Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1984-08-10
1986-06-17
Cohan, Alan
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
13762566, 13762568, 251195, 251172, F16K 1106
Patent
active
045950318
DESCRIPTION:
BRIEF SUMMARY
The invention refers to a tube separator comprising a housing having an inlet connection and an outlet connection, and a member being disposed within the housing and slidable between a first and a second end position and which comprises a channel extending through the member from an entrance opening to an exit opening and an area on which the pressure in the inlet connection may act upon, and a spring acting upon the member in a direction opposite to the action of the inlet pressure, whereby the channel forms a connection between the inlet and the outlet connection in the first end position and the member separates the inlet connection from the outlet connection in the second end position, the entrance opening and the exit opening each comprising a respective straight secant, the respective secants being parallel to each other.
A tube separator of this kind is known from the DE-AS 2759174. In this known tube separator the fluid passes in longitudinal direction of the member in the first position thereof, in which it forms a connection between the inlet connection and the outlet connection. The movement into the second position, in which the inlet connection is separated from the outlet connection, is performed by displacing the member in longitudinal direction thereof. In this second position the one side of the channel opening is closed, whereas the other side is connected to the environment via a drain conduit. Hence this solution raises the problem that in the second end position of the member the channel is ventilated and after switching into the first position the enclosed air is pressed into the water line. This problem is aggravated by the fact that the passage or channel in the member has a relatively large volume due to the principle of longitudinal displacement of the member, which leads to a relatively large volume of the enclosed air. Furthermore, in this known solution the number of sealing elements being in engagement between the displaceable member and the housing varies according to the position of the member, which may cause a sticking of the member in an intermediate position due to varying friction conditions along the way of displacement.
It is the object of the invention to provide an improved tube separator. In particular the air input into the conduit system shall be kept as small as possible. Furthermore, a safe function of the tube separator shall be ascertained without there being a possibility of sticking of the tube separator.
This object is achieved by a tube separator of the above mentioned kind, which according to the invention is characterized in that the channel extends transversely through the member and the member is displaced in a direction transversely to the axis of the channel and the axis of inlet and outlet connection.
Preferably the member is designed as flat slide valve, wherein the seal between the housing and the member or the channel within the member, respectively, is preferably obtained by flat ceramic gaskets. In order to keep the displacement of the member as small as possible the entrance and exit openings may have a smaller dimension in the direction of displacement than for example transversely thereto.
To improve the reaction of the tube separator a control valve may be provided having a first position in which it allows the area of the member, on which the pressure may act upon and which is preferably designed as flange or piston, to be acted upon by the fluid pressure in the inlet connection, and changing-over into a second position, if this pressure falls below a preadjusted value, and allowing the area of the member to be acted upon by a lower pressure, preferably environmental pressure, in this second position. The fluid volume to be removed by the displacement of the member may be expelled via a channel provided within the member itself and through a drain opening at the housing. Preferably the control valve is designed adjustable such that the change-over pressure of the tube separator is adjustable to e.g. a varying building height.
Further feat
REFERENCES:
patent: 2394487 (1946-02-01), Rother
patent: 2474772 (1949-06-01), Ashton
patent: 2705020 (1955-03-01), Frantz
patent: 3006599 (1961-10-01), Eckert
patent: 3324888 (1967-06-01), Henderson
patent: 3614061 (1971-10-01), Fitzpatrick
patent: 4340203 (1982-07-01), Donner
patent: 4458879 (1984-07-01), Jandrasi
Arens Hans
Haslberger Richard
Kern Hans
Brown Donald
Cohan Alan
Gammons Robert T.
Grunbeck Wasseraufbereitung GmbH
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