JPS5989871A - Fireproof ball valve - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to valve structures, and more particularly to fire protection or fire resistant overlays.

When a valve is said to have fire resistance I, it means that the valve satisfies certain specific conditions in the event of a fire. 36th Annual Symposium on Processing Industry Instrumentation? In the Gium Newsletter (Texas AGM University, 1981),
Please see the overview of fire valves by Mr. Aran. 6 Various organizations have published various combinations of conditions for fire-resistant valves, and the valve industry has Unfortunately, a unified standard has not yet been approved. According to one of these unofficial standards (American Petroleum Institute 607), basically, if the temperature of the valve body is 11007 or higher,
A valve is considered to be fire rated if it maintains a substantially liquid seal in the closed position for a period of 10 minutes or more. Valves with a leak-proof structure for use in the event of a fire that do not meet the above standards are generally recognized as fire-resistant valves.

The present invention is particularly suitable for '! # This valve is suitable for application to the improved soft part fireproof ceiling and the valve seat assembly of the divine valve called ``Floating Ball'', and the explanation will be given below with particular reference to these valves and valve seats. We will do so. However, it will be readily understood that the present invention is applicable not only to the above-mentioned applications but also to a wider range of applications, and to other types and formats of squares.

Commercial overgrowth is typically Teflon (E, I).

duPont de Nemours and Cor
A thyroid-shaped valve seat or seat ring made of elastic and deformable plastic such as Npany's registered area) is used to seal and secure the valve. The pair of seat rings are
It is placed adjacent to the population and exit opening of the cell. The ball itself is in the valve closed position and under hydraulic pressure.
It is installed so that it can move somewhat freely, that is, it can move a lot in the axial direction of the valve seat. This is because the movement of the balls causes the downstream seat ring to deflect and deform, increasing the degree of sealing engagement with the balls. The degree of deflection of the seat ring changes depending on the hydraulic pressure.

In the event of a fire, the current soft seats of conventional floating ceilings will be destroyed by the heat of the fire, causing damage to the valves and making them unusable. Typically, downstream of the ball, the valve seat breaks down in a sequence in which the plastic first softens and then begins to flow or protrude from the valve orifice. If the FM continues to heat up further, the valve seat will eventually carbonize and sublimate, or evaporate. When the plastic valve seat is broken, the ball moves further under hydraulic pressure to the point where it engages the secondary valve seat. The secondary valve seat is typically a support for the plastic valve seat. Consists of radial, inwardly directed protrusions of the valve body, such as shoulders, made of metal or flame-retardant material. Normally, the surface of the secondary valve seat is not designed to have a highly sealing engagement with the ball, so
It is virtually impossible to prevent leakage.

Another special problem arises when a fire destroys only a portion of the valve seat of the plastic snack. For example, when only one side of the valve receives radiant heat from a fire, or when the fire is not that serious, only the portion of the valve seat near the fire may soften and protrude into the valve opening. In this case, when the ball is subjected to hydraulic pressure, it will move towards the area made possible by the protrusion, and will no longer be able to make horizontal contact with the secondary valve seat, resulting in a large leakage path. There may also be a case where the ball is held by the undamaged portion of the glass valve seat and does not come into contact with the secondary valve seat at all, but in this case as well, a large leakage path is created. Te L5 mau. In either case, liquid rushes out of the leak path and cools the valve. Even if a fire continues, this rapid cooling action prevents the valve seat from further deterioration and typically leaves the valve in a state where a large amount of liquid leaks.

An often overlooked problem that occurs during a fire is the sudden rise in fluid pressure caused by the heating of the fluid trapped around the ball between the valve inlet and outlet valve seats. It is. Heat from a fire can heat the liquid, which is held between the valve seats in the center of the valve, causing it to vaporize. The fire was so intense that the liquid evaporated rapidly,
It is often the case that the pressure inside the valve increases excessively because it cannot keep up with the speed at which it escapes through the valve seat. The pressure inside the valve can easily exceed the valve's rated pressure, rupturing seals at the stem packing and valve body joints, or even rupturing the valve body itself.

Another practical problem arises when a fire hose is directed into the volatile liquid system of a valve that is heated by a fire. Due to the quenching action of the hose water, the hot steam inside the valve condenses extremely rapidly, causing the balls to move around and stir up char, waste, and dirt, which cause contact between the balls and their sealing surfaces. It will get stuck in between and provide further leakage paths.

In the various fireproof or refractory ball valve seat designs, the common goal is to create a valve that will seal with conventional valve seat materials under normal operating conditions and that will also seal in the event of a fire. It is to obtain. Over the years, various shapes and types of ceiling seats have been devised and employed in the industry to construct fireproof or fireball valves, but their effectiveness has varied widely. The most common drawback of conventional fireproof or fireball valves is that the device itself has very little economic and practical value.

Common types of fireball valves include a soft part made of plastic material such as Teflon, and a secondary valve made of metal or high-temperature composition material to support the valve when the valve bulge is destroyed by fire. Has a seat. The secondary valve seat typically consists of a metal rim or washer inserted between the soft plastic primary valve seat and the supporting shoulders of the valve body. However, this design does not avoid the drawbacks peculiar to metal-to-metal seals.

In other words, in the Ukitama Daiben, the ball can be perfectly spherical, and the mini-next metal valve seat cannot be perfectly circular either, so after the -next valve seat is destroyed in a fire. , the ball can make complete annular contact with the metal valve seat, and in applications such as fireproofing where considerable leakage is usually observed from the secondary valve seat, a strict leak-proofing function is required. In the case of metal-to-metal seals, one sealing surface must be mated to the other and polished or polished. It must be said that such a process is very expensive and that interlocking and overlapping cannot be used for economical reasons in the manufacture of fireproof or fireproof ball valves. Furthermore, the interlocking type secondary valve seat is easily damaged by corrosion, pitting, peeling, erosion, etc., which occur as a result of normal operation of the valve. There is also the risk of becoming overwhelmed by the fact that something is being lost. Drawing with secondary metal valve seats or valve seats of high-temperature composition materials, in addition to the above, - Partial deterioration of secondary valve seats and problems associated with rapid cooling, and flying of carbides and waste due to rapid cooling. or have blockage problems.

