A method of forming a one way ball valve
element for a rotary ball valve assembly, the method comprising the steps of: inserting an impedance element through an insertion opening of a ball valve element into a bore; forming a fluid opening in the ball valve element which is non-rectilinearly aligned with the insertion opening and which communicates with the bore; and sealing the insertion opening. A ball valve element for a rotary ball valve assembly formed using such a method; and a rotary ball valve assembly comprising a ball valve element formed using such a method are also provided.
This ball valve element 210 is formed from a standard valve body 212 having a closed-bore 220, instead of a through-bore. As a result, the closed-bore 220 only has a first pre-existing or pre-formed opening 222. An impedance element 218 isdimensioned to fit the closed-bore 220 as a close or interference fit, similarly to the first embodiment. However, a slot along opposite sides of the closed-bore could be provided, similarly to the second embodiment, and two plate-shaped impedanceelements could be inserted to lie in spaced parallel relationship.
Once the or each impedance element 218 is located in the closed-bore 220, second and third fluid opening 224 and 226 are formed in opposite walls 228 of the valve body 212. The second and third fluid openings 224, 226 are spaced andnon-rectilinearly aligned with the first existing opening 222. The second and third fluid openings 224, 226 are rectilinearly aligned with each other, but may be non-rectilinearly aligned if necessity dictates.
The second and third fluid openings 224 and 226 both open out into, and thus fluidly communicate with, the existing closed-bore 220 leading from the first existing opening 222. The first opening 222 is then capped or sealed 234 as describedabove, resulting in a new fluid-flow passage 216 being formed through the valve body 212.
Although FIG. 8 shows the newly formed second and third fluid openings 224 and 226 being defined by a plurality of apertures 230 corresponding with only secondary tortuous conduits 232b of the single impedance element 218, obviously otherarrangements or combinations of arrangements to define the second and third fluid openings 224, 226 are possible depending on the configuration of the or each impedance element 218 utilised.
It is thus possible to provide a simplified method of forming a one way ball valve element for a rotary ball valve assembly. It is also possible to dispense with the requirements of machining and grinding a part defining an opening adjacent to aninserted impedance element.
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