Abstract: A suction and return line reservoir filter that can be used under high negative pressure suction applications is provided with a positive engaging means adapted to hold the bowl against the filter housing even during such high negative differential pressure suction operations. An access cover is provided which includes three equally spaced axial extensions or fingers to force the bowl against the filter housing.

Abstract: A diffuser for use in a liquid circulation system having a tank for holding a body of liquid. The diffuser is connected to the return flow passage and provides an improved delivery of the returning liquid to the tank effectively minimizing turbulent aeration of the liquid therein. The diffuser may comprise a one-piece element having a frustoconical wall portion connected at its narrow end to the return flow passage with the wide end directing the returning liquid into the body of liquid in the tank in a nonturbulent manner. The wide end of the frustoconical wall portion may be provided with a tubular flange for further controlling the delivery of liquid into the tank. The frustoconical wall may be provided with at least one longitudinal slot which may widen inwardly toward the wide end of the frustoconical wall to provide further improved control of the liquid delivery into the tank.

Abstract: A fluid-operated vibrator having improved structure for lubricating the bearings of an eccentric portion thereof. A portion of the pressurized fluid delivered to the drive motor of the vibrator is bypassed through the drive shaft of the motor. After lubricating the bearings, the lubricant fluid is returned to the exhaust fluid line. The bypass passage may effectively define a pressure drop restrictor for improved lubrication of the bearings. The inlet and outlet to the motor may be connected to a conduit structure having an outer exhaust conduit and a supply conduit extending longitudinally within the exhaust conduit.