Abstract: A valve device for use with a drain provided with a pipe having an entrance for collecting liquid leading to a P-trap beneath the entrance. The device comprising an open vessel, in use positioned at the entrance of the pipe, having walls and a floor defining an internal chamber, the floor having an opening for permitting liquid collected in the chamber to pass into the pipe. The device is provided with a valve arranged to seat in the opening from below and is movable between a closed position sealing the opening against gas and liquid flow from the pipe to the chamber and an open position spaced from the opening beneath the floor. A float is positioned in the internal chamber and a linkage transfers buoyancy force exerted on the float by liquid collected in the chamber to the valve to cause the valve to move from the closed position to the open position when the liquid exceeds a certain depth in the chamber.

Abstract: A liquid chemical proportion and application rate controller for agricultural injection type sprayers is connected to a microprocessor and to one or more pumps. Depending upon the chemical being used, a control key is inserted into a monitor which controls the output of the microprocessor to the pump or pumps and automatically controls the rate of application, the dilution proportions, indicates and adapts the output for Metric, Imperial instructions or in combination of both (i.e. liters per acre). Such a key may be provided with the container of chemical and discarded when the spraying is completed.

Abstract: Hinged tables for swathers usually are provided with individual knife sections and the center section of this knife is difficult to drive. This invention eliminates the necessity for a center section drive by using a two section knife on a three section table with each knife section extending through one wing section and part of the center section. The knives are driven from the outer ends and are allowed to flex over the hinge area. The wing sections are provided with rigid guard bars and a flexible section of guard bars secured to the inner end of the rigid guard bar and is secured by the other end to the center of the center section by means of a swivel or sliding connection.