Improvements that have been made to overcome the drawbacks of metal secondary valve seats include constructing the secondary valve seat with a heat-resistant material that is more elastic and more deformable than metal. Typically carbon or graphite rings are used, and while these types of secondary valve seats offer improved operation while new, they have been found to be particularly susceptible to damage during normal operation. . Compared to ordinary plastic valve seats, carbon or graphite valve seats are
Because of their brittleness and low strength, this type of secondary valve seat is easily damaged due to normal wear associated with valve operation, erosion during opening, and loss due to foreign objects. Therefore, in this type of design, in order to prevent leakage when the secondary 5P seat is damaged,
It is further equipped with a metal lip rim as the final or tertiary valve seat. However, despite the increased size, complexity, and manufacturing cost of such multilayered valve seats, the reliability of the sealing function has been significantly improved. Both valve seats are likely to fail when any of the factors such as wear, erosion, foreign matter, etc., can cause failure of one valve seat. This is because during normal operation, all valve seats are used frequently. Another method devised and proposed for making fireproof valves is to add 79 points to conventional valves. One method is to add enough insulation to insulate the valve for a period of time long enough to achieve its fire rating. Another method proposed is to install sprinklers near the valve to cool the valve in the event of a fire. However, both proposals require high installation and maintenance costs and are not suitable for practical use. Furthermore, a fully insulated box has the disadvantage that it is difficult to confirm whether the insulation means have been correctly reinstalled each time valve maintenance is performed.

Accordingly, it has been desired to develop a fireball valve and valve seat assembly that operates satisfactorily under normal operating conditions and which seals the valve in its closed position in the event of a fire.

Preferably, the throttle valve and valve seat are designed to eliminate the need for expensive sprinklers or insulating packing to protect the valve.

The present invention devises a new and improved structure that overcomes all of the above-mentioned problems and other problems, has a high sealing force,
The object of the present invention is to provide a new and improved fireproof floating ball substitute and soft part assembly that effectively prevents leakage in any fire that may actually occur.

Main #4 also seeks to devise a wide variety of valve seat designs and materials that can achieve optimal sealing under a variety of normal operating conditions.

Generally speaking, the present invention devises a new and improved fireball valve and valve seat assembly, the composite valve seat member assembly according to the present invention comprising: - a soft plastic valve seat member or ring; and a secondary valve seat member made of a deformable heat-resistant material. The secondary valve seat member is a member for sealing the valve when the secondary valve seat ring is partially or completely destroyed due to fire or other heat exposure. A pair of such assemblies are disposed oppositely on opposite sides of the ball and are continuously pushed toward the ball to maintain the ball in position within the valve body and provide a valve seal.

In particular, the invention is particularly suitable for use in valves of the type having a valve body having a central passageway and a ball member located within the passageway and having an opening for the flow of liquid. The ball is
The valve is provided for selective rotation between an open position and a closed position to control the flow of liquid through the valve. A pair of radially inwardly extending scraps are disposed facing each other along the circumference of the passageway with a ball member in between. The passageway has a pair of counterbores disposed on opposite sides of the ball member, each counterbore having an interior end wall facing an associated side of the layer, and a pair of composite valve seat assemblies axially disposed within the passageway.・Each assembly consists of a reinforcing ring and a soft plastic valve seat jig. It has a valve seat member. The reinforcing ring has a central opening and is adjacent to an associated one of the end walls of the counterdeer. Soft valve rings are usually
It is installed so as to rotate and flex toward and away from the reinforcing ring, and is adjacent to the opposite side of the reinforcing ring from the side that contacts the counterbore end wall. The seat ring has a central opening and a ball mating surface facing the top member. The surface that engages with the nucleus performs a sealing engagement with the upper member. A secondary valve seat member is inserted between the valve seat ring and one of the associated scraps. The secondary valve seat member is comprised of a deformable heat-resistant secondary valve seat ring. The secondary valve seat ring is
Preferably, the secondary valve ff +7 is made of a material containing a foamed carbonaceous material, and the secondary valve ff +7
The ring is configured to engage the ball and seal the valve.

According to another aspect of the invention, the secondary valve seat is constructed from a combination of a disc spring and a sheet of foamed carbonaceous material. When unstressed, a disc spring typically has a right circular cone shape. The sheet of foamed carbonaceous material is typically radially coextensive with the disc spring and inserted at least partially between the spring and the noft deplastic valve seat ring. The disc spring continuously pushes against the opposing sides of the sheet of carbonaceous material - thus pushing the soft valve seat ring towards the upper member. If a portion of the valve seat ring is damaged due to a fire, the opposing surfaces of the carbonaceous material sheet will come into contact with the upper member to form a liquid seal.

According to yet another aspect of the invention, the secondary valve seat includes a pair of sheets of expanded carbonaceous material. The pair of seats sandwich the disc spring and usually spread radially over the same area as the disc spring. The first seat faces the upper member 7 and engages with the upper member when the valve seat ring is damaged.

A second sheet faces an associated one of the pair of radially inwardly extending debris and sealingly engages the layer upon failure of the seat ring.

According to yet another aspect of the invention, a weir ring is used for the secondary valve seat ring. The weir ring is typically inserted between the secondary valve seat ring and the secondary valve seat member.

According to yet another aspect of the invention, the top member has a second opening in a direction perpendicular to the first opening for liquid flow. The second opening is provided so as to face the inlet of the valve when the upper member is in the closed position, and connects the liquid collected in the center of the valve with the liquid in the inlet.

A primary object of the present invention is to provide a new and improved fireball valve and valve seat assembly that exhibits good liquid sealing properties even when the valve is exposed to fire or high heat.

Another object of the present invention is to provide the above extension and valve seat assembly that avoids metal-to-metal sealing.

Still another object of the present invention is to provide an overstretcher that can maintain its liquid sealing function even when some of the soft plastic valve seat members are partially or completely destroyed due to fire.

Still another object of the present invention is to provide a drawing seat for preventing the protrusion of the valve seat ring and the intrusion of carbide and dirt generated by a fire between the upper member and the ball engagement sealing surface. The assembly is provided.

Still another object of the present invention is to provide a secondary valve seat f:lP that functions in the event of fire and failure of the upper extension, regardless of the design and materials of construction of the secondary valve seat. The purpose is to provide a secondary valve seat that does not deteriorate over time during normal operation.

