NZ752048A - Valve with integral insert-cast seat and related method - Google Patents
Valve with integral insert-cast seat and related methodInfo
- Publication number
- NZ752048A NZ752048A NZ752048A NZ75204818A NZ752048A NZ 752048 A NZ752048 A NZ 752048A NZ 752048 A NZ752048 A NZ 752048A NZ 75204818 A NZ75204818 A NZ 75204818A NZ 752048 A NZ752048 A NZ 752048A
- Authority
- NZ
- New Zealand
- Prior art keywords
- valve
- seat
- valve body
- valve seat
- water
- Prior art date
Links
- 239000002184 metal Substances 0.000 claims abstract description 50
- 229910052751 metal Inorganic materials 0.000 claims abstract description 50
- 239000000463 material Substances 0.000 claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 230000000694 effects Effects 0.000 claims abstract description 17
- 238000000465 moulding Methods 0.000 claims abstract description 8
- 210000000088 Lip Anatomy 0.000 claims description 21
- 238000007789 sealing Methods 0.000 claims description 21
- 239000012530 fluid Substances 0.000 claims description 16
- 238000005260 corrosion Methods 0.000 claims description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims description 7
- 239000010935 stainless steel Substances 0.000 claims description 7
- 229910001018 Cast iron Inorganic materials 0.000 claims description 5
- 229910001141 Ductile iron Inorganic materials 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 230000037361 pathway Effects 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000005266 casting Methods 0.000 description 9
- 150000002739 metals Chemical class 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 206010053648 Vascular occlusion Diseases 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000789 fastener Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 238000005296 abrasive Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive Effects 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral Effects 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
Abstract
A valve device includes a metal valve body defining a water passageway between an inlet and an outlet of the body. A valve seat of a different material than the valve body is insert-cast molded integral with the valve body. The configuration of the valve seat and the mass of the valve body surrounding the seat being sufficiently large reduces a chilling effect during molding such that a pressure-tight and waterproof interface is formed between adjacent surfaces of the valve body and the valve seat. ding the seat being sufficiently large reduces a chilling effect during molding such that a pressure-tight and waterproof interface is formed between adjacent surfaces of the valve body and the valve seat.
Description
VALVE WITH INTEGRAL INSERT-CAST SEAT AND RELATED METHOD
DESCRIPTION
BACKGROUND OF THE INVENTION
[Para 1] The present invention generally relates to valve devices. More
particularly, the present invention relates to a valve device having a valve seat of
dissimilar material sealingly molded within a valve body so as to provide a
leakproof and pressure-tight union between the valve seat and valve body.
[Para 2] Valves are devices that regulate, direct or control the flow of a fluid by
opening, closing or partially obstructing various passageways. The valve is
typically a mechanism that opens and closes to control the flow of fluids
therethrough. One such example is of valves used in waterworks or water utility
systems. The valves, such as control valves, are used to start and stop flow,
regulate pressure and throttle flow, prevent back flow and relieve pressure.
[Para 3] Many valves utilize an inserted valve seat which is engageable with a
movable valve member to close off or prevent the flow of fluid therethrough. It
is desirable, and sometimes necessary, that a leakproof and pressure-tight
arrangement be formed between the valve seat and the valve body into which
the seat is installed so that the fluid does not flow therethrough. In some cases,
it is desirable that the seat be of a different material than the surrounding valve
body. For example, valve seats of waterworks valves are typically not the same
11206832_1 (GHMatters) P110948.NZ
material as the valve bodies. The seat is comprised of a material that has better
corrosion properties to prevent corrosion or sealing surface decay when used.
For example, stainless steel may be utilized as the valve seat material which is
less likely to erode prematurely from the water properties and chemicals,
including chlorine, chemical additives, etc. or erode due to flow conditions and
suspended particles in the water, such as sand, silt, and the like which can act
as an abrasive substance especially when flowing at high velocities across the
seat surface. On the other hand, the body of the valve is often comprised of a
different type of material, such as cast iron, ductile iron or steel. These
materials are more readily formed into the larger valve body and less expensive.
