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Abstract
The effect of a difference in the form of a poppet top on the performance of an oil hydraulic poppet valve is investigated experimentally. The flow characteristics, thrust performance, noise level and cavitation limit are researched on the three different shaped poppet valves: type (A) the conical poppet, type (B) the conical with a flat part on the top, and type (C) the cylindrical form. It is made clear that the flatness on the top of a poppet in type (B) has a great effect on the valve performance in the case of converging flow, and a difference in a seat angle in type (C) makes a great change in cavitation condition, flow characteristics and noise level in the case of diverging flow.
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