Still another object of the present invention is that when the valve is exposed to high temperature and dies,
It is a further object of the present invention to provide a fireball valve that prevents the build-up of destructive high pressures within the valve body and seat assembly. The present invention also provides a drawing part assembly having a secondary valve seat that is free from wear.

Hereinafter, the present invention will be explained along with the drawings. The drawings illustrate preferred embodiments and some selective embodiments of the invention and are not intended to limit the invention.

FIG. 1 shows an upper extension having a pair of opposing valve seat assemblies B disposed on opposite sides of a floating spherical ball C. In FIGS. 1 and 7, the upper extension A has a barrel or housing generally indicated at 10. In FIGS.

The barrel 10 has a central portion 12 and opposed end fittings 14,16. A valve seat assembly B and a ball C are mounted within the valve body central portion 12, with the ball member being mounted for selective rotation by an actuation handle assembly and stem, generally indicated at 8. There is. Pressure member C has a first or primary fluid flow opening 15 . The opening 15 spans the diameter of the pressure member and provides a passageway for fluid flow from the inlet to the outlet when the valve is in the open position in the stomach. The second opening 17 of the ball C is provided perpendicularly to the main opening 15, and is normally provided so as to face the inlet of the valve when the valve is in the closed position, so that the liquid in the center of the valve and The fluid pressure is communicated to the fluid in the valve inlet. Virtually all other parts of the valve shown in FIG. 1, except for the valve seat assembly, can be modified to accommodate different types and styles of drawing than the valve shown in FIG.

However, for convenience in describing the invention, the valve body will be assumed to have a generally cylindrical central passageway or axially extending fluid flow opening 20 slightly larger than the diameter of the pressure member C. Each end fitting 14,16 is connected to the valve body central portion 1 by a plurality of longitudinally extending ties (generally indicated at 22).
2. Tie bolts 22 were provided on opposite end fittings 14.16? It is inserted into the seat hole 24 and retained within the valve body central portion 12 (see FIG. 7). It has been found that the structure in which a plurality of bolts 22 are held in the valve body central portion 12 in this manner is particularly excellent for fire protection.

That is, long tie bolts are often prone to bending or breaking when the valve is heated in a fire and then rapidly cooled down by water from a fire hose or sprinkler. , this problem can be avoided. During a fire, the metal parts of the valve heat up and expand. When a firefighter directs a fire hose at a heated and expanded valve, the surrounding area of the valve, including the tie bolts, cools and contracts faster than the valve body. As a result, the tie belt 22 is eventually bent or destroyed. Therefore, the aforementioned problems can be reduced by using a plurality of short, low-slung tie bolts. End fitting 14.
16 is further provided with internal threads 26% 28 or other suitable means to facilitate connection of the valve with associated fluid systems or piping.

The stem and actuation handle assembly 18 includes a stem member 30
The lower end 32 of the stem member is slidably received in a slot or groove provided in the upper end of the ball C, as shown. According to this structure, the ball is in the open position 1# of the valve and in the closed position f
When the valve is in the closed position and hydraulic pressure is applied to the ball while being able to rotate between positions i, the ball is capable of some automatic movement axially within the passage 20 of the valve body. .

The stem member 30 has an opening 36 in the central portion 12 of the valve body.
extends outward through the A ring 38, 40, 42 which can be exposed to high temperatures is placed in the opening :) 6,
The opening 36 and the stem member are sealed and held together. As shown, the lower 74' fitting ring 42 rests on a 74' flange 44 that extends into the interior 1111 formed within the opening 36. Beneath the flange 44, a thrust washer 46 capable of withstanding high temperatures is installed to support the outwardly extending scrap or stem member 3.
The flange 48 formed at the base of the 0 is recirculated. The stem 30ti, locking gland 50, and locking nut 52 hold the stem 30ti in place.

As shown in Figure 1, by tightening the nut 52, a compressive force is applied to the ring 38, 40, 42, causing the ring to expand radially to form a liquid leak-tight seal around the stem. .

Although the valve stem can be actuated by a variety of manual, mechanical, and automatic actuators, a handle member 54 is shown in the illustrated example. The handle is removably secured to the stem member 30 with a nut 56. The handle 56 is attached to the top of the nut 52. Community flat 58Il'
i, effectively formed on the outside of the stem and cooperating with a flat (not shown) in the nodule opening to properly position the nodule on the stem. However, the position of the needle and the position of the pressure member C 11Fi%I.Ndle 54
is limited by dependent stop members 62,64 attached to the. These stops engage appropriate surfaces on the valve body midsection 12 to provide fixed stops for the valve in the fully open and fully closed positions.

Furthermore, in Figure KJ1, the structure of the ball valve seat used in the present invention includes a pair of valve seat rings arranged on both sides of the top member C. As shown, the valve seat ring assemblies are located on opposite sides of the passageway 20 in the center of the valve body, on opposite sides of the I/C adjacent balls, and are held by clamps. The valve seat ring assembly is attached to opposite sides of the rotation axis of the top member.

are located equidistant in y and have a central opening 66.68.

There are many other means of holding the valve seat ring assembly in place, each of which includes an end fitting 14.
It is held in position by the scrap 70.72 defined by the end faces 74.76 of 16. The internal movement of the seat ring assembly is limited by a pair of shoulders or steps 78,80. Shoulders 78,80 are formed from the interior end wall of the counter extending into the passageway 20 of the valve body.

Furthermore, one valve body central part 12 and end fittings 14.16
The space between them is sealed by sealing rings 82 and 84. The sealing rings 82.84 are each housed in a second counter 86.88. Each sealing ring is disposed around the circumference of a portion of the associated valve seating assembly. The sealing ring is preferably made of a deformable, elastic, heat resistant, thermally stable metal material such as a foamed carbonaceous material and a wire mesh composite material, and a conventional thermoplastic O-ring seal. This avoids the problems of sublimation and carbonization that tend to occur when exposed to high temperatures such as fire. A preferred structure is Grahoy A/ (Union Cor
(registered trademark of blde Corporation) is suitable for use as a deformable heat-resistant material.

Other materials such as asbestos or ceramic materials may also be used. Valve body central portion 12 and opposing end fittings 14.
16 is heated and cooled during and after the fire,
Expand and contract. The sealing rings 82,84 continue to provide a good seal during this time and between the valve body center and the end fittings.

