Pakati pa ogwiritsa ntchito omwe amagwiritsa ntchito ma valve akuluakulu a globe tsiku lililonse, nthawi zambiri amanena kuti ma valve akuluakulu a globe nthawi zambiri amakhala ovuta kutseka akagwiritsidwa ntchito m'malo olumikizirana ndi kusiyana kwakukulu kwa kuthamanga, monga nthunzi, madzi amphamvu, ndi zina zotero. Mukatseka ndi mphamvu, nthawi zonse zimapezeka kuti padzakhala kutuluka kwa madzi, ndipo zimakhala zovuta kutseka mwamphamvu. Chifukwa cha vutoli chimayambitsidwa ndi kapangidwe ka valavu ndi mphamvu yotulutsa yokwanira ya mulingo wa malire a anthu.

Kusanthula kwa Kuvuta kwa Kusintha Ma Valves Aakulu

Mphamvu ya munthu wamkulu yochokera pamlingo wopingasa ndi 60-90kg, kutengera ndi thupi losiyana.

Kawirikawiri, njira yoyendera ya valavu yozungulira imapangidwa kuti ikhale yotsika mkati ndi kunja. Munthu akatseka valavu, thupi la munthu limakankhira gudumu lamanja kuti lizungulire mopingasa, kotero kuti chivundikiro cha valavu chisunthire pansi kuti chitseke. Panthawiyi, ndikofunikira kuthana ndi kuphatikiza kwa mphamvu zitatu, zomwe ndi:

(1) Mphamvu yokankhira ya Axial Fa;

(2) Mphamvu yokangana Fb pakati pa kulongedza ndi tsinde la valavu;

(3) Mphamvu yolumikizirana pakati pa tsinde la valavu ndi pakati pa diski ya valavu

Chiwerengero cha mphindi ndi ∑M=(Fa+Fb+Fc)R

Zikuoneka kuti kukula kwa mainchesi, mphamvu yoyendetsera ya axial imakhala yayikulu. Ikakhala pafupi ndi momwe imatsekedwera, mphamvu yoyendetsera ya axial imakhala pafupi ndi kupanikizika kwenikweni kwa netiweki ya mapaipi (chifukwa cha P1-P2≈P1, P2=0)

Mwachitsanzo, valavu ya DN200 caliber globe imagwiritsidwa ntchito pa chitoliro cha nthunzi cha 10bar, ndipo mphamvu yoyamba yotseka ya axial thrust Fa=10×πr2=3140kg yokha, ndipo mphamvu yozungulira yopingasa yofunikira potseka imakhala pafupi ndi mphamvu yozungulira yopingasa yomwe matupi a anthu wamba amatha kutulutsa. mphamvu, kotero zimakhala zovuta kuti munthu m'modzi atseke valavu yonse pansi pa vutoli.

Zachidziwikire, mafakitale ena amalimbikitsa kuyika ma valve otere mozungulira, zomwe zimathetsa vuto loti zimakhala zovuta kutseka, komanso pali vuto loti zimakhala zovuta kutsegula mutatseka.

Kusanthula Zomwe Zimayambitsa Kutuluka kwa Ma Valves Aakulu a Globe

Ma valve akuluakulu a globe nthawi zambiri amagwiritsidwa ntchito m'malo operekera ma boiler, masilinda akuluakulu, main mains a nthunzi ndi malo ena. Malo awa ali ndi mavuto awa:
(1) Kawirikawiri, kusiyana kwa kuthamanga kwa mpweya pamalo otulutsira boiler ndi kwakukulu, kotero kuchuluka kwa mpweya wotuluka m'madzi ndi kwakukulu, ndipo kuwonongeka kwa nthaka pamalo otsekereza nakonso n'kokulirapo. Kuphatikiza apo, mphamvu ya kuyaka ya boiler singakhale 100%, zomwe zimapangitsa kuti nthunzi pamalo otulutsira boiler ikhale ndi madzi ambiri, zomwe zingayambitse kuwonongeka kwa mpweya wotuluka m'madzi ndi kutuluka m'madzi pamalo otsekereza valavu mosavuta.

(2) Pa valavu yoyimitsa pafupi ndi potulukira boiler ndi sub-cylinder, chifukwa nthunzi yomwe yangotuluka mu boiler imakhala ndi kutentha kwambiri nthawi ndi nthawi, pamene madzi ake akusefukira, ngati kufewetsa madzi a boiler sikuli bwino, gawo lina la madzi nthawi zambiri limatuluka. Zinthu za asidi ndi alkali zimayambitsa dzimbiri ndi kukokoloka kwa pamwamba potseka; zinthu zina zomwe zimasungunuka zimatha kumamatira pamwamba potseka valavu ndi kupanga makristalo, zomwe zimapangitsa kuti valavu isathe kutseka bwino.

(3) Pa ma valve olowera ndi otulutsira a ma sub-cylinders, kugwiritsa ntchito nthunzi pambuyo pa valavu kumakhala kwakukulu ndipo nthawi zina kochepa chifukwa cha zofunikira pakupanga ndi zifukwa zina. Zimayambitsa kukokoloka, kutsekeka kwa ma valve ndi kuwonongeka kwina kwa pamwamba pa valavu.

(4) Kawirikawiri, payipi ikatsegulidwa ndi mainchesi akuluakulu, payipiyo imafunika kutenthedwa, ndipo nthawi zambiri kutentha kumafunika nthunzi pang'ono kuti idutse, kuti payipiyo itenthedwe pang'onopang'ono komanso mofanana mpaka pamlingo winawake valavu yoyimitsa isanatsegulidwe mokwanira kuti payipiyo isawonongeke. Kutentha mwachangu kumayambitsa kukulirakulira kwakukulu, komwe kumawononga ziwalo zina zolumikizira. Komabe, munjira imeneyi, kutsegula valavu nthawi zambiri kumakhala kochepa kwambiri, zomwe zimapangitsa kuti kuchuluka kwa kukokoloka kukhale kwakukulu kuposa momwe kumagwiritsidwira ntchito nthawi zonse, ndipo kumachepetsa kwambiri moyo wa ntchito pamwamba pa valavu yotseka.

Mayankho a Mavuto Okhudza Kusintha Ma Valves Aakulu a Globe

(1) Choyamba, tikukulangizani kusankha valavu yozungulira yotsekedwa ndi bellows, yomwe imapewa mphamvu ya kukana kukangana kwa valavu ya plunger ndi valavu yopakira, ndikupangitsa kuti switch ikhale yosavuta.

(2) Pakati pa valavu ndi mpando wa valavu ziyenera kupangidwa ndi zinthu zomwe sizingagwere bwino komanso sizingawonongeke, monga Stellite carbide;

(3) Ndikofunikira kugwiritsa ntchito kapangidwe ka diski ya ma valve awiri, yomwe sidzayambitsa kukokoloka kwakukulu chifukwa cha kutsegula pang'ono, komwe kudzakhudza moyo wa ntchito ndi mphamvu yotsekera.