Pressure difference measuring apparatus

摘要

A pressure differential measuring apparatus comprising a cylindrical member having a first portion and a second portion of reduced diameter relative to the first portion. The first portion is provided with an outwardly extending member, while the second portion serves as a control rod. The instrument is further provided with a resilient bendable tubular member which surrounds the second portion and is connected to the outwardly extending member of the first portion by a circular electron-beam-welded seam.