[Para 4] Currently, there are several steps required in order to attach a valve
seat of one metal or material to a valve body of another material or metal. The
valve seat is usually created separately. The valve body is molded or otherwise
formed with an area, including recesses and depressions, configured to receive
the valve seat. After molding the valve body, these areas usually require
additional treatment and finishing in order to receive the valve seat therein and
have the valve seat attach thereto. Fasteners are required to attach the valve
seat to the valve body. Adhesives and/or sealing gaskets or other members
may also be required to form a leakproof and pressure-tight fit between the
valve seat and the valve body.
[Para 5] It would be desirable to cast the seat into the valve body so as to form
it integrally as the valve body is molded, in order to avoid the time, effort and
11206832_1 (GHMatters) P110948.NZ
expense associated with the aforementioned procedures and steps. However,
molding the valve body to a valve seat of dissimilar material will usually not
form a leakproof of pressure-tight connection therebetween. Instead, casting
anomalies, such as porosity, occlusions, gaps and the like are often formed at
the interface of the valve seat and valve body materials or within the valve body
material as it cools and hardens around the cast-in valve seat. This results from
a variety of factors, including a chilling effect formed at the interface of the
cooler valve seat and the molten metal forming the valve body. The molten
valve body material, as it cools and hardens, can pull away from the valve seat,
form occlusions, cracks, and the like. Thus, a leakproof and pressure-tight seal
is not formed between the valve body and the valve seat.
[Para 6] It would be desirable to have an integrally cast seat arrangement with
the valve body to eliminate the assembly steps and reduce the time and cost to
machine a finished part. It would be desirable to have a valve seat designed in a
manner so as to prevent casting anomalies when the seat is cast in the molded
valve body, so as to retain a leakproof and pressure-tight fit between the valve
seat and the valve body. The present invention fulfills these needs and provides
other related advantages.
SUMMARY OF THE INVENTION
[Para 7] The present invention is directed to a valve body having a valve seat of
dissimilar material sealingly molded therein. The valve body may be of a
11206832_1 (GHMatters) P110948.NZ
waterworks valve device and defining a water passageway between a water inlet
and a water outlet of the body. A valve seat is comprised of a material different
than the metal of the valve body and is insert-cast integral with the valve body.
A sealing valve member is generally aligned with the valve seat and movable
between an open position away from the valve seat to permit water to pass from
the inlet to the outlet of the valve body, in a closed position against the valve
seat to prevent water from passing from the inlet to the outlet of the body. A
diaphragm may be coupled to the sealing valve member to define a variable
control chamber with an air wall or cover of the valve body.
[Para 8] The valve seat is hollow, such as having a generally cylindrical
configuration. It may be comprised of a water corrosion-resistant material,
such as stainless steel. The valve seat has an upper lip configured to engage a
sealing valve member of the valve device. A bottom edge is spaced from the
upper lip at a lower portion of the seat. A projection extends away from an
outer surface of the seat intermediate the upper lip and bottom edge. The
projection may comprise a circular flange having a plurality of spaced apart
indentations along an outer perimeter thereof. The indentations of the flange
are preferably closely spaced apart from one another along the perimeter of the
flange. The perimeter of the flange may have a scalloped configuration. The
lower portion of the seat may be of a reduced thickness as compared to the
upper portion of the seat.
11206832_1 (GHMatters) P110948.NZ
[Para 9] The seat is placed in a mold and molten metal is poured into the mold
to form a valve body surrounding at least a portion of the seat, including the
projection, such that the upper lip of the seat is exposed. The metal of the
valve body is of a different material than the metal of the seat, and may
comprise cast iron, ductile iron or steel, for example. The valve body forms a
fluid flow pathway through an inlet of the valve body, through the seat into an
outlet of the valve body.
