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Reactor Mechanical Seal Manufacturer in Mumbai, India
Running a glass-lined or stainless steel reactor that needs a seal built for real batch conditions — not a catalogue part guessed from vessel size?
A reactor seal is built around the same principle as an agitator mechanical seal, but the duty is harder: the vessel cycles between vacuum and pressure, hot and cold, clean and fouled, several times a day. A seal sized only for the nameplate pressure rating will fail the first time the batch goes off-recipe. So we don't quote from vessel volume alone — send us the full batch profile and we'll size the seal for the worst condition it will actually see, not the average one.
Types of Reactor Mechanical Seals
Single Reactor Mechanical Seal
One set of sealing faces — the economical choice where the process fluid presents little to no risk to the environment and conditions stay within moderate pressure and temperature. Common on general-purpose SS reactors and non-hazardous batch chemistry.
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Double Reactor Mechanical Seals
Two sets of faces with a barrier or buffer fluid between them, giving a second stage of containment for toxic, flammable or solvent-based reactions, and for reactors that swing between vacuum and pressure within the same batch.
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Top Entry Reactor Mechanical Seals
Mounted above the reactor, shaft hanging down through the manway or nozzle into the batch. The standard arrangement on glass-lined and SS reactors alike — and the position where shaft deflection through heating and cooling cycles matters most.
View Top-Entry Reactor Seal →
Bottom Entry Reactor Mechanical Seals
Fitted at the base of the reactor, close to the outlet nozzle — where product settling, solids and residue at the faces are the main design concern. Used where the process or discharge arrangement calls for a lower-mounted drive.
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Horizontal Mount Entry Reactor Mechanical Seals
Fitted where the shaft enters through the side wall of a horizontal reactor or kettle. Radial loading and the product level at the seal drive the design — typical on horizontal reaction vessels and specialised batch equipment.
View Horizontal-Mount Reactor Seal →
Dry Running Mechanical Seals
Purpose-built for reactors where the process fluid presents little to no risk to the environment and no liquid reaches the faces — most often top-entry reactors running above the batch level. Face combination and temperature decide whether a dry-running design will hold up.
View Dry-Running Reactor Seal →Every double reactor seal works together with a barrier-fluid support system. See our thermosyphon pot systems — we supply the seal and its support system as a matched pair.
What We Need to Quote Your Reactor Seal
Reactor seals are built around the vessel and the batch, not picked off a shelf. The more of this you can send, the faster and more accurate the quotation — but don't hold back an enquiry because a few rows are blank. Photographs of the existing installation fill many of the gaps.
| Parameter | What to Send | Why It Matters |
|---|---|---|
| Reactor type | Glass-lined, SS316, mild-steel lined, or other construction | Sets material compatibility and nozzle/flange standard |
| Entry position | Top, bottom, or horizontal mount | Determines orientation and drive arrangement |
| Reactor capacity | Working volume in litres | Indicates shaft length and expected torque |
| Shaft diameter | Actual shaft or sleeve diameter at the seal | Sets face, sleeve and internal dimensions |
| Nozzle / manway dimensions | OD, PCD, bolt count, pilot, mounting depth | Needed for gland and cartridge design |
| Installation space | Available height above the reactor, clearance | Avoids clashes with the drive or platform |
| Agitator speed | Normal and maximum RPM | Affects heat generation and face choice |
| Rotation | CW, CCW or reversible | Directional vs bidirectional design |
| Design pressure / vacuum | Normal, maximum, and whether the batch cycles between the two | Sets seal balance and support needs |
| Temperature profile | Heating, holding and cooling range across the batch, plus CIP/SIP | Drives face, elastomer and metal choice |
| Process media | Chemical name(s), concentration, pH | Material compatibility |
| Batch behaviour | Clean, sticky, abrasive, crystallising, polymerising, foaming | Changes geometry and flushing |
| Viscosity | At start, mid-batch and end of reaction | Drag and product movement at the seal |
| Solids | %, particle size, abrasiveness | Face materials and clearances |
| Batch cycle | Batches per day, cycle time, number of heating/cooling swings | Indicates thermal and mechanical fatigue on the seal |
| Shaft runout | Measured at the seal location, if known | Excess runout is a leading leak cause |
| Leakage risk | Non-hazardous, toxic, volatile, flammable | Single vs double decision |
| Lubrication | Dry, product, liquid or gas barrier | How the faces are cooled |
| Existing seal | Model, drawing, photos, sample, failure history | Enables a compatible replacement |
| Order details | Quantity, delivery location, required date | Production and dispatch planning |
Typical builds cover pressures up to [XX bar], vacuum down to [full vacuum], and temperatures from [–20 °C to 250 °C], depending on the material combination. Final limits are stated on the approved design.
