Frank Lockwood idakhazikitsidwa mu 1977 ndipo likulu lake lili ku Houston, USA.Frank Lockwood ali ndi chidziwitso chochuluka cha ma valve ndi chidziwitso cha mafakitale kuti apatse makasitomala mipopi yabwino, ma valve, zopangira, flanges ndi kayendetsedwe ka polojekiti, kuphatikizapo mapangidwe, makina, QA, ndi zina zotero.
Zogulitsa za Frank Lockwood zikuphatikiza ma valve oyendetsa magetsi olephera, ma modulating amagetsi, ma valve oyendetsa magetsi otsekedwa ndi zina zotero.

Flotech idakhazikitsidwa mu 1961 ndipo likulu lake lili ku United States.Flotech yakhala ikukulitsa zogulitsa ndi ntchito zake kwazaka zambiri popeza mabungwe ena.Flotech yadzipereka kupatsa makasitomala mitundu yatsopano ya ma valve ndi ma drive, komanso ntchito zosamalira.
Zogulitsa zimasiyanasiyana valavu yamagetsi yamagetsi, valavu yagulugufe yamagetsi, valavu ya mpira wa pneumatic ndi ma valve ena odziwikiratu.

DYNAQUIP Controls idakhazikitsidwa mu 1935. Kwa zaka zoposa 70, akhala akudzipereka kuti apereke mankhwala abwino kwambiri ndi makasitomala amafuta ndi gasi, mafakitale a chakudya ndi zakumwa, ndi zina zotero.Ntchito yosinthika kuti ikwaniritse zosowa zamakasitomala amakampani, nyumba zogona komanso zamalonda.Zogulitsa zimaphatikizapo valavu ya mpira, valavu ya butterfly, automatic actuator ndi zina zotero.

Cr-tec Engineering ndi ogulitsa magetsi, pneumatic and manual valves.Mankhwala angagwiritsidwe ntchito zosiyanasiyana mankhwala madzimadzi.Ntchito zamafuta ndi gasi, Kuchiza kwa zimbudzi, chithandizo chamadzi akumwa, zopangira magetsi, makina opangira makina, kupanga zombo, ndi zina zambiri.
Zogulitsa zimaphatikizapo mavavu amagetsi a 2-way mpira, ma valve amagetsi a 3-way mpira, ndi ma valve ena odzichitira okha.

Schneider ndi kampani yodziwika bwino yomwe ili ndi mbiri yopitilira zaka 180 yodzipereka kuti ipereke mayankho osamalira zachilengedwe komanso okhazikika padziko lonse lapansi.Schneider ali ndi ma valve ochuluka a mpira wamagetsi kuti akwaniritse zosowa za mafakitale anu osiyanasiyana.