Mechanical Seals, Rotary Joints & Rotary Unions — Manufactured in Mumbai, India
Need to stop leakage around a rotating shaft, replace a failing or imported seal, or transfer steam, hot oil, water, coolant, air or gas into rotating machinery?
Ashish Seals India has manufactured industrial sealing products in Mumbai since 2005. Our four product families — mechanical seals, rotary joints, rotary unions and thermosyphon pot systems — are designed, machined and tested in-house under our ISO 9001:2015 system, and supplied as standard, custom and replacement products to plants across India and export markets.
They serve pumps, agitators, mixers, reactors, vessels, dryers, blenders, drums, rolls, cylinders and machine-tool spindles across chemical, pharmaceutical, paper, textile, steel, food, power and general engineering industries.
Which Industrial Sealing Product Do You Need?
| Your requirement | Product | Typical equipment |
|---|---|---|
| Stop leakage around a rotating shaft | Mechanical Seal | Pumps and rotating process equipment |
| Seal a shaft entering a mixing tank | Agitator Mechanical Seal | Agitators, mixers, process tanks |
| Seal a shaft entering a pressure/vacuum vessel | Reactor Mechanical Seal | Reactors, glass-lined reactors, vessels |
| Transfer steam, water or hot oil into a rotating roll | Rotary Joint | Drums, rolls, cylinders, dryers |
| Transfer coolant, oil, air or gas through a rotating shaft | Rotary Union | Spindles, shafts, machine systems |
| Separate supply and return in one connection | Dual-Flow Joint / Union | Heating and cooling circuits |
| Circulate barrier fluid around a double seal | Thermosyphon Pot System | Double mechanical-seal installations |
A note on terminology: buyers use mechanical seal, shaft seal and pump seal for the same requirement, and rotary joint and rotary union interchangeably. Products that look identical outside can have different faces, elastomers and pressure limits inside — so we select from your equipment, medium, pressure, temperature and speed, never from the product name or a photo alone.
Mechanical Seals (Shaft Seals)
A mechanical seal controls liquid, vapour or gas leakage where a rotating shaft passes through the stationary casing of a pump, agitator, mixer, reactor, dryer, blender or vessel. We manufacture the complete range:
Agitator Seals
Top-, bottom- and side-entry, single and double, for pressure and vacuum vessels.
View Agitator Seals →
Cartridge Seals
Pre-set single and double cartridges that eliminate installation errors.
View Cartridge Seals →
Rubber Bellow Seals
Economical helical- and conical-spring designs for water and process pumps.
View Rubber Bellow Seals →
Metal Bellow Seals
For hot-oil and thermic-fluid service where elastomers fail.
View Metal Bellow Seals →
Special & Replacement Seals
Reverse-balanced, bi-directional and engineered designs, plus one-to-one replacements for imported and discontinued seals built from your sample or drawing.
View Special Seals →Face materials: carbon, ceramic, silicon carbide, tungsten carbide. Elastomers and metallurgy matched to your exact fluid, concentration and temperature.
Rotary Joints
A rotary joint transfers steam, water, hot oil or thermic fluid between stationary piping and a rotating drum, roll or cylinder — the workhorse connection on drying cylinders, heated and cooling rolls, calenders and corrugators in the paper, textile, packaging, rubber and food industries.
We manufacture rotary joints in MS, SS 304 and SS 316 construction:
Dual-Flow Rotary Joints
Supply and return through one assembly, with siphon arrangements for condensate removal.
View Dual-Flow Joints →
Steam Rotary Joints
For steam-heated drums, drying cylinders and calender rolls.
View Steam Joints →
Thermic-Fluid Rotary Joints
For hot-oil circulation through heated rolls and thermal-process machinery.
View Thermic-Fluid Joints →Selection is based on the medium, pressure, temperature, rotational speed, connection size and mounting orientation — send your machine details or drawing and we'll specify the right joint.
Rotary Unions
A rotary union provides a sealed media connection between stationary piping and a rotating shaft, spindle or machine component — carrying water, coolant, oil, air, gas, hydraulic fluid and other compatible media into machine-tool spindles, hose reels, and automated and hydraulic machinery.
Available in MS, SS 304 and SS 316, in these configurations:
Single-Flow Rotary Unions
One sealed passage for supply or return media through a rotating shaft.
View Single-Flow Unions →
Dual-Flow Rotary Unions
Separate supply and return paths through a single rotating connection.
