Single Sphere Rubber Expansion Joint
One rubber arch between two flanges. Absorbs pump vibration, pipe movement and small misalignment. Standard sizes DN32–DN1000, larger up to DN3200.
- Size Range: DN32–DN3200 (1¼"–128")
- Pressure: PN10 / PN16 / PN25
- Rubber: EPDM / NBR / NR / CR / IIR
- Flange: Carbon steel, SS304, SS316L
- Drilling: EN 1092-1, ASME B16.5, JIS, GB
- Options: Control rods, vacuum ring, PTFE lining
Single Sphere Rubber Expansion Joint Dimensions
Standard sizes DN32 to DN1000. All dimensions in mm. Bolt data shown to GB/T 9115; EN, ASME and JIS drilling on request.
| DN | Inch | Length L | Bolts | Bolt hole Ø | Bolt circle | Axial movement | Lateral | Angular | |
|---|---|---|---|---|---|---|---|---|---|
| Extension | Compression | ||||||||
| 32 | 1¼" | 95 | 4 | 18 | 100 | 6 | 9 | 9 | 15° |
| 40 | 1½" | 95 | 4 | 18 | 110 | 6 | 10 | 9 | 15° |
| 50 | 2" | 105 | 4 | 18 | 125 | 7 | 10 | 10 | 15° |
| 65 | 2½" | 115 | 4 | 18 | 145 | 7 | 13 | 11 | 15° |
| 80 | 3" | 135 | 4 | 18 | 160 | 8 | 15 | 12 | 15° |
| 100 | 4" | 150 | 8 | 18 | 180 | 10 | 19 | 13 | 15° |
| 125 | 5" | 165 | 8 | 18 | 210 | 12 | 19 | 13 | 15° |
| 150 | 6" | 180–200 | 8 | 23 | 240 | 12 | 20 | 14 | 15° |
| 175 | 7" | 200 | 8 | 23 | 240 | 12 | 20 | 14 | 15° |
| 200 | 8" | 210–250 | 8 | 23 | 295 | 12 | 25 | 22 | 15° |
| 225 | 9" | 200 | 8 | 23 | 295 | 16 | 25 | 22 | 15° |
| 250 | 10" | 230 | 12 | 23 | 350 | 16 | 25 | 22 | 15° |
| 300 | 12" | 245 | 12 | 23 | 400 | 16 | 25 | 22 | 15° |
| 350 | 14" | 255 | 16 | 23 | 460 | 16 | 25 | 22 | 15° |
| 400 | 16" | 255 | 16 | 25 | 515 | 16 | 25 | 22 | 15° |
| 450 | 18" | 255 | 20 | 25 | 565 | 16 | 25 | 22 | 15° |
| 500 | 20" | 255 | 20 | 25 | 620 | 16 | 25 | 22 | 15° |
| 600 | 24" | 260 | 20 | 30 | 725 | 16 | 25 | 22 | 15° |
| 700 | 28" | 260 | 24 | 30 | 840 | 16 | 25 | 22 | 15° |
| 800 | 32" | 260 | 24 | 34 | 950 | 16 | 25 | 22 | 15° |
| 900 | 36" | 260 | 28 | 34 | 1050 | 16 | 25 | 22 | 15° |
| 1000 | 40" | 260 | 28 | 34 | 1160 | 18 | 26 | 24 | 15° |
| DN1200 – DN3200 (48"–128") → Large Diameter Rubber Expansion Joint | |||||||||
Face-to-face length can be changed to fit an existing gap. Sizes outside this table are made to drawing.
How It’s Built
Five parts, each one you can specify.
- 1. Outer rubber — IIR, CR, EPDM, NR or NBR. Resists weather, ozone and wear.
- 2. Inner rubber — Same compound family, chosen for your medium.
- 3. Polyester cord fabric — Carries the pressure and holds the arch shape.
- 4. Flange — Q235 carbon steel, SS304 or SS316L. Rotates freely for easy bolt alignment
- 5. Steel wire ring — Locks the rubber bead into the flange so it cannot pull out.
Choose the Rubber by Medium and Temperature
The rubber decides what the joint can carry. Pick it by the hottest temperature in your line, then check the medium below.
Service temperature
Dark bars: continuous rating of the finished joint. Light bars: limit of the compound itself, short periods only.
