Flagship Product
India's original rotary vane vacuum pump with Once Through Lubrication. Achieves and maintains consistent deep vacuum throughout the process, with no drop, while handling corrosive, solvent, and aggressive vapors.
The Technology
Every design decision in the OTL™ series traces back to three physical facts about vapor and corrosion that conventional pump designers ignored.
Whenever any material is in vapor stage, its corrosive properties are drastically reduced. OTL™ maintains an operating temperature of 50-70°C so that vapors sucked in remain in vapor form throughout their stay in the pump, and are exhausted without ever condensing.
Whenever condensation of vapors occurs inside a vacuum pump, maximum corrosion of components takes place. OTL™'s first stage is positioned on top of the second stage so any condensate drains by gravity when stationary, and is continuously expelled during operation.
Corrosive vapors contaminate lubricating oil badly. In conventional pumps, this contaminated oil keeps recirculating, degrading both vacuum performance and pump internals. In OTL™, fresh oil is continuously injected and expelled, never recirculated.
Construction
Top stage (connected to plant) sits above bottom stage (exhaust stage). This gravity-drain layout prevents condensate accumulation and the corrosion it causes.
Four independent plunger pumps continuously inject fresh oil from a 23-litre tank (220-330 ml/hr depending on model) for lubrication and sealing. Contaminated oil exits via the exhaust.
A 100-litre water tank with a 1 HP radiator fan maintains 50-70°C operating temperature. Water never contacts process vapors. Coolant can be added to reduce topping-up frequency.
Heat-treated toughened phenolic fiber vanes withstand aggressive solvents, methanol, EDC, MDC, toluene, xylene, benzene, hexane, with minimal stator wear. Replaceable without disturbing motors or pipelines.
Viton oil seals for long life, which are compatible with most vapors. Bearings are filled with high melting point grease.
Stator, rotor, and end covers are cast iron. With proper operating procedure (warm-up and air bleeding after each batch), cast iron components deliver long service life even with corrosive vapors, with economical and minimal maintenance.
Product Range
Four standard models for plant/large-scale applications. All models share the same OTL™ technology and are fully serviced from Thane, Maharashtra.
Entry-level industrial
Mid-range industrial
High-capacity industrial
Large-scale industrial
All OTL™ models share these specifications:
Applications
Ideal for high vacuum applications in the 5-0.1 torr range where consistent vacuum and vapor handling are non-negotiable.
OTL™'s zero oil-contamination design is critical for API quality. No recirculated oil means no risk of cross-contamination into your active pharmaceutical ingredient. 3,000+ pharma installations across India.
Consistent vacuum throughout the drying cycle means lower operating temperatures, reduced batch times, and no product degradation. OTL™ maintains vacuum even under high solvent vapor loads at the start of a batch.
OTL™ handles methanol, EDC, MDC, toluene, xylene, benzene, hexane vapors without condensation in the internals. Solvent flushing procedure available for powder trace removal.
Used as vacuum source for fluid bed dryers and coating pans. Reliable vacuum maintenance ensures consistent granule quality batch after batch.
Ideal for high vacuum distillation in the 5-0.1 torr range. Lower boiling points under vacuum reduce thermal degradation of heat-sensitive products. OTL™ maintains these pressures consistently, without the boiler a steam ejector would require.
Many synthesis reactions require controlled vacuum to manage reaction equilibria and remove volatile by-products. OTL™'s stable vacuum eliminates the vacuum drop that derails sensitive reactions.
Extraction and concentration of natural compounds at low temperatures. OTL™'s clean, oil-free process stream protects product integrity, no oil migration into your flavour compounds.
OTL™ was specifically designed as a low-cost replacement for steam jet ejector systems. Remove your boiler dependency entirely, most customers recover the investment within 12-24 months from energy savings alone.
Conventional SS 316 pumps fail in corrosive vapor service, not because they corrode, but because the friction between working parts causes seizure. OTL™'s cast iron construction with proper operating procedure (warm-up + air bleeding after each batch) outperforms expensive SS alternatives.
The key is operating temperature: at 50-70°C, corrosive vapors remain in vapor form throughout their transit through the pump and exit without ever condensing onto metal surfaces.
Methanol, EDC, MDC, toluene, xylene, benzene, hexane, acidic vapors, water vapor, aggressive solvents
15-minute warm-up before connecting to plant. 3-minute air bleed after each batch. Solvent flush if powder traces are present.
Maintenance
OTL™ pumps were designed so that vanes and bearings can be replaced in a short time without disturbing motors, process pipelines, or electricals. Your maintenance crew will find routine jobs straightforward.
Comparison
| Criterion | OTL™ Pump | Dry Screw Pump | Oil Sealed Pump | Steam Ejector |
|---|---|---|---|---|
| Ultimate vacuum | ≤ 1 mmHg | 0.1 torr | Degrades over time | Narrow range only |
| Oil contamination | None | None | High risk | None |
| Boiler required | No | No | No | Yes, major cost |
| Energy cost | Low | Low | Moderate | Very high |
| Corrosive vapors | Handled | Handled | Causes seizure | Limited |
| Effluent / pollution | Minimal | Minimal | Oil mist exhaust | Creates effluent |
| Spares availability | Same day (Thane) | Long wait time | Regular | Varies |
| Cost of purchase | Economical | Extremely expensive | Affordable | Expensive |
| Cost of maintenance | Economical | Extremely expensive | Economical | Expensive |
Ready to specify OTL™ for your process?
Bring your target vacuum level (torr or mbar), process type, and vapor load estimate. Our engineers will size the correct OTL™ model and walk you through the installation requirements.
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