Fluid handling – Back flow prevention by vacuum breaking – Air vent in liquid flow line
Patent
1984-08-14
1986-03-04
Michalsky, Gerald A.
Fluid handling
Back flow prevention by vacuum breaking
Air vent in liquid flow line
137107, 137486, E03C 110
Patent
active
045734917
DESCRIPTION:
BRIEF SUMMARY
The invention refers to a tube separator or backflow preventing device, respectively, according to the preamble of claim 1.
A tube separator of this kind is known from the DE-OS 2747941. This known apparatus uses a differential pressure measuring device, the one side thereof being permanently acted upon by the inlet pressure and the other side thereof being permanently acted upon by the outlet pressure of the tube separator. Hence, if the medium flow rate through the tube separator and thus the pressure difference between the inlet and outlet pressure drops below a certain value, it may be caused that the tube separator will shut off and will instantaneously open again due to the increasing pressure difference resulting from the shut-off.
It is the object of the invention to provide an improved tube separator. In particular change-over oscillations shall be avoided, particularly for low flow rates.
This object is achieved by a tube separator of the above mentioned kind, which according to the invention is characterized by the features of claim 1.
Further advantages of the invention are characterized in the sub-claims.
Further features and advantages of the invention will stand out from the description of an embodiment in connection with the Figures. In the Figures:
FIG. 1 is a sectional view of a tube separator with shut-off means, control valve and valve in their respective first position;
FIG. 2 is an enlarged sectional view of the valve in the second position; and
FIG. 3 is a sectional view of the valve in the first position.
The tube separator or backflow preventor 1, respectively, comprises an inlet 2 and an outlet 3, the inlet and outlet being each connectable with a respective tube. A slide valve 4 having a connecting channel 5 which may be connected with the inlet 2 and the outlet 3, is provided between the inlet 2 and the outlet 3. The slide valve and the connecting channel are designed such that the inlet 2 and the outlet 3 are connected with each other in the first position shown in FIG. 1 and separated from each other in the second position of the slide valve 4, in which the same is displaced transversely to the connection line of inlet 2 and outlet 3. Suitable gaskets formed as cooperating flat slide valve gaskets 6, 7 with respective ring gaskets are provided for sealing between inlets 2 and slide valve 4 and slide valve 4 and outlet 3, respectively. The flat slide valve gaskets 6, 7 are designed as ceramic plates or ceramic washers, respectively.
One end 8 of the slide valve 4 extends into a cylinder 9 in which the slide valve 4 may reciprocally slide as a piston 10 in dependence on the pressure prevailing within the cylinder.
The interior of the cylinder 9 is connectable with the inlet 2 via a control valve 11 and a connecting conduit 12. The control valve 11 comprises a valve chamber 13 having a first section 14 and a second section 15. The inlet of the first section is connected with the connecting conduit 12 forming the first inlet of the control valve 11, and the outlet of the first section is connected with the second section 15. The second section is formed as a bore having the end thereof turned away from the first section opening into a bore 16 of the slide valve 4. The bore 16 leads into the environment or into a space 18 in which the environmental pressure or at least a pressure prevails which is below the pressure prevailing at inlet 2 when the flow medium acts thereon, via an exit bore 17.
Furthermore, the second section 15 is connected with the interior 21 of the cylinder 9 via cross-bores 19, 20. The second section 15 comprises valve seats 22, 23 at the end thereof facing the first section as well as at the end thereof facing the bore 16. A valve rod 24 is provided which passes through the second section 15 and which comprises the valve body 25 at the end thereof turned away from the first section and a second valve body 26 in a distance from the valve body 25 which is larger than the distance between both valve seats 22, 23. As may be seen from FIG. 1 the surface area 27 of t
REFERENCES:
patent: 2588284 (1952-03-01), Otis
patent: 4249556 (1981-02-01), Waletzko
Arens Hans
Haslberger Richard
Kern Hans
Brown Donald
Grunbeck Wasseraufbereitung GmbH
Michalsky Gerald A.
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