1. Onjezani mafuta otsekera

Pa ma valve omwe sagwiritsa ntchito mafuta otsekera, ganizirani kuwonjezera mafuta otsekera kuti muwongolere magwiridwe antchito a tsinde la ma valve.

2. Onjezani chodzaza

Pofuna kukonza magwiridwe antchito otsekera ku tsinde la valavu, njira yowonjezera kulongedza ingagwiritsidwe ntchito. Nthawi zambiri, zodzaza ziwiri kapena zingapo zimagwiritsidwa ntchito. Kungowonjezera kuchuluka, monga kuwonjezera chiwerengero kuchokera pa zidutswa zitatu kufika pa zisanu, sikudzakhala ndi zotsatira zomveka.

3. Bwezerani chodzaza cha graphite

Kupaka kwa PTFE komwe kumagwiritsidwa ntchito kwambiri kumakhala ndi kutentha kwa -20 mpaka +200°C. Kutentha kukasintha kwambiri pakati pa malire apamwamba ndi otsika, magwiridwe antchito ake otsekera adzachepa kwambiri, adzakalamba mwachangu ndipo moyo wake udzakhala waufupi.

Zodzaza graphite zosinthika zimathetsa zofooka izi ndipo zimakhala ndi moyo wautali. Chifukwa chake, mafakitale ena asintha ma PTFE onse kukhala ma graphite packing, ndipo ngakhale ma valve owongolera omwe agulidwa kumene agwiritsidwa ntchito atasintha ma PTFE packing ndi ma graphite packing. Komabe, hysteresis yogwiritsa ntchito graphite filler ndi yayikulu, ndipo nthawi zina kukwawa kumachitika poyamba, kotero izi ziyenera kuganiziridwa.

4. Sinthani njira yoyendera madzi ndikuyika P2 kumapeto kwa tsinde la valavu.

Pamene △P ndi yayikulu ndipo P1 ndi yayikulu, kutseka P1 kumakhala kovuta kwambiri kuposa kutseka P2. Chifukwa chake, njira yoyendetsera madzi imatha kusinthidwa kuchokera ku P1 kumapeto kwa tsinde la valavu kupita ku P2 kumapeto kwa tsinde la valavu, zomwe zimathandiza kwambiri mavavu okhala ndi kuthamanga kwambiri komanso kusiyana kwakukulu kwa kuthamanga. Mwachitsanzo, mavavu ozungulira nthawi zambiri ayenera kuganizira zotseka P2.

5. Gwiritsani ntchito kutseka gasket ya lenzi

Potseka chivundikiro chapamwamba ndi chapansi, kutseka mpando wa valavu ndi matupi a valavu apamwamba ndi apansi. Ngati ndi chisindikizo chathyathyathya, kutentha kwambiri komanso kuthamanga kwambiri, ntchito yotseka imakhala yoipa, zomwe zimapangitsa kuti pakhale kutuluka kwa madzi. M'malo mwake mungagwiritse ntchito chisindikizo cha gasket cha lens, chomwe chingapangitse zotsatira zabwino.

6. Bwezerani gasket yotsekera

Mpaka pano, ma gasket ambiri otsekera amagwiritsabe ntchito ma board a asbestos. Pa kutentha kwambiri, ntchito yotsekera ndi yofooka ndipo nthawi yogwira ntchito ndi yochepa, zomwe zimapangitsa kuti madzi atuluke. Pankhaniyi, mungagwiritse ntchito ma gasket ozungulira, mphete za "O", ndi zina zotero, zomwe mafakitale ambiri agwiritsa ntchito tsopano.

7. Mangani mabawuti mofanana ndipo muwatseke ndi ma gaskets owonda

Mu kapangidwe ka valavu yowongolera yokhala ndi chisindikizo cha "O", pamene ma gasket okhuthala okhala ndi kusintha kwakukulu (monga mapepala opindika) agwiritsidwa ntchito, ngati kukanikiza kuli kosagwirizana ndipo mphamvu yake ili yosagwirizana, chisindikizocho chidzawonongeka mosavuta, kupendekeka komanso kusokonekera. Zimakhudza kwambiri magwiridwe antchito otsekera.

Chifukwa chake, pokonza ndi kusonkhanitsa valavu yamtunduwu, mabotolo okakamiza ayenera kumangidwa mofanana (dziwani kuti sangamangidwe nthawi imodzi). Zingakhale bwino ngati gasket yokhuthala ingasinthidwe kukhala gasket yopyapyala, yomwe ingachepetse mosavuta kupendekera ndikutsimikizira kutsekedwa.

8. Wonjezerani m'lifupi mwa pamwamba potseka

Chigawo chapakati cha valve (monga pulagi ya valve ya malo awiri ndi valavu ya sleeve) chilibe malo ozungulira otsogolera ndi otsogolera pampando wa valve. Pamene valavu ikugwira ntchito, chigawo chapakati cha valve chimakhala ndi mphamvu ya mbali ndipo chimatuluka kuchokera mbali yolowera. Chigawo chachikulu, kusiyana kofanana kwa chigawo cha valve chikakhala chachikulu, ndiye kuti chinthu cha mbali imodzi chidzakhala choopsa kwambiri. Kuphatikiza apo, kusintha, kusakhazikika, kapena kusinthasintha pang'ono kwa chigawo cha valve (nthawi zambiri kusinthasintha kwa 30° kuti chitsogozedwe) kudzapangitsa kuti chigawo chapakati cha valve chitsekedwe chikayandikira kutseka. Nkhope ya kumapeto kwa chamfered imayikidwa pamwamba pa chitseko cha valve, zomwe zimapangitsa kuti chigawo chapakati cha valve chidumphe ikatseka, kapena osatseka konse, zomwe zimapangitsa kuti chigawo chapakati cha valve chituluke kwambiri.

Njira yosavuta komanso yothandiza kwambiri ndiyo kuwonjezera kukula kwa malo otsekera pakati pa valve, kuti mainchesi ochepa a mbali ya kumapeto kwa valve akhale ochepera 1 mpaka 5 mm kuposa mainchesi a mpando wa valve, ndipo akhale ndi chitsogozo chokwanira chotsimikizira kuti valavu ikulowetsedwa mu mpando wa valve ndikusunga kukhudzana kwabwino kwa malo otsekera.