FIELD: oil producing industry; applicable in pumping out of fluid from oil wells. SUBSTANCE: sucker-rod pump consists of cylinder connected with tubing string and plunger with valves connected with sucker-rod string. Cylinder has plug and radial holes. Located on plunger in upper valve cage is spring with pusher for pressing valve to its seat with slots. Connected to plunger lower part whose external surface is conical is lower valve cargo with valve and seat fixed by sub with internal through channel closed by membrane secured by a nut. There is cross-piece which restricts motion of membrane after its operation and radial hole for equalization of pressures. Screwed onto cylinder upper part is coupling with which filter is connected. Filter is installed in interval of location of radial channels. Secured to cylinder lower end is a container with plug for collection of particles and foreign objects entering it through sub channels. Rod for breakage of membrane is provided on sub transverse strip. EFFECT: increased overhaul period, reduced maintenance expenditures and duration of remedial work. 4 dwg
