欧美一级视频免费看_色喜亚洲美女沟沟炮交国模_2020日本九道在线视频_亚洲人成www在线观看_亚洲另类色欧美日韩_裸身裸乳免费视频网站_伊人大杳蕉情侣成综合_麻豆国产AⅤ超爽剧情系列_天天拍之夜夜爽综合网_999久久久国产精品消防器材

  The anti-theft shut-off valve is a valve product that has been successfully designed to solve the problems of delayed payment by users in heating systems and losses caused by frequent island oil incidents in oil fields. This anti-theft shut-off valve has good anti-theft performance (three insurances), easy opening and closing, stable sealing effect, and long service life.
  Instructions for using anti-theft shut-off valve: After installing the anti-theft shut-off valve, use the small hexagonal screw on the upper end of the accessory wrench to unscrew the small internal hexagonal screw on the valve cover, remove the cover, and the middle is the lock cylinder. If you have a key lock cylinder, use the key to open it. If you have a password lock cylinder (see password coding and use for anti-theft valves), take out the lock cylinder, and use the lower end of the accessory wrench to open (or close) the butterfly plate of the valve. Close it clockwise and counterclockwise.