Claims
- 1. A filtration device for oils used as the operating fluid in vacuum pumps, and adpated to be directly connected to the vacuum pump for either continuous or discontinuous operation, comprising as its essential components:
- a filter of the tangential-flow type, wherein the filtering element has a tubular shape and pores having a diameter less than 0.4 micron including means for enabling the oil to be filtered to flow inside the tubular element; and
- means for maintaining an adequate tangential speed of the oil on the filtering surface and of keeping the oil at a pressure higher than the pressure outside the tubular element including a circulation pump.
- 2. A device of claim 1, wherein the filtering element is porous polypropylene.
Priority Claims (2)
Number |
Date |
Country |
Kind |
22145 A/85 |
Sep 1985 |
ITX |
|
20080 A/86 |
Apr 1986 |
ITX |
|
Parent Case Info
This is a division of application Ser. No. 904,355 filed Sept. 8, 1986, now U.S. Pat. No. 4,734,207.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4045341 |
Tsuruta et al. |
Aug 1977 |
|
4572783 |
Watson |
Feb 1986 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
904355 |
Sep 1986 |
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