I-NSEN ilungiselele iiseti ezimbini zeevalvu, kuquka iivalvu ze-150LB kunye ne-600LB, kwaye zombini ziphumelele uvavanyo lomlilo.

Ke ngoko, isiqinisekiso se-API607 esifunyenweyo ngoku sinokugubungela ngokupheleleyo umgca wemveliso, ukusuka kuxinzelelo lwe-150LB ukuya kwi-900LB kunye nobukhulu obuyi-4″ ukuya kwi-8″ nangaphezulu.

Kukho iintlobo ezimbini zesatifikethi sokhuseleko lomlilo: i-API6FA kunye ne-API607. Esokuqala sisetyenziselwa iivalvu ezisemgangathweni ze-API 6A, kwaye esesibini sisetyenziselwa ngokukodwa iivalvu zokusebenza ezingama-90-degree ezifana neevalvu zebhabhathane kunye neevalvu zebhola.

Ngokomgangatho we-API607, ivalvu evavanyiweyo kufuneka itshise kwilangatye elingama-750℃ ~ 1000℃ imizuzu engama-30, ize emva koko yenze uvavanyo lwe-1.5MPA kunye ne-0.2MPA xa ivalvu ipholile.

Emva kokugqiba uvavanyo olungasentla, kufuneka olunye uvavanyo lokusebenza.

Ivalvu ingaphumelela uvavanyo kuphela xa ukuvuza okulinganisiweyo kungaphakathi komda oqhelekileyo kuzo zonke iimvavanyo ezingentla.