API 6A Wellhead manual na hydraulic Choke Valves
Valve yo gufunga ni igice cy'ingenzi cy'igiti cya Noheli kandi yagenewe kugenzura umusaruro w'amazi y'ikigega cy'amavuta, ibikoresho by'umubiri n'ibice bya valve yo gufunga bihuye neza na API 6A na NACE MR-0175 Standard Specifications, kandi ikoreshwa cyane mu gucukura peteroli mu nyanja no mu nyanja. Valve yo gufunga ikoreshwa cyane cyane mu guhindura imiterere n'umuvuduko wa sisitemu ya manifold; Hari ubwoko bubiri bwa valve zo kugenzura ubwiyongere bw'amazi: zihamye n'izishobora guhindurwa. Valve zo gufunga zishobora guhindurwa zigabanyijemo ubwoko bw'inshinge, ubwoko bw'ingofero y'ingofero, ubwoko bw'ingofero y'ingofero n'ubwoko bw'ikigega cy'ingofero hakurikijwe imiterere; Dukurikije uburyo bwo gukora, ishobora kugabanywamo ibice bibiri by'intoki n'iby'amazi. Iherezo ry'ingofero ya Valve yo gufunga ni umugozi cyangwa Flange, ihujwe na non cyangwa flange. Valve yo gufunga igwamo: valve yo gufunga, valve yo gufunga, valve yo gufunga, valve yo gufunga na valve yo gufunga, n'ibindi.