US3028874A - Valve - Google Patents

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Publication number
US3028874A
US3028874A US85021459A US3028874A US 3028874 A US3028874 A US 3028874A US 85021459 A US85021459 A US 85021459A US 3028874 A US3028874 A US 3028874A
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US
United States
Prior art keywords
valve
molten metal
degrees
metal
annulus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
Inventor
Francis L Burkett
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dow Chemical Co
Original Assignee
Dow Chemical Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dow Chemical Co filed Critical Dow Chemical Co
Priority to US85021459 priority Critical patent/US3028874A/en
Priority to GB3552460A priority patent/GB903530A/en
Priority to CH1219060A priority patent/CH423110A/en
Application granted granted Critical
Publication of US3028874A publication Critical patent/US3028874A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/30—Accessories for supplying molten metal, e.g. in rations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D39/00—Equipment for supplying molten metal in rations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/60—Pouring-nozzles with heating or cooling means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K25/00—Details relating to contact between valve members and seats
    • F16K25/04—Arrangements for preventing erosion, not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K49/00—Means in or on valves for heating or cooling
    • F16K49/002—Electric heating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K51/00—Other details not peculiar to particular types of valves or cut-off apparatus
    • F16K51/02—Other details not peculiar to particular types of valves or cut-off apparatus specially adapted for high-vacuum installations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/6416—With heating or cooling of the system
    • Y10T137/6579—Circulating fluid in heat exchange relationship

Definitions

  • valve for metering molten metal shown in the above mentioned patent is an excellent one, when the valve seat or the valve becomes worn or excessively misaligned some dripping or dribbling of molten metal, which is undesirable, can occur through the valve.
  • a principal object of this invention is to provide an improved valve for controlling the flow of molten metal therethrough.
  • Another object of this invention is to provide an improved, longer wearing valve for use in metering molten metal.
  • a further object of this invention is to provide an improved non-dripping valve for use in metering light metals.
  • a valve seat adapted to receive a plunger having a valve at one end thereof. Adhering to the valve seat and in sealing contact with the valve when it is in a closed position is a layer of semi-molten metal of generally mushlike consistency. Means are provided to maintain the valve seat at a predetermined temperature to keep the sealing layer in a semi-molten condition.
  • FIG. 1 is a side elevational view, partly in section, of the valve assembly of the invention
  • FIG. 2 is a fragmentary view, in section of the lower or valve end of FIG. 1, and
  • FIG. 3 is a sectional view taken along the line 3--3 of FIG. 2.
  • the valve assembly 10 comprises a cylindrical liner or wall part 12 having an entry port 14 for molten metal disposed between the ends of the liner.
  • a packing gland assembly 16 is disposed at the upper end of the liner and a valve seat in the form of an annulus 18 having a central opening 20, is disposed at the lower end of the liner.
  • a hemispherically shaped valve 22 is disposed at the lower end of a cylindrical valve stem 24 whose upper part 25 extends through the packing gland assembly 16 and is actuated by suitable drive means (not shown).
  • valve stem 24 Near the lower end of and around the valve stem 24 are affixed spacer elements 27 which maintain the lower end of the valve stem substantially centrally disposed in the valve liner 12.
  • the valve assembly 10 includes a heating jacket 26 and electrical resistance heating elements 2 8.
  • the feed tube 30 which communicates with the port 14 is also jacketed and contains heating elements.
  • valve seat 18 is welded or otherwise sealed to the liner 12 along its outer periphery.
  • the upper side 32 of the ice 2 annulus 18 is beveled and slopes downwardly and inwardly towards the central opening 20, the bevel giving the top side of the annulus the form of a conical recess.
  • An annular cooling channel 34 is disposed in the body of the annulus 18.
  • the cooling channel 34 has an inlet tube 36 and an outlet tube 38 for feeding fluid coolant through and out of the channel 34.
  • a source of fluid (not shown), such as water, for example, .is coupled to the inlet tube. While the coolant is circulated, a layer 40 of semi-solid or spongy metal adheres to the beveled face of the annulus;
  • the layer 40 usually is composed of a magnesium base or aluminum base alloy. It is the spongy layer 40 which actually becomes the valve seat in this invention on putting the apparatus into operation.
  • sufiicient coolant is circulated through the channel 34 to cause partial solidification of part of the metal 42, passing through or to be passed through the valve into the die casting apparatus from the source of molten metal to be die-cast, as a layer 40 of slush or semi-solid metal adhering to the upper side 32 of the annulus 19.
  • valve 22 When the valve 22 is closed it seats against the spongy, semi-solid layer 40, sealing completely even though the valve 22 or the upper or seat side 32 of the annulus 18 may have surface irregularities and not mate together perfectly with the annulus.
  • the degree of cooling of the valve seat required to produce the semi-solid layer 40 varies with the type of molten metal which is to pass through the valve.
  • the temperature of the surface 32 was kept within the range of 700 degrees to 1100 degrees F. and preferably within the range of 920 to 950 degrees F.
  • valve and valve seat are preferably made of materials which are resistant to erosion and corrosion such as silicon carbide or metal borides or carbides, for example.
  • valve has been described with respect to aluminum and magnesium alloys as the metal to be cast, the valve may be also used with zinc.
  • a valve assembly for metering molten light metal comprising an annular valve seat body including a frusto-' conical shaped depression having a seating surface including a semi-molten layer of said light metal continuously disposed thereon and adhering thereto, a valve having a hemispherical seating end aligned with said depression and adapted to seat thereagainst, and means for maintaining said surface within a predetermined temperature range.
  • a valve assembly in accordance with claim 1, wherein said means for maintaining said surface Within a predetermined temperature range includes a coolant flow channel disposed adjacent tosaid surface.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lift Valve (AREA)

