Kodi Valavu ya SDV ndi chiyani: Mtetezi wa Chitetezo cha Mafakitale

Buku Lofunika Kwambiri la Ma Valves a SDV: Kuteteza Njira Zofunikira Zamakampani

Mu dziko lofunika kwambiri la mafuta ndi gasi, mankhwala a petrochemical, kupanga magetsi, ndi mafakitale ena opangira zinthu, chitetezo si chinthu chofunikira kwambiri; ndi chofunikira kwambiri. Pamtima pa kuteteza antchito, katundu, ndi chilengedwe ku zoopsa monga moto, kuphulika, kapena kutulutsidwa kwa poizoni pali chida chofunikira kwambiri:Valavu Yotseka (SDV), nthawi zambiri amatchedwansoValavu Yozimitsa Mwadzidzidzi (ESDV)Koma kodi valavu ya SDV ndi chiyani kwenikweni, ndipo n’chifukwa chiyani ili yofunika kwambiri?

An Valavu ya SDV (Valavu Yotseka)ndi valavu yodziyimira yokha yopangidwa mwapadera komanso yovomerezeka yomwe imaphatikizidwa muDongosolo Lotetezedwa ndi Zida Zachitetezo (SIS)Cholinga chake chachikulu ndikupatula mwachangu komanso modalirika gawo la mapaipi kapena zida zikalandira chizindikiro kuchokera ku SIS, chomwe chimayambitsidwa ndi kuzindikira vuto loopsa (monga kuthamanga kwambiri, kutentha kwambiri, kutayikira kwa mpweya, moto, kulephera kwa zida). Kupatula mwachangu kumeneku kumaletsa kukwera kwa vutoli mwa kuletsa kuyenda kwa madzi oopsa (zamadzimadzi, mpweya, kapena magawo ambiri).

Tanthauzo la Valavu ya SDV: Kupitirira Chidule

Fomu Yonse ya Valavu ya SDV

Fomu yonse yaSDndiValavu YotsekaDzinali limafotokoza mwachidule ntchito yake yaikulu: kutseka kayendedwe ka madzi panthawi yadzidzidzi.ESDV (Vavu Yotseka Mwadzidzidzi)kapenaSSV (Valavu Yotseka Chitetezo)nthawi zambiri amagwiritsidwa ntchito mofanana, kugogomezera kufunika kwa "zadzidzidzi" kapena "chitetezo" cha ntchito yake.

Tanthauzo ndi Cholinga Chachikulu

Tanthauzo la valavu ya SDV limaposa zigawo zake zamakina. Limayimira:

* Mzere Womaliza wa Chitetezo:Pamene zowongolera zoyambira zalephera, SDV imagwira ntchito.

* Kuchepetsa Chiwopsezo:Zimathandiza kuchepetsa mwachindunji zotsatira za chochitika choopsa.

* Lamulo Lodalirika:Kulephera si njira ina. Ma SDV ayenera kugwira ntchito nthawi iliyonse akafuna.

* Kuchitapo Kanthu Kokha:Kulowererapo kwa anthu kumachitika pang'onopang'ono kwambiri; ma SDV amachita zinthu mkati mwa masekondi kapena ngakhale ma millisecond.

* Kuphatikiza kwa Machitidwe:Si chipangizo chodziyimira pachokha koma ndi chinthu chofunikira mkati mwa SIS yovomerezeka (IEC 61511 / ISA 84.01).

Kodi Valavu ya SDV Imagwira Ntchito Bwanji? Chiyanjano cha Chitetezo cha Zida (SIS)

SDV sigwira ntchito yokha. Ndi chinthu chomaliza mkati mwaNtchito Yogwiritsa Ntchito Zida Zachitetezo (SIF), gawo la gawo lalikuluSISNayi ndondomeko yanthawi zonse:

1. Kuzindikira Ngozi:Masensa (monga, zotumizira kuthamanga kwa mpweya, zowunikira kutentha, zowunikira mpweya, zowunikira moto) amawunika momwe zinthu zilili.