Now, referring to the preferred valve structure so far,
Although structural details have been described, it will be readily understood that these may be modified to suit particular needs.

Such changes are not considered to affect the general spirit or scope of the invention as described below.

Referring to FIGS. 2 to 6 and 15 below, a valve seat assembly B constructed according to a preferred embodiment of the present invention will be described.
Explain the details. FIG. 2 is a cross-sectional view of the downstream valve seat assembly located adjacent end fitting 14 prior to valve assembly. The top member C has been omitted to illustrate the structure of the valve seat assembly in an easy-to-understand manner. 5 is a view showing the valve seat assembly of FIG. 2 installed on a valve, with the valve in a closed position and under the influence of high fluid system pressure; FIG. Figures 4, 5, and 6 show valve seat assembly B when the t-valve is placed under fire.
It is a diagram showing the situation step by step.

FIG. 4 shows the soft plastic valve seat ring melted and projected through the valve O. FIG. 5 shows the valve after the ball has contacted the secondary valve seat. FIG. 6 shows a soft plastic valve seat ring that has been completely ruptured and either completely ejected from the valve body or evaporated. FIG. 13 shows only one side of the valve exposed to fire or radiant heat, with valve seat assembly B partially destroyed. Lines 3-3.4-4.5-5 in Figure 15 correspond to the cross-sectional views of valve seat assembly B shown in Figures 3, 4, 5, and 6, respectively. do.

In particular, in FIGS. 2 and 5, valve seat assembly 8Ifi.

Preferably 6 parts, namely reinforcing or supporting ring 1
00, a primary valve seat member consisting of a valve seat ring made of soft plastic, and a secondary valve seat member 104 consisting of a deformable, non-thermodynamic valve seat ring. Although only a portion of one of the valve seat assemblies is shown in FIGS. 2 and 6, it is understood that the other valve seat assembly has the same structure unless otherwise noted. It will be. The reinforcement ring 100 has an annular shape including an opening in the center.

Constructed of hard material such as steel or other suitable metal. A circumferentially continuous first or end surface 106 of the ring 100 is connected to a corresponding shoulder 70 of the end fitting 14.
facing. The second continuous surface 108 is such that the counter of the passage 20 in the center of the valve body faces the end wall or step 78 of the valve body.
Establish the forward limit or home position of the reinforcing ring. The third continuous surface 110 usually faces the top member, but in order to avoid contact or interference with the top member, the third continuous surface 110 is located between the third continuous surface 110 of the reinforcing ring and the top member, and is partially located on the valve seat ring. 1
In order to prevent 02 from being distorted or displaced, it is constructed with dimensions that maintain a distance between it and the top member. ring 10
The outer periphery or peripheral surface 112 of 0 is disposed in close proximity to the side wall of 1 passageway 20 .

The outer surface 112 and the third continuous surface 108 are provided with flanges or steps shaped and dimensioned to engage the shoulder 78, depending on the dimensional requirements of the valve, to allow the support ring 100 to partially pass through the passageway 20.
It is also possible to have an axial extension inside the. However, in order to avoid an increase in the number of machining steps, this type of additional flan V is omitted in the embodiment shown in FIG.

Furthermore, in FIGS. 2 and 3, the erectile seat member 102 is also constituted by an annular, ie, ring-like member having an opening in the center. This opening is smaller in size than the central opening of the reinforcing ring 100.

- the absent seat member preferably consists of a valve seat ring made of soft plastic, towards the reinforcing ring 100 and
It is arranged so as to bend in the direction away from the reinforcing ring 100. The valve seat ring 102 is arranged so as to apply mechanical elasticity similar to a streak ring to the top member. The first surface 120 is normal.

Facing the corresponding shoulder 70 of the end fitting 14.

The second face 122 of the seat ring faces and supports the reinforcing ring 100 in supporting engagement and supports the first face 106 of the reinforcing ring. - The third surface of the valve seat ring, ie, the engagement surface 124 with the ball, normally faces the top member C and is sealingly engaged with the top member C. A flange or lip 126 extends axially outwardly of the first face 120 of the seat ring at the outer circumferential surface 12 J31C. The ring 126 is.

Preferably, it is continuous around the valve seat ring and positioned such that the radial inner surface of the lip is generally flush with the outer diameter of the second valve seat member 104. The flange or lip 126 further includes:
The outer end portion in the radial direction is chamfered, and is configured to slightly overlie the outer end portion in the radial direction of the second valve seat member, as shown in the figure.

This arrangement has the advantage, although not necessarily essential, that - the gap seat member and the secondary valve seat member can be maintained together as one subassembly. Preferably, the valve seat ring 101
; Constructed of elastic soft plastic materials such as Teflon, I-lyethylene, etc.

However, the constituent material of the ring 102 may be other types of materials other than the above, such as acetal resin, and further,
Soft metal or ceramic materials can also be used. Therefore, the material is selected also taking into account the normal operating conditions of the valve.

The partial valve seat ring 102 has a weir ring 130.

Preferably, the ring 120 is housed within an annular undercut or groove 132 in the valve seat ring 102 and isolated from the valve fluid flow passageway 2o. However, within the scope of the present invention, it is also possible that the weir ring 130 is completely housed within the valve seat ring 102.
It is also possible to have a structure in which the valve seat ring 102 completely extends outside the valve seat ring 102. If the weir ring is disposed completely outside the valve seat ring 102, for example, the axially facing lip of the secondary valve seat member 104 can be arranged such that - the inner diameter of the rest seat ring 102 extends toward the top member; It can be configured into a structure. Preferably, the weir ring 130 is attached to the corresponding secondary valve seat member 1
The valve seat ring 102 between the valve seat ring 04 and the top member C is arranged radially at the center of Y. When placed in this position, the weir ring 130 is free from wear and tear, and therefore does not have any negative impact on the soft-slip member during normal operation. The weir ring is constructed of a thermally stable, non-thermofluidic material. Preferably, like the sealing rings 82, 84, they are constructed of graphoil and wire mesh material.

It may be constructed of graphoil only or wire mesh, or ceramic or metal may also be used.