[Para 10] A volume of a mass of the valve body surrounding the valve seat is
at least twice a volume of at least an embedded portion of the seat so as to
minimize chill effects of the seat material while the molten metal of the valve
body cools and hardens, such that a pressure-tight and waterproof interface is
formed between adjacent surfaces of the valve body and the valve seat. A ratio
of an outer surface area of the valve seat compared to the volume of the valve
seat is also preferably sufficiently large to reduce the chilling effect of the valve
body as it cools and hardens while being molded to the seat.
[Para 11] Other features and advantages of the present invention will become
apparent from the following more detailed description, taken in conjunction
with the accompanying drawings, which illustrate, by way of example, the
principles of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
11206832_1 (GHMatters) P110948.NZ
[Para 12] The accompanying drawings illustrate the invention. In such
drawings:
[Para 13] FIGURE 1 is a top perspective view of a valve seat of the present
invention;
[Para 14] FIGURE 2 is a bottom perspective view of the valve seat;
[Para 15] FIGURE 3 is a side view of the valve seat, with dashed lines
representing the different thicknesses of the valve seat along a length thereof;
[Para 16] FIGURE is a top view of the valve seat;
[Para 17] FIGURE 5 is a bottom view of the valve seat;
[Para 18] FIGURE 6 is a diagrammatic view illustrating the valve seat of the
present invention placed within a mold and molten metal forming a body of the
valve poured within the mold to cast the valve seat therein, in accordance with
the present invention;
[Para 19] FIGURE 7 is a sectioned view of a valve body having the valve seat of
the present invention cast therein;
[Para 20] FIGURE 8 is a cross-sectional view of a waterworks control valve
having the valve seat integrally cast within the valve body, in accordance with
the present invention;
[Para 21] FIGURE 9 is an enlarged sectional view of area “9” of
illustrating the valve seat integrally and sealingly cast within the valve body; and
[Para 22] FIGURE 10 is an exploded perspective view of components of an
exemplary waterworks control valve incorporating the present invention.
11206832_1 (GHMatters) P110948.NZ
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[Para 23] As shown in the accompanying drawings, for purposes of
illustration, the present invention resides in a valve seat, and more particularly a
method for integrally casting the seat within a valve body of a dissimilar metal
such that a leakproof and pressure-tight arrangement between the valve seat
and valve body is achieved. Integrally casting the valve seat within the valve
body eliminates assembly steps and reduces the time and cost to machine and
assemble a finished part. Ordinarily, the valve seat would be a separate
component that is threaded, bolted, or otherwise fastened to the valve body. As
valve seats, at least in waterworks control valves, are typically not the same
material as the valve bodies, they haven’t been able to be integrally cast with a
valve body of a different metal in a leakproof and pressure-tight manner.
However, the valve seat of the present invention is configured such so as to be
integrally cast with the valve body and form a leakproof and pressure-tight
arrangement therebetween.
[Para 24] With reference to FIGS. 1-5, a valve seat 10 embodying the present
invention is shown. The valve seat 10 is hollow so as to permit water or other
fluid to pass therethrough. Typically, as illustrated, the valve seat 10 is
generally cylindrical in configuration. The valve seat 10 has an upper lip 12 at
an upper surface thereof which is configured to engage a sealing valve member
11206832_1 (GHMatters) P110948.NZ
of a valve into which the seat 10 is integrally formed. The valve seat 10 has a
bottom edge or lip 14 at a generally opposite end of the valve seat. A wall 16,
which is generally cylindrical in configuration, extends between the upper and
lower surfaces 12 and 14.