Description

April 10, 1962 F. BURKETT 3,028,874
VALVE Filed Nov. 2, 1959 58 12 22 20 13 54 56 INVENTOR.
18 Franc/l9 1.. Burke United States Patent 3,028,874 VALVE Francis L. Burkett, Breckenridge, Mich., assignor to The Dow Chemical Company, Midland, Mich., a corporation of Delaware Filed Nov. 2, 1959, Ser. No. 850,214 7 Claims. (Cl. 137--340) This invention relates to valves and particularly to valves for use in controlling the flow of molten metal.
The delivering of a measured quantity of molten metal to the shot well of a die casting machine has received considerable attention in the die casting art. One example of how to do this is disclosed and claimed in U.S. Patent No. 2,745,153, entitled Apparatus for Dispersing Shots of Molten Metal, issued to F. L. Burkett.
While the valve for metering molten metal shown in the above mentioned patent is an excellent one, when the valve seat or the valve becomes worn or excessively misaligned some dripping or dribbling of molten metal, which is undesirable, can occur through the valve.
Accordingly, a principal object of this invention is to provide an improved valve for controlling the flow of molten metal therethrough.
Another object of this invention is to provide an improved, longer wearing valve for use in metering molten metal.
A further object of this invention is to provide an improved non-dripping valve for use in metering light metals.
In accordance with this invention there is provided a valve seat adapted to receive a plunger having a valve at one end thereof. Adhering to the valve seat and in sealing contact with the valve when it is in a closed position is a layer of semi-molten metal of generally mushlike consistency. Means are provided to maintain the valve seat at a predetermined temperature to keep the sealing layer in a semi-molten condition.
The invention, as well as additional objects and advantages thereof will best be understood when the following detailed description is read in connection with the accompanying drawing, in which:
FIG. 1 is a side elevational view, partly in section, of the valve assembly of the invention;
FIG. 2 is a fragmentary view, in section of the lower or valve end of FIG. 1, and
FIG. 3 is a sectional view taken along the line 3--3 of FIG. 2.
Referring to FIG. 1, there is shown a shot dispensing valve assembly of a type used in connection with die casting apparatus. The valve assembly 10 comprises a cylindrical liner or wall part 12 having an entry port 14 for molten metal disposed between the ends of the liner. A packing gland assembly 16 is disposed at the upper end of the liner and a valve seat in the form of an annulus 18 having a central opening 20, is disposed at the lower end of the liner. A hemispherically shaped valve 22 is disposed at the lower end of a cylindrical valve stem 24 whose upper part 25 extends through the packing gland assembly 16 and is actuated by suitable drive means (not shown).
Near the lower end of and around the valve stem 24 are affixed spacer elements 27 which maintain the lower end of the valve stem substantially centrally disposed in the valve liner 12.
The valve assembly 10 includes a heating jacket 26 and electrical resistance heating elements 2 8. The feed tube 30 which communicates with the port 14 is also jacketed and contains heating elements.
As shown in FIGS. 2 and 3, as well as in FIG. 1, the valve seat 18 is welded or otherwise sealed to the liner 12 along its outer periphery. The upper side 32 of the ice 2 annulus 18 is beveled and slopes downwardly and inwardly towards the central opening 20, the bevel giving the top side of the annulus the form of a conical recess.