The secondary valve seat member 104 is comprised of a subassembly having a right conical disc spring 134 in the center. The disc spring 134 is sandwiched between a first annular outboard 136 facing the respective shoulder 70 and a second annular outboard 138 facing the kneeling seat assembly 102 . Front sheet 136.
138ii: it1, preferably composed of graphoil
Normally, it is provided in the same range as the disc spring 134, but within the scope of the present invention, the front seat (136°13)
It is also possible to provide 8 only on a part of the disc spring. In this case, for example, the first sheet 136 may be spread over only a portion near the outer diameter of the disc spring 134,
The second front sheet 138 is expanded only to a portion near the inner diameter of the disc spring 1340. This embodiment is particularly economically advantageous for large ceilings.

It is also very effective to carve C-lets or grooves on the surface 74 of the support shoulder 70 to improve grip of the front sheet 136 of the disc spring. This improved gripping surface prevents the top sheet and disc spring from slipping, flowing out, and protruding in the event of a fire. Grafoil can become somewhat fluidized at high temperatures. The knurled and grooved surface suppresses fluidization,
Improves the sealing effect to prevent liquid leakage.

The diameter of the outer end of the secondary seat member 104 is the same as the inner wall of the axial flange 126 of the seat ring and the first surface 1 of the seat ring.
The diameter of the central opening 118 is set to be slightly larger than the diameter of the central opening 118 with a dimension 102 that allows the member 104 to be accommodated in the cylindrical capity defined by the upper member 20, so that during normal operation, the secondary valve seat member is The structure has virtually no contact with the system to prevent wear and damage caused by contact.

The disc spring 134 is selected to have sufficient spring force to press the valve seat ring 102 against the upper member even when partially bent. Under normal operating conditions, the spring must be able to flex and flatten to aid in ball movement and engagement with the third surface 124 of the valve seat ring. In FIG. 3, the gap seat ring 102 is sealed between the upper member C1 support ring 100, the valve body 12, and the end fitting shoulder 70 to provide a leakage seal. Under normal operating conditions, the secondary valve seat member 104 serves primarily to bias the seat ring 10;
2, and no secondary sealing function is performed.

1, 2, and 5, when assembling the valve,
Each valve seat assembly B i, t, valve seat ring mating surface 1 with ball
24 and the upper member C, in response to this, each vacancy ring 102 moves away from the other ring,
The secondary valve seat member 104 is normally moved to a position where it is slightly rotated and bent around its outer periphery so as to lean against it.

Due to this operation, the corresponding disc spring 134
Slightly compressed and flattened. The deflection of the springs, along with the positioning of the top member, ensures a sealing force between the two valve seat rings and the ball at the ball engagement surfaces 124 even at low system pressures. A second exhaust orifice or opening 17 in ball C is provided so as to face the inlet pressure of the valve when the valve is in the closed position, preventing the inlet valve seat from sealing. Even if the liquid in the center of the valve expands due to heating or vaporization, it is released through the exhaust orifice 17.
The internal pressure of the valve will not increase.

Now, with reference to Figures 4, 5, 6, 12, and 16, below, we will explain the operation of the above-mentioned preferred example of a real plant when the plant is destroyed by a fire. explain.

FIG. 4 shows the soft plastic valve seat ring 102 being heated to become more fluid and then flowing or protruding from the central opening 66 of the secondary valve seat member 104 due to the hydraulic pressure inside the valve. show. As the valve seat ring 102 softens, the disc spring 134 of the secondary valve seat member 104 deflects to maintain a fluid seal with the upper member C and the end surface 74 of the scrap 70.

In FIG. 5, the upper member C has moved axially downstream into the valve, compressing the secondary valve seat @ 104 and contacting the weir ring 130. In FIG. Disc spring 134 and valve seat ring 1
The second top sheet 138 sandwiched between the top and bottom sheets 138 comes into contact with the top member CK at the innermost position in the radial direction to perform a liquid sealing function. The second top sheet 138 is preferably made of a heat-resistant deformable material such as Grafoil, so that the sheet deforms to fit the shape of the engagement surface of the upper member C and performs a sealing function. However, it overcomes the problems of conventional fire ceilings that incorporate metal-to-metal secondary seals.
I++aw+y--1 Thn1Fef
fJJ~ + fi + -I 6 units
The MW sheet 136 also has a radially outer end and a shoulder end wall 7.
At 4, the support shoulder 70 is engaged to provide a liquid seal.

The deformable nature of the sheet 136 allows it to better conform to and seal the irregular shapes of the surface 74 and the radially outer end of the disc spring 1340.

Since the disk gel ring 134 is elastic in the circumferential direction, it is also possible to form a complete metal-to-metal sealing structure with the top member C. According to this structure, it is possible to overcome various problems resulting from the fact that the top member cannot be made into a perfect sphere and that the top member and the secondary valve seat member cannot be overlapped in a fitting manner.

Therefore, it is possible within the scope of the present invention for the secondary valve seat member 104 to be constructed without the first and second front sheets 136,138.

The disk spring 134 of the secondary valve seat member has elasticity in the axial direction as well as elasticity in the circumferential direction, so the valve seat ring 1
02 softens, the secondary valve seat member deforms and the top member C
and the end surface 74 of the shoulder 70. By circumferential elasticity is meant the ability of the secondary valve seat member to deform axially by an order of magnitude more than the other cementaments.

The top member C is not a perfect sphere, but a disc spring 1
The 34 central openings 66 are also not perfectly circular, so the balls and springs only make contact at a few high points. Since the disc sedge ring 134 is elastic in the circumferential direction, the spring 134 deforms at the high point, bringing the ball and the radially inner end of the disc spring 134 into close contact as if in continuous contact. Similarly, the outer end of the disc spring 1340 in the radial direction only contacts the end face 74 at a few high points, but since the disc spring 134 elastically tears in the circumferential direction, the sedge ring 134
deforms a variable amount about its circumference, thus forming a substantially continuous line of contact between the radially outer end of the disc spring 134 and the end surface 74 of the shoulder 70. Therefore, the elasticity of the disc spring 1340 in the circumferential direction is determined by the circular imperfections at the inner and outer ends of the disc spring 134, the spherical imperfections of the top member C, and the end surface 7 of the shoulder 70.
Correct the flatness imperfection of 4.