[Para 25] With continuing reference to FIGS. 1-3, a lower portion 18 of the
valve seat 10 is of reduced thickness or wall width compared to an upper
portion 20. This may be, as illustrated, by molding or machining the valve seat
such that the lower portion 18 is of reduced cross-sectional thickness so as
to form a ledge 22 along an inner circumference of the valve seat 10, as
particularly shown in In accordance with the present invention, to reduce
a casting chill effect or heat sink properties, the valve seat 10 is designed to
have a minimum amount of material thickness in areas where it contacts the
valve body material. Reducing the thickness of the lower portion 18 of the valve
seat 10 minimizes the amount of material thickness, causing it to have less
mass or volume. It also creates an enlarged surface area of the valve seat 10.
In accordance with the present invention, the ratio of the valve seat surface area
to the valve seat volume is sufficiently large to reduce the chilling effect of the
surrounding valve body metal as it cools and hardens.
[Para 26] The upper portion 20 of the valve seat 10, however, must be of a
sufficient thickness so that the upper lip 12 has a sufficient surface area so as
to present a sufficiently large area to provide a seal between the upper lip 12
and the sealing valve member of the valve. As is shown and explained herein,
11206832_1 (GHMatters) P110948.NZ
such as at least a portion of the upper portion 20 of the valve seat 10
extends out of the valve body and thus is not fully in contact with the body
material as it hardens and thus its chill effects have a lesser impact on the
cooling characteristics of the body metal.
[Para 27] As illustrated, in a particularly preferred embodiment, a projection
24, in the form of a peripheral, circular flange, extends away from an outer
surface of the wall 16, intermediate the upper lip 12 and lower lip 14. The
flange 24 includes a plurality of spaced apart indentations or notches 26.
Preferably, these indentations 26 are closely spaced apart from one another and
form substantially around the length or circumference of the flange 24, as
illustrated. The indentations 26 can be formed of notches, grooves or the like.
In a particularly preferred embodiment, as illustrated, the flange 24 has a
scalloped configuration due to the spaced apart indentations 26. The scalloped
flange detail on the valve seat 10 perimeter prevents rotational movement after
cast into the valve body. The scalloped or irregular surface detail of the flange
24 improves metal-to-metal bonding properties during the casting process and
prevents rotational movement of the valve seat 10 when it is machined in the
body.
[Para 28] The valve seat 10, when utilized in connection with waterworks
valves, is comprised of a relatively hard and water corrosion-resistant metal,
such as stainless steel. The valve seat 10 can be machined from wrought or
cast material. If seat castings are used, they can possibly be used in as-cast
11206832_1 (GHMatters) P110948.NZ
condition or machined for tighter tolerance fit in pattern tooling. While
stainless steel is a particularly preferred metal for use in waterworks valve
applications as it has anti-corrosion properties relating to the water and the
sand, silt and other materials which pass through the water, it will be
understood that the valve seat 10 could be comprised of other metals and
materials as well. However, the valve seat 10 will be comprised of a metal or
material which has higher temperature melt properties than the metal utilized in
forming the valve body. Typically, the valve seat 10 is comprised of a more
expensive metal than the valve body, as the valve seat must retain its surface
properties throughout the life of the valve and not corrode or erode away easily.
[Para 29] With reference now to a mold 2 is shown in which the valve
seat 10 is placed within a pattern core 4. The core assembly, which includes the
valve seat 10 is placed in a body pattern 6, and molten metal 8 which is to form
the valve body is poured into the pattern cavities of the mold 2, allowing the
molten metal 8 to fill the cavity voids around the valve seat 10. As mentioned
above, the valve seat 10 is comprised of a metal or material which is dissimilar
than the metal 8 poured into the mold 2 to form the valve body. For example,
the valve seat 10 may be comprised of stainless steel whereas the valve body is
comprised of ductile iron material, cast iron, steel, or the like. As the valve seat
is comprised of a metal having a higher temperature melt property than the
metal 8 forming the valve body, the valve seat 10 is allowed to remain intact
during the casting process.
