Steam Jet Ejector Manufacturer — Primetech, Chennai, India
Single Stage Steam Jet Ejector (Z-Stage)
Primetech manufactures single stage steam jet ejectors for vacuum ranges of 100 to 400 Torr absolute. The Z-stage ejector uses high-pressure motive steam through a convergent-divergent nozzle to entrain and compress suction gases. Applications include condenser air extraction in power plants, degassing of boiler feed water, priming of centrifugal pumps and general vacuum generation in chemical plants. No moving parts ensure 100% uptime in continuous industrial service. Available in carbon steel, stainless steel 304, stainless steel 316 and special alloys for corrosive gas service.
Two Stage Steam Jet Ejector (YZ-Stage)
Two stage steam jet ejectors with inter-condenser achieve vacuum of 25 to 300 Torr absolute. The YZ configuration uses a first stage Y-ejector to produce initial vacuum, with the steam and gas mixture then condensed in an inter-condenser before the Z-stage final ejector. This reduces steam consumption and vapour load on the second stage. Widely used in power plant condensers as holding ejectors, vacuum distillation units in petroleum refineries and chemical plants, evaporation systems in food and sugar industries, and pharmaceutical vacuum drying.
Three Stage Steam Jet Ejector
Three stage steam jet ejector systems with two inter-condensers achieve vacuum of 5 to 15 Torr absolute. The three stage configuration is required when deeper vacuum is needed than achievable with two stages. Applications include vacuum distillation columns in refineries and chemical plants, vacuum drying in pharmaceutical and specialty chemical manufacture, edible oil deodorisation, and advanced chemical processing requiring deep vacuum. Inter-condensers between stages remove condensable vapours to reduce steam consumption and improve efficiency.
Four Stage Steam Jet Ejector
Four stage steam jet ejector systems achieve maximum vacuum of approximately 0.5 Torr absolute — the deepest vacuum achievable with steam ejectors. Required for ultra-high vacuum applications including lube oil vacuum distillation, freeze drying in pharmaceutical plants, and specialty chemical production. Three inter-condensers between stages progressively reduce the vapour load on each subsequent stage, minimising total motive steam consumption. Primetech designs four stage systems to HEI Standards and customer specifications.
Steam Plus Water Jet Ejector Systems
Hybrid steam plus water ejector systems combine steam ejector stages with a final water jet ejector stage to achieve vacuum of 5 to 150 Torr while reducing total steam consumption. Available in two stage (Y-steam plus Z-water) and three stage (X+Y-steam plus Z-water) configurations. Used in vacuum distillation, edible oil refining, pharmaceutical drying, evaporation and crystallisation. The water jet final stage removes residual vapour load, improving overall system efficiency.
Steam Jet Ejectors
Industrial Vacuum Systems
Single to four-stage steam ejector configurations, with optional inter-condensers, engineered for vacuum ranges from 400 Torr down to 0.5 Torr absolute.
Primetech Ejectors
How a Steam Jet Ejector Works
A steam jet ejector uses the principle of energy conversion to create vacuum. High-pressure motive steam enters through the steam chest and accelerates to high velocity through a precisely designed convergent-divergent nozzle, creating a low-pressure zone in the suction chamber.
This low-pressure zone draws in the process gas or vapour. The entrained mixture then enters the diffuser, where velocity energy is progressively converted back into pressure, raising the mixture to discharge pressure.
Key advantages:
No moving parts — zero mechanical wear, minimal maintenance
Handles corrosive, condensable, and particle-laden gases
Simple construction from a wide range of materials
Suitable for continuous, uninterrupted service
Scalable — stages can be added in series for deeper vacuum
Multi-effect Evaporators, Condensable Vapour Removal, Power Plants
Pharmaceutical Processing, Edible Oil Deodorization, Advanced Chemical
Specialty Chemical Production, High-Efficiency Distillation, Advanced Vacuum Drying
Inter-condenser
Not applicable
Optional / Recommended
Recommended
Required for efficiency
Steam Consumption
Lowest
Moderate
Higher
Highest
Z-Stage Ejector
Single Stage Steam Jet Ejector
⬥ Vacuum: 100 – 400 Torr
A single-stage ejector uses one ejector unit that generates vacuum by using high-velocity motive steam to entrain and remove gases or vapours from a system. When discharging to atmosphere, it achieves suction pressures of approximately 100–400 Torr.
Its simple design, dependable operation, and ability to handle corrosive or contaminated gases make it widely applicable in industrial processes where moderate vacuum is sufficient.
Applications
Condenser air extraction — removes non-condensables from steam condensers in power plants
Degassing operations — removes dissolved gases from boiler feed water
Priming of centrifugal pumps by removing air from suction lines
YZ-Stage Ejector
Two Stage Steam Jet Ejector
⬥ Vacuum: 25 – 300 Torr
Two ejectors in series: the first stage produces an initial vacuum (60–300 Torr), while the second stage reduces it further to approximately 25–100 Torr. An optional inter-condenser between stages condenses first-stage steam, reducing the vapour load and improving efficiency while lowering steam consumption.
Available with or without inter-condenser (Y+Z), depending on operating conditions and steam economy requirements.
Applications
Power plant condensers — maintaining vacuum and removing non-condensables
Vacuum distillation units — chemical and petroleum refineries
Evaporation systems — food, sugar, and chemical industries
Pharma drying units — vacuum drying where steam economy is important
3-Stage Ejector
Three Stage Steam Jet Ejector
⬥ Vacuum: 5 – 15 Torr
Three ejector units connected in series progressively reduce pressure, enabling the system to handle larger gas loads while achieving lower absolute pressures. Inter-stage condensers reduce vapour load between stages, decreasing steam consumption and enhancing overall efficiency.
This configuration is especially beneficial when processing condensable vapours, as encountered in distillation and evaporation operations.
Applications
Vacuum distillation — petroleum refineries and chemical plants
Vacuum drying — pharmaceutical, chemical, and specialty materials
Chemical processing — reactors requiring very low-pressure conditions
4-Stage Ejector
Four Stage Steam Jet Ejector
⬥ Vacuum: ~0.5 Torr absolute
Designed for applications requiring extremely low pressures not achievable with fewer stages. Four units in series progressively reduce pressure while efficiently removing large volumes of gases and vapours, making it suitable for the most demanding industrial operations.
Inter-stage condensers remove condensable components between stages, reducing energy consumption and improving efficiency. Suitable for high-vacuum processes such as vacuum distillation, evaporation, and specialty chemical processing.
Applications
Vacuum distillation — petroleum refineries and chemical plants
Power plant condenser systems — extracting non-condensables at very low pressure
Vacuum drying — pharmaceutical, chemical, and specialty material production
Chemical processing — reactors needing extremely low-pressure conditions
Four-stage systems can be supplied with or without inter-condensers depending on process requirements, gas composition, and desired steam economy. Our engineering team sizes each system based on the specific suction load, motive steam pressure, and discharge conditions.
Steam + Water System
Steam + Water Jet Ejector Systems
⬥ Vacuum: 5 – 150 Torr
Hybrid systems combining steam ejectors with a water jet ejector as the final stage. The water jet reduces the overall vapour load and enhances vacuum performance while decreasing steam consumption.
2-Stage: Y-Stage Steam + Z-Stage Water
Steam first stage produces initial vacuum. The water ejector final stage removes remaining vapour, reducing system load. Suction pressure below 150 Torr, reaching approximately 15 Torr under suitable conditions.
3-Stage: X & Y Steam + Z-Stage Water
For deeper vacuum requirements. Can achieve 5–15 Torr. The additional steam stage extends the vacuum range significantly before handing off to the water ejector.
