1. An apparatus comprising:
a spray valve used as part of a dosing valve assembly, the spray valve including:
a valve body having a lower tapered portion and an aperture;
a valve needle movably disposed in the aperture of the valve body, the valve needle having a tapered portion;
an upper surface formed as part of the tapered portion;
a lower surface formed as part of the lower tapered portion, the upper surface and lower surface forming an angled interface; and
wherein a reducing agent flows through the spray valve such that pressure builds between the upper surface and the lower surface, placing the spray valve in an open position, allowing the fuel to pass through the angled interface, delivering the reducing agent to at least a portion of an exhaust system.
2. The apparatus of claim 1, the dosing valve assembly further comprising:
a control valve assembly;
a fuel injector being part of the control valve assembly; and
a spray valve assembly, the spray valve being part of the spray valve assembly;
wherein the fuel injector releases a predetermined quantity of the reducing agent from the control valve assembly such that the reducing agent flows from the control valve assembly to the spray valve assembly.
3. The apparatus of claim 2, the spray valve assembly further comprising:
a body portion having an inlet for receiving the reducing agent from the control valve assembly;
a circumferential lip integrally formed with the body portion;
an exhaust boss having a flange;
a mounting clip having upper flanges and lower flanges, the circumferential lip and the flange at least partially disposed between the upper flanges and lower flanges, connecting the exhaust boss to the body portion; and
a channel formed as part of the exhaust boss, the body portion at least partially disposed in the channel formed as part of the exhaust boss.
4. The apparatus of claim 3, the exhaust boss further comprising;
a central portion, the flange integrally formed with the central portion; and
an enlarged base portion integrally formed with the central portion, at least a portion of the channel formed as part of the exhaust boss extending through the enlarged base portion and the central portion.
5. The apparatus of claim 3, further comprising a capillary delivery tube connected to the inlet of the body portion and the fuel injector such that the fuel injector transfers the reducing agent to the inlet of the body portion through the capillary delivery tube.
6. The apparatus of claim 1, the spray valve further comprising:
a spring clip disposed in a groove formed as part of the valve needle; and
a spring disposed in the aperture of the valve body in an area between the spring clip and a lower ledge formed as part of the valve body such that the spring applies a biasing force to the spring clip and the lower ledge to bias the valve needle toward a closed position;
wherein the reducing agent flows into the spray valve such that pressure builds between the upper surface and the lower surface, overcoming the biasing force applied to the valve needle, placing the spray valve in the open position.
7. The apparatus of claim 1, the valve needle further comprising at least one deformation in sliding contact with the inside surface of the aperture formed as part of the valve body, reducing the contact area between the valve needle and the valve body.
8. The apparatus of claim 1, wherein the reducing agent is a fuel.
9. A dosing valve assembly, comprising:
a control valve assembly;
a spray valve assembly;
a spray valve which is part of the spray valve assembly;
a valve body having a lower tapered portion, the valve body being part of the spay valve;
a valve needle having a tapered portion, the valve needle being part of the spray valve, the valve needle slidably disposed within the valve body to change the spray valve between an open position and a closed position;
an upper surface integrally formed with the tapered portion;
a lower surface integrally formed with the lower tapered portion such that the upper surface is in proximity to the lower surface, forming an angled interface; and
wherein a reducing agent flows through the spray valve to the angled interface such that pressure builds between the upper surface and the lower surface, placing the spray valve in an open position, allowing the fuel to pass through the angled interface, delivering the reducing agent to at least a portion of an exhaust system.
10. The dosing valve assembly of claim 9, the spray valve assembly further comprising:
a mounting clip;
at least one upper flange formed as part of the mounting clip;
at least one lower flange formed as part of the mounting clip;
a body portion;
a circumferential lip formed as part of the body portion; and
an exhaust boss having a flange adjacent the circumferential lip;
wherein the circumferential lip and the flange are adjacent one another, and disposed between the at least one upper flange and the at least one lower flange, connecting the exhaust boss to the body portion.
11. The dosing valve assembly of claim 10, further comprising:
a fuel injector, the fuel injector being part of the control valve assembly;
an inlet formed as part of the body portion; and
a capillary delivery tube connected to the fuel injector and the inlet for placing the spay valve assembly in fluid communication with the fuel injector.