11206832_1 (GHMatters) P110948.NZ
[Para 30] The surface areas 10 of the valve seat which will come into contact
with the molten metal 8 forming the valve body are preferably roughened, such
as by sandblasting or the like, to present a roughened surface which is more apt
to bond to the molten metal 8 forming the valve body. Moreover, as described
above, the scalloped flange 24 is of a thickness which is kept to a minimum and
includes the indentations, notches or grooves 26 referred to above so as to
reduce the chill effect of the casting of the dissimilar metals. Furthermore, as
mentioned above, the material thickness of the valve seat wall 16 is kept to a
minimum to avoid the chill effect of the casting process with dissimilar metals.
For example, the lower portion 18 of the valve seat 10 is of a reduced thickness
as compared to the upper portion 20 forming the upper lip 12. This reduces
the overall mass or volume of the valve seat 10 as compared to the mass or
volume of the metal forming the valve body surrounding the valve seat 10.
Preferably, the volume of a mass of the valve body material surrounding the
valve seat 10 is at least twice the volume of at least the embedded portion of
the valve seat 10 so as to minimize chill effects of the valve seat material while
the molten metal 8 of the valve body cools and hardens. These factors lessen
the chill effect or shrink rate between the valve seat 10 and the cooling metal 8
forming the valve body and the large relative surface area of the valve seat 10
which comes into contact with the molten metal 8 forming the valve body is
sufficiently large so as to encourage metal bonding to occur for a pressure-
tight and liquid seal interface therebetween.
11206832_1 (GHMatters) P110948.NZ
[Para 31] If the valve seat 10 did not have the configuration which enables it
to have a minimum material thickness, large surface area, and scalloped or
indented edge flange, then the valve body material 8 in the area of the valve
seat 10 would tend to cool too quickly, which could affect the shrink rate of the
body material 8 in and around the integrally cast seat 10, causing separations
or gaps between the contact surfaces of the valve seat 10 and the valve body
material or metal 8 which would create pressure leak paths across an area such
that a leakproof and pressure-tight union would not be formed between the
valve seat 10 and the valve body.
[Para 32] With reference now to a valve body 28 is shown having the
valve seat 10 integrally insert-cast therein. The valve seat 10 is disposed
intermediate a water inlet 30 and a water outlet 32 of the valve body 28. The
cylindrical and hollow nature of the valve seat 10 allows a fluid pathway
between the inlet 30 and the outlet 32 when the valve is in an open state.
[Para 33] The fluid pathway between the inlet 30 and outlet 32 of the valve
can be easily seen in the cross-sectional view of the valve of With
continuing reference to FIGS. 8 and 9, it can be seen that the volume of a mass
34 of the valve body 28 surrounding the seat 10 is significantly larger in volume
or mass than the valve seat 10, or at least a portion of the valve seat into which
it is adjacent to. Preferably, the volume of the mass 34 of the metal of the body
28 surrounding the valve seat 10 is at least twice a volume or mass of the valve
seat 10, in order to reduce chilling effects and create a pressure-tight seal
11206832_1 (GHMatters) P110948.NZ
therebetween. It will also be seen that the reduced thickness lower portion 18
and flange 24 of the valve seat 10 are embedded within the valve body 28
material. However, much of the upper portion 20 of the valve seat 10, which is
somewhat thicker than the reduced portion 18, extends above the valve body
28 material, so as not to negatively impact the bonding between the valve seat
and the valve body material as it cools and hardens, as described above.
However, a sufficiently large and sturdy upper lip or valve engaging surface 12
is provided so as to provide a sealing surface with a sealing valve member when
the valve is closed.
[Para 34] Although the valve seat 10 having the configuration and
arrangement embodying the present invention and insert-cast molded into a
valve body can be used with a variety of valves, it is particularly adapted and
designed for use in a waterworks control valve such as that illustrated in FIGS. 8
and 10. The valve seat 10 is insert-cast molded into the valve body 28, as
described above, such that it is within the fluid flow path intermediate the water
inlet 30 and the water outlet 32. A diaphragm 36 has an outer edge disposed
between the valve body 28 and a valve cover 38. A variable control chamber 40
is formed between the diaphragm 36 and the inner surface of the valve cover
38. The valve cover 38 is attached to the valve body, such as by using bolts or
other fasteners 42.