2. Kukonza Malingaliro:Woyang'anira wodzipereka wa Safety Instrumented System (SIS) (monga Safety PLC) nthawi zonse amawunika zolowetsa za sensa motsatira malire otetezeka omwe adakhazikitsidwa kale.

3. Chizindikiro cha Ulendo:Ngati vuto loopsa latsimikizika, chowongolera cha SIS chimatumiza chizindikiro cha ulendo ku actuator ya SDV valve.

4. Ntchito ya Valavu:Choyezera cha SDV chimasuntha mwachangu valavu kupita pamalo ake okhazikika (nthawi zambiri chimatsekedwa - FC, koma nthawi zina chimatsekedwa - FO kapena chimatsekedwa - FL). Izi zimachotsa madzi owopsa.

5. Kupatula Njira:Njira yoyendera madzi imadulidwa, zomwe zimaletsa ngoziyo kuti isakule kapena kufalikira.

Mphamvu: Ma Actuator a SDV Valve

Choyatsira magetsi ndi chomwe chimasintha chizindikiro chamagetsi kapena cha pneumatic cha SIS kukhala mphamvu yamakina yofunikira kuti chisunthe pulagi/mpira/diski ya valavu mwachangu komanso modalirika. Ma actuator a SDV ali ndi zofunikira zapadera:

* Liwilo lalikulu:Muyenera kusuntha valavu pamalo ake osalephera mkati mwa nthawi yokhazikika (nthawi zambiri masekondi 2-10 pa mavalavu akuluakulu).

* Kudalirika Kwambiri & Kupezeka Kwake:Yapangidwira ntchito zosachitika kawirikawiri koma zofunika kwambiri. Kuchuluka kwa zinthu zomwe zimagwiritsidwa ntchito nthawi zambiri kumakhala kofala.

* Ntchito Yotetezeka:Ayenera kusamukira pamalo otetezeka *osafunikira* mphamvu yakunja (monga, ngati mpweya, magetsi, kapena chizindikiro chatayika). Izi ndizofunikira kwambiri.

* Mphamvu Yokwanira Yokoka/Kukankha:Ayenera kuthana ndi mphamvu zogwirira ntchito (kupanikizika, kuyenda) ndi kukangana kuti valavu ikhale bwino, ngakhale pakakhala zovuta kwambiri.

Mitundu Yodziwika ya Actuator ya SDV

1. Zoyambitsa Mpweya Zobwerera ndi Kubwerera kwa Spring:Mtundu wofala kwambiri wa ma SDV.

* Ntchito:Mpweya wopanikizika umasunga valavu *kutsutsa* kasupe wamphamvu pamalo ake abwinobwino ogwirira ntchito. Pa chizindikiro cha ulendo (kutayika kwa mpweya kapena lamulo la SIS), mpweya umatuluka mwachangu, ndipo kasupeyo amayendetsa valavu mwamphamvu pamalo ake otetezeka (nthawi zambiri amatsekedwa).

* Ubwino:Ukadaulo wotsimikizika, wotetezeka kulephera, wothamanga, komanso wamphamvu kwambiri.

* Zoyipa:Imafuna mpweya wokwanira komanso mpweya woyera komanso wouma.

2. Ma Actuator a Hydraulic Obwerera ndi Kubwerera kwa Spring:

* Ntchito:Mfundo yofanana ndi ya pneumatic, koma imagwiritsa ntchito madzi a hydraulic pansi pa kupanikizika kuti igwire valavu yotseguka/yotsekedwa motsutsana ndi masipu. Kutayika kwa mphamvu ya hydraulic kapena chizindikiro cha trip kumatulutsa madzi, zomwe zimapangitsa masipulogalamu kusuntha valavuyo kuti isawonongeke.