The A-ring 130 serves as a "girth" or dam to prevent the plastic valve seat 102 between the top member C and the secondary valve seat member 104 from softening and protruding excessively toward the valve opening. . In reality, a fire does not evenly heat the entire surface of a fire valve. In particular, if a fire breaks out near the valve, there may be a case where only one side of the valve gets heated and the other side is completely destroyed. Therefore, during a fire, the plastic valve seat ring 102 can be removed before other parts soften.
It is also quite conceivable that only the first portion around the zero circle is softened. In the absence of the weir ring 130, the first portion would protrude excessively from the valve opening under the pressure of the system, displacing the top member C axially and laterally perpendicular to the passageway leading to the valve opening. let

As a result, the top member C moves downstream through the softened plastic and comes into contact with the secondary valve seat member, so the ball is too far away from one side and the contact with the secondary valve seat member 104 is uneven. , creating large gaps and leak paths through which melted plastic and liquids within the system can escape. It has been observed that leakage paths and gaps of this type typically occur at 90 degrees from the radial shaft vector direction. A point 180 degrees with the radial shaft vector maintains a liquid seal through contact with the remaining partially plastic valve seat 102.

When the system liquid is sprayed, the plastic valve seat 102
When a large leak like this occurs, it will continue to leak no matter how much the fire valve is subsequently heated by the fire.

FIG. 12 shows an additional mechanism for partial failure of the valve seat. The valve seat assembly shown in this figure does not have a weir ring. When the valve seat assembly is exposed to fire, only portion 141 protrudes into the valve port. As a result, since the top member cannot come into contact with the secondary valve seat member 104, a large leakage path 143 is formed. - The remaining part of the next plastic valve seat ring 102 prevents the top member C from moving radially or axially into the protruding part. The leaked liquid cools the Zolastic valve seat ring and prevents it from further breaking or ejecting, regardless of the severity of the fire.

Fi, in FIG. 5 - Wherever softening of the plastic ring occurs around the valve seat, the dam ring 130 dams the flow of softening and molten plastic. Cough ring 13
0 is located in the middle of the valve seat ring 102 so that only the narrow annular portion 144 protrudes into the valve port. valve seat ring j02
The main portion 146 is isolated from the projecting flow of plastic by the weir ring 130. The relatively small portion 144 that can be protruded becomes almost dry due to the protrusion, into which the earth material then enters, so that no leakage path is formed. Sewer ring 130 and valve seat ring 1
02, the soil member C may be arranged so as to be in contact with the secondary valve seat member 104 and at the same time in full contact with the weir ring 130. According to this structure, the weir ring 13 (It, -
It also serves as a secondary seal after the vacated seat member 102 is destroyed.

In FIG. 6, - the defective seat member 102 has been completely destroyed to the extent that the soft-silastic valve seat ring has completely sublimated or evaporated from the valve opening. However, since the soil member C maintains contact with the radially inner end of the second front sheet 1380 (this portion deforms according to the surface of the soil member), there is a gap between the soil member C and the secondary valve seat member 104. A liquid seal is maintained.

(Table 1) 136 similarly engages with the shoulder end wall 74,
A fluid seal is maintained between the secondary valve seat member 104 and the shoulder 70. Furthermore, the dimensions of the weir ring 1300 are determined as follows: - When the gaping seat member is destroyed and the ball moves downstream along with this,
If the dimensions are such that it can engage with the soil member, there are great advantages. The engagement further increases the sealing points of the liquid seal.

At line 6-6 in Fig. 1!1, - after the defective seat member is destroyed, the ball contacts the weir ring 130 and also contacts the secondary valve seat member to maintain a liquid seal (see Fig. 6). I can see that there is. In line 5-5, - the main part of the diaphragm member is the weir ring 1;
30 prevents protrusion, thereby avoiding the formation of leakage paths as shown in FIG.

Another embodiment of the invention is shown in FIG.

In this figure, to aid understanding and evaluation of this embodiment, components similar to those in the previous embodiment are indicated by the same reference numerals with a suffix ('), and new components are indicated by new reference numerals. That's it. The secondary valve seat member 104' is comprised of a single disc member 150 of a heat resistant deformable material such as Grafoil or Grafoil and wire mesh material. When the primary valve seat member 102I is destroyed by fire, the earth member C moves downstream under hydraulic pressure and engages with the radially inner end of the secondary valve seat member 1041 to form a liquid seal. . Additionally, preferably 4, the knurled wall 74' engages the end surface 152 of the secondary valve seat member to connect the secondary valve seat member to the support shoulder 70'.
forming a liquid seal between them. Secondary valve seat member 104'Fi,
Ball C' thus engages the surface of wall 74'.

FIG. 9 shows yet another embodiment of the invention.

In the figure as well, the same components as before are indicated by the same reference numerals with the suffix K(#)t.

134'' and a heat-resistant deformable material such as Grafoil or Grafoil and Wire Mesh material. If the primary valve seat member 102'' is destroyed in a fire, the primary valve seat member in the closed position will be exposed to system pressure. It advances toward the secondary valve seat member 104'' and twists the radially inner end of the front sheet 156 into contact to form a liquid seal. Additionally, as the fire intensifies, the disc spring 134'' is annealed and softened. The loaded disc spring is deflected by the soil member under pressure and thus more easily displaces the surface 74 of the support shoulder 70''.
'' to form a good metal-to-metal seal behind the spring.

Still other embodiments similar to this embodiment are constructed using a single top sheet on the side of the disc sedge ring facing the support shoulder. This construction creates a metal-to-metal secondary seal from the ball and topsheet to the shoulder. The shoulders are preferably knurled to ensure contact with the top sheet.

FIG. 10 shows still another elliptical example of the present invention with the same reference numerals as O, with ('ll) added to the end. In this actual example IIi, the support ring 100''', the missing seat member portion, the valve seat ring 102M, and the disc spring 1'3.
4/I/ and a secondary valve seat member 104# having a first front sheet 1a5/// and a second front seat 138''.A front sheet 136#, 138
” is constructed of graphoil or other heat-resistant deformable material. Does not include weir ring. Valve seat ring l 0 in case of fire.
2/// is destroyed, the upper member moves axially downstream and comes into contact with the second front sheet 138'' to form a liquid seal. It engages the pierced end wall 7allL to maintain a seal.