Choose the Right Reactor Mechanical Seal
Use this table for a first shortlist. The final choice always comes down to your media, pressure or vacuum swing across the batch, temperature profile, and how strictly leakage has to be controlled.
| Seal Type | Best Suited For | Typical Applications | Lubrication | Entry Position |
|---|---|---|---|---|
| Single reactor seal | Non-hazardous process fluid, moderate pressure and temperature | General SS reactors, low-risk batch chemistry | Dry-running or product-lubricated | Top, bottom or horizontal |
| Double reactor seal | Toxic, volatile or solvent-based reactions | Glass-lined reactors, pharma and agrochemical batches | Barrier or buffer fluid | Top, bottom or horizontal |
| Top-entry reactor seal | Standard glass-lined and SS reactor drives | Chemical, pharma and agrochemical reactors | Dry, liquid or gas-supported | Top entry |
| Bottom-entry reactor seal | Lower-mounted drive arrangements | Reactors with bottom-driven agitation | Product or barrier-fluid lubricated | Bottom entry |
| Horizontal-mount reactor seal | Horizontal reaction vessels and kettles | Specialised batch and blending equipment | Barrier or buffer fluid | Horizontal (side) entry |
| Dry-running reactor seal | Process fluid presents little to no environmental risk | Top-entry reactors running above batch level | Dry-running face combination | Mainly top entry |
Where your specification calls for standard envelopes, we work to [EN 12756 / DIN 24960 dimensions and DIN 28138 reactor and agitator seal requirements].
Industries We Serve
Reactor mechanical seals go wherever a rotating agitator shaft enters a pressurised, vacuum-rated or contamination-sensitive reaction vessel:
Why Buy from Ashish Seals India?
We've manufactured industrial sealing solutions in Mumbai since 2005, with the entire process under one roof:
Application-based seal selection by our own engineering team, sized for your batch profile
Custom design and development, including reverse engineering from a worn sample
CNC and VMC machining, seal-face lapping [checked to light-band flatness]
Component inspection, assembly and testing before every dispatch, including hydro testing
Matched thermosyphon and barrier-fluid systems supplied with the seal
[Repair and reconditioning of existing seals]
Frequently Asked Questions
What is a reactor mechanical seal?
It's the seal that controls leakage where a rotating agitator shaft passes through the wall of a reactor or process vessel. It has to hold through the pressure, vacuum and temperature swings that happen across a single batch.
How is a reactor seal different from an agitator seal?
The two overlap heavily — a reactor seal is an agitator seal built for the extra stress of batch processing. The difference is the duty cycle: a reactor seal has to survive repeated swings between vacuum and pressure, and heating and cooling, within the same batch, not just steady-state running.
Should I use a single or double reactor seal?
Single where the process fluid presents little to no risk to the environment and pressure stays moderate. Double where the reaction involves toxic, volatile or solvent-based media, or where the vessel cycles between vacuum and pressure and any leakage to atmosphere is unacceptable.
When is a double mechanical seal required for a reactor?
Whenever leakage to atmosphere must be kept to an absolute minimum, or the batch involves hazardous solvents, toxic intermediates or vacuum distillation stages where a single seal can't hold a reliable barrier.
Does a double reactor seal need a thermosyphon pot?
Most liquid-lubricated double reactor seals do — the barrier fluid has to circulate, stay cool and stay monitored through every heating and cooling cycle. We supply the pot and the seal as a matched pair.
Can a reactor seal handle both vacuum and pressure in the same batch?
Yes, provided it's designed for that swing from the start. Tell us the full pressure and vacuum range the batch goes through — not just the nameplate rating — and we'll size the seal for the worst condition, not the average one.
What is a dry-running reactor seal used for?
It's used where the process fluid presents little to no risk to the environment and no liquid reaches the faces — typically top-entry reactors running above the batch level. Face material and temperature decide whether a dry-running design will hold up.
Can a reactor seal be fitted to a glass-lined reactor?
Yes. Glass-lined reactors have fixed nozzle and manway dimensions set by the vessel manufacturer, so send us the nozzle drawing and existing seal details and we'll build the seal to match rather than asking you to modify the vessel.
What is a horizontal-mount entry reactor seal?
A seal fitted where the shaft enters through the side wall of a horizontal reactor or kettle, rather than from the top or bottom. Radial loading and product level at the seal drive the design.
Can you manufacture a replacement from an old seal or sample?
Yes. We regularly develop replacements from a worn sample, a dimensional drawing, or even good photographs plus the equipment details and batch conditions.
Which materials are used for reactor seals?
Carbon, silicon carbide and tungsten carbide for the faces; SS 316/316L for metal parts; FKM, EPDM, PTFE or FFKM for the secondary seals, chosen for solvent and temperature compatibility across the full batch cycle.
Why does my reactor seal keep failing after a few batches?
The usual causes: the seal was sized for average conditions instead of the worst pressure/vacuum/temperature swing in the batch, thermal fatigue from repeated heating and cooling, barrier-pressure problems, or the wrong face material for the solvent. Send us the batch profile and failure history and we'll identify the likely cause before quoting a replacement.
What is the price of a reactor mechanical seal in India?
It depends on reactor type, single or double configuration, entry position, materials and any barrier-fluid system — there's no standard price list. Send your reactor and batch details for a specific quotation.
How long does a custom reactor seal take to manufacture?
Typically [X–Y weeks] depending on materials and complexity. Repeat orders against an approved drawing ship faster. Share your required date with the enquiry and we'll confirm.
Do you supply reactor seals outside Mumbai?
Yes — we supply across India [and export to the Middle East, Africa and Southeast Asia].
What details do you need for a quotation?
Reactor type, capacity, entry position, shaft diameter, nozzle dimensions, design pressure/vacuum, temperature profile, process media, batch cycle and existing seal details. See the table above — and if some of it is missing, send photos and we'll work from there.
Request a Quote for a Reactor Mechanical Seal
New reactor, existing vessel, or a seal that keeps failing after a handful of batches — send us the vessel drawing, existing seal details and full batch profile. Our engineers will review the application and recommend the seal configuration, materials and support arrangement, with a quotation to follow.