* Ubwino:Mphamvu zambiri kuposa mphamvu ya mpweya ya ma valve akuluakulu kwambiri, yoyenera malo akutali opanda mpweya.

* Zoyipa:Zovuta kwambiri, zomwe zingathe kupangitsa kuti madzi a hydraulic atuluke, zimafuna mphamvu ya hydraulic.

3. Machitidwe Osonkhanitsa Ma Hydraulic:Kawirikawiri imagwiritsidwa ntchito ndi ma valve akuluakulu omwe amafuna mphamvu zambiri.

* Ntchito:Madzi amadzimadzi othamanga kwambiri omwe amasungidwa mu ma accumulator amatulutsidwa kuti apatse mphamvu actuator mwachangu ngati pakufunika. Masipiringi kapena mphamvu yokoka zingathandize. Dongosololi limasungidwa ndi mapampu.

* Ubwino:Mphamvu ndi liwiro lalikulu kwambiri pa ntchito zofunika kwambiri za ma large-bore.

* Zoyipa:Zofunika kwambiri pa ntchito yovuta, mtengo, ndi kukonza.

MOV vs. SDV Valve: Kumvetsetsa Kusiyana Kofunika Kwambiri

Mfundo yodziwika bwino yosokoneza ndiMa Vavu Oyendetsedwa ndi Magalimoto (MOVs)molimbana ndiMa SDVNgakhale kuti ma valve onsewa akhoza kukhala odziyimira pawokha, ntchito zawo ndi zofunikira zawo ndizosiyana kwambiri:

* Mfundo Zofunika Kuziganizira:Ma MOV ndi a *kulamulira*. Ma SDV ndi a *chitetezo*. MOV nthawi zambiri si yoyenera ngati SDV pokhapokha ngati yapangidwa mwapadera, yotsimikizika, komanso yolumikizidwa ngati gawo la SIS (zomwe sizichitika kawirikawiri chifukwa cha liwiro komanso zoletsa zomwe zimachitika chifukwa cha injini zamagetsi). Kugwiritsa ntchito MOV yosatsimikizika pa ntchito zachitetezo ndi chiopsezo chachikulu.

Ma Valves a SDV ndi BDV: Ogwirizana nawo pa Chitetezo

Valavu ina yomwe nthawi zambiri imatchulidwa pamodzi ndi ma SDV ndiValavu Yopopera (BDV)Ngakhale kuti zonsezi ndi ma valve otetezera mkati mwa SIS, zimakwaniritsa zolinga zosiyana, nthawi zina zogwirizana:

* SDV (Valavu Yotseka):Imayang'ana kwambiri pa kusungunula kwa madzi. "Siyani kuti madzi alowe." Ntchito yake ndi kutseka gawo.

* BDV (Blowdown Valve):Imayang'ana kwambiri pa kuchepetsa kupanikizika ndi kutulutsa mpweya. "Chotsani mosamala zinthu zomwe zilipo kale." Ntchito yake ndikutulutsa mwachangu madzi opanikizika (mpweya kapena madzi) kuchokera ku zida kapena mapaipi *pambuyo* kapena nthawi zina *panthawi* yodzipatula kupita kumalo otetezeka (flare, vent stack, closed system).

Momwe Amagwirira Ntchito Pamodzi:

1. Ngozi yapezeka (monga moto pa compressor ya gasi).

2. Ma SDV amatsekakumtunda ndi kumunsi kwa mtsinje, kupatula gawo la compressor.

3. Ma BDV atsegulidwa, kutulutsa mpweya wothamanga kwambiri womwe uli mkati mwa gawo lolekanitsidwa kupita ku dongosolo loyaka moto, kuchepetsa kuthamanga kwa mpweya ndi moto.

