what are steam suction systems in solvent tanks?

what are steam suction systems in  solvent tanks?
vacuum vapor degreasers today have significantly improved and replaced the traditional open tank vapor degreasing method by placing the process in a closed vacuum environment using a programmed series of heated steam and cold solvent sprays. emissions are virtually eliminated.
this cleaning sequence primarily allows solvent vapors to be drawn into all areas of the parts and load, including blind holes, crevices, and hard-to-reach places such as inverted "cups". due to the vacuum nature of the process, there are no air "bubbles" to interfere with solvent vapors reaching all surfaces in these tight spaces. as the solvent vapors condense on the part surfaces, the surface temperature rises and the effect of steam cleaning decreases. at this point, cold solvent is sprayed onto the parts to lower the surface temperatures and wash the parts. when the spraying phase is over, additional heated steam is fed back into the cleaning chamber and steam cleaning is restarted. this sequence can be repeated several times.
features of vapor suction systems in  solvent tanks
a typical sequence consists of three two-minute vapor phases and several (2 – 3) thirty-second spray phases. this sequence provides a method of applying only freshly distilled solvent to all surfaces being cleaned, rather than creating a cross-contamination situation as is often the case with solvent dip cleaning. additionally, the use of sequential steam and spray reduces the volume of solvent sent to distillation. distilled low volume dirty cleaning solvent greatly reduces the amount of energy used to distill and concentrate the solvent, resulting in lower initial equipment and operating costs.

the sequential steam jet technique is plc managed and is variable in time, temperature and frequency, meaning it is possible to "custom" design a cleaning process for the particular part and configuration being cleaned. because cleaning is done in a closed chamber, the spray function can be designed to be mild to very aggressive, and since the total volume of solvent used is smaller than with immersion methods, this technique actually provides more cycle time to devote to actual cleaning.
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