[Para 35] A valve stem 44 is operably coupled to a sealing valve member 46,
which as illustrated, is a disc retainer having a mold-in disc 48. The sealing
11206832_1 (GHMatters) P110948.NZ
valve member 46 is generally aligned with the valve seat 10, such that the
mold-in disc 48 can come into contact with the upper lip or surface 12 of the
valve seat 10 so as to seal the valve seat and prevent fluid flow from the inlet 30
to the outlet 32. The valve stem 44, and the attached sealing valve member 46
as well as a diaphragm washer 50 are movable between open and closed
positions. illustrates the assembly in an open position such that water or
other fluid can flow between the inlet 30 through valve seat 10 and to outlet 32.
A spring 52 acts to bias these movable components.
[Para 36] Pressure within the control chamber 40 can be adjusted in a
manner so as to cooperate or work against the bias of the spring 52 and the
pressures applied to the diaphragm 36 to open or close the valve sealing
member 46 against the valve seat 10 to open or close the valve and permit or
prevent fluid flow therebetween. For example, the spring 52 may bias the valve
sealing member 46 away from the valve seat 10 in an open position. However,
increasing the fluid pressure within the control chamber 40, such as
hydraulically utilizing other valves or devices, can pressurize the variable
control chamber and cause the moving components to be pressed downwardly
such that the sealing valve member 46, such as the mold-in disc 48 comes into
contact with the upper lip 12 of the valve seat 10 to close the valve 100. When
the valve is in a closed position, it is important that the interface and connection
between the valve seat 10 and the surrounding valve body material 8, 34 be
sealed and leakproof and pressure-tight so as to prevent water or other fluid to
11206832_1 (GHMatters) P110948.NZ
flow through the valve 100. When the valve is in a closed state, fluid pressure
can be substantial and even build at the inlet 30 portion of the valve 100, and
the interconnection between the valve seat 10 and the valve body 28 must be
able to withstand these pressures and remain fluidly sealed. The valve seat 10
arrangement and molding process of the present invention enable this to be the
case.
[Para 37] Although several embodiments have been described in detail for
purposes of illustration, various modifications may be made without departing
from the scope and spirit of the invention. Accordingly, the invention is not to
be limited, except as by the appended claims.
11206832_1 (GHMatters) P110948.NZ
Claims (24)
- [Claim 1] A method for molding a valve body having a valve seat of dissimilar material sealingly molded therein, comprising the steps of: providing a hollow valve seat comprised of a metal and having an upper lip configured to engage a sealing valve member, a bottom edge spaced from the upper lip at a lower portion of the seat, and a projection extending away from an outer surface of the seat intermediate the upper lip and bottom edge; placing the seat in a mold; and pouring a molten metal into the mold to form a valve body surrounding at least a portion of the seat, including the projection, such that the upper lip of the seat is exposed, and forming a fluid flow pathway through an inlet of the valve body, through the seat and to an outlet of the valve body; wherein the metal of the valve body is of a different material than the metal of the seat; and wherein a volume of a mass of the valve body surrounding the seat is at least twice a volume of at least an embedded portion of the seat so as to minimize chill effects of the seat material while the molten metal of the valve body cools and hardens such that a pressure tight and waterproof interface is formed between adjacent surfaces of the valve body and the seat. 11206832_1 (GHMatters) P110948.NZ
- [Claim 2] The method of claim 1, wherein the ratio of a seat surface area to a seat volume is sufficiently large to reduce the chilling effect of the surrounding valve body metal as it cools and hardens.
- [Claim 3] The method of claim 1, wherein the valve seat has a generally cylindrical configuration.
