Jacoby Tarbox — Sight Flow Indicators
90° Flanged Sight Flow Indicators — Model 90-LR
90° Long Radius Angle-Cast · ANSI 150# & 300# Flanged · Single & Dual Window
The Jacoby-Tarbox Model 90-LR is a 90° angle-cast flanged sight flow indicator with a long-radius body. The 90° body turns the flow path 90 degrees within the casting, positioning the viewing port perpendicular to the inlet pipe — eliminating a separate elbow fitting and reducing the total number of flanges and potential leak points. The face-to-face dimension matches a Class 150 or Class 300 long-radius elbow. Available in ANSI 150# (model code TQZ-) and ANSI 300# (TRZ-), with dual window versions (TQX- / TRX-) for hazardous service.
Available Models
Model 90-LR — 90° Long Radius Flanged (ANSI 150#)
The Jacoby-Tarbox 90-LR is a 90° angle-cast flanged sight flow indicator with long-radius body geometry. The 90° body turns the flow path 90 degrees, positioning the viewing port perpendicular to the inlet pipe — eliminating a separate elbow fitting and reducing the total number of flanges and potential leak points. The long-radius cast body provides a smooth, low-turbulence flow path. Flanged connections per ANSI B16.5 Class 150. The face-to-face dimension matches a Class 150 long-radius elbow.
Sizes
1/2" – 4" (ANSI 150# flanges)
Pressure
Full ANSI B16.5 Class 150 rating
Temperature
Up to 500°F (material dependent)
Body
Carbon Steel (A216 WCB) standard; 316 SS, Alloy 20 available
Glass
Tempered borosilicate glass
Indicator
Viewing only standard; optional flapper or rotary
Model 90-LR-300 — 90° Long Radius Flanged (ANSI 300#)
Higher-pressure version of the 90-LR with ANSI Class 300 flanged connections. Provides the same 90° angle-pattern installation advantages at elevated pressure ratings. Suitable for steam, high-pressure process lines, and applications where Class 150 ratings are insufficient.
Sizes
1/2" – 4" (ANSI 300# flanges)
Pressure
Full ANSI B16.5 Class 300 rating
Temperature
Up to 500°F (material dependent)
Body
Carbon Steel (A216 WCB) standard; 316 SS, Alloy 20 available
Glass
Tempered borosilicate glass
Indicator
Viewing only standard; optional flapper or rotary
Model 90-LR-DW — Dual Window (ANSI 150#)
Dual window version of the 90-LR. The dual window design provides an additional safety barrier — if the primary glass is compromised, the secondary window maintains process containment. Recommended for hazardous, toxic, or high-value process streams.
Sizes
1/2" – 4" (ANSI 150# flanges)
Pressure
Full ANSI B16.5 Class 150 rating
Temperature
Up to 500°F (material dependent)
Body
Carbon Steel (A216 WCB) standard; 316 SS available
Glass
Dual tempered borosilicate glass
Indicator
Viewing only standard; optional flapper
Model 90-LR-300-DW — Dual Window (ANSI 300#)
Dual window version of the 90-LR-300 for high-pressure hazardous service. Combines the Class 300 pressure rating with the added safety of dual window construction.
Sizes
1/2" – 4" (ANSI 300# flanges)
Pressure
Full ANSI B16.5 Class 300 rating
Temperature
Up to 500°F (material dependent)
Body
Carbon Steel (A216 WCB) standard; 316 SS available
Glass
Dual tempered borosilicate glass
Indicator
Viewing only standard; optional flapper
ANSI 150# — Models TQZ- / TQX-
Standard pressure class. Full ANSI B16.5 Class 150 pressure-temperature rating. TQZ- is single window; TQX- is dual window. Most common selection for general process service.
ANSI 300# — Models TRZ- / TRX-
Higher pressure class. Full ANSI B16.5 Class 300 pressure-temperature rating. TRZ- is single window; TRX- is dual window. Specified for steam, high-pressure process lines, and applications where Class 150 is insufficient.
Installation Advantages of the 90° Angle Pattern
No Elbow Required
The 90° body replaces a separate elbow fitting, reducing total installed cost and potential leak points.
Operator-Facing View Port
Viewing port faces the operator regardless of pipe orientation — no awkward viewing angles.
Tight-Space Installations
Ideal when the pipeline runs parallel to a wall, panel, or structural member with no room for a straight-through unit.
