plate means. ;.
18. A method for opening a flow conduit for emergency removal of a fluid product from a container comprising: attaching a fluid relief disc valve to the container; > the disc valve having a valve body with a hollow interior defined by a surrounding wall; the valve body having a fluid inlet opening and a fluid outlet opening com¬ municating with the hollow interior; the fluid inlet opening being in fluid communication with the container; and a disc positioned laterally across the valve body hollow interior and completely sealing the hollow interior against fluid flow through the valve; and when it becomes necessary for emergency removal of fluid product from the container, severing the disc adjacent the surrounding wall by mechanical means extending from outside the valve body into the hollow interior so that a severed portion is formed and displaced to provide full .fluid flow through the hollow interior essentially unobstructed by the severed portion.
19. A method according to claim 18 in which a cryogenic liquid is stored in the container.
20. A method according to claim 19 in which the cryogenic liquid is liquid helium.
21. A method according to claim 18 in which: the disc is formed of solid sheet material; the disc has a peripheral edge portion; and the peripheral edge portion is releasably sealed fluid tight between a flange seat in the hollow interior surrounding wall and a removable ring.
22. A method according to claim 18 in which: one end of a rod is connected to the disc, the rod extends through the hollow interior surrounding wall and the rod terminates in a second end outside of the valve body; the disc is formed of solid sheet material of substantially uniform thickness except for a sub¬ stantially circular thinner area adjoining the valve hollow interior surrounding wall; and the rod second end has means for applying a force to the rod to cause the disc to sever along the disc thinner area.
23. A fluid relief valve according to claim 22 in which: the rod second end is connected to a plate means; a bellow means surrounds the rod portion external of the valve body; and the bellow means has one end connected to the valve body and a second end connected to the plate means.
24. A fluid relief valve according to claim 23 in which: the plate means has a connector for applying one of a tensile and compressive force thereto.
25. A fluid relief valve according to claim 18 in which: a rod extends through the hollow interior surrounding wall; the rod has a first end inside the valve hollow interior; the rod first end has a circular knife means mounted thereon with a cutting edge axial to the rod and adjacent the disc and adjoining the hollow interior surrounding wall; and the rod extends through the hollow interior surrounding wall and terminates outside of the valve body in a second end having means for applying a force to the rod to cause the circular knife cutting edge to sever the disc.
26. A fluid relief valve according to claim 25 in which: the rod second end is connected to a plate means; a bellow means surrounds the rod portion external of the valve body; and the bellow means has one end connected to the valve body and a second end connected to the plate means.
Description:
FULL FLOW MECHANICALLY ACTIVATED RUPTURE VALVE

This invention ' relates to fluid relief or dump valves. More particularly, this invention is concerned with a fluid relief or dump valve which provides full fluid flow by severing a laterally positioned sealing disc along the valve wall interior surface.

BACKGROUND OF THE INVENTION

Fluids are stored in various tanks and vessels and are also used in industrial apparatus for various purposes. At times it may be necessary to remove, vent or transfer the fluid very quickly for safety reasons or to put the fluid to use for some purpose. This requires the incorporation of one or more fast acting relief or dump valves.

Many of the available valves through which the fluid must flow undesirably restrict the flow because of decreased internal flow paths. Other valves designed for maximum flow have difficulty seating fluid tight, especially with fluids having low viscosity. This is a problem when the valves are large in cross-sectional area and the seating material is rigid or non- compliant; Cryogenic valves are particularly difficult to seat leak-tight due to the fact that materials compliant at room temperature become noncompliant at cryogenic temperatures: Additionally, valves which are tight sealing at room temperature may not seat properly when cooled down due to thermal differential movement associated with dissimilar materials having different coefficients of thermal expansion.

Tight sealing valves also generally require large opening and closing actuating forces which must be counteracted through the system components.

Additionally, opening times for such valves are generally undesirably slow.

From the above discussion it is believed clear that a need exists for a rapid acting fluid relief or dumping valve which provides an essentially completely fluid tight seal over a very wide range of temperatures from elevated to very low cryogenic temperatures during normal use of the valve up to the time it is opened.