- [Claim 4] The method of claim 4, wherein the lower portion of the seat is of a reduced thickness as compared to an upper portion of the seat.
- [Claim 5] The method of claim 1, wherein the seat is comprised of a water corrosion resistant metal.
- [Claim 6] The method of claim 6, wherein the seat is comprised of stainless steel.
- [Claim 7] The method of claim 1, wherein the metal of the body comprises cast iron, ductile iron or steel.
- [Claim 8] The method of claim 1, wherein the projection comprises a circular flange having a plurality of spaced apart indentations along an outer perimeter thereof. 11206832_1 (GHMatters) P110948.NZ
- [Claim 9] The method of claim 8, wherein the indentations of the flange are closely spaced apart from one another along the perimeter of the flange.
- [Claim 10] The method of claim 8, wherein the perimeter of the flange has a scalloped configuration.
- [Claim 11] The method of claim 1, wherein the valve comprises a water works valve having the sealing valve member generally aligned with the valve seat and movable between an open position away from the valve seat to permit water to pass from the inlet to the outlet of the valve and a closed position in contact with the upper lip of the valve seat to prevent water from flowing to the outlet, and a diaphragm coupled to the sealing valve member and defining a variable control chamber with an inner wall or cover of the valve body.
- [Claim 12] A water works valve device, comprising: a valve body comprised of a metal and defining a water passageway between a water inlet and a water outlet of the body; a valve seat comprised of a metal different than the metal of the valve body insert-cast integral with the valve body, wherein a mass of the valve body surrounding the seat has at least twice the volume of a volume of an embedded portion of the valve seat so as to reduce a chilling effect during molding such 11206832_1 (GHMatters) P110948.NZ that a pressure tight and waterproof interface is formed between adjacent surfaces of the valve body and valve seat; a sealing valve member generally aligned with the valve seat and movable between an open position away from the valve seat to permit water to pass from the inlet to the outlet of the valve body, and a closed position against the valve seat to prevent water from passing from the inlet to the outlet of the body.
- [Claim 13] The water works valve device of claim 12, wherein the valve seat has an upper lip configured to engage the sealing valve member at an upper portion of the valve seat, and at least one projection extending away from an outer surface of the valve seat intermediate the upper lip and a lower portion of the valve seat embedded within the valve body.
- [Claim 14] The water works valve device of claim 12, wherein the valve seat is of a generally cylindrical configuration.
- [Claim 15] The water works valve device of claim 14, wherein a lower portion of the valve seat is of a reduced thickness as compared to an upper portion of the valve seat.
- [Claim 16] The water works device of claim 12, wherein the valve seat is comprised of a water corrosion resistant material. 11206832_1 (GHMatters) P110948.NZ
- [Claim 17] The water works device of claim 16, wherein the metal of the valve seat comprises stainless steel.
- [Claim 18] The water works device of claim 12, wherein the valve body is comprised of cast iron, ductile iron or steel.
- [Claim 19] The water works device of claim 12, wherein the seat includes at least one projection embedded in the valve body.
- [Claim 20] The water works device of claim 19, wherein the at least one projection comprises a circular flange having a plurality of spaced apart indentations along an outer perimeter thereof.
- [Claim 21] The water works device of claim 20, wherein the indentations of the flange are closely spaced apart from one another along the perimeter of the flange.
- [Claim 22] The water works device of claim 21, wherein the perimeter of the flange has a scalloped configuration. 11206832_1 (GHMatters) P110948.NZ
- [Claim 23] The water works device of claim 12, further comprising a diaphragm coupled to the sealing valve member and defining a variable control chamber with an inner wall or cover of the valve body.
- [Claim 24] The water works device of claim 12, wherein a ratio of an outer surface area of the seat compared to the volume of the seat is sufficiently large to reduce the chilling effect of the valve body as it cools and hardens while being molded to the seat. 11206832_1 (GHMatters) P110948.NZ
Publications (1)
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