Cox Flow Straighteners

Cox Flow Straighteners offer a simple method of reducing or eliminating flow swirl, as a result of pipe bends and the location of valves, thermowells or pressure taps naturally found in piping systems.
The six vane straightening element, within the upstream straightener (sizes 1/2″ and up), produces less pressure drop, compared to other flow conditioning methods. Two different options, flared or flanged connections, allow for a quick and easy installation. Collaboratively, the upstream and downstream flow straighteners prevent false readings from fluid swirl effects  inherent in process piping systems. Flow meter performance is vastly improved.



Cox Flow Straighteners are attached both upstream and downstream of the flow meter and are designed to reduce or eliminate fluid swirl caused by pumps, piping bends, vibrations, valves and other related process variables within a piping system.

As fluid enters the upstream straightener, fluid is first intercepted by a six bladed straightening vane (sizes 1/2″ and up) to remove swirl and develop a symmetrical flow profile, prior to impelling  the rotor. After passing though the meter, the fluid enters into the downstream straightener to control any exiting swirl influence on the rotor. The downstream straightener has an optional pressure port, in conjunction with the RTD tap, for measuring process pressures along with temperature.

Pressure Ratings:

Flared Models: 3000 psi
Flanged Models: In accordance with ANSI standards


For flared models, flow straighteners consist of a straight section of tubing with 37° (AN) flared fittings, nuts and sleeves made of 300 series stainless steel.
Similarly, flanged models also consist of 300 stainless steel, required to achieve the desired pressure rating or compatibility with the fluids.
Pressure ports come standard on upstream straighteners, while a temperature port is standard on downstream straighteners. Stainless steel caps are provided, in the event the ports are not used. The downstream flow straightener can be ordered with an additional port for pressure.


Flow straighteners are used in piping systems where flow meters are present, such as:

Systems with inadequate straight runs of piping 
Test benches or calibration stands 
Custody transfer 
Process conditioning
Bearing diagnostics (dual rotor meters)