An annular cooling channel 34 is disposed in the body of the annulus 18. The cooling channel 34 has an inlet tube 36 and an outlet tube 38 for feeding fluid coolant through and out of the channel 34. A source of fluid (not shown), such as water, for example, .is coupled to the inlet tube. While the coolant is circulated, a layer 40 of semi-solid or spongy metal adheres to the beveled face of the annulus; The layer 40 usually is composed of a magnesium base or aluminum base alloy. It is the spongy layer 40 which actually becomes the valve seat in this invention on putting the apparatus into operation.
In operation sufiicient coolant is circulated through the channel 34 to cause partial solidification of part of the metal 42, passing through or to be passed through the valve into the die casting apparatus from the source of molten metal to be die-cast, as a layer 40 of slush or semi-solid metal adhering to the upper side 32 of the annulus 19.
When the valve 22 is closed it seats against the spongy, semi-solid layer 40, sealing completely even though the valve 22 or the upper or seat side 32 of the annulus 18 may have surface irregularities and not mate together perfectly with the annulus.
The degree of cooling of the valve seat required to produce the semi-solid layer 40 varies with the type of molten metal which is to pass through the valve. For example, when working with an aluminum alloy having a casting temperature of about 1200 degrees F. a nominal composition of 9 /2 parts silicon, 4 parts copper, balance aluminum, (total equals parts) the temperature of the surface 32 was kept within the range of 700 degrees to 1100 degrees F. and preferably within the range of 920 to 950 degrees F.
When an alloy composed nominally of 9 parts aluminum, 1 part zinc, balance magnesium (total equals 100 parts) having a casting temperature of about 1200 degrees F., the temperature at the surface 32 was held within 7 a range of from 600 degrees to 1100 degrees F. and preferably between 820 degrees and 850' degrees F. Other alloys will, of course, require that the upper part 32 be held within other temperature ranges, yielding semi-solid metal or a slush, which may readily be determined by trial.
The valve and valve seat are preferably made of materials which are resistant to erosion and corrosion such as silicon carbide or metal borides or carbides, for example.
While the valve has been described with respect to aluminum and magnesium alloys as the metal to be cast, the valve may be also used with zinc.
I claim:
1. A valve assembly for metering molten light metal comprising an annular valve seat body including a frusto-' conical shaped depression having a seating surface including a semi-molten layer of said light metal continuously disposed thereon and adhering thereto, a valve having a hemispherical seating end aligned with said depression and adapted to seat thereagainst, and means for maintaining said surface within a predetermined temperature range.
2. A valve assembly in accordance with claim 1, wherein said means for maintaining said surface Within a predetermined temperature range includes a coolant flow channel disposed adjacent tosaid surface.
3. A valve assembly in accordance with claim 1, where in means are provided for centering said valve with re spect to said valve seat body.
4. A valve assembly in accordance with claim 1, where- References Cited in the file of this patent UNITED STATES PATENTS Friedman Dec. 17, 1929 Tyson July 21, 1953 McMullen Aug. 2, 1955 Dayton Nov. 27, 1956 Bidner Apr. 28, 1959
US85021459 1959-11-02 1959-11-02 Valve Expired - Lifetime US3028874A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US85021459 US3028874A (en) 1959-11-02 1959-11-02 Valve
GB3552460A GB903530A (en) 1959-11-02 1960-10-17 A valve for metering the flow of molten metal
CH1219060A CH423110A (en) 1959-11-02 1960-10-31 Method and valve for preventing a molten metal from dripping through a supply valve, valve for carrying out the method and application of the method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US85021459 US3028874A (en) 1959-11-02 1959-11-02 Valve

