Product Overview
Cox flow straighteners are the AN and 150# flange conditioning assemblies that let a turbine meter recover its accuracy where the piping cannot give it enough straight run. The upstream unit (1/2 in. and up) intercepts the stream with a six-vane element that strips swirl and re-develops an even flow profile before the fluid reaches the rotor — with little of the head loss a denser conditioner adds — while the downstream unit controls any exit swirl. Both are 300-series stainless: an upstream straightener (10 pipe diameters long) carries a standard pressure port, a downstream straightener (5 diameters) a standard RTD temperature port, with an optional second pressure port on the downstream version. Order a single side or a matched set, in AN flare 3/8 to 2 in. or 150# flange 1/2 to 2-1/2 in. They are sized to the single-rotor Cox CPT and LoFlo, which depend on the conditioned profile; the self-cancelling dual-rotor Exact usually needs none, though a set is still ordered for its bearing-diagnostics check.
Key Features & Benefits
- Six-vane straightening element — the upstream unit squares the profile with a low-restriction vane pack, so it conditions the flow without the head loss of denser conditioners
- Recovers accuracy in short runs — squares up swirl and a lopsided profile off elbows, pumps and valves so a single-rotor turbine reads true where straight pipe is limited
- AN or 150# flange connections — 300-series stainless, with a 37° MS flare or raised-face flange to match the meter and the line
- Upstream, downstream or matched sets — order the side you need or a matched pair; upstream carries a pressure port, downstream an RTD temperature port
- Optional downstream pressure tap — the dual-port downstream straightener adds a local pressure measurement beside the standard temperature port
- Sized to the single-rotor meters — matched to the CPT and LoFlo bore; the dual-rotor Exact self-cancels swirl and rarely needs one
Specifications
- Function
- Reduce or eliminate flow swirl from pipe bends, pumps and valves ahead of a turbine meter. The upstream straightener (1/2 in. and up) carries a six-vane straightening element that develops a symmetrical velocity profile at lower pressure drop than other conditioning methods; the downstream straightener controls exit swirl. 300-series stainless construction
- Connections
- AN (37° MS flare) or 150# raised-face flange
- Configurations
- Single upstream (1 pressure port), single downstream (1 temperature port), downstream with a 2nd pressure port, or a matched upstream + downstream set
- Sizes
- AN flare 3/8–2 in. (3/8 in. for the LoFlo only); 150# flange 1/2–2-1/2 in.
- Pressure rating
- AN flared: MAWP up to 3000 psig at 100°F (3/8–3/4 in.), decreasing with size to 2200 psig at 2 in. (per ASME B31.3, 316 SS, 20,000 psi allowable stress); flanged: per ANSI / ASME B16.5 (150# RF)
- Pressure-port option
- Pressure port standard on the upstream straightener; temperature (RTD) port standard on the downstream — for measuring process pressure and temperature alongside the meter. A 2nd, pressure port on the downstream straightener is optional
- Meter compatibility
- Cox single-rotor meters (CPT and LoFlo), where straight run is short. The dual-rotor Exact cancels swirl itself; a set is ordered for it mainly to enable the bearing-diagnostics check
Common Applications
- Piping systems with inadequate straight runs of pipe
- Test benches and flow-calibration stands
- Custody transfer
- Process conditioning downstream of elbows, pumps and valves
- Bearing diagnostics on dual-rotor (Exact) meters
- Service where a local pressure or temperature tap is wanted at the meter
To size & select the right Flow Straighteners:
Use the input form to tell us your Cox meter and size, the line connection (AN flare or 150# flange) and how much straight run you have, and we’ll spec the upstream, downstream or matched-set straightener — with the pressure or temperature ports your install needs.
Flow Meter Application Sheet ›Talk to an engineer directly — Scott Prater, Principal · 917-580-0878 · scott@pratertechnical.com
Specifications compiled by Prater Technical Partners from Badger Meter Cox precision turbine product literature.