POSITIVE DISPALCEMENT PUMP Russian patent published in 2006 - IPC F04B53/14 F04B13/00 

FIELD: hydraulic machine building.

SUBSTANCE: in proposed positive displacement pump suction valve-piston seal is provided with cylindrical antifriction bushing with inner end face bead interference-fitted through cylindrical surfaces between surfaces of working cylinder and elastomer sealing member with arrangement of inner end face bead between end face surfaces of outer end face bead of rigid frame and elastomer sealing member. Pressure valve-rod seal has cylindrical antifriction bushing provided with outer end face bead interference-fitted through cylindrical surfaces between surfaces of rod and elastomer sealing member, with arrangement of outer end face bead between end face surfaces on inner end face bead of rigid frame and elastomer sealing member. Side wall of piston ring groove arranged from side of ring groove of housing is made removable.

EFFECT: increased service life, improved reliability, enlarged sphere of application be parameters, provision of convenience of assembling of pump.

3 cl, 1 dwg