4. Kuchita izi pamodzi kumachotsa ngozi *ndi* kuchepetsa mphamvu zomwe zimaipatsa.

Miyeso ya Valavu ya SDV: Miyezo ndi Zinthu Zosankha

Ma valve a SDV amabwera m'mitundu yosiyanasiyana, malinga ndi payipi kapena nozzle ya zida zomwe ayenera kuyikamo. Miyeso yake imayendetsedwa ndi muyezo, makamaka motsogozedwa ndi:

* ASME B16.10:Miyeso ya Maso ndi Maso ya Ma Valves a Ferrous (Chipata cha Covers, globe, cheke, ndi zina zotero).

* ASME B16.5:Ma Flange a Mapaipi ndi Zolumikizira Zozungulira (Zimalamulira kukula kwa flange ndi ziwerengero - Gulu 150, 300, 600, 900, 1500, 2500).

* API 6D / API 6DSS:Mafotokozedwe a Mapaipi ndi Ma Vavu a Mapaipi (Ball, Cheke, Chipata, Pulagi) / Subsea. Muyezo waukulu wa ma SDV mu mapaipi amafuta ndi gasi, womwe umaphatikizapo kapangidwe, zipangizo, mayeso, ndi miyeso.

* Zofunikira za Wopanga:Ngakhale kutsatira miyezo, mapangidwe enaake a ma valve (makamaka ndi ma actuator) adzakhala ndi ma catalog apadera.

Zinthu Zofunika Kuziganizira Pankhani ya Ma SDV:

* Kukula kwa Chitoliro Chodziwika (NPS):Kukula kwa chitoliro chomwe valavu imalumikiza (monga, 2″, 4″, 12″, 24″, 36″+).

* Kalasi Yopanikizika (ASME Rating):Kupanikizika kwakukulu komwe valavu imapangidwira (monga, Gulu 150, 300, 600, 900, 1500, 2500).

* Kuyang'anizana ndi Maso (F2F) Kukula:Kutalika pakati pa malo olowera ndi malo otulutsira mpweya kumayang'ana. Chofunika kwambiri pa kapangidwe ka mapaipi ndi malo oimikapo mapaipi.

* Kubowola Flange:Kapangidwe ka dzenje, kukula, ndi nambala yake malinga ndi ASME B16.5 ya NPS ndi Kalasi yeniyeni.

* Miyeso ya Actuator:Choyatsira magetsi (makamaka masika omangira ma valve akuluakulu) chingawonjezere kwambiri kuchuluka kwa magetsi (kutalika, m'lifupi, kutalika). Malo oti choyatsira magetsi chiyende komanso malo osungira magetsi ndi ofunikira kwambiri.

* Malumikizano Omaliza:Flanged (RF, RTJ), Butt Weld (BW), Socket Weld (SW), Threaded. Flanged ndi yofala kwambiri pa ma SDV kuti ikhale yosavuta kuyiyika ndi kukonza.

* Kulemera:Ma SDV akuluakulu okhala ndi ma actuator amatha kulemera matani angapo. Zofunikira pakuthandizira kapangidwe ka nyumba ndi kusamalira ndizofunikira kwambiri.

Mkati mwa Safety Sentinel: Mbali Zofunika za SDV Valve

Kumvetsetsa zigawo zazikulu kumathandiza kumvetsetsa kapangidwe ndi kukonza kwa SDV:

1. Thupi la Valavu:Chipinda chachikulu chokhala ndi kupanikizika, chokhala ndi zinthu zamkati. Zipangizo (chitsulo cha kaboni, chitsulo chosapanga dzimbiri, aloyi) zimasankhidwa kuti zigwirizane ndi kupanikizika, kutentha, ndi madzi. Malekezero opindika kapena olumikizidwa.

2. Boneti:Chophimbacho chimamangiriridwa ku thupi, zomwe zimathandiza kuti zinthu zamkati zilowemo ndikutseka thupi. Nthawi zambiri zimaphatikizapo kutseka/kutseka tsinde.

