Vavu yowunika idapangidwa ndikupangidwa kwathunthu molingana ndi zofunikira za API 6A 《Zofotokozera za Zida za Wellhead ndi Mtengo wa Khrisimasi》, zomwe zimatha kugwiritsidwa ntchito mosinthana ndi zida zofananira kunyumba ndi kunja zomwe zimagwirizana ndi API 6A Standard. Pachimake amatengera sulfide-kukana chitsulo ndipo amatha kugwiritsidwa ntchito mu chikhalidwe H2S, valavu thupi lopangidwa ndi aloyi zitsulo forging ndi ntchito bwino. Mitundu iwiri ya ma valve Check amaperekedwa ndi landrill: Swing type ndi Lift type.