Orifice fitting

摘要

An orifice fitting for measuring fluid flow therethrough which can be used for either single or dual chamber fittings. The orifice fitting includes a plate carrier having an orifice plate receivable in the plate carrier. The orifice plate has a single preferred fluid flow direction. A double circular shoulder in the plate carrier includes a first shoulder and a concentric second shoulder having a larger diameter than the first shoulder. The double shoulder mates with a circular recess on the orifice plate to properly orient the plate for the preferred fluid flow direction.