Abstract: A suspension system for motor vehicles of the type designed to maintain automatically the horizontal attitude of a motor vehicle with variations in loads on the front suspensions and on the rear suspensions comprises two hydraulic cylinders interposed between the springs of the rear suspensions and the suspended masses in correspondence with the rear axle of the motor vehicle. Each hydraulic cylinder incorporates a distribution valve comprising a slide valve subject at one of its ends to the pressure within the hydraulic cylinder and its opposite end to the pressure transmitted by a hydraulic pump by means of a control valve which is responsive to the subsidence of the front suspensions.

Abstract: An irrigation system of the type comprising a plurality of nozzles spaced along a pipeline fed at one end from a source of supply of irrigation liquid, which latter may be purely water or may be water with additives, in which in order to avoid different spray rates due to a loss in pressure along the pipeline each nozzle is provided with a valve and an associated resilient subsidiary reservoir, the valves operating to close off the nozzles while all the subsidiary reservoirs charge up to the line pressure and then, when a control valve diverts the source of supply to a discharge outlet all the nozzles receive liquid in the same pressure from their associated subsidiary reservoir; when the subsidiary reservoirs are all back at atmospheric pressure the cycle recommences.