Rotary Joint Manufacturer & Supplier in Mumbai, India
Need a rotary joint for a dryer cylinder, chill roll, calender or machine-tool spindle — or a replacement for a joint that keeps leaking?
Our range covers single flow rotary joints, dual flow rotary joints with siphon arrangements, steam rotary joints, water rotary joints, hot oil and thermic fluid rotary joints, hydraulic rotary unions, air and pneumatic rotary unions and coolant rotary joints, plus application-specific designs built from your sample or drawing.
Rotary Joint Types We Manufacture
Single Flow Rotary Joints
For applications where the medium travels in one direction through the joint, with supply and return connected at opposite ends of the cylinder. Compact, self-supported designs with balanced mechanical seals, available with carbon guides or ball bearings.
View Single Flow Rotary Joints →
Dual Flow Rotary Joints
Supply and return lines connect on the same side of the cylinder, with the return carried through a siphon pipe inside the joint. The standard choice for steam-heated dryers where condensate must be removed continuously.
View Dual Flow Rotary Joints →
Steam Rotary Joints
For steam-heated dryer cylinders, corrugators, calenders and heated rolls, with stationary or rotary siphon arrangements for condensate removal. Built for continuous running at process temperature and pressure.
View Steam Rotary Joints →
Thermic Fluid Rotary Joints
For thermic-fluid-heated rolls, calenders and process drums where temperatures rule out standard elastomer construction. Face materials, gaskets and clearances selected for hot oil service.
View Hot Oil Rotary Joints →What Is a Rotary Joint and How Does It Work?
A rotary joint (also called a rotary union) is a mechanical device that connects stationary supply and return piping to a rotating drum, roll, cylinder or spindle, so a fluid can flow into and out of the equipment while it turns. It has two essential elements:
Between them, a spring-loaded seal — typically a carbon face running against a hardened counter-face — closes the gap between the stationary and rotating parts. Internal guides or bearings keep the two parts aligned, and in dual flow designs a siphon pipe inside the joint carries the return medium (usually condensate) back out through the same connection end.
That seal interface is why a correctly selected rotary joint runs for years and a wrongly selected one leaks within weeks. Excess speed, wrong face materials, misalignment, unsupported piping loads or a worn journal will destroy the sealing surfaces. This is also why we ask about your operating conditions before quoting.
Buyers use "rotary joint" and "rotary union" interchangeably, and in practice they are the same device. "Rotary union" is used more often for hydraulic, pneumatic and multi-passage designs, while "rotary joint" is the common term for steam, water and hot oil service.
Main Parts of a Rotary Joint
Body and end cap — the stationary housing, in cast iron, carbon steel, stainless steel or bronze depending on the medium
Seal faces — carbon graphite running against hardened stainless steel, silicon carbide or tungsten carbide, chosen for the fluid, temperature and speed
Nipple or rotating shaft and springs — the rotating connection with spring loading that keeps the faces closed as they wear
Guides, bearings, gaskets, flanges and siphon connections — carbon guides or ball bearings for alignment, plus the fittings that adapt the joint to your cylinder
Construction varies by design — single flow, dual flow, self-supported, externally supported, with or without siphon, threaded or flanged. We build all of these.
Find the Right Rotary Joint for Your Equipment
Start with the machine and the medium you need to transfer. This table maps common requirements to the right category — final selection always depends on your operating data.
| Your requirement | Rotary joint category | What we need from you |
|---|---|---|
| Steam to a paper, textile or corrugator dryer | Steam Rotary Joints / Dual Flow with siphon | Cylinder size, steam pressure, temperature, RPM, siphon type |
| Cooling water to a chill roll or drum | Water Rotary Joints | Roll journal size, flow rate, pressure, temperature, RPM |
| Thermic fluid to a heated roll or calender | Hot Oil Rotary Joints | Fluid name, max temperature, pressure, RPM, connection size |
| Hydraulic oil to a rotating cylinder or chuck | Hydraulic Rotary Unions | Pressure, flow, RPM, number of passages, mounting details |
| Air to chucks, clutches, brakes or tension controls | Air & Pneumatic Rotary Unions | Air pressure, RPM, connection size, duty cycle |
| Coolant through a CNC spindle | Coolant Rotary Joints | Spindle taper/journal details, coolant pressure, max RPM |
| Supply and return at the same end of the cylinder | Dual Flow Rotary Joints | Cylinder drawing, siphon details, medium, pressure, RPM |
Two rotary joints with the same thread size can use different seal faces, guides, siphon arrangements and internal clearances. Never select a joint from the connection size alone — send us the operating details and we'll confirm the correct design before you order.
