The present invention relates generally to the field of safety devices for the filling and venting of tanks for propane, butane, and other gases that are typically filled while at least primarily in the liquid state. More particularly, the present invention relates to valves and valve bodies in which both fill and pressure relief valves are mounted.
Safe operation of pressurized closed fluid systems requires a careful balance between maintaining the necessary pressure or fluid density to support the application of the system and avoiding exceeding the structural limitations of the system. This balance becomes particularly important when the system is designed for use by average consumers who may not be aware of how to avoid overfilling such a system or understand the risks posed by exceeding the pressure limitations of the system. Examples of such pressurized closed fluid systems include small tanks used to supply pressurized gas to recreational paintball markers and tanks used to store pressurized propane.
Prior propane valve assemblies have been proposed which combine fluid input, pressure relief and liquid overfill features. However, such prior expedients typically require the consumer or operator who is filling the tank through such a valve assembly to manually seal the overfill port in the valve assembly, by way of a bleeder set screw for example, upon completion of the filling process.
A preferred embodiment of a combination valve assembly may comprise a valve housing, overpressure vent valve, fill valve and an overfill seal element. The valve housing member may preferably have a generally right cylindrical shape and include a first end, a second end and a longitudinal axis extending therebetween. The valve housing member typically has a vent valve socket, a fill valve socket and an overflow channel each of which may substantially extend from the second end toward the first end.
The overpressure vent valve may be disposed within the vent valve socket and have a pressure holding and a pressure relief configuration. The overpressure vent valve is typically elastically biased toward its pressure holding configuration. The elastic bias is typically adapted to being overcome by a fluid pressure at the second end in excess of a pre-determined safe value.
The fill valve may be disposed within the fill valve socket and have a fill valve pin actuatable between an open and a closed position. The fill valve allows fluid to flow therethough when the fill valve pin is in its open position. The fill valve is adapted to prevent fluid from flowing therethough when the fill valve pin is in its closed position. The fill valve pin is typically spring biased toward its closed position
The overfill seal element is preferably movable between a fluid sealing position and a fluid releasing position. The overfill seal element prevents fluid from flowing through the overfill channel when in its fluid sealing position and allows fluid to flow through the overfill channel toward the first end when in its fluid releasing position. The overfill seal element is resiliently biased toward its fluid sealing position.
The aforementioned actuation of the fill valve pin toward its open position and movement of the overfill seal element toward its fluid releasing position are preferably configured to both occur in a direction substantially parallel to the longitudinal axis and toward the second end. Thus, such actuation and movement may occur simultaneously by virtue of interaction with respective components of the same fill adaptor.
Further advantages of the present invention may become apparent to those skilled in the art with the benefit of the following detailed description of the preferred embodiments and upon reference to the accompanying drawings in which:
While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and may herein be described in detail. The drawings may not be to scale. It should be understood, however, that the drawings and detailed description thereto are not intended to limit the invention to the particular form disclosed, but on the contrary, the intention is to cover all modifications.
The following description of preferred embodiments generally relates to combined fill and safety vent plugs. Such plugs serve to mount at least vent and fill valves in a single port in a pressure tank. Such plugs also provide for the mounting of dip tubes, when present, in a single port.
With particular reference to the figures, one or more non-limiting embodiments of a combination valve assembly with actuatable overfill relief are shown generally at 100. Embodiments of a combination valve assembly 100 may comprise a valve housing member 102, an overpressure vent valve 104, a fill valve 106, a dip tube 108, an annular seal element 110, a second seal member 112, a guide element 114, an overfill seal element 116 and a seal bias spring 118.
Valve housing member 102 is specially configured to mount an overpressure vent valve vent valve 104 in a vent valve socket 120, the fill valve 106 in a fill valve socket 122, and a dip tube 108 in an overflow channel 124. When certain embodiments are operatively sealingly joined to a mating port in a pressure vessel 126, the functions of filling, venting, dispensing, and overfill prevention are all incorporated into a single plug mounted in a single port. These functions are performed in such a way as to provide safe, simple, and easy filling, use, and refilling of pressure vessels. When used to dispense pressurized fluid for heating or other purposes, the device that consumes the dispensed fluid is typically sealingly joined through external thread 128 to the pressure vessel 126 that holds the fluid. Fluid flow arrow 130 indicates the flow of fluid outwardly through fill valve 106 in response to the opening of this valve (depression of fill valve opening pin 132) by a connection to a device (not shown).
