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. The valve has an exteriorly threaded valve body with an axially extending flow passage. A first axial extension on the valve body has a smaller diameter than the valve body proper. The valve body has a plane end surface forming a valve seat surrounding the flow passage. An exteriorly threaded cylindrical closure body of the same diameter as the valve body and having a second axial extension of smaller diameter is included in the valve. A spring engages the threads of the valve body and closure body to urge the end surface of the closure body against the valve seat. The closure body is adjustable relative to the valve body for adjusting spring tension and valve operational limits.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of U.S. application Ser. No. 526,314, filed on Nov. 22, 1974, now abandoned, which in turn, was a divisional of application Ser. No. 321,970, filed on Jan. 8, 1973.
A method for expansion control in a closed fluid circulation system with varying temperature, in which system air is drawn from the circulating fluid through the formation of an air head wherein air to be withdrawn is collected and from which air can be blown off, controlled by a valve, to the environment or a receiving space, while further off, measures are taken for taking up, when the temperature varies, an attendant expansion and shrinking of the fluid within the closed system, and measures for enabling adding fluid to the system, which fluid is withdrawn from an external stock of fluid under pressure, and the air head volume is measured and when a predetermined value is exceeded, a fluid valve is opened through which fluid is introduced into the air head until the volume of the air head is substantially equal to the predetermined value and the fluid valve is closed.
An apparatus for venting and/or degassing a pipeline system includes an upwardly extending casing formed of a top part and a bottom part with a cap located within the casing and extending transversely of the upward direction in the region where the top part is connected to the bottom part. A valve is located in the upper end of the top part and has a horizontally extending valve needle projecting into the interior of the casing. A float needle is located within the top part of the casing and is in interengaged contact with the valve needle. A float is freely slidable on the float needle between the cap and the upper end of the casing. The top part of the casing and the float needle are dimensioned so that the float can move upwardly and downwardly on the float needle from the region of the cap toward the valve needle so that during a pressure increase within the casing up to a predetermined value there will be an accurate safety dimension maintained between the liquid surface in the casing and the valve. To prevent damage to or contamination of the valve, it is provided with a labyrinth outlet port.
In a spring-loaded valve, a coil spring functions not only to bias a valve member toward its seat but also to retain the valve member in assembly with the valve.
Disclosed is a novel gas-liquid separating apparatus which is installed directly on a hot-water heating line independently from a gas boiler. The gas-liquid separating apparatus has a body provided with an air vent hole opened to outside, wherein the liquid flows, and a bubble collecting device for collecting the bubbles from the liquid to vent out the collected bubbles through the air vent hole. The bubble collecting device has a plurality of cylindrical bubble collecting rods for collecting bubbles contained in the liquid, a round projected portion for supporting upper portions of the bubble collecting rods, the round projected portion having a space portion for collecting bubbles collected by the bubble collecting rods being supported by the air vent hole and a conical vent portion having a conical space portion connected to the space of the round projected portion. At an upper portion of the conical vent portion, an air vent for venting out the bubbles is mounted. Small bubbles contained in the hot water generated by a gas boiler are collected by the bubble collecting device. Small bubbles are combined with each other and continue to grow in size. Grown bubble ascends by self buoyancy to be vented through the air vent hole.
A method and apparatus for deaerating a liquid in a substantially closed liquid circulation system, wherein an amount of liquid is withdrawn from the circulation system and is introduced into a closed reservoir via a valve which is alternately open and closed, wherein by a pump which is operative in the open as well as the closed positions of the valve an underpressure can be created in the reservoir for the purpose of deaerating the liquid, and the liquid can be sucked from the reservoir and added to the circulation system again, separated air being discharged via a vent unit to the environment. For the valve adapted to be opened and closed alternately, preferably a throttling valve is used.