Single Flow vs Dual Flow, Siphon or No Siphon: Choosing a Configuration
| Comparison | The difference | When it matters |
|---|---|---|
| Single flow vs dual flow | One direction of flow vs supply and return through the same joint | Dual flow with a siphon is standard for steam dryers; single flow suits simple in-and-out circuits |
| Stationary vs rotary siphon | Siphon pipe fixed vs rotating with the cylinder | Affects condensate removal at different speeds — critical on paper machines |
| Self-supported vs externally supported | Joint carried on its own internal guides vs supported by rods or brackets | Self-supported joints tolerate journal misalignment better and simplify installation |
| Carbon guide vs ball bearing | Sliding carbon guides vs rolling-element bearings | Bearing choice changes speed capability, service life and maintenance pattern |
| Threaded vs flanged connection | Screwed onto the journal vs bolted to a flange | Determined by your cylinder design; affects removal and maintenance time |
| Standard vs high-temperature construction | General-duty materials vs faces and gaskets rated for hot oil and high-pressure steam | Running a standard joint on hot oil service is a common cause of early failure |
No configuration is universally better.
Send your conditions and we'll recommend the one that lasts on your machine — that recommendation costs you nothing.
Send Your Operating Conditions →How to Choose the Right Rotary Joint
Our engineers run every enquiry through this checklist — the more of it you can send, the faster and more accurate your quotation:
Equipment & Dimensions
- Equipment — dryer cylinder, chill roll, calender, corrugator, mixing mill, spindle, chuck or other machine
- Journal or connection size — thread size and standard (BSP/NPT) or flange details, rotor bore
- Equipment condition — journal wear, runout, vibration and piping alignment (a perfect joint fails on a bad journal)
- Existing joint details — make, model, drawing, sample, nameplate or clear photographs
Operating Conditions
- Medium — steam, water, thermic fluid, hydraulic oil, air or coolant, with any contamination or solids
- Pressure — normal, maximum, vacuum and fluctuations
- Temperature — operating and maximum, including start-up conditions
- Speed — cylinder or spindle RPM, and whether the duty is continuous or intermittent
Requirement Details
- Flow arrangement — single flow or dual flow, and siphon details if condensate must be removed
- Mounting and support — self-supported or externally supported, space constraints, hose connections
- Quantity and required delivery
Industries and Equipment We Serve
Our rotary joints run on dryer cylinders, chill rolls, calenders, corrugators, mixing mills, extruder rolls, rotary dryers, spindles and index tables across:
Rotary Joint vs Swivel Joint, Flexible Hose and Stuffing Box
| Method | Construction | Typical use | Key difference |
|---|---|---|---|
| Rotary joint / union | Spring-loaded seal faces between stationary body and rotating nipple | Continuous rotation — dryers, rolls, spindles | Sealed fluid transfer at full rotating speed |
| Swivel joint | Bearing-supported joint for slow or partial rotation | Loading arms, hose reels, articulating pipework | Handles movement, not continuous high-speed rotation |
| Flexible hose | Reinforced hose absorbing limited motion | Short travel and vibration, not rotation | Twists and fails if used on a rotating connection |
| Stuffing box / packing | Compressed packing around the rotating pipe | Older drums and dryers | Requires leakage and constant adjustment; high friction |
Converting an old packed gland or improvised hose connection to a proper rotary joint typically cuts leakage, downtime and journal wear on most rotating drums and rolls — ask us whether your machine is a candidate.
Why Buy Rotary Joints from Ashish Seals
20+ years of rotating-equipment sealing experience (since 2005), covering rotary joints and the mechanical seals they work alongside
ISO 9001:2015 certified, everything machined and tested in-house in Mumbai
Engineering-led selection — we review your medium, pressure, temperature and speed before quoting, free of charge
Replacement expertise for imported and discontinued rotary joints from samples, drawings and photographs
Repair and failure analysis — we solve repeat leakage problems, not just resupply joints
Pan-India supply and export to international buyers
Frequently Asked Questions
What is a rotary joint?
