One more big difference between DIB and DBB is a chance to reduce tension. Normally having a DBB valve, There are 2 unidirectional self-relieving seats. These seats usually do not rely on an out of doors system to relieve force. On the other hand, a DIB valve makes use of http://valvesandfittings35789.blogpostie.com/11606060/not-known-facts-about-bleeder-valve