Abstract: A plate valve is presented in which flow losses are reduced and effective flow area is maximized by establishing a ratio of effective seat area (Fs) to area between the plates (Fb) such that Fs/Fb is between 0.4 and 0.8. The spacing between plates is higher compared to the width of the plates than in the prior art, and the width of the plates may decrease for plates of increasing diameter.

Abstract: A feather valve is presented having shock absorbing strips in the guard section to absorb impact loads and dampen vibration of the feather strips.

Abstract: A track type vehicle having pivotable A-frame members and a walking beam structure to permit oscillation of one track relative to the other is equipped with a pair of single acting hydraulic cylinders, each of which is connected between the main frame of the vehicle and one of the track assembly. The cylinders are interconnected by a line having a selector valve. The valve is opened to permit transfer of fluid between the cylinders to permit relative oscillation of the tracks, and the valve is closed to prevent transfer of fluid between cylinders when it is desired to prevent oscillation of the tracks.

Abstract: A rotary compressor assembly constructed to prevent leakage from the compressor housing to atmosphere through the interface between the cylindrical section and the covers of the housing.The compressor is disposed substantially within the tank which receives the compressor discharge and is connected to the wall of the tank. A seal between the compressor and the tank wall seals the tank and thereby prevents leakage from the compressor to atmosphere.