1. An emission control valve for use in an emission control system of an internal combustion engine comprising:
valve body structure providing an inlet port at which flow enters the valve, an outlet port at which flow exits the valve, a valve element cooperating with a seat element for selectively restricting flow between the inlet port and the outlet port by selectively restricting flow through the seat element, an actuator for selectively positioning the valve element along an axis relative to the seat element, wherein the seat element comprises first and second valve seats axially spaced apart and the valve element comprises first and second closures axially spaced apart, each closure arranged to seat on the respective seat for closing flow between the inlet port and the outlet port and to unseat from the respective seat for allowing flow between the inlet port and the outlet port, and
wherein the seat element comprises an axially extending wall that circumscribes a space between its seats and that contains plural apertures through which that space is in open to one port.
2. A valve as set forth in claim 1 wherein the plural apertures comprise two apertures spanning essentially a semi-circumference of the seat element and separated by an axially extending bar in the wall.
3. A valve as set forth in claim 2 wherein the two apertures have essentially identical open areas.
4. A valve as set forth in claim 1 wherein the seat element is a machined metal part.
5. A valve as set forth in claim 1 wherein the one port is the inlet port through which flow enters the valve, and the first and second closures impart some degree of force-balance to the valve.
6. A valve as set forth in claim 1 wherein the valve body structure comprises a base, and the seat element is a separate part disposed within an interior space of the base.
7. A valve as set forth in claim 1 wherein a portion of the wall extends axially beyond one of the seats and contains at least one aperture through which space circumscribed by that portion of the wall is open to the other port.
8. A valve as set forth in claim 7 wherein the valve body structure comprises a base having an interior within which the seat element is disposed, and the at least one aperture opens to a passageway that runs through a wall of the base to the other port.
9. A valve as set forth in claim 7 wherein the at least one aperture comprises two apertures collectively spanning more than a semi-circumference of the seat element and separated by an axially extending bar in the wall.
10. A valve as set forth in claim 9 wherein the plural apertures comprise two apertures spanning essentially a semi-circumference of the seat element and separated by another axially extending bar in the wall, the two bars being substantially diametrically opposite each other.
11. A method of making a seat element for a double-pintle valve, the method comprising:
providing a cylindrical walled metal part, processing the part to create two axially spaced apart seats for seating respective closures of a double-pintle, two through-apertures separated by an axial bar in the cylindrical wall axially between the seats, and at least one through-aperture in the cylindrical wall axially beyond one seat relative to the other seat.
12. A method as set forth in claim 11 further comprising:
processing the part to create the at least one through-aperture in the cylindrical wall axially beyond one seat relative to the other seat as two through-apertures separated by another axial bar in the wall.
13. An internal combustion engine comprising an exhaust gas recirculation system for recirculating some engine exhaust gas through the engine via an exhaust gas recirculation valve external to engine combustion chambers wherein the valve comprises valve body structure providing an inlet port at which exhaust enters the valve, an outlet port at which exhaust exits the valve, a valve element cooperating with a seat element for selectively restricting flow between the inlet port and the outlet port by selectively restricting flow through the seat element, an actuator for selectively positioning the valve element along an axis relative to the seat element, wherein the seat element comprises first and second valve seats axially spaced apart and the valve element comprises first and second closures axially spaced apart, each closure arranged to seat on the respective seat for closing flow between the inlet port and the outlet port and to unseat from the respective seat for allowing flow between the inlet port and the outlet port, and wherein the seat element comprises an axially extending wall that circumscribes a space between its seats and that contains plural apertures through which that space is in open to the inlet port.
14. An engine as set forth in claim 13 wherein the plural apertures comprise two apertures spanning essentially a semi-circumference of the seat element and separated by an axially extending bar in the wall.
15. An engine as set forth in claim 14 wherein the two apertures have essentially identical open areas.
16. An engine as set forth in claim 13 wherein the first and second closures impart some degree of force-balance to the valve.
17. An engine as set forth in claim 13 wherein a portion of the wall extends axially beyond one of the seats and contains at least one aperture through which space circumscribed by that portion of the wall is open to the outlet port.
18. An engine as set forth in claim 17 wherein the valve body structure comprises a base having an interior within which the seat element is disposed, and the at least one aperture opens to a passageway that runs through a wall of the base to the outlet port.
19. An engine as set forth in claim 17 wherein the at least one aperture comprises two apertures collectively spanning more than a semi-circumference of the seat element and separated by an axially extending bar in the wall.
20. An engine as set forth in claim 13 wherein the engine comprises a diesel engine and the exhaust gas recirculation system recirculates diesel exhaust gases.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A seed of cotton cultivar designated DP 543 BGIIRR, wherein a representative sample of seed of said cultivar was deposited under ATCC Accession No. PTA-5857.
