DEVICE FOR VENTING CLOSED WATER CIRCULATION SYSTEMS
this invention. A venting and aerating arrangement for closed flow systems for water of fluctuating temperature is disclosed. A vent casing, defining an air collecting chamber, extends upwardly from a horizontal conduit of the system. A float controlled vent valve is arranged in the upper portion of the casing. A grid of spaced rods is arranged in the junction between casing and conduit and extends into the flow passage of the conduit to break up bubbles of air and other gases with the liberated gas ascending into the air collecting chamber. An improved valve construction is also disclosed. property or privilege is claimed are defined as follows:- 1- In combination with a horizontally extending conduit of a closed flow system, wherein water of fluctuating temperature is pumped and circulated through conduit means and the system is operatively connected to a pressurized water source, a venting and aerating tap comprising:
(a) a vent container extending upwardly from said hori¬ zontally extending conduit and defining a collect¬ ing chamber ; (b) means connecting said chamber and the flow passage of said conduit to form a junction between said conduit flow passage and said collecting chamber; (c) a vent arranged on rsaid vent container and being capable of establishing communication between said chamber and outside air; (d) a float member operatively connected to said vent and located within said chamber and opening and closing said vent in response to the water level in said chamber; and (e) a grid positioned in said junction and extending over at least a portion of the cross-sectional area of said flow passage, said grid being formed from rod or wire means which, as distinguished from fine- mesh sieves, define comparatively large size gaps. 2. A device according to claim 1, wherein said vent container is a cylindrical container having a threaded connection arranged outwardly of the bottom thereof, characterized in that tj..
the passage of said connection is wide enough to ensure that when said vent is closed, the water present in the collecting chamber is not hindered in its outflow by air under atmospheric pressure, an end of said connection being connected by means of a screw joint to said conduit.
3* A device according to claim 1, characterized in that the cross-section of said container is greater than that of said conduit, said container having a surrounding wall connected about an orifice in said conduit. 4• A device according to claim 3, characterized in that said grid extends over the cross-section of the container and projects, at least partially, into circulating water in said conduit.
5- A device according to claim 3 or 4, characterized in that the grid consists of wire rings or semicircular wires arranged parallel to each other in a flow direction.
6- A device according to claim 3, characterized in that the part of the device container which forms the branch to the conduit is separated from that part of the conduit which extends beyond same in flow direfction by means of an inclined lattice formed by horizontal rods, said lattice having an upper side facing the flow of the circulating water in said conduit.
7- A device according to claim 6, characterized in that the thickness of said lattice rods and their distances are dimensioned in such a way that the lower apex of a rod is in a horizontal plane with the upper apex of the neighboring lower rod.
8- A device according to claim 3, characterized in that the lattice consists of several windings of a wire coil spir¬ ally wound on a supporting pipe arranged in the axis of said container and extending between the supporting pipe and the surrounding wall and projecting, at least with one full winding, into the cross-section of the conduit and into that part of the container which forms the branch of the flow system. 9. A device according to claim 8, characterized in that said supporting pipe extends to the liquid level in the container and its lower inclined end, which projects beyond said wire coil, is facing the water flow with a portion of its inner surface. 10. A device according to claim 8 or 9, characterized in that said supporting pipe serves as a surrounding guide for a part of a projection of said float. 11. A device according to claim 1, wherein said vent is an air vent valve consisting of a cylindrical valve body having an axial passage channel and a valve seat surrounding the Inside orifice of the channel/ said valve body being insertable into an opening of said vent container, and a closing body forced against said valve seat by means of a spring, charac¬ terized in that said valve body forms the said valve seat by a flat frontal surface of an inward directed smaller diameter axial projection, said closing body also having a flat frontal surface of a smaller diameter and resting against the valve seat under the force of a tensile spring, said tensile spring being screwed on the threaded outer surfaces of said valve body and said closing body and in direct engagement with the float of said closing body on its end facing away from said valve seat. 12. A valve according to claim 11, characterized in that a gasket made from a resilient material is provided between said flat frontal surface and said valve seat. 13. A valve according to claim 11 or 12, characterized in that said closing body is provided with a float hook suspending device projecting from its end facing away from the valve seat. 14. A valve according to claim 11, characterized in that said float consists of a solid body made from a material having a specific weight smaller than 1.
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