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US3028874A true US3028874A (en) 1962-04-10

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CH (1) CH423110A (en)
GB (1) GB903530A (en)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3101094A (en) * 1963-08-20 High temperature valve
US3124854A (en) * 1964-03-17 James
US3149190A (en) * 1962-08-16 1964-09-15 Harold A Neustaedter Lead smelting
US3160391A (en) * 1962-01-24 1964-12-08 Gustav K Medicus Valve seats for high temperature and high vacuum environments
US3192582A (en) * 1962-10-03 1965-07-06 Harbison Walker Refractories Bottom pour ladle nozzle and stopper rod construction
US3211169A (en) * 1963-10-01 1965-10-12 James E Webb Shrink-fit gas valve
US3381703A (en) * 1965-04-07 1968-05-07 Whittaker Corp Self-adjusting valve seat
US3487843A (en) * 1967-12-19 1970-01-06 Republic Steel Corp Ladle preparation
US3604598A (en) * 1969-07-09 1971-09-14 United States Steel Corp Outlet passage construction for teeming vessels
US3655176A (en) * 1969-02-27 1972-04-11 Stoecker & Kunz Gmbh Closure devices for metallurgical and like vessels
US3877481A (en) * 1972-07-26 1975-04-15 Ca Atomic Energy Ltd Valve assembly
US3921671A (en) * 1973-12-19 1975-11-25 Asea Ab Electromagnetic valve for molten metal
US4271993A (en) * 1975-11-27 1981-06-09 British Gas Corporation Slag tap for coal slagging gasifier
US4671314A (en) * 1983-07-05 1987-06-09 Heil John S Flow line sampler valve apparatus
US4715400A (en) * 1983-03-09 1987-12-29 Xomox Corporation Valve and method of making same
US5383488A (en) * 1994-01-31 1995-01-24 Imtec Products, Inc. Apparatus and method for protecting chemical bath seals
WO2002057670A1 (en) * 2001-01-19 2002-07-25 Zimmer Ag Closing body for closing a pipe and corresponding method
EP1404290A1 (en) * 2001-06-06 2004-04-07 NL Technologies, Ltd. Thermally insulating interfaces
WO2005106303A1 (en) * 2004-04-27 2005-11-10 Von Ardenne Anlagentechnik Gmbh Valve used for vapor-tightly disconnecting two interconnected process units