2. A cotton plant, or a part thereof, produced by growing the seed of claim 1.
3. A tissue culture of regenerable cells produced from the plant of claim 2.
4. A protoplast produced from the tissue culture of claim 3.
5. The tissue culture of claim 3, wherein cells of the tissue culture are produced from a plant part selected from the group consisting of leaves, pollen, embryos, roots, root tip, anthers, pistils, flowers, seeds, bolls, and stems.
6. A cotton plant regenerated from the tissue culture of claim 3, said plant having all the morphological and physiological characteristics of cultivar DP 543 BGIIRR, representative seed of said cultivar having been deposited under ATCC Accession No. PTA-5857.
7. A method for producing an F1 hybrid cotton seed, wherein the method comprises crossing the plant of claim 2 with a different cotton plant and harvesting the resultant F1 hybrid cotton seed.
8. A method for producing a male sterile cotton plant wherein the method comprises transforming the cotton plant of claim 2 with a nucleic acid molecule that confers male sterility.
9. A male sterile cotton plant produced by the method of claim 8.
10. A method of producing an herbicide resistant cotton plant wherein the method comprises transforming the cotton plant of claim 2 with a transgene that confers herbicide resistance.
11. An herbicide resistant cotton plant produced by the method of claim 10.
12. The cotton plant of claim 11, wherein the transgene confers resistance to an herbicide selected from the group consisting of imidazolinone, sulfonylurea, glyphosate, glufosinate, L-phosphinothricin, triazine and benzonitrile.
13. A method of producing an insect resistant cotton plant wherein the method comprises transforming the cotton plant of claim 2 with a transgene that confers insect resistance.
14. An insect resistant cotton plant produced by the method of claim 13.
15. The cotton plant of claim 14, wherein the transgene encodes a Bacillus thuringiensis endotoxin.
16. A method of producing a disease resistant cotton plant wherein the method comprises transforming the cotton plant of claim 2 with a transgene that confers disease resistance.
17. A disease resistant cotton plant produced by the method of claim 16.
18. A method of producing a cotton plant with modified fatty acid metabolism or modified carbohydrate metabolism wherein the method comprises transforming the cotton plant of claim 2 with a transgene encoding a protein selected from the group consisting of, fructosyltransferase, levansucrase, alpha-amylase, invertase and starch branching enzyme or encoding an antisense of stearyl-ACP desaturase.
19. A cotton plant having modified fatty acid or modified carbohydrate metabolism produced by the method of claim 18.
20. A cotton plant, or a part thereof, having all the physiological and morphological characteristics of the cultivar DP 543 BGIIRR, representative seed of said cultivar having been deposited under ATCC Accession No. PTA-5857.
21. A method of introducing a desired trait into cotton cultivar DP 543 BGIIRR wherein the method comprises:
(a) crossing DP 543 BGIIRR plants grown from DP 543 BGIIRR seed, representative seed of which has been deposited under ATCC Accession No. PTA-5857, with plants of another Gossypium hirsutum cultivar that comprise a desired trait to produce progeny plants, wherein the desired trait is selected from the group consisting of modified fatty acid metabolism, modified carbohydrate metabolism, male sterility, herbicide resistance, insect resistance and disease resistance;
(b) selecting progeny plants that have the desired trait to produce selected progeny plants;
(c) crossing the selected progeny plants with the DP 543 BGIIRR plants to produce backcross progeny plants;
(d) selecting for backcross progeny plants that have the desired trait and all of the physiological and morphological characteristics of cotton cultivar DP 543 BGIIRR listed in Table 1 to produce selected backcross progeny plants; and
(e) repeating steps (c) and (d) three or more times in succession to produce selected fourth or higher backcross progeny plants that comprise the desired trait and all of the physiological and morphological characteristics of cotton cultivar DP 543 BGIIRR listed in Table 1.
22. A cotton plant produced by the method of claim 21, wherein the plant has the desired trait and all of the physiological and morphological characteristics of cotton cultivar DP 543 BGIIRR listed in Table 1.
23. The cotton plant of claim 22 wherein the desired trait is herbicide resistance and the resistance is conferred to an herbicide selected from the group consisting of imidazolinone, sulfonylurea, glyphosate, glufosinate, L-phosphinothricin, triazine and benzonitrile.
24. The cotton plant of claim 22 wherein the desired trait is insect resistance and the trait is conferred by a nucleic acid molecule encoding a Bacillus thuringiensis endotoxin.
25. The cotton plant of claim 22 wherein the desired trait is male sterility and the trait is conferred by a cytoplasmic nucleic acid molecule that confers male sterility.