Top-Down Viewing
On horizontal pipelines, the 90° pattern allows viewing from above — useful for overhead or elevated piping.
Lower Pressure Drop (LR)
Long-radius models provide a smoother flow path, reducing turbulence and pressure drop versus a standard 90° elbow.
Viscous & Slurry Service
Long-radius body minimizes flow disturbance — preferred for viscous fluids, slurries, and particulate-laden streams.
Materials of Construction
Body Materials
| Material | Avail. |
|---|---|
| Carbon Steel (A216 WCB)— Standard; NACE MR-01-75 compliant | ✓ |
| 316 Stainless Steel— Available on all models | Option |
| Alloy 20— Consult factory | Option |
| Hastelloy C— Consult factory | Option |
| Monel— Consult factory | Option |
Seal / Gasket Materials
| Material | Avail. |
|---|---|
| Standard Gasket— Standard on all models | ✓ |
| PTFE (Teflon)— Available on all models | Option |
| PFA Lined— Consult factory for lined models | Option |
All wetted components meet NACE MR-01-75 / ISO 15156-1 requirements. Flanges drilled per ANSI B16.5. All units hydrotested at 1-1/2 times rated pressure prior to shipment.
Specifications
| Parameter | Value |
|---|---|
| Body Pattern | 90° long-radius angle (inlet and outlet at right angles) |
| Connection Types | ANSI 150# flanged (standard) or ANSI 300# flanged (-300 suffix) |
| Size Range | 1/2" – 4" ANSI flanged |
| Pressure Rating | Full ANSI B16.5 Class 150 or Class 300 per material |
| Temperature | Up to 500°F (material dependent) |
| Body Materials | Carbon Steel (A216 WCB) standard; 316 SS, Alloy 20, Hastelloy, Monel available |
| Viewing Glass | Tempered borosilicate glass |
| Dual Window Option | Available on all models (-DW suffix); secondary glass for added safety |
| Flow Indication | Viewing only standard; optional flapper or rotary indicator |
| Flange Drilling | ANSI B16.5 raised face standard; flat face available |
| Face-to-Face | Matches Class 150 or Class 300 long-radius elbow take-out dimension |
| Wetted Components | Meet NACE MR-01-75 / ISO 15156-1 requirements |
| Testing | All units hydrotested at 1-1/2 times rated pressure prior to shipment |
| Lighting Option | Phaeton LED sight light factory-mountable |
How to Order — Model Code
Specify pressure class, window type, size, body material, and optional indicator. Example: TQZ-2-SS-F = ANSI 150# single window, 2" flanged, 316 SS body, flapper indicator.
| Pos. | Field | Options |
|---|---|---|
| T | Prefix | T = Jacoby-Tarbox flanged sight flow indicator |
| Q/R | Pressure Class | Q = ANSI 150# · R = ANSI 300# |
| Z/X | Window Type | Z = Single window · X = Dual window |
| - | Size | Nominal pipe size (1/2 · 3/4 · 1 · 1-1/2 · 2 · 3 · 4) |
| Suffix | Body Material | Omit = Carbon Steel · SS = 316 Stainless Steel · A20 = Alloy 20 |
| Suffix | Indicator (optional) | F = Flapper · R = Rotary · omit for viewing only |
| Suffix | Lining (optional) | PFA = PFA lined · omit if not required |
Contact Northeast Controls for special alloys, non-standard flange drillings, flat face flanges, or service conditions requiring factory review.
Typical Applications
Cooling Water Systems
Confirm flow in heat exchanger and cooling tower circuits where piping runs along walls or panels.
Chemical Processing
Monitor corrosive or viscous chemical streams; 316 SS and Alloy 20 bodies for aggressive media.
Steam Condensate
Verify condensate return flow in tight mechanical rooms where straight-through units cannot be oriented correctly.
Lubrication Systems
Confirm lube oil flow to bearings and rotating equipment; long-radius models for viscous oils.
Pump Discharge Monitoring
Install at pump discharge where piping changes direction — the 90° body serves as both indicator and elbow.
Hydraulic & Pneumatic Lines
Compact angle-pattern design fits in confined hydraulic and pneumatic panel installations.
Jacoby Tarbox 90-LR 90° flanged sight flow indicator sales
Contact us for model selection, materials, sizing, and installation guidance.
Quick RFQ
Request Pricing