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AVCO
The Segmental Orifice bore is designed for fluids containing heavy sediments. The diameter ”D” is equal to 98% of the line I.D. “H” is the height of the circular segment. The β ratio is equal to the equivalent circular diameter of segment divided by the line I.D. The Segmental Orifice is the most difficult type of...
The purpose of the Restriction Orifice is to reduce the flow rate or to create a pressure drop. The Restriction Orifice plates are placed downstream of a turbine meter to guard against over-spin. A Restriction Orifice is denoted by “RO” or “FO”. When specifying a Restriction Orifice, plate thickness “E”...
AVCO manufactures Orifice Plates from 1/4”-96” in line size. The standard material of construction is 316 stainless steel. Orifice Plates are manufactured in strict accordance to AGA, ISA, ASME, API, and ISO standards. Special custom designs are also available. AVCO has a complete engineering department to assist in product...
This is the standard flow element “FE” type orifi ce plate. The orifice is beveled on the downstream edge, in accordance to AGA report #3. The purpose of the bevel is to reduce the width of the throat to the “e” dimension. The ratio of the orifice bore divided by the line I.D. is called the beta ratio“β...
Instead of beveling the downstream face of the orifice plate at 45°, a Counter Bore is another method of reducing the throat thickness to the “e” dimension. The Counter Bore diameter is equal to the bore plus dimension “A”.
The outside diameter of the bevel of the Eccentric Orifice is tangent to 98% of the line I.D. When set at the top of the line, entrained gases in a liquid will pass the orifice.
The Quadrant Orifice is designed to measure the flow of high viscosity fluids, and is recommended when the Reynolds Number is be low 10,000. Quadrant Orifices maintain a constant coefficient in laminar flow. The radius “R” is a function of the β ratio. The thickness of the orifice is equal to quadrant radius “R”....