3. Dulani:Zigawo zamkati zomwe zimakhudzidwa ndi madzi a ndondomekoyi zomwe zimalamulira kuyenda kwa madzi:

* Mpando:Kutseka pamwamba pa zolumikizira za membala wotsekedwa.

* Membala Wotseka:Gawo lomwe limasuntha kuti lilepheretse kuyenda kwa madzi (Mpira, Chipata, Disiki, Pulagi).

* Tsinde:Shaft yolumikiza actuator ndi chiwalo chotseka, kutumiza mphamvu ndi kuyenda. Malo ofunikira otsekera.

4. Woyambitsa:Monga tafotokozera kale (Pneumatic/Hydraulic spring-return kapena accumulator system). Imayikidwa mwachindunji ku valavu/yoko.

5. Choyimira (Chosankha - poyesa sitiroko pang'ono):Ngakhale kuti ma SDV nthawi zambiri amakhala otseguka/otsekedwa kwathunthu, machitidwe ena amagwiritsa ntchito malo oyesera pang'ono (PST) kuti atsimikizire kuyenda popanda kuyenda konse.

6. Ma Valves a Solenoid (Ofunika Kwambiri):Ma valve olamulidwa ndi magetsi mu mzere woperekera mpweya/hydraulic kupita ku actuator. Chizindikiro cha ulendo wa SIS nthawi zambiri chimachotsa mphamvu ma solenoid awa, zomwe zimapangitsa kuti mpweya/madzimadzi a actuator atuluke mwachangu ndikulola masika kubwerera.

7. Ma Swichi Oletsa:Perekani mayankho amagetsi ku SIS/makina owongolera kutsimikizira malo a valavu (Yotseguka/Yotsekedwa/Yogubuduzika).

8. Chizindikiro cha Malo Akomweko:Choyezera chowoneka bwino (nthawi zambiri pa actuator) chosonyeza malo a valavu.

9. Goli:Kapangidwe kolumikiza actuator ndi thupi la valavu ndikuthandizira tsinde.

10.Kulongedza/Zisindikizo:Chofunika kwambiri popewa kutuluka kwa madzi m'thupi ndi m'malo olumikizirana mafupa. Zipangizo ziyenera kuthana ndi mavuto a ntchito.

Kulankhula Chilankhulo: Chizindikiro cha Valavu ya SDV

Pa zojambula za uinjiniya, makamakaMapaipi ndi Zithunzi za Zipangizo (P&IDs), zizindikiro zimawonetsa mwachangu mtundu wa valavu ndi ntchito yake. Chizindikiro cha SDV chimaphatikiza zinthu:

1. Chizindikiro cha Valavu Yoyambira:Zimayimira mtundu wa valve:

* Valavu ya Mpira:Makona atatu awiri akuloza mkati, olumikizidwa ndi mzere.

* Valavu ya Chipata:Kapangidwe ka mphero pakati pa mizere iwiri yoyima.

* Valavu ya pulagi:Chooneka ngati diamondi pakati pa mizere iwiri yoyima.

2. Chizindikiro cha Actuator:Kwa ma SDV, izi ndizofunikira:

* Asikweya(choyimira actuator ya pneumatic/hydraulic) chajambulidwa cholumikizidwa ku chizindikiro cha valavu.

* Mkati kapena pafupi ndi bwalo,kansalu kakang'onokuloza *ku* valavu kumasonyezakubwerera kwa masika.

* Njira yomwe kansalu kamene kakulozera (ku chizindikiro cha valavu) kakuyimirazochita zotetezeka:

* Katatu koloza pa valavu =Kulephera Kutsekedwa (FC)

* Katatu koloza kutali ndi valavu =Kulephera Kutsegula (FO)(Sizofala kwambiri kwa ma SDV)

3. Udindo wa SIS:Kawirikawiri amalembedwa kuti “SDV”, “ESDV”, “SSV”, kapena kulembedwa ndi nambala yeniyeni ya SIF (monga XV-101).

