Valve pin insert, for fitting into a valve plate at a vacuum chemical power pump, is of a corrosion-resistant plastics to fit into the valve plate to last the life of the pump

摘要

The valve pin insert (10) has a valve body in a shaft structure of different diameters, with a cut-back shoulder between the shaft sections. The shoulder forms a tooth which bites into the material of the valve plate (12) when inserted into an opening (14) in the plate.