Valve housing member 102 may have a generally right cylindrical configuration according to certain embodiments. A longitudinal axis 134 extends through the valve housing member 102 from normally external end 136 to normally internal end 138. Valve housing member 102 includes an external thread 128 on external portion 140. External thread 128 is adapted to threadably mate with a connection to a device that uses the fluid that is confined in an associated pressure vessel 126. If desired, external thread 128 may also threadably mate with a fill nozzle (not shown), although such a connection with a fill nozzle is often not used. Annular boss 142 serves to limit the depth to which valve housing member 102 may be inserted into a conventional port in a conventional pressure vessel 126. In embodiments where normally interior portion 144 is not threaded, annular boss 142 provides a convenient location for a weld to sealingly join valve housing member 102 to a mating annular wall of an annular port in a pressure tank (see, for example,
The functions of filling, venting, use, and overfill protection in certain embodiments all involve fluid communication through valve housing member 102. Filling involves fluid communication into the interior of a closed pressure vessel from an external source by way of a nozzle (not shown) mated with the exterior portion 140 of valve housing member 102. The nozzle seals to valve housing member 102 upon being inserted into the normally external portion 140 of valve housing member 102 by sealingly engaging annular seal element 110. As illustrated in
Particularly in those embodiments that are intended to be employed in the refilling of pressure tanks, and in other embodiments as well, overfill protection is provided by opening overflow port 146 during a filling operation. In those embodiments where dip tube 108 is inserted into overflow channel 124 and projects downwardly into the interior of a pressure vessel 126 for a predetermined distance, when a full condition exists within the pressure vessel 126, the respective liquid will overflow from the interior of a pressure tank and out of overflow port 146. In embodiments with a spring biased overfill seal element 116, such overflow will only happen while the overflow seal element 116 is forced against the bias of spring 118 and retained thereat. The overflow of liquid out of overflow port 146 also automatically prevents overfilling.
In those embodiments where overflow protection is provided, venting during filling may be provided by overflow out of overflow port 146. In those embodiments where overflow protection is not provided, safety concerns require the presence of a vent system that will be forced open by an amount of pressure within a pressurized tank that exceeds a predetermined amount. Also, all pressurized tanks should have a pressure vent system that will dump excess pressure out of the tank. When overflow port 146 is closed, for example, by spring-biased sealing of the overfill seal 116, it is necessary for safety purposes to have a pressure activated vent system.
Venting, according to certain embodiments, is accomplished by providing an overpressure vent valve 104. Vent valves suitable for use according to the present invention are conventionally available. Vent valve 104 is only indicated diagrammatically in
Embodiments of a combination valve assembly may preferably comprise a valve housing member 102, an overpressure vent valve 104, a fill valve 106 and an overfill seal element 116. The valve housing member 102 may have a generally right cylindrical shape and include a first end 136, a second end 138 and a longitudinal axis 134 extending therebetween. The valve housing member 102 may have a vent valve socket 120, a fill valve socket 122, and an overflow channel 124. As illustrated in
The fill valve 106 may be disposed within the fill valve socket 122 and have a fill valve pin 132 actuatable between an open position (see, for example,
In certain embodiments, the resilient bias of the overfill seal element 116 is provided by a seal bias spring 118. In preferred embodiments in which a dip tube 108 is at least partially inserted within the overfill channel 124 and extending outwardly from the second end 138, the seal bias spring 118 may be axially secured within the overfill channel 124 at least in part by being disposed between the upper end of the dip tube 108 and the overfill seal element 116.
In particular preferred embodiments, such as the ones depicted in
Embodiments may be adapted to accommodate propane fittings such as, for example, a CGA600 limited standard cylinder valve outlet connection. In such an embodiment the diameter of probe o-ring 110 may be generally adapted to create a seal between the o-ring and the nipple of an outlet connection, when such a connection is threadedly connected to the valve assembly.
Certain preferred embodiments in accordance with the present invention may enable the overfill channel 124, during a fill operation, to be opened and automatically seal simultaneously with the respective opening and closure of the inlet/outlet valve 106. By way of non-limiting example, a fill adaptor (such as the one depicted diagrammatically at 156 in
While embodiments of the invention have been illustrated and described, it is not intended that these embodiments illustrate and describe all possible forms of the invention. Rather, the words used in the specification are words of description rather than limitation, and it is understood that various changes may be made without departing from the spirit and scope of the invention.
This application claims the benefit of U.S. Provisional Application No. 61/818,853 filed May 2, 2013, the contents of which are incorporated by this reference in their entirety for all purposes as if fully set forth herein.
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Number | Date | Country | |
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20140326328 A1 | Nov 2014 | US |
Number | Date | Country | |
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61818853 | May 2013 | US |