SUMMARY OF THE INVENTION

According to the invention a fluid relief disc valve is provided comprising a valve body having a hollow interior defined by a surrounding wall; the valve body having a fluid inlet opening and a fluid outlet opening communicating with the hollow interior; a disc positioned laterally across the valve body hollow interior and completely sealing the hollow interior against fluid flow through the valve; and mechanical means extending from outside the valve body into the hollow interior for severing the disc adjacent the surrounding wall so that a severed portion is formed and displaced to provide full fluid flow through the hollow interior essentially unobstructed by the severed portion.

Also provided by the invention is a com¬ bination comprising a container having a fluid stored therein which circumstances may require be rapidily removed therefrom under emergency conditions; a fluid relief disc valve in fluid communication with the con¬ tainer; the disc valve having a valve body with a hollow interior defined by a surrounding wall; the valve body having a fluid inlet opening and a fluid outlet opening communicating with the hollow interior; the fluid inlet opening being in fluid communication with the container; a disc positioned laterally across the valve body hollow

interior and completely sealing the;hollow interior against fluid flow through the valve; and mechanical means extending from σutsjide the 1 valve body into the hollow interior for severing the disc adjacent the surrounding wall so that "a severed portion is formed and displaced to provide full fluid flow through the hollow interior essentially unobstructed by the severed portion.

The invention also provides a method for opening a flow conduit for emergency removal of a fluid product from a container comprising attaching a fluid relief disc valve to the container; the disc valve having a valve body with a hollow Interior defined by a surrounding wall; the valve body having a fluid inlet opening and a fluid o tlet opening communicating with the hollow interior; the fluid inl€ft opening being in fluid communication with the container; a disc positioned laterally across the valve body hollow interior and completely sealing the hollow interior against fluid flow through the valve; and when it becomes necessary for emergency removal of fluid product from the container, severing the disc adjacent the surrounding wall by mechanical means" extending from outside the valve body into the hollow interior so that a severed portion is fofited and displaced to provide full fluid flow through the hollow interior essentially unobstructed by the severed portion. "

The disc can be positioned at any suitable location in the valve hollow interior but is desirably located adjacent to one of the inlet and outlet openings.

The disc c'an be formed of solid sheet material. The disc peripheral edge portion can be releasably sealed fluid tight between a flange seat in the hollow interior surfc iihding wall and a removable ring. The ring can be bolted to the flange seat to

compress the disc peripheral edge portion between the ring and the flange.

In one embodiment of the invention one end of a rod can be connected to the disc. The rod can extend through the hollow interior surrounding wall and terminate in a second end outside of the valve body. The disc can be formed of solid sheet material of sub¬ stantially uniform thickness except for a substantially circular thinner area adjoining the valve hollow interior surrounding wall. The rod second end can have means for applying a force to the rod to cause the disc to sever along the disc thinner area so that the severed portion can be bent or hinged out of the way or be severed completely free. To prevent escape of fluid from the valve the rod second end can be connected to a plate means with a bellows means surrounding the rod portion external of the valve body. The bellows means can have one end connected to the valve body and a second end connected to the plate means. Furthermore, the plate means can have a connector for applying one of a tensile or com- pressive force thereto.

According to a second embodiment of the fluid relief valve a rod can extend through the hollow interior surrounding wall and have a first end inside the valve hollow interior. The rod first end can have a circular knife means mounted thereon with a cutting edge axial to the rod and adjacent to the disc and adjoining the hollow interior surrounding wall. The rod can extend through the hollow interior surrounding wall and terminate outside of the valve body in a second end having means for applying a force to the rod to cause the circular knife cutting edge to sever the disc.

The rod second end of this second embodiment can. be connected to a plate means; a bellows means can surround the rod portion external of the valve body; and

the bellow means can have one end connected to the valve body and a second end connected to the plate means. The plate means can have means for applying a compressive force thereto. The fluid relief valve provided by the invention is extremely fast opening and opens readily with low actuation force. Valve sealing or seating is leak tight against both liquids and gases, including liquefied helium. Sealing of the disc in the valve body can be readily accomplished by means of a defor able gasket or the disc itself may be deformed around its periphery. Resistance to-fluid flow is essentially avoided because the disc is readily severed close to or adjoining the interior surface of the valve wall. The construction of the valve and its operation make it useful at low cryogenic temperatures as well as at room temperature and elevated temperatures.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is an elevational view, partially broken away and in section, of a first embodiment of a fluid relief disc valve according to the invention; Figure 2 is a sectional view taken along the line 2-2 of Figure 1;

Figure 3 is an enlarged view of the encircled structure in Figure 1 and given the number 3;

Figure 4 is a sectional view of a second embodiment of a fluid relief disc valve according to the invention;

Figure 5 is an enlarged view of the encircled structure in Figure 4 and given the number 5;

Figure 6 is a view, partially broken away, taken along the line 6-6 of Figure 4; and

Figure 7 is a sectional view taken along the line 7-7 of Figure 6.