4. Chizindikiro cha Solenoid:Nthawi zina bwalo laling'ono lokhala ndi chilembo "S" (cha solenoid) limawonjezedwa pafupi ndi chizindikiro cha actuator.

Chitsanzo cha Chizindikiro (Valavu ya Mpira wa SDV Yotsekedwa Yosagwira Ntchito):

|——| <– Choyezera (Chikwere)
| > | <– Katatu Kobwerera kwa Masika (kolozera mkati = Kulephera Kutsekedwa)
|——|

|

/—–\

—-| O |—- <– Chizindikiro cha Valavu ya Mpira (Mizere/Ma Triangles)
\—–/

(Dziwani: Zizindikiro zenizeni za P&ID zimasiyana pang'ono malinga ndi miyezo ya kampani, koma chowunikira cha spring-return ndiye chizindikiritso chachikulu cha SDV/ESDV).

Kusankha Chida Chabwino: Mitundu ya Ma Valavu a SDV

Mtundu woyenera wa valavu yogwiritsira ntchito SDV umadalira zinthu zingapo: kufunikira kotseka bwino, liwiro, kutsika kwa kuthamanga kwa magazi, mawonekedwe a madzi, kukula, ndi mtengo. Mitundu yodziwika kwambiri ndi iyi:

1. Ma SDV a Ma Valuvu a Mpira:

* Ntchito:Kutembenuka kotala (kuzungulira madigiri 90). Mpira wokhala ndi bore umazungulira kuti utsegule/tseke.

* Ubwino: Mwachangu kwambirintchito (yabwino kwambiri pa liwiro la SDV), kutseka bwino kwambiri ngati thovu (kofunikira pakupatula), kufunikira kwa mphamvu yochepa (yabwino pa kukula kwa actuator), kutsika kochepa kwa mphamvu ikatsegulidwa, chibowo chonse chikupezeka, kutseka mbali zonse ziwiri. Mtundu wa SDV wodziwika kwambiri.

* Zoyipa:Sikoyenera kugwedezeka kwambiri (kuwonongeka kwa cavitation), kuthekera kowonongeka kwa mpando ndi slurry kapena zolimba.

* Zabwino Kwambiri:Ntchito zambiri zoyeretsa mpweya, madzi, ndi mpweya zomwe zimafuna kutsekedwa mwachangu komanso molimba. Pali mitundu yosiyanasiyana ya kukula/kupanikizika.

2. Ma SDV a Gate Valve:

* Ntchito:Kuyenda kolunjika kwa mizere yambiri. Chimbale chozungulira kapena chozungulira chimatsetsereka molunjika ku njira yoyenda kuti chitseguke/chitseke.

* Ubwino:Kuyenda molunjika, kutsika kwa mphamvu pang'ono kwambiri ikatsegulidwa bwino, yabwino kwa matope/madzimadzi odetsedwa pang'ono (chiopsezo chochepa cha kuwonongeka kwa mpando poyerekeza ndi ma valve a mpira), kutseka mbali zonse ziwiri n'kotheka.

* Zoyipa:Kugwira ntchito pang'onopang'ono kuposa ma valve a mpira (kutembenuka kawiri poyerekeza ndi kutembenuka kotala), kuthekera kwa kukokoloka kwa mpando/chipata pakuthamanga kwambiri ikatsegulidwa pang'ono, yomwe ingathe kutuluka madzi pakapita nthawi poyerekeza ndi ma valve a mpira, imafuna mphamvu yowonjezera ya actuator.

* Zabwino Kwambiri:Mizere ikuluikulu ya mabowo komwe kutsika kwa mphamvu kumakhala kofunikira kwambiri, ntchito zothira madzi, kugwiritsa ntchito komwe liwiro silili lofunika kwambiri kuposa mbali zina za dongosolo. Sizofala kwambiri pa ma SDV amakono kuposa ma valve a mpira.

