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Reduction valves are widely used in industry. Increasing requirements for accuracy of pressure adjustment in industrial hydraulic or pneumatic systems, as well as automation with maximum autonomy of these operations require the implementation of new design solutions. Aim: The aim of the research is to test the methods of analysis and synthesis of mechanical systems based on the modification of their models presented in the form of kinematic graphs, for example, the development of a new design of pressure reducing valve with extended functionality. Materials and Methods: The pressure reducing valve RD-120 is considered as the basic device. To achieve research aim, the method of analysis and synthesis of mechanical systems based on the modification of their models presented in the form of kinematic graphs is applied. Taking into account of multivariance of solutions during the synthesis of a device based on modified kinematic graphs, it was suggested to search for the optimal solution by calculating the energy of the kinematic graph. Results: A fundamentally new device was synthesized in the form of a passive controlled pressure reducing valve. It was found that the model in the form of a modified kinematic graph that defines a certain device as a device with mechanically variable characteristics must have at least three cycles, two of which determine the main functional interaction of the elements of the device, and the remaining – their modification. The design realization of the synthesized device is presented.

Since the torsion bar represents just an elastic element, the energy dissipation in suspensions problem is highly relevant for its application. Currently in quality of a dissipation device in torsion suspension are used the hydraulic dampers with movable members reciprocating translational motion respectively to the housing or lever-type hydraulic shock absorbers of piston and vane types, with the movable member’s rotational movement respectively to the housing. These dampers are implementing only throttle-valve performance type, associated with these devices’ functional capacities and depending on design constraints. The paper presents a synthesis of innovative lever-blade dampers, whose performance is not related to the value of working chambers inner pressure. Their essential peculiarity relates to the mechanical control loop presence in the structure that determines a close relationship between the performance and the value of the shock absorber movable element displacement relatively to the body. In the process of synthesis carried out tested are the appropriate methods, built on the basis of technical systems’ modeling with modified kinematic graphs. The synthesis results are shown in the form of two structurally implemented samples. Performed is a comparative analysis of the samples with their basic performance determining.