Energy Flow Systems Orifice plates are manufactured in accordance with A.G.A., A.S.M.E. and ISA recommendations Energy Flow Systems orifice plates are available In the paddle handle type to be use with raised face orifice flange unions. Standard materials of construction are 304 or 316 SS with other materials such as Monel and Hastelloy C or D available as required. Energy Flow Systems orifice plates may be supplied with concentric, eccentric, segmental or quadrant edge bores as required