Pakati pa ogwiritsa ntchito omwe amagwiritsa ntchito ma valve akuluakulu a globe tsiku ndi tsiku, nthawi zambiri amafotokoza vuto loti ma valve a globe omwe ali ndi mainchesi akuluakulu nthawi zambiri amakhala ovuta kutseka pamene amagwiritsidwa ntchito pa TV ndi kusiyana kwakukulu kwapakati, monga nthunzi, kuthamanga kwambiri. madzi, etc. Potseka ndi mphamvu, nthawi zonse amapezeka kuti padzakhala kutayikira, ndipo n'zovuta kutseka mwamphamvu. Chifukwa cha vutoli chimayamba chifukwa cha mapangidwe a valve ndi torque yosakwanira yotulutsa malire a anthu.

Kusanthula Kwazovuta Pakusintha Mavavu Aakulu Awiri

Avereji yopingasa malire a munthu wamkulu ndi 60-90kg, kutengera matupi osiyanasiyana.

Nthawi zambiri, mayendedwe oyenda a valve yapadziko lonse lapansi amapangidwa kuti azikhala otsika komanso okwera. Munthu akatseka valavu, thupi la munthu limakankhira gudumu lamanja kuti lizungulire mozungulira, kotero kuti valavu imayenda pansi kuti izindikire kutseka. Panthawiyi, ndikofunikira kuthana ndi kuphatikiza kwa mphamvu zitatu, zomwe ndi:

(1) Axial kukankha mphamvu Fa;

(2) Mkangano wamphamvu Fb pakati pa kulongedza ndi tsinde la valve;

(3) Mphamvu yolumikizirana Fc pakati pa tsinde la valavu ndi pachimake cha valavu

Nthawi zonse ndi ∑M=(Fa+Fb+Fc)R

Zitha kuwoneka kuti kukula kwake, ndikokulirapo kwa mphamvu ya axial thrust. Ili pafupi ndi malo otsekedwa, mphamvu ya axial thrust ili pafupi ndi kupanikizika kwenikweni kwa netiweki ya chitoliro (chifukwa cha P1-P2≈P1, P2=0)

Mwachitsanzo, valavu ya DN200 yapadziko lonse lapansi imagwiritsidwa ntchito pa chitoliro cha nthunzi cha 10bar, kukankhira koyamba kotseka kwa axial Fa = 10 × πr2 = 3140kg, ndipo mphamvu yozungulira yopingasa yofunikira kuti itseke ili pafupi ndi mphamvu yozungulira yopingasa yomwe matupi aumunthu amatha. zotuluka. kukakamiza malire, kotero ndizovuta kwambiri kuti munthu mmodzi atseke mokwanira valavu pansi pa chikhalidwe ichi.

Zoonadi, mafakitale ena amalimbikitsa kukhazikitsa ma valve oterowo mmbuyo, omwe amathetsa vuto lovuta kutseka, koma palinso vuto lomwe limakhala lovuta kutsegula mutatseka.

Kusanthula Zomwe Zimayambitsa Kutayikira Kwamkati kwa Mavavu Aakulu Aakulu Akuluakulu a Globe

Ma valve akulu akulu am'mimba mwake nthawi zambiri amagwiritsidwa ntchito popangira boiler, masilinda akuluakulu, ma mains a nthunzi ndi malo ena. Malo awa ali ndi mavuto awa:
(1) Nthawi zambiri, kusiyana kwapanikiza pamalo opangira boiler kumakhala kwakukulu, motero kuchuluka kwa nthunzi kumakhalanso kokulirapo, komanso kuwonongeka kwa kukokoloka kwa malo osindikizira nakonso kumakhala kokulirapo. Kuonjezera apo, kuyaka kwa moto wamoto sikungakhale 100%, zomwe zidzachititsa kuti nthunzi yomwe imatuluka mu boiler ikhale ndi madzi ambiri, zomwe zingayambitse cavitation ndi cavitation kuwonongeka kwa valve yosindikiza pamwamba.

(2) Kwa valavu yoyimitsa pafupi ndi potulukira kwa boiler ndi silinda yaying'ono, chifukwa nthunzi yomwe yangotuluka kumene mu boiler ili ndi chodabwitsa chapakatikati, pakukhutitsidwa kwake, ngati kufewetsa kwamadzi otentha. si abwino kwambiri, mbali ina ya madzi nthawi zambiri imakhala yamvula. Acid ndi zinthu za alkali zidzachititsa dzimbiri ndi kukokoloka kwa malo osindikizira; zinthu zina zonyezimira zimatha kumamatiranso pamwamba pa valavu ndikuwala, zomwe zimapangitsa kuti valavu isatseke mwamphamvu.

(3) Kwa ma valve olowera ndi otuluka a ma silinda ang'onoang'ono, kutentha kwa nthunzi pambuyo pa valavu kumakhala kwakukulu ndipo nthawi zina kumakhala kochepa chifukwa cha zofunikira zopanga ndi zifukwa zina. Zimayambitsa kukokoloka, cavitation ndi kuwonongeka kwina kwa ma valve osindikiza pamwamba.

(4) Nthawi zambiri, payipi ya m’mimba mwake ikatsegulidwa, payipiyo imayenera kutenthedwa kale, ndipo kutenthetserako kumafuna kuti nthunzi idutse pang’ono, kotero kuti payipiyo imatha kutenthedwa pang’onopang’ono komanso mofanana. valavu yoyimitsa isanatsegulidwe mokwanira kupewa kuwononga mapaipi. Kutentha kofulumira kumayambitsa kufalikira kwakukulu, komwe kumawononga mbali zina zolumikizirana. Komabe, pochita izi, kutsegula kwa valve nthawi zambiri kumakhala kochepa kwambiri, zomwe zimapangitsa kuti chiwombankhanga chikhale chachikulu kwambiri kuposa momwe amagwiritsira ntchito nthawi zonse, ndipo amachepetsa kwambiri moyo wautumiki wa valve yosindikiza pamwamba.

Njira Zothetsera Mavuto Pakusintha Mavavu Aakulu Aakulu Amitundu Yapadziko Lonse

(1) Choyamba, tikulimbikitsidwa kusankha valavu ya globe yotsekedwa ndi bellows, yomwe imapewa kukhudzidwa kwa kusagwirizana kwa valavu ya plunger ndi valavu yonyamula, ndikupangitsa kusintha kukhala kosavuta.

(2) Pachimake valavu ndi mpando valavu ayenera kupangidwa ndi zipangizo ndi bwino kukokoloka kukana ndi kuvala ntchito, monga Stellite carbide;

(3) Ndibwino kuti mutenge kachipangizo kaŵirikaŵiri ka valavu, chomwe sichidzayambitsa kukokoloka kwakukulu chifukwa cha kutsegula pang'ono, zomwe zidzakhudza moyo wautumiki ndi kusindikiza.