Abstract
A poppet valve is used solely as a check valve and also included as a pilot part in various kinds of control valves in oil hydraulic circuits; therefore, it is very important to clarify its characteristics.
The purpose of this paper is to search the behavior during tens ms when it responds to a quick flow change. In this research, a check valve is used as one of the examples of poppet valves. The composition where an oil hammer influences the valve is treated as one of examples of a quick change in pressure and flow velocity. The composition is an important part of the intensifier using an oil hammer which the authors have been developing and also the result will provide fundamental data to clarify the dynamic characteristics of a hydraulic system with a poppet valve.
The transient phenomena are researched by experiments and simulations. For the analysis by simulation, fundamental equations concerning a check valve and those by the characteristics method concerning a pipeline are presented. They are solved simultaneously using the Runge-Kutta methods. The effects of the spring, mass of the poppet, and volume and length at the connective parts on a peak generated pressure is clarified.
