Profile: Qingdao Hongbo Petroleum Machinery Co., Ltd. develops mud pump fluid end expendable product. Our research and development includes hy-chrome mud pump, chrome plated and hardened steel liner, 4 cross arms valve & seat, extension rod and piston rod clamp. We offer a wide range of valves & seats such as premium cross arms, arms valve & full-open and long-life bonded valve with urethane. We also supply other expendable fluid end parts such as threaded ring, liner clamp, rod clamp, valve pot cover, liner cage, wear plate and valve guide.