【Daily Question】Advanced Processing 20160907 Fill-in-the-blank: Check valves are installed in ( ) or ( ) directions, specifically~

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To increase popularity and foster technical exchanges among Haiyou users, 【One Question per Day】 is launched. Participation earns 4 points of wealth! 10 wealth points as a reward for correct answers or in-depth discussions! :Lol fill-in-the-blank: Check valves are installed in ( ) or ( ) directions, and specifically include ( ) type, ( ) type, etc. Check valves can be installed in either horizontal or vertical orientation, and there are various types such as those that rely on gravity or swing-type valves. ========================================== ☛\"Petrochemical Special Zone\"’s announcement regarding the selection and rewards for outstanding moderators, technicians, and top members from January to July 2016: http://bbs.hcbbs.com/thread-1608031-1-1.html (Source: Haichuan Chemical Forum) ☛ The second round of selection for outstanding management members at Haichuan – taking place in August and September; the grand prize is a Xiaomi tablet: http://bbs.hcbbs.com/thread-1609580-1-1.html (Source: Haichuan Chemical Forum)