View Dual-Flow Unions →
Steam Rotary Unions
Built for steam service on rotating shafts and machine systems.
View Steam Unions →
Thermic-Fluid Rotary Unions
For hot-oil and heat-transfer fluid service on rotating machinery.
View Thermic-Fluid Unions →Rotary Joint vs Rotary Union — What's the Difference?
In practice: rotary joints serve rotating drums, rolls and cylinders (paper machines, dryers, calenders), while rotary unions serve rotating shafts and spindles (machine tools, hydraulic and pneumatic systems), often at higher speeds with multiple passages. The terms overlap in industry usage, so we confirm the correct product from your equipment construction and operating conditions — not the name you searched for.
Thermosyphon Pot Systems
A thermosyphon pot stores and circulates barrier or buffer fluid around a double mechanical seal, keeping the seal faces lubricated and cooled on pumps, agitators, mixers and reactors handling hazardous, volatile or poorly lubricating fluids.
Thermosyphon Pot System
We build thermosyphon systems to your seal arrangement and process pressure: pressurised or unpressurised, with cooling coils, level/pressure/temperature instrumentation, and connection sizes and materials to match your installation.
View Thermosyphon Pot Systems →Standard, Custom and Replacement Products
Standard
Proven configurations across all four families, ready to specify from your operating data.
Replacement
We reverse-engineer seals, joints and unions from your sample, drawing, photographs or measured dimensions, including equivalents for imported and discontinued products with long OEM lead times. External appearance alone is never enough: we verify the replacement against your actual fluid, pressure and temperature before manufacturing.
Custom
Non-standard shaft diameters, restricted installation space, unusual connections, corrosive media, high/low temperatures, vacuum service, special speeds and OEM equipment-builder requirements.
What to Send for Product Selection and Quotation
The more of this you share, the faster and more accurate the quotation:
Equipment & Dimensions
- Equipment type, make and model
- Shaft or sleeve diameter; seal chamber or mounting dimensions
- Thread or flange sizes (for joints and unions)
Operating Conditions
- Process medium and concentration
- Operating pressure and temperature
- Rotational speed and direction
Requirement Details
- Single/double seal or single/dual-flow requirement
- Existing sample, drawing or clear photographs
- Required quantity
Don't have complete data?
Send the machine nameplate and photographs — our engineers will tell you exactly what else is needed.
Why Buy from Ashish Seals
20+ years manufacturing sealing products in Mumbai (since 2005)
ISO 9001:2015 certified — design, CNC/VMC machining, lapping, assembly and hydro/vacuum testing all in-house
One supplier for the full rotating-equipment scope: seals, joints, unions and seal-support systems
Free engineering selection review on every enquiry before you spend a rupee
Replacement specialists for imported and discontinued products, from samples and drawings
Pan-India supply and export with responsive lead times from our Mumbai facility
Frequently Asked Questions
Is a mechanical seal the same as a shaft seal?
Buyers use the terms interchangeably. A mechanical seal is the face-type seal we manufacture; "shaft seal" is broader and also covers lip seals, oil seals and packing.
What is the difference between a rotary joint and a rotary union?
Rotary joints serve rotating drums, rolls and cylinders; rotary unions serve rotating shafts and spindles, often at higher speeds. Usage overlaps, so we confirm from your equipment and conditions.
What does a thermosyphon pot system do?
It circulates barrier or buffer fluid around a double mechanical seal to lubricate and cool the faces — essential for hazardous, volatile or poorly lubricating process fluids.
Can you manufacture a replacement from a sample or drawing?
Yes — this is a core service. We reverse-measure the sample or work from your drawing, then verify materials against your operating conditions before manufacturing.
Which materials are your rotary joints and unions made in?
MS, SS 304 and SS 316 as standard, with internal seals matched to the medium and temperature.
Do you supply outside Mumbai?
Yes — we supply across India and to international buyers, with export documentation support.
What information do you need for a quotation?
Equipment details, shaft/connection size, medium, pressure, temperature, speed, flow or seal arrangement, and a drawing, sample or photos if available.
Do you make seals for glass-lined reactors?
Yes — GLR mechanical seals are part of our reactor seal range, in single, double and dry-running configurations.
Request Product Selection or a Quotation
Send your equipment details, process medium, dimensions, operating conditions and any drawing, sample or photographs. Our engineers will confirm whether your application needs a mechanical seal, rotary joint, rotary union, thermosyphon system — or a custom design — and quote the exact product for your machine.