Pressure sensing apparatus

Abstract From the Canadian patent

This invention discloses an apparatus for sensing the pressure of a liquid comprising means defining a first chamber having an inlet and an outlet for liquid flowing through said first chamber, said means defining a first chamber including a rigid wall having a first opening therethrough an impermeable, flexible diaphragm sealably covering said opening said diaphragm, including a corrugated portion formed symmetrically about a center portion of said diaphragm, said diaphragm forming means for moving in either direction without stretch or friction so that equal pressures result on opposite sides thereof means defining a, second chamber sealed around said diaphragm on the other side of said …