DETAILED DESCRIPTION OF THE DRAWINGS

To the extent it is reasonable and practical the same or similar elements which appear in the various views of the drawings will be identified by the same numbers. With reference to Figure 1 the fluid relief disc valve 20, consisting the first embodiment of the invention, has a body 22 with a hollow interior 24 defined by a surrounding wall 26. The valve body 22 has a fluid inlet opening 28 circular in lateral section, and a fluid outlet opening 30, also circular in lateral section. The fluid inlet can be in fluid communication with container 27 having a volume of liquid or gas. The valve body 22 has an internal lateral circular flange or ledge 32 located adjacent the inlet opening 28. The radial flat peripheral portion 34 of disc 36 is positioned in contact with the circular flange 32. The disc 36 is formed of solid sheet material of uniform thickness. The disc 36 has a central portion dished upwardly so as to present a convex surface against fluid present on the inlet opening side of the valve. The disc, however, can be flat or convex when viewed from outside of the inlet opening.

The disc 36 is releasably secured fluid tight against the flange 32 by ring 40 and bolts 42 which extend through the removable ring into the flange 32. The disc is thus positioned laterally across the valve body hollow interior and completely seals the hollow interior against fluid flow through the valve. A discontinuous groove or score line 46 is located on the top surface of disc 36 adjoining the

interior surface 44 of wall 26 (Figures 2 and 3). The groove 46 is nearly a complete circle, with only the distance 48 (Figure 2) between the ends of the groove remaining devoid of a groove. This grooveless portion functions as a hinge when the disc 36 is severed or torn along the line of the groove when the valve is opened.

The valve body 22 also has a third opening 50 essentially in axial alignment with the inlet opening 28 so that the valve body is substantially T-shaped with the outlet opening 30 lateral to the inlet and third openings.

A flange 52 surrounds and helps define the third opening 50. Plate 54 is removably secured to ring 54 by bolts 56. Deformable seal ring 58 is positioned in circular seats provided in the inner peripheral axial areas of flange 52 and ring 54. Each circular seat can have an outwardly directed circular sharp peaked ridge which squeezes into the seal ring 58, which can be made of copper or some other soft metal, when the ring 54 is tightened into position.

Plate 60 is welded to the outside of the surface of ring 54. One end of bellows 62 is welded to plate 60 and to plate 64. The outer end of rod 66 is joined to the inner side of plate 64 and connector finger 68 is joined to the outer -side of plate 64. Finger 68 has an opening 70 to which a suitable actuating means, not shown, can be connected to apply a tensile force on rod 66.

The inner end of rod 66 has a clevis 72 with a pair of elongated holes 74 which receive pin 76. Pin 76 is positioned in tab 78 joined to the inner side of disc 36. The elongated holes 74 provide a limited freedom of movement which permits assembly of the valve in a suit¬ able pipeline or vessel relief system and appropriate adjustment without putting undesirable, tension on rod 66 when in stand-by condition. Fluid in container 27 to

which the valve is connected, as previously described, will also be present in the inlet opening 28.

When it is desired to open the valve 20 an appropriate tensile force is applied to rod 66 to pull disc 36 inwardly or downwardly. The tensile force rapidly causes the disc to tear along the groove 46 and to hinge or bend along the distance 48 which lacks the groove. Continued pulling on rod 66 results in the disc being swung to the side out of the way so that fluid, whether a gas or liquid, can flow unhindered from the fluid inlet opening 28, as well as container 27 in fluid communication therewith, through outlet 30. By hinging the disc and keeping it connected to rod 66 the disc is prevented from moving through the liquid outlet and possibly blocking flow of fluid somewhere downstream. A second embodiment of the invention is illustrated by Figures 4 to 7.

