div class=trans-pagebuttonPage 1button div class=trans-image a href=https:reader043fdocumentsusreader043viewer20220218025b64518c7f8b9af5448d21f9html5page1jpg target=_blank amp-img class=trans-thumb alt=Page 1: · Drill stem valves are critical rig items and form part of the routine BOP equipment test cycle Additionally to minimise rig downtime it is recommended that Top Drive src=https:reader043fdocumentsusreader043viewer20220218025b64518c7f8b9af5448d21f9html5thumbnails1jpg width=142 height=106 layout=responsive amp-imga divdiv