A constant flow valve comprises a valve body (5) having an inlet passage (2), an outlet passage (3), and a hollow chamber (4) disposed between the passages and inclined with respect to the inlet passage at a certain angle; an opening (7) for connecting the outlet passage with the hollow chamber, an inner...http://www.google.com/patents/US5174332?utm_source=gb-gplus-sharePatent US5174332 - Constant flow valve
