IEC 61518 pdf download Mating dimensions between differential pressure (type) measuring instruments and flanged-on shut-off devices up to 413 bar (41,3 MPa) Scope This International Standard is applicable to differential pressure (type) measuring instruments(instrument) with a shut-off device (manifold) directly bolted on to them. This standard specifies mating dimensions and tolerances，threads, bolts,and gaskets for amaximum allowable working pressure of 41,3...