Wittig and Elmo Rietschle supply oil lubricated and dry running rotary vane vacuum pumps and compressors as well as complete systems for a wide range of centralized vacuum systems. Typical applications are
- Handling and holding
- Vacuum to draw off gases
- Vacuum for various processing steps such as soldering/brazing
- Evacuation of containers
Wittig series WPSO vacuum pumps offer the world's most durable and efficient solution to vacuum generation in the bottle glass industry. The WPSO series has by far the lowest life cycle costs for glass plants.
Elmo Rietschle vacuum systems for hospitals were designed specifically for this application. Reliability and freedom from outages have top priority when it comes to designing these systems. In addition, the operator receives all the relevant process data via a Modbus RTU interface. If needed, remote control and monitoring of the system can be handled from a central control room.
Our central vacuum systems
- Meet the requirements of 93/42/EEC
- Are CE-certified for medical devices
- Fulfill the requirements of ISO 7396-1
The systems can be installed and operated in hospitals without additional testing
The high quality standards that apply to chemical and pharmaceutical industrial manufacturing set the bar as high as possible when it comes to manufacturing and planning. The high level of satisfaction on the part of our long-standing customers is based on our decades of engineering experience. In applications in which highly explosive gas mixtures are extracted, in low and high vacuum zones of vacuum drying systems, in the vacuum distillation of solvents and in vacuum crystallization filtration our products are the first choice for customers around the world.
When industrial surfaces are coated, metal vapors are handled under vacuum. In typical processes the metal condenses as a thin layer on the surface of the substrate. Vacuum is necessary to keep the metal vapours under pressure.
Extruders are typically used for product degassing. In extruders highly viscous substances are compressed and simultaneously freed of solvents. The vacuum pump used serves exclusively to evacuate low boiling point solvents as well as any air that has entered the material through leaks.
Many products are dried before entering the marketplace. Solvents are removed from the product in heatable static or dynamic dryers. The advantage of vacuum drying is that the product can be processed at low temperatures.
Impregnation involves the following process: the final product is evacuated in a receiving vessel. A suitable impregnating agent, such as a resin, penetrates the surface of the material under vacuum.
Thin Layer Evaporation
This process, which is also called molecular evaporation, is used to separate substances that have narrow boiling point ranges. This type of equipment has a special design that only operates properly at specific vacuum levels.
Vapor recovery is used in the chemical process industry to remove and recover vapors from storage tanks. The vapors are usually either environmentally hazardous, or valuable to be recovered. The process consists of a closed venting system from the storage tank ullage space to a vapor recovery unit (VRU) which will recover the vapors for return to the process or destroy them, usually by oxidation.
The biomass produced in activated sludge and clarifying tanks is stabilised in the digestion tower and used to produce biogas. A thorough mixing of the sludge increases the gas yield and reduces its retention time in the reactor. During the process, gas is withdrawn from the upper part of the digestion tower, compressed and reintroduced through the nozzles at the bottom.
Distillation / Solvent Recovery
Wastewater that is contaminated with solvents must be treated for environmental reasons. The simplest method is vacuum distilling, where the low boiling point fraction is evaporated and then condensed. The wastewater is then transported elsewhere for further use.
Filling and Closing Machines
When bottling beverages, cosmetic or pharmaceutical products, the bottle is first evacuated before being filled to make sure the product reaches the customer in good quality.
Air, water vapour, fat and spice mixtures are evacuated using vacuum pumps. Because of higher requirements for quality of food with regard to flavour, colour, homogeneity and durability, meat processing uses more and more vacuum, too, e.g. in filling machines, tumblers and cutters.
Concentration systems are used to concentrate a food product (for instance tomato sauce), which is normally diluited into a solution. The concentration process is basically a thermal process for removing and exctracting the lighter compounds and concentrate the heavier. Vacuum pumps are normally used to generate vacuum for lowering the product boiling point of this thermal process, saving energy and preserving food quality. Centrifugal pumps are used to transfer the condensate resulting from concetration process.
Degassing Mineral Water
In mineral water production systems, vacuum pumps can be used to provide vacuum in order to remove oxygene from the water and saturate it with carbon dioxide.
Vacuum systems are used to obtain a compact mixture without air bubbles, with a perfect cut of the product, best colour and maintenance.
Removal of Impurities
Pulp products such as tomato or fruit pulps needs to be cleaned from impurities. Selecting equipments used to intercept and remove impurities from food pulp are coupled with vacuum pumps or vacuum blowers in order to provide the vacuum required for sucking impurities.
Vegetable Oil Refining
Vegetable oil refining consists of a series of processes (chemical neutralization, bleaching and deodorizing) which generates the vast majority of oil used in industries such as food, pharmaceuticals and cosmetics.
In the case of recycled material, vacuum pumps remove air inclusions, moisture and adhesives from the molten plastic. They extract all the low molecular substances in order to obtain the optimum quality, i.e. a smooth surface, high strength, better insulation properties and a lower out gassing rate, resulting in recyclable material which achieves the same level as new material.
Production units for rubber parts used in the automobile industry require vacuum to evacuate the die casting moulds, to avoid air bubbles and to accelerate the rubber mass.
Solid State Polymerization
Solid State Polymerization (SSP) is a process in which the polymer chain lengths are increased by heat in the absence of oxygen and water, by means of either vacuum or purging with an inert gas to drive off the by-products of reactions. The reaction is driven by temperature, pressure, and the diffusion of by-products from the interior of the pellet to the surface. SSP is an important step frequently used after melt-polymerization for the purpose of enhancing the mechanical and rheological properties of polymers before injection blow molding or extruding. The SSP technique is widely applied in the industrial manufacturing of bottle grade PET, films and superior industrial fibres.
Condenser exhausting involves the removal of air and other non-condensable gases from the steam space of power plant condensers. The purpose of removing these gases is to maintain the lowest possible turbine backpressure. The equipment used for this application is crucial to the efficient operation of fossil fuel and nuclear power plants.
Production of Distilled Water
Distilled water is water that has been boiled in an apparatus called a "still" and then recondensed in a cooling unit ("condenser") to return the water to the liquid state. Distilling is used to purify water. Dissolved contaminants like salts are left behind in the boiling pot as the water vapor evaporates.
Vacuum systems allow to obtain a compact mixture, without air bubbles, with a perfect cut of the product.