Finally, FIG. 11 will be explained. FIG. 11 shows still another embodiment of the present invention, in which the same components as before are indicated by the same reference numerals with (1111) added to the end. The second valve seat member 1041 #1 is a single disc spring, a single non-thermal fluid deformable disc made of graphoil or a mesh composite material of graphoil and metal wire, or a thick material. Secondary valve seat member 10 shown
The weir ring 130"" can be constructed of any of the same combinations of disc springs and Grafoil topsheets as 4". The weir ring 130"" is preferably constructed of a Grafoil and wire mesh composite material; Or contact the upper member when completely destroyed, the valve seat ring to 2TI
It is disposed within the primary valve seat member 102'' to prevent protrusion of the main portion 146'' of the rJ.

In addition, although not shown in the drawings, many changes can be easily made during the valve seat ring assembly period without departing from the spirit of the present invention. For example: - a vacancy member, a reinforcing ring,
The relative dimensional characteristics between the secondary valve seat members and the secondary valve seat members are desirably adjusted according to specific operational requirements.

Now that we have described the preferred embodiments of the present invention, and.

Although the invention has been described with reference to several alternative embodiments, it will be obvious that the invention is susceptible to various other changes and modifications. All such changes and modifications are intended to be included in the present invention insofar as they come within the scope of the appended patents.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a ceiling incorporating a preferred embodiment of the present invention. 2 is an enlarged cross-sectional view of a portion of the valve seat assembly downstream of FIG. 1; FIG. The valve is shown just before being assembled, and the upper member has been removed to simplify the drawing. FIG. 6 is also an enlarged cross-sectional view of a portion of the valve seat assembly downstream of FIG. The valve is shown in the closed position tK under the influence of the pressure increase in the liquid system. FIG. 4 is a sectional view similar to FIG. 5. The soft plastic valve seat ring is shown beginning to flow out through the valve opening due to the high heat caused by the fire. FIG. 5 is a cross-sectional view similar to FIG. 4, showing the ball contacting the secondary valve seat. FIG. 6 is a cross-sectional view similar to FIGS. 4 and 5, showing the soft plastic valve seat completely destroyed. FIG. 7 is a substantially plan view taken along line 7--7 of FIG. A partial cutaway view of the valve body shows an improved bolt arrangement. FIG. 8 Ifi is an enlarged cross-sectional view of a valve seat assembly incorporating another embodiment of the present invention. FIG. 9 is an enlarged sectional view of still another embodiment of the present invention. FIG. 10 is an enlarged cross-sectional view of a ceiling valve seat assembly incorporating yet another embodiment of the present invention. FIG. 11 is an enlarged cross-sectional view of yet another valve seat assembly incorporating the present invention. FIG. 12 is an enlarged perspective view showing the valve seat assembly of FIG. 10 partially destroyed by fire. To simplify the drawing, the part removed from the valve body is shown. FIG. 13 is an enlarged perspective view showing the valve seat assembly of FIG. 1 partially destroyed by fire. For simplification of drawings, the parts removed from the valve body are shown by reference numerals 8...Ceiling% B...Valve seat assembly, C...Upper member, 10...Valve body% 14.16. ... End fitting, 15° 17 ... Opening of upper member, 20 ... Opening of valve body, 22 ... Tie bolt % 70 ... Scrap, 1
00... Reinforcement ring, 102... - Hidden seat member, 1
04...Secondary valve seat member. FIG, 2 FIG, :3FIG
, 4 FIG, 5 FIG, 7 FIG, 6 FIG, 8 FIG, 9 FIG, 10 FIG, II FIG, 12 FIG, 13

Claims (1)

