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A method and apparatus for controlling a flow of a fluid through a valve. In one illustrative embodiment, an apparatus comprises an elongate member, an actuation device, and a valve body. The actuation device is configured to move the elongate member, which may be associated with the actuation devic

A method and apparatus for controlling a flow of a fluid through a valve. In one illustrative embodiment, an apparatus comprises an elongate member, an actuation device, and a valve body. The actuation device is configured to move the elongate member, which may be associated with the actuation device, between an open position and a closed position. The valve body is configured for attachment to the actuation device such that the elongate member is positioned within the valve body. Fluid that flows into the valve body from a fluid source is allowed to flow out of the valve body when the elongate member is in the open position.

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1. An apparatus comprising: an elongate member;an actuation device that moves the elongate member, which is associated with the actuation device, away from the actuation device to an open position and toward from the actuation device to a closed position; anda valve body attached to the actuation de

1. An apparatus comprising: an elongate member;an actuation device that moves the elongate member, which is associated with the actuation device, away from the actuation device to an open position and toward from the actuation device to a closed position; anda valve body attached to the actuation device such that the elongate member is positioned within the valve body in which fluid that flows into the valve body from a fluid source flows out of the valve body when the elongate member is in the open position; the elongate member, positioned within the valve body, comprising a plug portion at one end of the elongate member, and associated with the actuation device such that the actuation device moves the elongate member linearly in a direction along an axis between the open position and the closed position; and the valve body comprising: a hollow portion; a connecting channel connected to the hollow portion and comprising a first diameter, the first diameter being constant; a second channel, connected at one end to the connecting channel and open at a second end, and comprising a diameter that expands from the first diameter to a second diameter, the second diameter being constant, and narrows from the second diameter to a third diameter, the third diameter being constant, such that the plug portion forms an interference fit with the connecting channel when the elongate member is in the closed position, the connecting channel being narrower than both the hollow portion and the second channel. 2. The apparatus of claim 1, further comprising the valve body being disposable and wherein removing the valve body from the actuation device allows access to the elongate member such that the elongate member can be cleaned. 3. The apparatus of claim 1 further comprising: a first element associated with the valve body that attaches to the fluid source, wherein the fluid flows into the valve body from the fluid source through the first element; anda second element associated with the valve body in which the fluid flows out of the valve body through the second element when the elongate member is in the open position. 4. The apparatus of claim 3, wherein the first element is a first protrusion extending from the valve body comprising a first channel through which the fluid flows. 5. The apparatus of claim 3, wherein the second element is a second protrusion extending from the valve body comprising the second channel through which the fluid flows. 6. The apparatus of claim 3, wherein at least a portion of the second element forms a nozzle through which the fluid is dispensed onto a surface. 7. The apparatus of claim 1, wherein moving the elongate member in the direction towards the actuation device creates a negative pressure within the second element that prevents the fluid from flowing out of the second channel. 8. The apparatus of claim 3, wherein the first element comprises a first channel and the second element comprises the second channel and wherein the fluid is allowed to flow into the second channel from the first channel when the elongate member is in the open position and prevented from flowing into the second channel from the first channel when the elongate member is in the closed position. 9. The apparatus of claim 1, wherein the fluid comprises a viscosity within a selected range. 10. The apparatus of claim 9, wherein the fluid comprising the viscosity within the selected range is a sealant. 11. The apparatus of claim 1 further comprising: the fluid source. 12. The apparatus of claim 1 further comprising: a nozzle associated with the valve body in which the fluid is dispensed through the nozzle onto a surface. 13. The apparatus of claim 12 further comprising: a number of fluid transfer elements configured to connect the nozzle to the valve body. 14. A fluid dispensing system comprising: a fluid source holding fluid comprising a viscosity within a selected range;an elongate member, positioned within a valve body, comprising a plug portion at one end of the elongate member;an actuation device that moves the elongate member, which is associated with the actuation device, linearly in a direction along an axis away from the actuation device to an open position and toward the actuation device to a closed position;a disposable valve body that attaches to the actuation device such that the elongate member is positioned within the disposable valve body;a first element associated with the disposable valve body attached to the fluid source; anda second element associated with the disposable valve body in which the fluid flows from the fluid source into the disposable valve body through the first element and out of the disposable valve body through the second element when the elongate member is in the open position and in which removing the disposable valve body allows access to the elongate member such that the elongate member can be cleaned; the disposable valve body comprising: a hollow portion; a connecting channel connected to the hollow portion and comprising a first diameter, the first diameter being constant; a second channel, connected at one end to the connecting channel and open at a second end, and comprising a diameter that expands from the first diameter to a second diameter, the second diameter being constant, and narrows from the second diameter to a third diameter, the third diameter being constant, such that the plug portion forms an interference fit with the connecting channel when the elongate member is in the closed position, the connecting channel being narrower than both the hollow portion and the second channel. 