3. Ma SDV a Ma Valve Olumikizira:

* Ntchito:Kuzungulira kotala (kuzungulira madigiri 90). Pulagi yocheperako kapena yozungulira yokhala ndi cholumikizira imazungulira mkati mwa thupi.

* Ubwino:Kapangidwe kosavuta, kofulumira, kotetezeka kutseka bwino ngati thovu, kumatha kuthana ndi matope bwino, ndipo pali doko lonse.

* Zoyipa:Mphamvu yogwira ntchito ndi yayikulu kuposa ma valve a mpira (makamaka akuluakulu/ogwira ntchito molimbika), kuthekera kokhala ndi galling (kukhudzana ndi chitsulo ndi chitsulo), zofunikira pakudzola (kwa mitundu yodzola).

* Zabwino Kwambiri:Zofunikira pa liwiro lapakati, ntchito zothira madzi, mizere yaying'ono, kugwiritsa ntchito kwina komwe kapangidwe ka pulagi ndi kopindulitsa. Sizofala kwambiri ngati ma valve a mpira.

Chidule cha Zofunika Kuganizira Zosankha

* Liwiro: Mpira > Pulagi > Chipata

* Kutseka Umphumphu: Mpira ≈ Pulagi > Chipata

* Kutsika kwa Kupanikizika (Kutsegulidwa): Chipata ≈ Mpira (Doko Lonse) ≈ Pulagi (Doko Lonse) << Mpira/Pulagi (Doko Lochepetsedwa)

* Kugwira Ntchito Mopanda Mantha/Molimba: Chipata > Pulagi > Mpira

* Mphamvu/Torque ya Actuator: Chipata (Chopondereza Kwambiri) > Pulagi > Mpira (Nthawi zambiri Mphamvu Yotsika Kwambiri)

* Mtengo (Nthawi zambiri): Mpira ≈ Chipata > Pulagi (Yodalira kukula/kukula kwambiri)

Kutsiliza: Udindo Wosakambirana wa Valavu ya SDV

Valavu Yotseka (SDV kapena ESDV) ndi yoposa valavu ina chabe yomwe ili munjira. Ndi gawo lachitetezo lopangidwa mwaluso kwambiri, loyesedwa bwino, komanso lovomerezeka kwambiri, lomwe limagwira ntchito ngati chitetezo chachikulu chamakina mkati mwa Chitetezo Chogwiritsa Ntchito Zida. Kutha kwake kusiyanitsa mwachangu komanso modalirika madzi owopsa akamafunidwa ndikofunikira kwambiri popewa ngozi m'mafakitale omwe ali pachiwopsezo chachikulu.

Kumvetsetsa tanthauzo lake (Shutdown Valve), ntchito yake yotetezeka yoyendetsedwa ndi ma actuator apadera (spring-return pneumatic/hydraulic), kusiyana kwake komveka bwino ndi ma valve owongolera monga ma MOV, ubale wake ndi ma BDV, miyeso yake yokhazikika ndi zigawo zake, chizindikiro chake chapadera cha P&ID, ndi mitundu yosiyanasiyana ya ma valve (makamaka mpira, chipata, pulagi) zomwe zimagwiritsidwa ntchito popanga ndikofunikira kwa mainjiniya, ogwiritsa ntchito, ndi akatswiri achitetezo.

Kusankha, kukhazikitsa, kuyesa, ndi kusunga ma SDV motsatira miyezo yapadziko lonse lapansi (monga IEC 61511, API 6D, API 6A) si njira yabwino yokha; ndi chinthu chofunikira kwambiri pakugwira ntchito bwino komanso kuteteza anthu, zomera, ndi dziko lapansi. Valavu ya SDV imakhala ngati mlonda chete, wosamala, wokonzeka kuchitapo kanthu pamene chitetezo chikufunikira kwambiri.