A device that connects stationary piping to a rotating drum, roll, cylinder or spindle so that steam, water, oil, air or coolant can flow into and out of the equipment while it rotates, sealed by spring-loaded faces between the stationary and rotating parts.
Is a rotary joint the same as a rotary union?
Yes — the two terms describe the same device. "Rotary union" is used more often for hydraulic, pneumatic and multi-passage designs, while "rotary joint" is the common term for steam, water and hot oil service.
How does a rotary joint work?
A stationary body connects to your piping and a rotating nipple fixes to the equipment journal. Spring-loaded seal faces close the gap between the two while internal guides or bearings keep them aligned, allowing sealed fluid transfer during rotation.
What is a siphon and when do I need one?
A siphon is a pipe inside the cylinder and joint that carries condensate back out of a steam-heated drum. Any steam dryer that must remove condensate continuously needs a dual flow joint with a stationary or rotary siphon matched to the machine speed.
Should I choose single flow or dual flow?
Single flow when supply and return connect at opposite ends of the cylinder; dual flow when both must connect at the same end, with the return carried through a siphon. Your cylinder design and condensate removal needs decide it.
Which rotary joint suits a paper dryer / corrugator / chill roll / heated calender?
It depends on the medium, pressure, temperature, RPM and journal details. As a starting point: steam joints with siphons for dryers and corrugators, water joints for chill rolls, hot oil joints for thermic-fluid calenders. We confirm the exact design from your data.
What pressures, temperatures and speeds can your rotary joints handle?
Ratings depend on the design, seal faces, guides and construction materials, so there is no single figure. Send your operating conditions and we will state the rating of the joint we recommend for your duty.
Which materials are used in your rotary joints?
Bodies in cast iron, carbon steel, stainless steel or bronze; seal faces in carbon graphite, hardened stainless steel, silicon carbide or tungsten carbide; gaskets and elastomers selected for the medium and temperature.
Can you make a rotary joint from a sample or drawing?
Yes. We reverse-measure samples and manufacture from drawings after a technical review of dimensions, materials and operating conditions.
Can you replace imported or discontinued rotary joints?
Yes — this is one of our core services. Send the original joint, drawing, machine details or clear photographs with dimensions.
What is the price of a rotary joint in India?
It varies with type, size, medium, pressure and temperature rating, materials, siphon arrangement and quantity. Two joints with the same thread size can differ significantly. Send your details for a specific quotation.
What information do you need for a quotation?
Machine type, journal or connection size, medium, pressure, temperature, RPM, flow arrangement (single or dual flow, siphon details), a drawing or sample if available, and quantity.
Why does my rotary joint keep leaking?
Common causes: worn seal faces, excess speed for the design, misalignment between joint and journal, unsupported hose or piping loads, water hammer, wrong materials for the medium, or a worn journal. Send the failed joint for analysis — a new identical joint will fail the same way if the cause isn't fixed.
Can a leaking rotary joint be repaired?
Often, yes — after inspection of the seal faces, guides, springs, nipple and body. We advise repair, refurbishment or replacement case by case.
How long does a rotary joint last?
There is no universal figure. Life depends on selection, speed, alignment, piping support, medium condition and maintenance. Correct selection plus a healthy journal gives the longest service life.
What is the HSN / HS code for rotary joints?
Rotary joints and unions are commonly classified under HS 8487.90 (HSN 84879000 in India) as machinery parts. Confirm current classification and GST treatment before invoicing.
Do you supply outside Mumbai?
Yes — we manufacture in Mumbai and supply across India and to export markets.
How do I get the right rotary joint recommended?
Send your machine type, journal size, medium, pressure, temperature, RPM and any drawing, sample or photographs to our technical team.
Request a Rotary Joint Recommendation or Quotation
Don't select a rotary joint from the thread size, appearance or an old part number. Send us your machine type, journal or connection size, medium, pressure, temperature, RPM, flow arrangement, existing joint details and quantity — with a drawing, sample or photographs if you have them.
Our engineers will confirm whether you need a single flow joint, dual flow joint with siphon, steam joint, water joint, hot oil joint, hydraulic union, pneumatic union, coolant joint or a custom replacement — and quote the exact design for your application.