How the compounds compare
| Property | NR | NBR | CR | IIR | EPDM | CSM | FKM |
|---|---|---|---|---|---|---|---|
| Best for | Cold water, abrasive slurry | Oil, fuel, oily water | Seawater, outdoor lines | Acids, gas, vacuum | Water, hot water, outdoor | Oxidising chemicals, outdoor | Hot oil, solvents, strong acids |
| Mechanical | |||||||
| Tensile strength | Excellent | Good | Good | Fair | Good | Good | Good |
| Tear resistance | Excellent | Good | Good | Good | Fair | Good | Fair |
| Abrasion resistance | Excellent | Good | Good | Fair | Good | Good | Good |
| Flex life (movement) | Excellent | Good | Good | Good | Good | Good | Fair |
| Environment | |||||||
| Heat ageing | Fair | Good | Good | Excellent | Excellent | Excellent | Excellent |
| Ozone and sunlight | Poor | Poor | Good | Excellent | Excellent | Excellent | Excellent |
| Gas tightness / vacuum | Good | Good | Good | Excellent | Good | Good | Excellent |
| Water and hot water | Good | Good | Good | Excellent | Excellent | Good | Fair |
| Media | |||||||
| Mineral oil | Poor | Excellent | Good | Poor | Poor | Good | Excellent |
| Fuel, gasoline | Poor | Good | Fair | Poor | Poor | Fair | Excellent |
| Aromatics (benzene) | Poor | Poor | Poor | Poor | Poor | Fair | Excellent |
| Strong acids | Fair | Fair | Good | Good | Good | Good | Excellent |
| Weak acids | Good | Good | Excellent | Excellent | Excellent | Excellent | Excellent |
| Strong alkalis | Good | Good | Good | Excellent | Excellent | Excellent | Poor |
| Weak alkalis | Good | Good | Good | Excellent | Excellent | Excellent | Fair |
| Relative price | $ | $$ | $$ | $$ | $ | $$$ | $$$$ |
Can It Handle Your Media?
Pick your type of medium. Ratings are for room temperature — higher temperature or concentration lowers them. Send us the medium, concentration and temperature and we confirm the compound before production.
| Medium | NR | NBR | CR | IIR | EPDM | CSM | FKM | PTFE lined | Usually built in |
|---|---|---|---|---|---|---|---|---|---|
| Fresh water, drinking water | A | A | A | A | A | A | A | A | EPDM |
| Hot water ≤ 100 °C | X | C | B | A | A | B | C | A | EPDM |
| Seawater, brine | A | A | A | A | A | A | A | A | CR or EPDM |
| Wastewater, sewage | B | A | A | A | A | A | A | A | EPDM or NBR |
| Oily water, bilge water | X | A | B | X | C | B | A | A | NBR |
| Mineral oil, hydraulic oil | X | A | B | X | X | B | A | A | NBR |
| Diesel, heating oil | X | A | C | X | X | C | A | A | NBR |
| Gasoline (petrol) | X | B | C | X | X | C | A | A | NBR or FKM |
| Hot oil above 80 °C | X | C | C | X | X | C | A | A | FKM |
| Vegetable oil, animal fat | C | A | B | B | C | B | A | A | NBR |
| Compressed air, oil-free | A | A | A | A | A | A | A | A | EPDM |
| Compressed air with oil mist | X | A | B | X | C | B | A | A | NBR |
| Natural gas, LPG | C | A | B | X | X | B | A | A | NBR |
| Flue gas (SO₂, moist) | C | C | B | A | A | A | A | A | EPDM or IIR |
| Sulphuric acid ≤ 50 % | B | C | B | A | A | A | A | A | EPDM |
| Sulphuric acid 50–96 % | X | X | X | C | C | B | A | A | PTFE lined or FKM |
| Hydrochloric acid ≤ 36 % | C | C | C | B | B | A | A | A | CSM or PTFE lined |
| Nitric acid ≤ 10 % | X | X | C | B | B | A | A | A | CSM or FKM |
| Phosphoric acid ≤ 85 % | B | B | B | A | A | A | A | A | EPDM |
| Acetic acid ≤ 10 % | B | B | B | A | A | B | B | A | EPDM |
| Caustic soda ≤ 50 % | A | B | A | A | A | A | B | A | EPDM |
| Ammonia solution | B | B | A | A | A | A | X | A | EPDM |
| Sodium hypochlorite ≤ 15 % | X | C | C | B | B | A | A | A | CSM or PTFE lined |
| Salt solutions | A | A | A | A | A | A | A | A | EPDM |
| Benzene, toluene, xylene | X | X | X | X | X | X | A | A | PTFE lined or FKM |
| Acetone, MEK | C | X | X | A | A | C | X | A | EPDM |
| Alcohols (ethanol, methanol) | A | B | A | A | A | A | C | A | EPDM |
| Ethylene glycol, antifreeze | A | A | A | A | A | A | A | A | EPDM |
| Abrasive slurry (sand, tailings) | A | B | B | C | B | B | C | C | NR |
| Lime and cement slurry | A | A | A | A | A | A | A | A | NR or EPDM |
| FGD slurry (gypsum, chlorides) | B | C | B | A | A | A | A | B | EPDM or IIR |
No medium matches your search. Tell us the medium, concentration and temperature and we’ll check it for you. | |||||||||
Pressure, Temperature and Vacuum
Choose the class by working pressure. Vacuum is the most a joint of that class takes on a pump suction line.