Claims: (1) a valve body having a central passageway and a liquid flow opening therethrough located within the passageway for selectively rotating the valve between open and closed positions; three members for controlling liquid flow through the valve; a pair of radially inwardly extending scraps disposed in the passageway in a circumferential direction of the passageway and sandwiching the three members; a pair of radially inwardly extending counterpores disposed across the three members, each having an inner end wall; and a pair of composite valve seat assemblies provided for liquid-tight engagement, each of the pair of valve seat assemblies having (2) a central opening, and a reinforcing ring adjacent to the associated one of the inner end walls of the reinforcing ring; a central opening adjacent to the reinforcing ring and generally arranged to be elastically deflectable in a direction toward and away from the reinforcing ring; a valve seat ring having a retaining surface with a ball facing the three members for sealing and retaining the pressure member, and a central opening, which normally forms a right conical shape when not under stress. a disc spring inserted between said valve seat ring and an associated one of said layers, further comprising at least one annular sheet comprised of a foamed carbonaceous material and disposed on one side of said disc spring. The dimensions of the three members and the pair of composite valve seat members are such that when the valve is exposed to high heat and the valve seat ring is damaged, the secondary valve seat member is A fireball valve characterized in that the valve is configured to be pushed toward the three members to perform a sealing engagement.) In the valve according to claim 1, the three members and a pair of valve seats The dimensions of the assemblies are such that, during assembly, the seat ring and secondary valve seat member of each assembly flex to urge the seat ring toward the upper member into sealing engagement with the supranuclear member. A valve characterized by having the following dimensions. (3) In the valve according to claim 2, at least one sheet is disposed on both sides of the disc spring and extends over the same range as the disc spring in the radial direction. 0 and 0
9 valve. (4) The valve of claim 3, wherein the first sheet of foamed carbonaceous material is disposed adjacent to an associated one of the shoulders, and the second sheet is located adjacent to the valve seat. A valve featuring a seven when placed adjacent to the ring. (5) In the valve according to claim 4, when the valve seat ring is damaged due to exposure to high heat, the second sheet comes into contact with the upper member to maintain a seal. Valve. +6J In the valve according to claim 5, the -6J
A valve characterized in that the sheet is in contact with an associated one of said layers to provide a liquid-tight seal. (7) The valve according to claim 1, wherein the pair of radially inwardly extending shoulders has a knurled surface that engages with the secondary valve seat member. Valve. (The valve of claim 1 of the '83 patent, wherein the pair of radially inwardly extending shoulders are secured to the valve body by a plurality of fastener members contained within the valve body.) (9) In the valve according to claim 1, the upper member further includes the valve body which is caused by the liquid being heated and vaporized when the valve is exposed to high heat. 01 % Permissible Required Range The valve according to item 9, wherein the releasing means is disposed directly in front of the liquid flow opening. The valve is specially designed to be arranged so as to face the liquid inlet opening of the valve when the valve is in the closed position, and to be composed of nine exhaust orifices. , further comprising a weir ring in at least one of the pair of composite valve seat assemblies to prevent the valve seat ring from protruding when the valve is exposed to high heat. Valve. In the valve according to claim 11, in order to prevent the sliding ring from being worn out during normal operation of the valve, the sliding ring is installed in one of the valve seat assemblies. 13. A valve according to claim 12, characterized in that the weir ring is located substantially apart from the central opening of the associated valve seat ring. In the valve according to claim 1, the at least one annular sheet of foamed carbonaceous material is accommodated in the valve according to the normal operation of the valve. the valve is located in at least one of the valve seat assemblies at a location substantially spaced from the central opening of the associated valve seat ring to prevent wear. θli The valve according to claim 14, characterized in that the at least one annular sheet made of a foamed carbonaceous material is inserted between the valve seating and the disc spring. A valve according to claim 14, wherein the at least one annular sheet of foamed carbonaceous material is connected to the disk spring and the pair of radially inwardly extending shoulders. (1η) A valve body having a central passageway, a liquid flow opening passing through the body, and a valve body located within the passageway for opening and closing the valve. an upper member that selectively rotates between positions to control liquid flow through the valve; and a pair of radially inwardly extending members disposed circumferentially of the passageway, sandwiching the upper member within the passageway. a deformable heat resistant secondary valve seat in which a valve seat member is inserted between the upper member and the resilient valve seat ring and an associated one of the pair of shoulders; a resilient valve seat in the passage for liquid-tight engagement with the ring, the secondary valve seat being substantially isolated from contact with liquid in the upper member and stem during normal operation; However, if the resilient valve seat ring fails due to exposure to high heat, the secondary valve seat ring engages the pressure member to seal the valve. 0Fj The improvement according to claim 17, wherein the secondary valve seat ring is made of a foamed carbonaceous material. In the improvement described in claim @17, the valve seat member is configured to push the elastic valve seat ring toward the three members and engage the secondary valve seat ring. , further comprising a disc spring inserted between the core secondary seat ring and an associated one of the pair of shoulders. (c) In the improvement described in claim 19, the improvement is characterized in that the disk spring and the secondary valve seat ring are generally provided over the same range in the radial direction. (21) In the improvement described in claim 17,
An improvement characterized in that the layer is secured to the valve body with a biconical fastener member housed within the valve body. (b) In the improvement described in claim 17, the one of the pair of shoulders has a knurled surface for engaging with the secondary valve seat ring. Improvement. (b) a valve body having a generally cylindrical liquid flow passageway and disposed within the passageway for selectively rotating the valve between open and closed positions;
at least three members disposed to be movable in the axial direction within the passageway when the valve is in the closed position while receiving hydraulic pressure; and a supranuclear member sandwiched within the passageway. and a pair of annular valve seat rings disposed between a pair of shoulders of the valve body. and to prevent the valve seat ring from protruding when the valve is exposed to high heat. c!滲 In the improvement described in Patent Application Scope No. 23, the improvement is characterized in that the weir ring is normally disposed at the center in the radial direction of the valve seat ring. (c) In the improvement described in Patent kh scope of claim 24, the improvement is characterized in that the weir ring is accommodated in an annular groove provided in the valve seat ring. 1/! e In the improvement described in claim 25, the weir-shaped groove is arranged in the valve seat ring at a position separated from the liquid flow passage, and the weir ring '4': ?To prevent damage to the normal operation of the
Improvement with Gυ characteristics. C2n lP: r Scope of Permission Request In the improvement described in item 25, the improvement is characterized in that the cough ring is accommodated in the ring in the dumben J. (In the valve according to claim 23 in which layer 4 is allowed, the L
34 valves are inserted between each valve seat ring and its associated shoulder and include a pair of annular disc stubs for sequentially urging the valve seat ring toward the pressure member into sealing engagement. A valve further comprising a ring, and a nine-shaped disc spring that is combined with at least one of the valve seat rings has an annular surface sheet made of a heat-resistant material. 1'! ! e n4. In the improvement set forth in Claim 28, the improvement is characterized in that the decorative ring usually includes the valve seat ring and the valve seat ring. A patented surface sheet characterized in that the heat resistant material is a foamed carbonaceous material is delivered to each facing surface of the disc spring. 8. A valve characterized in that the valve is provided over the same range in the radial direction as the disc spring. In the feature set forth in claim 28, the annular surface sheet is disposed on each facing portion of the disc spring.
F! a first surface sheet extending over a portion of the first surface of the disk spring in the vicinity of the outer diameter of the spring facing the associated nozzle; and an inner diameter of the spring facing the three members; The second surface 9 of the disc spring at
A valve comprising a partially extending second surface sheet. In the improvement described in claim 23, a pair of rings 4 extending toward the pressure member on one of the continuous inner diameters is provided.
An improvement characterized in that it consists of an axially directed lip provided on one side of the inlet disc spring. C (The improvement described in Claim 23 of the '41 patent, characterized in that the weir ring is constructed with dimensions such that it comes into contact with the pressure member when the flywheel valve seat ring is broken.1. 151 Claim j: In the improvement described in paragraph A34, the weir ring further contacts the associated one of the pair of shoulders of the valve body and engages the pressure member when the valve seat ring is destroyed due to high heat. An improvement characterized in that the valve body is dimensioned to form a liquid seal between the associated one shoulder. A pressure member located in the passage and selectively rotated when the valve is opened and closed to control the liquid flow flowing through the valve; In an upper extension having a pair of radially inwardly extending lips disposed in the circumferential direction of the passageway, the next valve seat member is connected to the valve seat member and the pressure member or system during normal operation. To avoid contact with liquids -
a flexible valve seat ring is included in the passage for fluid-tight engagement with a deformable, heat-resistant secondary valve seat that is separately housed within the secondary valve seat member; An improvement comprising: when the flexible valve seat ring is damaged due to high heat, the secondary valve seat member engages the ball ring to seal the vent valve. C37) In the improvement of claim 66 l1hk,
The secondary valve seat member is disposed at a radially central portion of the secondary valve seat member such that the flexible valve seat ring follows the central passageway and protrudes when the vent valve is exposed to high heat. An improvement characterized in that 411 is made to such a size as to prevent.