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Title: Agriculture chemical spray valve
Claims: Having described the invention with sufficient clarity to enable those familiar with the art to construct and use it, we claim: 1. An improved agriculture chemical spray valve having a vane rotatable on a shaft to an open position directing a fluid from an inlet of the valve to a main outlet of the valve, and to a closed position directing the fluid to an auxiliary outlet of the valve which connects with a recirculating line, wherein the improvement comprises: the inlet being larger in diameter than the auxiliary outlet; a stem extending from the shaft at right angles to the vane, toward the auxiliary outlet when the valve is in the open position, and toward the inlet when the valve is in the closed position; and a disc mounted on the end of the stem sized to cover the auxiliary outlet when the valve is in the open position but allows the fluid to flow around the disc in the larger inlet when the valve is in the closed position directing the fluid to the auxiliary outlet and the recirculating line. 2. An improved agriculture chemical spray valve as recited in claim 1, wherein the valve further comprises: a body and a valve liner insert molding, within the body, enclosing the vane and the disc, having a molded valve seat and having molded openings comprising the inlet, the auxiliary outlet, and the main outlet. 3. An improved agriculture chemical spray valve as recited in claim 1, wherein the vane and the disc are rotatable through an angle of substantially 90 degrees between the open position and the closed position. 4. An improved agriculture chemical spray valve for use in spraying a fluid from an aircraft, the valve having: a body; an inlet to the body; a spray outlet from the body to a spray line; a recirculating outlet from the body; and an aspirator in the recirculating outlet having an aspirator inlet in the spray line for aspirating the fluid from the spray line when the recirculating outlet is in use; wherein the improvement comprises: a valve liner insert, within the body, cylindrical in shape, having a circular recirculating port connecting to the aspirator; a valve seat formed in the insert by an inwardly projecting arcuate rib; a shaft passing diametrically through the valve liner insert and extending outside of the body; a vane attached to and projecting from the shaft, within the valve liner insert, and operable by rotation of the shaft to either an open position which directs the fluid to the spray outlet, or to a closed position, against the valve seat, which directs the fluid to the recirculating port; a stem, attached to and perpendicular to the shaft, within the valve liner insert, located so that when the vane is in the open position the stem extends to the recirculating port and when the vane is in the closed position the stem extends axially along the insert toward the inlet; and a disc on the outer end of the stem having a diameter sufficient to cover the recirculating port and smaller than that of the inlet so that when the vane is in the open position the disc is located in front of the recirculating port, thus blocking the port, and when the vane is in the closed position the disc is centered in the inlet allowing the fluid to flow past. 5. An improved agriculture chemical spray valve as recited in claim 4, further comprising a seal on the vane for sealing the vane against the valve seat when the vane is in the closed position. 6. An improved agriculture chemical spray valve as recited in claim 4, in which the valve liner insert is an abrasion resistant plastic molding. 7. An improved agriculture chemical spray valve as recited in claim 6, in which the valve liner insert is molded in one piece. 8. An improved agriculture chemical spray valve as recited in claim 4, in which a sub-assembly, comprising the disc, the stem, and the vane, all attached to the shaft within the valve liner insert, forms a unit, thus facilitating replacement of parts subject to wear by the fluid and by the rotation of the shaft. 9. An improved agriculture chemical spray valve as recited in claim 8, further comprising a shaft support fastened to the body, having a hole to surround and support the shaft and covering an opening in the body through which the sub-assembly can be installed. 10. An improved agriculture chemical spray valve as recited in claim 9, in which means for sealing are placed between the body and the shaft support and also between the shaft support and the shaft to reduce leakage of the fluid. 11. An improved agriculture chemical spray valve as recited in claim 4, in which the disc has a convex outer surface for facilitating the flow of the fluid when the valve is in the closed position. Other info: Inventors: Jeffries, Jerold R. (Augusta, KS, US) Fickel, H. Glen (Wichita, KS, US) Schifferdecker, Donald E. (Wichita, KS, US) Application Number: 840597 Filing Date: 1977-10-11 Publication_date: 1979-05-29 Assignee: The Cessna Aircraft Company (Wichita, KS) Primary Class(es): 137/625.46 137/875, 137/876 Other Classes: US Patent Ref:
Other Refs: Primary Examiner: Rosenthal, Arnold Assistant Examiner: Attorney: Brown, Jr.; Edward L. |
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