Pressure classes
| Class | Working pressure |
Burst pressure |
Vacuum |
|---|---|---|---|
| PN10 | 1.0 MPa | 2.0 MPa | 53.3 kPa (400 mmHg) |
| PN16 | 1.6 MPa | 3.0 MPa | 86.7 kPa (650 mmHg) |
| PN25 | 2.5 MPa | 4.5 MPa | 100 kPa (750 mmHg) |
Temperature
−15 to +100 °C standard. −30 to +150 °C with a special compound.
Higher vacuum
Above the listed vacuum, order the joint with a vacuum support ring.
Rating by size
| Size | Highest class |
|---|---|
| DN32 – DN300 | PN25 |
| DN350 – DN600 | PN16 |
| DN700 – DN1000 | PN10 |
Larger bores carry a lower rating with the same rubber wall. Need more? We add plies and control rods — send your design pressure.
Flange Standards and Materials
Pick your pipe’s flange standard, class and size. If the numbers match your flange, our joint bolts straight on — no adapter, no re-drilling.
Check your flange
Standards we drill to
-
EN 1092-1PN6 · PN10 · PN16 · PN25 · PN40 — same drilling as DIN, BS 4504, GB/T 9119
-
ASME B16.5 / B16.47Class 150 · Class 300 · Series A 26"–60"; AWWA C207 Class D
-
JIS B22205K · 10K · 16K · 20K
-
AS 2129 / AS 4087Table D · Table E · PN16
-
Your drawingGOST, BS 10 or any special drilling; tapped holes on request
Flange material and finish
- Carbon steel Q235 Hot-dip galvanised, zinc plated or painted (blue / black)
- Stainless steel 304: For corrosive environments and seawater areas
- Stainless steel 316L For chemical plants and coastal installations
Options
Add these when the job needs them — each one is priced separately.
Control rods
Stop over-extension under pressure thrust. Fit them at pump outlets or where the pipe is not anchored.
Vacuum support ring
A steel ring inside the arch keeps it from collapsing on suction lines.
PTFE lining
White PTFE liner for strong acids, solvents and food-grade media.
Tapped holes & custom drilling
Threaded bolt holes for wafer valves, or drilling to your drawing.
Why Buy From Our Factory
A rubber joint is a simple product. What decides whether it lasts is the right material for your working conditions — and then the price.
Working conditions confirmed first
Size, pressure, medium, temperature, length and flange drilling are checked against your data and sent back on a drawing before production starts.
Full material, nothing thinned
Flanges and unions to full thickness, cord plies matched to the pressure class, rubber compounded in-house for your medium.
Pressure tested before packing
Every joint is tested at 1.5 × working pressure and checked for leaks and bulging.
Factory price, quoted the same day
You buy from the production line, not through a trader. Send size, pressure and medium and get a price the same working day.
Where It’s Installed
Pump suction and discharge
Stops pump vibration and noise travelling down the line. Add a vacuum ring on the suction side.
HVAC chillers and cooling towers
Takes thermal movement and isolates vibration at chillers, cooling towers and AHUs.
Water treatment and pump stations
Compensates settlement and misalignment between pumps, valves and headers.
In Service
Rubber joints from our factory, photographed by customers on site.
Single Sphere Rubber Expansion Joint Price
What you pay depends on a few choices. Send them and we quote the same day.
What changes the price
- Size : DN is the biggest factor
- Rubber : EPDM and NR cost less than NBR, CR or PTFE lined
- Pressure class : PN16 uses more plies than PN10
- Flange : Galvanised carbon steel vs SS304 / SS316L
- Options : Control rods, vacuum ring
- Quantity : wholesale price is different with project price
Reference price
| Size | Price per piece |
|---|---|
| DN50 | Contact Us |
| DN100 | Contact Us |
| DN150 | Contact Us |
| DN200 | Contact Us |
| DN300 | Contact Us |
EPDM, PN16, galvanised carbon steel flanges, EXW Gongyi / FOB Tianjin or Ningbo or Guangzhou. Prices change with steel and rubber costs.
