PISTON PUMP VALVE Russian patent published in 2002 - IPC

FIELD: oil production equipment, piston pumps, particularly sucker-rod and drilling pumps. SUBSTANCE: valve of piston pump includes seat arranged in housing and disk engaging with seat and having rod passing through guide provided in partition with peripheral openings for liquid. Rod is provided at least with one additional disk engaging with partition without closing peripheral openings and arranged outside zone of seat with possibility of synchronous engagement of respective discs with seat and partition. EFFECT: enhanced operational reliability, increased useful life period of pump valve. 1 dwg _