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4471831A (en) * 1980-12-29 1984-09-18 Allied Corporation Apparatus for rapid solidification casting of high temperature and reactive metallic alloys
EP0055827B1 (en) * 1980-12-29 1985-01-30 Allied Corporation Heat extracting crucible for rapid solidification casting of molten alloys
US4624189A (en) * 1984-02-27 1986-11-25 Loevinger Richard P Heated outlet valve for railway tank car
DE19925038C2 (en) * 1999-06-01 2002-03-28 Didier Werke Ag Method and device for heat repairing an outlet of an in particular metallurgical vessel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1740420A (en) * 1929-12-17 of cleveland
US2646065A (en) * 1950-12-01 1953-07-21 Standard Oil Dev Co Valve
US2714622A (en) * 1953-03-03 1955-08-02 Carborundum Co Method and apparatus for fiberizing refractory materials
US2771900A (en) * 1953-06-22 1956-11-27 Cons Electrodynamics Corp Liquid seals
US2883722A (en) * 1958-11-24 1959-04-28 Bidner John Method and apparatus for freeing stopper rod in bottom pouring steel ladle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1740420A (en) * 1929-12-17 of cleveland
US2646065A (en) * 1950-12-01 1953-07-21 Standard Oil Dev Co Valve
US2714622A (en) * 1953-03-03 1955-08-02 Carborundum Co Method and apparatus for fiberizing refractory materials
US2771900A (en) * 1953-06-22 1956-11-27 Cons Electrodynamics Corp Liquid seals
US2883722A (en) * 1958-11-24 1959-04-28 Bidner John Method and apparatus for freeing stopper rod in bottom pouring steel ladle

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3101094A (en) * 1963-08-20 High temperature valve
US3124854A (en) * 1964-03-17 James
US3160391A (en) * 1962-01-24 1964-12-08 Gustav K Medicus Valve seats for high temperature and high vacuum environments
US3149190A (en) * 1962-08-16 1964-09-15 Harold A Neustaedter Lead smelting
US3192582A (en) * 1962-10-03 1965-07-06 Harbison Walker Refractories Bottom pour ladle nozzle and stopper rod construction
US3211169A (en) * 1963-10-01 1965-10-12 James E Webb Shrink-fit gas valve
US3381703A (en) * 1965-04-07 1968-05-07 Whittaker Corp Self-adjusting valve seat
US3487843A (en) * 1967-12-19 1970-01-06 Republic Steel Corp Ladle preparation
US3655176A (en) * 1969-02-27 1972-04-11 Stoecker & Kunz Gmbh Closure devices for metallurgical and like vessels
US3604598A (en) * 1969-07-09 1971-09-14 United States Steel Corp Outlet passage construction for teeming vessels
US3877481A (en) * 1972-07-26 1975-04-15 Ca Atomic Energy Ltd Valve assembly
US3921671A (en) * 1973-12-19 1975-11-25 Asea Ab Electromagnetic valve for molten metal
US4271993A (en) * 1975-11-27 1981-06-09 British Gas Corporation Slag tap for coal slagging gasifier
US4715400A (en) * 1983-03-09 1987-12-29 Xomox Corporation Valve and method of making same
US4671314A (en) * 1983-07-05 1987-06-09 Heil John S Flow line sampler valve apparatus
US5383488A (en) * 1994-01-31 1995-01-24 Imtec Products, Inc. Apparatus and method for protecting chemical bath seals
WO1995020740A1 (en) * 1994-01-31 1995-08-03 Imtec Products, Inc. Apparatus and method for protecting chemical bath seals
WO2002057670A1 (en) * 2001-01-19 2002-07-25 Zimmer Ag Closing body for closing a pipe and corresponding method
EP1404290A1 (en) * 2001-06-06 2004-04-07 NL Technologies, Ltd. Thermally insulating interfaces
US20060157113A1 (en) * 2001-06-06 2006-07-20 Newberg Douglas A Thermally insulating interfaces
EP1404290A4 (en) * 2001-06-06 2007-03-21 Nl Technologies Ltd Thermally insulating interfaces
WO2005106303A1 (en) * 2004-04-27 2005-11-10 Von Ardenne Anlagentechnik Gmbh Valve used for vapor-tightly disconnecting two interconnected process units
US20070209710A1 (en) * 2004-04-27 2007-09-13 Von Ardenne Anlagentechnik Gmbh Valve used for vapor-tightly disconnecting two interconnected process units

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Publication number Publication date
GB903530A (en) 1962-08-15
CH423110A (en) 1966-10-31

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