... rod pumps and special pumps such as viscous oil pumps, sand anti-wedgingpumps and anti-gas- ... excellent. We manufacture and supply the deep oil well sucker rod pumps to API 11AX specification ... manufacture special pumps, such as hi-viscosity crude oil pumps, gas-proof pumps and sand-proof pumps ... well pumps, hydraulic feed back pumps for heavy crude oil, pumps with forced mechanic valves, gas-proof pumps ...