Ball valves have a housing that defines a flow passage and a ball valve member disposed therein. The ball valve member is typically a sphere having a central through passage. The ball rotates between a closed position, wherein the ball valve member central through passage is not aligned with, nor in fluid communication with, the housing flow passage and an open position, wherein the ball valve member central through passage is at least partially aligned with, and at least in partial fluid communication with, the housing flow passage. The ball through passage may have the same or similar cross-sectional area as the housing flow passage, which minimizes changes (pressure, volume, speed) of the liquid passing through the ball valve.
In one aspect, the innovation relates to a ball valve assembly comprising a housing having a chamber with an inlet and an outlet defining a flow passage, a ball having a through passage, a linear actuator and a rotation converter configured to convert the linear movement of the actuator into rotational movement of the ball so as to substantially align or misalign the through passage with the flow passage.
In the drawings:
More specifically, the linear actuator 18 is configured to linearly move between at least a first position and a second position. The rotation converter 16 converts the linear movement of the linear actuator 18 into rotational movement, which rotates the ball 14 relative to the ball seat 19. The rotation of the ball 14 rotates the through passage 21 into and out of alignment with the flow passage 23 in the housing 12.
The linear actuator 18 in the second position corresponds to the through passage 21 being substantially misaligned with the flow passage 23, defining a closed position of the ball 14 where no flow through the flow passage 23 is allowed. The linear actuator 18 in the first position corresponds to the through passage 21 being substantially aligned with the flow passage 23, defining an open position ball 14 where flow through the flow passage 23 is allowed. The linear actuator 18 in a position between the first position and second position may correspond to the through passage 21 being partially aligned or misaligned with the flow passage 23, defining a variable position ball 14 where flow through the flow passage 23 is partially allowed. In this way, controlling the actuation of the linear actuator 18 controls the flow through the flow passage 23.
The degree of alignment/misalignment of the through passage 21 with the flow passage 23 controls the volumetric flow rate through the ball valve assembly 10. As previously described, complete alignment of the through passage 21 and flow passage 23 results in maximum flow through the ball valve assembly 10 is achieved, and complete misalignment of the through passage 21 and the flow passage 23 results in no flow through the ball valve assembly 10. In some implementations it is only necessary to have the valve operation as either a fully opened or fully closed condition. However, it is possible to control the amount/degree of alignment such that the ball valve assembly 10 functions as a variable flow rate valve, which has a flow rate corresponding to the amount of alignment.
The ball valve assembly 100 is similar to the first embodiment illustrated in
The second embodiment of the ball valve assembly 100 has several differences from the first embodiment with respect to the details of the rotation converter 116 and linear actuator 118. The salient differences will be described. The rotation converter 116 comprises a stem 126 in communication with the ball 114 that extends through a stem passage in communication with the chamber 113 defined by an opening in the ball seat 119 that is substantially perpendicular to the flow passage 123. The stem 126 comprises a first screw thread 132 disposed on the stem 126 that is complementary with a second screw thread 134 (best seen in
The linear actuator 118 is disposed in a piston chamber 136 formed in the housing 112 and comprises a piston 138 linearly movable between at least a first position, depicted in
The operation of the ball valve assembly 100 will be described with respect to
When the pressurized fluid supplied by the fluid source 140 ceases to enter the fluid inlet 130, the spring force of the biasing spring 128 is exerted on the piston 138 causing the piston 138 to linearly move from the first position depicted in
Furthermore, by controlling the pressure of the pressurized fluid supplied by the fluid source 140 relative to the spring force of the biasing spring 128, it is possible to linearly move the piston 138 to a plurality of positions between the first and second positions. Each position of the piston 138 corresponds to a degree of alignment between the through passage 121 of the ball 114 and the flow passage 123 of the housing 112. In this way, the area of the opening between the through passage 121 and the flow passage 123 is controlled, thereby effectively controlling the flow rate of the fluid flowing through the flow passage 123.
In another embodiment according to the innovation, the piston chamber 136 may have fluid inlets and outlets disposed on opposite sides of the piston 138 so as to eliminate the need for a biasing spring 128. Fluid pressure selectively supplied and released to the piston chamber 136 on opposite sides of the piston 138 through the fluid inlets and outlets may be used to effect the linear movement of the piston 138 and correspondingly effect the position of the ball 114 through passage 121 relative to the flow passage 123 of the housing 112, thereby effectively controlling the flow rate of the fluid flowing through the flow passage 123.
It will be understood that the rotation converter may comprise any suitable channel and follower, not just the complementary threads as illustrated, wherein the channel is located on one of the actuating element and stem and the follower is located on the other of the actuating element and stem. In one example, but not by way of limitation, the channel comprises at least one pin. It will also be understood that the fluid pressure used to actuate the actuating element may be in the form of, but not limited to, hydraulics or pneumatics and the actuating element may be configured to actuate at a broad range of applied fluid pressures. It will further be understood that the ball valve assembly may be used in any application where flow rate control of any fluid is desired.
The embodiments described above provide for a variety of benefits including that the embodiments allow for compact and light weight ball valve assembly by encompassing the actuating element and ball in a single housing. Further, the ball valve assembly may be actuated in the absence of electricity or human intervention, providing greater flexibility with respect to mounting locations and application environment.
To the extent not already described, the different features and structures of the various embodiments may be used in combination with each other as desired. That one feature may not be illustrated in all of the embodiments is not meant to be construed that it may not be, but is done for brevity of description. Thus, the various features of the different embodiments may be mixed and matched as desired to form new embodiments, whether or not the new embodiments are expressly described. All combinations or permutations of features described herein are covered by this disclosure.
This written description uses examples to disclose the innovation, including the best mode, and also to enable any person skilled in the art to practice the innovation, including making and using any devices or systems and performing any incorporated methods. The patentable scope of the innovation is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.
Filing Document | Filing Date | Country | Kind |
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PCT/US2013/074879 | 12/13/2013 | WO | 00 |