With reference to Figure 4, the fluid relief valve 80 has a body 82 with a hollow interior 84 defined by walls 86, 88. The body 82 has an inlet opening 90 and an outlet opening 92.

The outlet opening 92 is defined in part by a circular flange 94 joined to the wall 86. Ring 96 is removably connected to flange 94 by bolts 98. Ring 96 is connected to the end of conduit 97 which can com¬ municate with a tank or other container or to the atmosphere. Each of flange 94 and ring 96 is provided with a circular seat in their inner peripheral axial areas. Thus, flange 94 has a seat 100 and ring 96 has a seat 102. These seats face each other and, as shown, are mirror images of each other. Each circular seat has an outwardly directed circular sharp peaked ridge 104 which squeezes into the peripheral side portions of disc 106 (Figure 5). The disc 106 can be made of a soft metal sheet, desirably of uniform thickness, such as copper. Such a disc when compressed as described

- 9 -

provides a leak proof seal against essentially all fluids, including liquefied helium and hydrogen. The disc 106 is provided with a circular groove 107 located axially in the disc. The disc is sufficiently wide so as to span the inner radial edges of flange 94 and ring 96.

A cylindrical circular knife 108 is axially located partially inside the circular outlet opening of flange 94 (Figures 4 and 7). The sharp forward cutting edge 110 of knife 108 is scalloped in that it curves downwardly and upwardly between the two diametrically located sharp metal piercing points 112, 114.

Axial movement of the circular knife 108 is guided by the circular opening in flange 94 and also by four radially positioned guide members 116 equally spaced around the knife and joined to flange 94 and wall 86. Clearance is provided around the outer surface of knife 108 so that it is freely movable through any temperature cycle it may experience. Four equally spaced-apart radially positioned spokes 118 of equal length join the knife 108 to hub 120. Hub 120 is removabl connected to the inner end of rod 130 by bolt 122.

The valve body 82 has a plate 132 spaced axially away from outlet opening 92. The plate 132 has an axial hole 134 througfe which rod 130 extends out¬ wardly. Plate 136 is welded to the outside surface of plate 132. One end of bellows 138, which surrounds rod 130, is joined to plate 136 and the other end of the bellows is joined to plate 140 which is welded to rod

130. The described arrangement permits the interior of the valve, and the bellows interior, to contain fluid, whether it be gas or liquid, at all times without leakage when the valve is in stand-by condition. Cylindrical shell 142 surrounds bellows 138.

Ring flange 144 is joined to the outside of shell 142

and is removably or releasably connected to plate 132 by bolts 146. The outer end of shell 142 is closed by a circular plate 148 except for an axial hole containing a gasket 150 through which rod 130 projects. The shell 142 includes an outwardly projecting semicircular extension 152 having a slot 154 at the bottom in which operating lever 156 is positioned. Two spaced apart support members 158 are joined to extension 152, with one on each side of slot 154. Pin 160 extends through lever 156 and the two members 158 thereby pivotally joining the lever to extension 152.

The upper end of lever 156 is provided with a roller 162 mounted on pin 164. The roller 162 contacts the laterally flat outer end of rod 130. The lower end of lever 156 has a hole 166 which is provided so that the lever can be attached to a means for applying a tensile force to the lever in the direction of the arrow.

When a tensile force is applied as described to lever 156 roller 162 applies a compressive force to rod 130 which then forces the knife 108 into severing contact with that portion of the disc 106 which con¬ stitutes the bottom wall of groove 107. The knife cuts through the bottom wall 109, which is the thinnest portion of the disc. The knife severs a circular sheet portion from the disc and thereby provides a circular full size opening in the valve through which fluid can flow essentially unobstructed. The cut-out circular sheet portion is permitted to flow downstream un- restricted so that this embodiment is intended to be used where there is no reasonable chance that it will lodge somewhere and restrict or retard fluid flow.

The described valves have reduced resistance to flow compared to conventional valves. The valves provided by the invention are extremely fast opening and provide essentially full fluid flow for liquids and

gases, as well as cryogenic liquids. Actuation forces needed to sever the discs are very low. Also, seating is leak tight, even against liquefied helium.

The foregoing detailed description has been given for clearness of understanding only, and no un¬ necessary limitations should be understood therefrom, as modifications will be obvious to those skilled in the art.