12. The dosing valve assembly of claim 9, the exhaust boss further comprising:
a central portion;
an enlarged base portion integrally formed with the central portion; and
a channel extending through the central portion and the enlarged base portion, the body portion at least partially extending through the channel;
wherein the enlarged base portion is mounted to an exhaust manifold such that the spray valve selectively injects the reducing agent into the exhaust manifold.
13. The dosing valve assembly of claim 9, the spray valve further comprising:
a spring clip;
a lower ledge integrally formed with the valve body; and
a spring disposed inside the valve body between the spring clip and the lower ledge such that the spring is in compression and circumscribes the valve needle, biasing the valve needle toward a closed position;
wherein as the reducing agent flows through the spray valve such that pressure builds between the upper surface and the lower surface, the valve needle moves, placing the spray valve in the open position.
14. The dosing valve assembly of claim 9, further comprising at least one deformation in sliding contact with the inside surface of an aperture formed as part of the valve body, reducing the contact area between the valve needle and the valve body.
15. A dosing valve assembly, comprising:
a control valve assembly;
a fuel injector, the fuel injector being part of the control valve assembly;
a spray valve assembly having a spray valve which includes a valve needle and a valve body which includes an aperture, the valve needle movably disposed within the aperture of the valve body;
a capillary delivery tube for placing the fuel injector in fluid communication with the spray valve assembly;
a tapered portion formed as part of the valve needle;
an upper surface formed as part of the tapered portion;
a lower tapered portion formed as part of the valve body of the spray valve;
a lower surface formed as part of the lower tapered portion; and
an angled interface formed by the upper surface and the lower surface which a reducing agent passes through when the spray valve is in an open position;
wherein the spray valve assembly delivers the reducing agent to at least a portion of an exhaust system.
16. The dosing valve assembly of claim 15, the spray valve assembly further comprising:
a mounting clip having upper flanges and lower flanges;
a body portion having an inlet, the capillary delivery tube connected to the inlet, the spray valve being at least partially disposed in the body portion;
a exhaust boss having a channel and a flange, the body portion at least partially disposed in the channel; and
a circumferential lip formed as part of said body portion and adjacent the flange such that the upper flanges and the lower flanges at least partially surround and contact the circumferential lip and the flange.
17. The dosing valve assembly of claim 15, the exhaust boss further comprising:
a central portion, the flange integrally formed with the central portion; and
an enlarged base portion integrally formed with the central portion, the channel of the exhaust boss extending through both the central portion and enlarged base portion, and the enlarged base portion is mounted to an exhaust manifold such that the spray valve selectively delivers the reducing agent to the exhaust manifold.
18. The dosing valve assembly of claim 15, the spray valve further comprising:
a spring clip disposed in a groove formed as part of the valve needle; and
a spring disposed in the aperture of the valve body in an area between the spring clip and a lower ledge formed as part of the valve body such that the spring applies a biasing force to the spring clip and the lower ledge to bias the valve needle toward a closed position;
wherein the valve body is at least partially disposed in the channel of the exhaust boss, the valve needle disposed in the valve body.
19. The dosing valve assembly of claim 18, wherein the reducing agent is a fuel which flows into the spray valve from the control valve assembly such that pressure builds between the upper surface and the lower surface, overcoming the biasing force applied to the valve needle, placing the spray valve in an open position, allowing the fuel to pass through the angled interface.
20. The dosing valve assembly of claim 15, the valve needle further comprising a plurality of deformations, each of the plurality of deformations contacting a different area of the inside surface of the aperture formed as part of the valve body, reducing the contact area between the valve needle and the valve body.
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 compound of the formula:
wherein R1 is H or C1-6 alkyl or C2-6 alkenyl; and R2 is H or C1-6 alkyl or C2-6 alkenyl.
2. The compound according to claim 1, wherein R1 is methyl and R2 is methyl.
3. A method of chemiluminescent labeling of a nucleic acid, said method comprising combining the compound according to claim 1 with a nucleic acid and exposing the combination to UV light.
4. A method of chemiluminescent labeling of a nucleic acid, said method comprising combining the compound according to claim 2 with a nucleic acid and exposing the combination to UV light.