AN EXPERIMENTAL STUDY ON THE SEVERAL POPPET VALVES WITH DIFFERENCE IN SHAPE

Abstract

Effects of difference in the poppet shape on the characteristics of oil hydraulic poppet valves are studied, under in particular the flow conditions with cavitation. The flow rate and thrust characteristics, noise level and cavitation occurrence limit are measured with the five different shaped poppet valves: type (A) the normal cone, type (B) with a plane on the top, type (C) the cylindrical, types (D) and (E) with a flange around the skirt and the top of the poppet.
As a result, it is mainly revealed that the plane placed on the top of type (B) has a great effect in the case of the converged flow application, the difference of the seat angle of type (C) makes great changes in the valve characteristics in the diverged flow, and the flanges in types (D) and (E) have a effect on the compensation of flow force or changing the direction of the flow force.