An orifice valve plate is a metal disk with a concentric hole in it, which, when inserted in a pipe, restricts fluid flow and reduces pressure. Orifice valve plates are vital in industries that handle liquid and gaseous products as they form the basis of fluid flow measurement in orifice flow meters.

An orifice valve plate is described for use in an electromagnetic fuel injector of the type used to discharge fuel into the combustion chambers of an internal combustion engine. The orifice valve plate is of circular configuration with an upstream surface and an opposed downstream surface and with a central axis. The axis of each orifice passage is inclined downward at an angle to the central axis and extends radially inward from the upstream to the downstream ends of the orifice passage so that each orifice passage will direct a stream of fuel downstream toward the central axis whereby the streams from orifice passages will thus at least partly impinge upon each other so as to produce a total combined fuel spray pattern.

Its advantage is that the throttle part does not need to be calibrated, and the measurement is accurate. Simple structure, compact, small size, light weight. A wide range of applications, including all single-phase fluids and some multiphase flows. Orifice valve plates of different apertures can be continuously replaced with the change of flow rate, and can be checked and replaced online.