Downloads
Datasheets, drawings and references for submittals.
Control rods
For all our rubber joints
Frequently Asked Questions
What sizes do you make?
Standard sizes run from DN32 (1¼”) to DN1000 (40″). DN1200 to DN3200 are built on the same single-arch design — see our large diameter rubber expansion joints.
Which rubber should I choose for hot water?
EPDM. Standard EPDM handles hot water to about +100 °C; above that we use a heat-resistant EPDM compound. Tell us the maximum temperature.
Can I use it on a pump suction line?
Yes. Check the vacuum rating of the class you choose (53.3 kPa for PN10, 86.7 kPa for PN16). For more vacuum, order it with a vacuum support ring.
Do I need control rods?
Fit them when the pipe on either side is not anchored — usually at pump outlets and on high-pressure lines. They stop the joint over-extending under pressure thrust.
Can you drill the flanges to ANSI or JIS?
Yes. We drill to EN 1092-1, ASME B16.5 Class 150, JIS and GB, or to your drawing. Tapped bolt holes are available.
What is the MOQ and lead time?
MOQ 1 pcs. Common sizes in EPDM and NBR are usually in stock and ship in 3-7 days; other sizes take 10-20 days.
Related Products
Single Sphere Rubber Expansion Joint
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- Rubber Options: NR / EPDM / NBR / Customized
- Size Range: DN32–DN3100
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- Customization: According to Your Drawing
- Applications: Water, HVAC & Industrial Piping
Threaded Rubber Expansion Joint
- Connection: Threaded Connection
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Single Sphere Rubber Expansion Joint
- Structure: Double Sphere
- Rubber Options: NR / EPDM / NBR / Customized
- Size Range: DN32–DN600
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- Customization: According to Your Drawing
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Rubber Expansion Joint with Control Units
- Structure: Single Sphere with Control Rods
- Rubber Options: NR / EPDM / NBR / Customized
- Size Range: DN32–DN3100
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- Customization: According to Your Drawing
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PTFE Lined Rubber Expansion Joint
- Lining: PTFE Lined
- Rubber Options: EPDM / NBR / Customized
- Size Range: Customized
- Flange Options: Carbon Steel / Stainless Steel
- Customization: According to Your Drawing
- Applications: Chemical & Corrosive Media
Concentric Reducer Rubber Expansion Joint
- Structure: Concentric Reducer
- Centerline: Same Centerline
- Rubber Options: NR / EPDM / NBR / Customized
- Size Range: Customized
- Flange Options: Carbon Steel / Stainless Steel
- Applications: Different-Diameter Pipeline Connections
Eccentric Reducer Rubber Expansion Joint
- Structure: Eccentric Reducer
- Rubber Options: NR / EPDM / NBR / Customized
- Size Range: Customized
- Flange Options: Carbon Steel / Stainless Steel
- Customization: According to Your Drawing
- Applications: Pumps & Different-Diameter Pipelines
90° Elbow Rubber Expansion Joint
- Structure: 90° Elbow
- Rubber Options: NR / EPDM / NBR / Customized
- Size Range: Customized
- Flange Options: Carbon Steel / Stainless Steel
- Customization: According to Your Drawing
- Applications: Pipeline Direction Changes
Flanged Duckbill Check Valve
- Structure: Duckbill Type
- Rubber Options: EPDM / NBR / Customized
- Connection: Flanged
- Size Range: Customized
- Function: Backflow Prevention
- Applications: Drainage, Sewage & Water Systems
Rectangular Rubber Expansion Joint
- Structure: Rectangular Type
- Rubber Options: EPDM / Customized
- Size Range: Customized
- Connection: Flanged Frame
- Customization: According to Your Drawing
- Applications: Ducts & Large Pipeline Systems
Large Diameter Rubber Expansion Joint
- Structure: Large Diameter Type
- Rubber Options: NR / EPDM / NBR / Customized
- Size Range: Large Diameter / Customized
- Connection: Flanged
- Customization: According to Your Drawing
- Applications: Water & Industrial Pipeline Systems
Send Your Size, Pressure and Medium
We reply with a drawing and a price within 24 hours on working days.
Contact Us
Send your size, pressure, medium, flange standard and quantity. This block follows the clean contact layout of your reference page.