15. A method for controlling a flow of fluid through a valve, the method comprising: receiving the fluid from a fluid source within a valve body of the valve; andmoving an elongate member, comprising a plug portion and positioned within the valve body, away from an actuator device to an open position and toward the actuator device to a closed position, the actuation device associated with the elongate member such that the actuation device, via the elongate member, controls the flow of the fluid out of the valve body; attaching the valve body to the actuation device such that the elongate member associated with the actuation device is positioned within the valve body, the valve body comprising: a hollow portion; a connecting channel connected to the hollow portion and comprising a first diameter, the first diameter being constant; a second channel, connected at one end to the connecting channel and open at a second end, and comprising a diameter that expands from the first diameter to a second diameter, the second diameter being constant, and narrows from the second diameter to a third diameter, the third diameter being constant, such that the plug portion forms an interference fit with the connecting channel when the elongate member is in the closed position, the connecting channel being narrower than both the hollow portion and the second channel. 16. The method of claim 15, wherein moving the elongate member between the open position and the closed position comprises: moving the elongate member into the open position using the actuation device to allow the fluid flowing into the valve body through a first element associated with the valve body to flow out of the valve body through a second element associated with the valve body. 17. The method of claim 15, wherein moving the elongate member between the open position and the closed position comprises: moving the elongate member into the closed position using the actuation device to stop the fluid flowing into the valve body through a first element associated with the valve body from flowing out of the valve body through a second element associated with the valve body. 18. The method of claim 17, wherein moving the elongate member into the closed position using the actuation device to stop the fluid flowing into the valve body through the first element associated with the valve body from flowing out of the valve body through the second element associated with the valve body comprises: moving the elongate member in a direction towards the actuation device to move the elongate member into the closed position, wherein moving the elongate member in the direction towards the actuation device creates a negative pressure within the second element that stops the fluid from flowing out of the second element. 19. The method of claim 15 further comprising: removing the valve body from the actuation device to allow access to the elongate member; andattaching a different valve body to the actuation device. 20. The method of claim 15 further comprising: attaching the valve body to a nozzle using a number of fluid transfer elements in which the nozzle is used to dispense the fluid onto a surface. 21. The method of claim 15 further comprising: dispensing the fluid through a nozzle associated with the valve body onto a surface, wherein the nozzle is formed by at least a portion of the valve body. 22. A method for dispensing fluid onto a surface, the method comprising: attaching a valve body to an actuation device;positioning an elongate member comprising a plug portion and associated with the actuation device within the valve body, the valve body comprising: a hollow portion;a connecting channel connected to the hollow portion and comprising a first diameter, the first diameter being constant;a second channel, connected at one end to the connecting channel and open at a second end, and comprising a diameter that expands from the first diameter to a second diameter, the second diameter being constant, and narrows from the second diameter to a third diameter, the third diameter being constant, such that the plug portion forms an interference fit with the connecting channel when the elongate member is in a closed position the connecting channel being narrower than both the hollow portion and the second channel;attaching a fluid source to a first element associated with the valve body;receiving the fluid from the fluid source within the valve body through the first element;moving the elongate member away from the actuation device into an open position allowing the fluid flowing into the valve body through the first element to flow out of the valve body through a second element;dispensing the fluid through a nozzle associated with the valve body onto the surface, in which the nozzle is formed by at least a portion of the second element associated with the valve body;moving the elongate member toward the actuation device into the closed position and stopping the fluid flowing into the valve body through the first element from flowing out of the valve body through the second channel;removing the valve body from the actuation device to allow access to the elongate member; andattaching a different valve body to the actuation device.