Disclosed herein is a check valve assembly for use in high pressure pumps having a high pressure plunger reciprocating in a pressure chamber or for use in other pressure chambers wherein both fluid inlet check valve means and fluid outlet check valve means are provided adjacent to the pressure chamber....http://www.google.fr/patents/US4862911?utm_source=gb-gplus-shareBrevet US4862911 - Check valve assembly for high pressure pumps
