Black Reducing Tees
A black reducing tee is a malleable cast iron tee with female-threaded ends of different sizes, used to take a branch of a different size from the main line. It combines the job of a tee and a reducer in one body.
It provides the shortest connection when branching from a riser to an apartment, from a manifold to an appliance and from the main line to a measuring point. The store stocks more than 35 size combinations for main line sizes from 1/2″ to 3″.
Main Applications
- Floor and apartment branches from risers
- Small-bore appliance outlets from manifolds
- Pressure gauge, thermometer and air vent tappings from the main line
- Appliance branches in gas distribution (in projects compliant with regulations)
- Machine outlets from compressed air mains
- Pump by-pass and drain lines
Technical Data
| Fitting type | Reducing tee |
|---|---|
| Product standard | TS EN 10242, design symbol A (manufacturer information) |
| Material | Blackheart malleable cast iron B 350-10 (sales sheet information) |
| Surface | Black, without galvanized coating |
| Thread | ISO 7-1 Rp parallel female thread on all three ends |
| Main line size | 1/2″ – 3″ (product range) |
| Example sizes | 3/4″ × 1/2″ × 1/2″, 1″ × 1/2″ × 1″, 2″ × 1″ × 2″, 3″ × 2″ × 3″ (product range) |
| Size combinations | More than 35 (product range) |
| Permissible pressure | 25 bar, −20 … +120 °C (EN 10242, design A) |
| Pressure at high temperature | 20 bar, up to +300 °C (EN 10242, design A) |
| Leak test | At least 5 bar air or 20 bar water (sales sheet information) |
| Equal-size branch | With a black tee |
Material Options
| Part | Black malleable iron | Galvanized malleable iron | Stainless steel casting |
|---|---|---|---|
| Body | Blackheart malleable cast iron B 350-10 | Malleable iron EN-GJMB-350-10, hot-dip galvanized | Investment casting 1.4408 (AISI 316 equivalent), depending on model |
| Surface | Black, uncoated | Zinc coated | Stainless, uncoated |
| Thread | ISO 7-1 Rp female thread | ISO 7-1 Rp female thread | Depending on model |
| Pressure rating | 25 bar −20…120 °C, 20 bar 300 °C (EN 10242) | 25 bar −20…120 °C (EN 10242) | Depending on model |
| Suitable media | Closed heating water, gas, compressed air | Drinking and domestic water, fire water | Corrosive media and media requiring hygiene |
Which material? In heating risers and gas distribution a black reducing tee is the same material as the pipe; galvanized reducing tees are preferred for drinking water branches.
Advantages
Tee and Reducer in One Piece
- No extra reducer or nipple needed
- Shorter connection length
Wide Combination
- More than 35 main line / branch sizes
Fewer Sealing Points
- Every extra fitting is another threaded joint; a reducing tee reduces them
Heat Resistance
- Rated 20 bar at +300 °C
Construction and Design Features
- Main line ends and branch end in different sizes
- Size order: run × branch × run (e.g. 2″ × 1″ × 2″)
- One-piece cast body
- TS EN 10242 design A
Send the sizes of the three ends in order (run × branch × run) and the quantity; we will confirm the size in stock right away.
How to Choose?
- Measure the main line sizeThe two straight-through ends are chosen by the main pipe size.
- Determine the branch sizeMeasure the thread size of the outlet line or the connected appliance.
- State the size correctlyGive the size in the order run × branch × run when ordering.
- Check pressure and temperatureIf the branch temperature exceeds 120 °C, use the 20 bar limit.
Complementary Products
Why ORFA?
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Details →Get a quote for your project
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