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US 2011/0308967A1 Dec.22,2011 Also,theinnerWallofthehousing121couldincludeaportion of a diffuser for each of the impellers 125. As in the other embodiments, the sacri?cial bodies 131 are formed of a sac ri?cial metal for shedding electrons into the ?uid ?oW. [0078] IntheembodimentofFIG.10,acentrifugalpump 137 isalso schematically shoWn to include a housing 139 and an impeller 140. In this embodiment, sacri?cial bodies 141 aremounted to severalvanes 145 forrotationthereWith. Each of the sacri?cial bodies 141 includes a needle 143 that points in a direction opposite to the direction of rotation of the impeller 140, as shoWn by the arroW. The sacri?cial bodies 141 are formed of a material for shedding electrons as previ ously discussed in connection With the other embodiments. [0079] ThevariousembodimentsinFIGS.1-10disclose sacri?cial bodies that corrode as a result of ?uid ?oWing over them. The corrosion of the sacri?cial bodies releases elec tronsintothe?uid?oW thatinhibitcorrosionofmore expen sive components of the pumps, such as ?uid end blocks and housings.Thesacri?cialbodiesarereadilyreplacedandinex pensive. [0080] Intheforegoingdescriptionofcertainembodi ments, speci?c terminology has been resorted to for the sake of clarity. HoWever, the disclosure is not intended to be lim itedtothe speci?c terms so selected, and itistobe understood that each speci?c term includes other technical equivalents Which operate in a similar manner to accomplish a similar technical purpose. Terms such as “left” and right”, “front” and “rear”, “above” and “beloW” and the like are used as Words of convenience to provide reference points and are not to be construed as limiting terms. ponent, the release of Which is mitigated by said shedding of electronsfromthesacri?cialbody. 4. The method according to claim 1, further comprising attachingatleastoneneedletothesacri?cialbodytofacilitate thesheddingoftheelectronsfromthesacri?cialbody. 5. The method according to claim 4, Wherein in use the needleispointingdoWnstream. 6. The method according to claim 4, Wherein the needle is formed of a metal that is less subject to corrosion than the sacri?cialbody. 7.Themethodaccordingtoclaim1,furthercomprisingthe stepofmountinganupstreamportionofthesacri?cialbody intothepump,thesacri?cialbodyhavingapro?letoenhance turbulence of the ?uid ?oWing over the sacri?cial body. 8.Themethodaccordingtoclaim1,Whereinthepump is positionedsuchthatnoportionofthepump isimmersedinthe ?uid to be pumped by the pump. 9.Themethodaccordingtoclaim1,Whereinthesacri?cial body is formed from one or more materials from the group comprisingZinc,aluminum,magnesiumoralloysthereof. 10. The method according to claim 1, Wherein the compo nent comprises a ?uid end block having a chamber, a plunger bore leading to the chamber, a suction valve port leading to the chamber, and a discharge valve port passing from the chamber. 11. The method according to claim 10, Wherein step (a) comprisesmountingthesacri?cialbodyWithinthechamber. 12. The method according to claim 10, Wherein step (a) [0081] Inthisspeci?cation,theWord“comprising”istobe comprisesmountingthesacri?cialbodystationarilyWithin understoodinits“open”sense,thatis,inthesenseof“includ theplungerboresurroundingtheplunger. ing”, and thus not limited to its “closed” sense, that is the senseof“consistingonlyof”.A correspondingmeaningisto be attributed to the corresponding Words “comprise”, “com prised”and“comprises”Wheretheyappear. [0082] Inaddition,theforegoingdescribesonlysome embodiments of the disclosure, and alterations, modi?ca tions, additions and/or changes can be made thereto Without departingfromthescopeandspiritofthedisclosedembodi ments,theembodimentsbeingillustrativeandnotrestrictive. [0083] Furthermore,thedisclosurehasbeendescribedin connection With What are presently considered to be the most practical and preferred embodiments. It is to be understood thatthedisclosureisnottobelimitedtothedisclosedembodi nentcomprisesahousinghavingarotatableimpellertherein. ments, but on the contrary, is intended to cover various modi ?cations and equivalent arrangements included Within the spirit and scope of the disclosure. Also, the various embodi ments described above may be implemented in conjunction With other embodiments, e.g., aspects of one embodiment may be combined With aspects of another embodiment to realiZe yet other embodiments. Further, each independent featureorcomponentofanygivenassemblymay constitute an additional embodiment. 1.A methodofreducingcavitationdamagetoacomponent Withinapump, comprising: (a) mounting a sacri?cial body Within the pump; and (b)operatingthepump topump ?uidataratethatcausesat least some cavitation to occur on the component, Wherein the pumped ?uid ?oWs over the sacri?cial body to shed electrons into the ?oWing ?uid in the vicinity of 18. The method according to claim 17, Wherein step (a) comprisesmountingthesacri?cialbodyWithinthehousing adjacentaperipheryoftheimpeller. said cavitation. 2.Themethodaccordingtoclaim1,Whereinthesacri?cial thesacri?cialbodybeingformedofamateriallessresistant body comprises a material that is more easily corroded than thecomponent. 3. The method according to claim 1, Wherein in use the operating step causes hydrogen ions to release from the com to corrosion as compared to the ?uid end block. 21.Thepump accordingtoclaim20,furthercomprisingat least one needle mounted to the sacri?cial body, the needle being immersed in use in the ?uid ?oW. 13. The method according to claim 10, Wherein step (a) comprisesmountingthesacri?cialbodytothesuctionvalve formovement thereWith. 14. The method according y claim 10, Wherein step (a) comprises mounting the sacri?cial body Within the suction valve port upstream from a suction valve. 15. The method according to claim 10, Wherein the com ponentcomprisesaplungerintheplungerbore. 16. The method according to claim 15, Wherein step (a) comprisesmountingasacri?cialbodytotheplunger. 17. The method according to claim 1, Wherein the compo 19. The method according to claim 17, Wherein step (a) comprises mounting the sacri?cial body to the impeller for rotationthereWith. 20.A pump, comprising: a ?uid end block having a chamber, a plunger bore leading tothechamber,asuctionvalveportleadingtothecham ber, and a discharge valve port passing from the cham ber; suction and discharge valves mounted for reciprocation Within the suction valve port and discharge valve port, respectively; a sacri?cial body mounted Within the ?uid end block for immersion during use in ?uid ?oW; andPDF Image | PUMP CAVITATION DEVICE
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