Fluid handling – Back flow prevention by vacuum breaking – Air vent in liquid flow line
Patent
1984-08-14
1986-11-25
Michalsky, Gerald A.
Fluid handling
Back flow prevention by vacuum breaking
Air vent in liquid flow line
137107, 137238, 13724733, F16K 2400
Patent
active
046242791
DESCRIPTION:
BRIEF SUMMARY
The invention refers to a tube separator or backflow preventing device of the kind having a housing with an inlet, an outlet and a separating chamber connectable with the drain and a shutoff member connecting the inlet with the outlet in a first position thereof and separating the inlet from the outlet and connecting the outlet with the separating chamber in a second position.
A tube separator of this kind is for example known from the DE-AS No. 27 59 174. If in this known tube separator the separating member is moved from the first position into the second position, then the separating chamber defined by the housing and the separating member is connected with a drain for draining fluid into a gully or the like. In this position of the separating member the separating chamber is directly connected with the environment via the drain such that contaminations and/or bacteria may arrive at the separating chamber. This danger is aggravated by the fact that the volume of the separating chamber is enlarged and hence air is sucked from the environment during the movement of the separating member into the second position. In a following movement of the separating member into the flow-through position these contaminations and germs will enter the line system in which the tube separator is mounted.
It is the object of the invention to provide an improved tube separator. In particular the entry of contaminations into the tube separator shall be avoided. Furthermore, the structure of the tube separator shall be simple and space-saving.
This object is achieved by a tube separator of the above mentioned kind which according to the invention is characterized in that the separation chamber is structured to be tightly sealed against contaminations.
Further advantages of the invention are presented in the subclaims.
Further features and advantages of the invention will stand out from the description of embodiments in connection with the Figures, in the Figures:
FIG. 1 is a sectional view of a first embodiment of the inventive tube separator with the shut-off member in the first position; and
FIG. 2 is a sectional view of a second embodiment of the inventive tube separator with the shut-off member in the second position.
The tube separator 1 comprises a housing 2 with a first cylindrical portion 3 and a second cylindrical portion 4. An inlet 5 to be connected with a tube is provided on one side of the housing 2 between the first cylindrical portion 3 and the second cylindrical portion 4, and an outlet 6 to be connected with a tube is provided at the opposite side of the housing 2 between the first cylindrical portion 3 and the second cylindrical portion 4. On the respective front side opposite to the inlet 5 and the outlet 6 the first cylindrical portion 3 is closed by means of a cap 7 and the second cylindrical portion 4 is covered by means of a plate 8 comprising a drain opening 9.
A shut-off member formed as a slide valve 10 having a piston area 12 at the end 11 thereof which projects into the first cylindrical portion 3 is provided between the inlet 5 and the outlet 6. The piston area 12 divides the space defined by the housing 2, cap 7 and plate 8 into a cylinder space 13 and a separating chamber 14. The slide valve 10 is movable in a direction transversally to the connecting line between inlet 5 and outlet 6 between a first position and a second position in dependence on the pressure within the cylinder space 13.
The slide valve 10 comprises a connecting channel 15 which is connectable with the inlet 5 and the outlet 6 in the first position of the slide valve shown in FIG. 1, as well as an opening 17 connected with the separating chamber 14 via a bore 16 within the slide valve 10. The connecting channel 15 and the opening 17 are designed such that in this first position the inlet 5 and the outlet 6 are connected with each other via the connecting channel 15 and in the second end position of the slide valve 10 the inlet 5 is closed by the slide valve 10 and the outlet 6 is in connection with the separating chamber 14 via
REFERENCES:
patent: 246193 (1881-08-01), O'Grady
patent: 2588284 (1952-03-01), Otis
patent: 4232704 (1980-11-01), Becker et al.
patent: 4241752 (1980-12-01), Ackroyd
Arens Hans
Haslberger Richard
Kern Hans
Brown Donald
Gammons Robert T.
Grunbeck Wasseraufbereitung GmbH
Michalsky Gerald A.
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