Abstract: The present invention provides an agricultural product delivery system in which a support structure or skid well is configured to rigidly support a primary product storage tank that is manufactured from a non-metallic material such as polyethylene or plastic. The product storage tank can have a capacity of at least 500 gallons, and preferably 1000 gallons, and the support structure can include multiple support ribs spaced along sides of the tank for providing rigid support for the tank and preventing deformation when filled with liquid. In addition, the product storage tank can include one or more contours or cavities for accommodating smaller chemical injection tanks positioned therein. Such chemical injection tanks can also be rigidly supported by the support structure. A spray system can mix liquid from the product storage tank and chemical from a chemical injection tank for spraying a field.

Abstract: A pump has a pump assembly for pumping fluid. The pump assembly includes a fluid pressure changing mechanism in fluid communication with a valve plate which is in fluid communication with a port plate. A pair of flappers are interposed between and sealable with the valve plate and port plate. A head has a head port, and is in sealed engagement with the port plate, so that, in cooperation with the port plate and the valve plate, the flappers control fluid flowing through the head port and to and from the fluid pressure changing mechanism. Rotation of the port plate and valve plate relative to the head reverses flow of the fluid through the head port.

Abstract: An axial piston fluid pumping apparatus is disclosed in which wobble pistons are rigidly connected to arms of a nutating plate that is rotatably mounted on a bearing which is mounted on a drive shaft. The axis of the bearing is at an acute angle to the axis of the shaft. The wobble pistons move within cylinders whose bores are disposed about the axis of the shaft. In one embodiment, the pistons are supported by leaf springs and radially resilient connecting rods and the crankcase is enclosed.

Abstract: An axial piston fluid pumping apparatus is disclosed in which wobble pistons are rigidly connected to arms of a nutating plate that is rotatably mounted on a bearing which is mounted on a drive shaft. The axis of the bearing is at an acute angle to the axis of the shaft. The wobble pistons move within cylinders whose bores are disposed about the axis of the shaft. In one embodiment, the pistons are supported by leaf springs and radially resilient connecting rods and the crankcase is enclosed.