Abstract: A telescopic hydraulic shock absorber in which a valve for controlling downward flow through the piston is formed by a spring disc valve sealing against a seat on the underside of the piston, and a valve for controlling upward flow through the piston is formed by a spring disc valve located between the piston and the first-mentioned disc valve. Apertures are formed in the first-mentioned disc valve to permit the upward flow, and the second disc valve seals these apertures when closed. A single set of passages through the piston is provided to accommodate both upward and downward flows.

Abstract: A hydro-pneumatic suspension strut for use in a self-levelling vehicle suspension system. The strut is similar in construction to a pressurized two-tube shock absorber, having a working cylinder in which a piston having damping valves is slidable, and an annular oil reservoir communicating with one end of and surrounding the working cylinder. The reservoir contains two flexible sacs, one of which contains gas for pressurizing the strut and providing suspension resilience, while the other is provided with an inlet for connection to the vehicle suspension system, so that it can be inflated to cope with increased loads.