... 2008 Combined valves,conical valve.plate valve. Low pressure accumulator,high pressure damper. Hot water, Assembly type: horizontal or ... QT800)Nitrogen hardening treatment is applied to attain strong strength, high hardness, durable and corrosion resistant feature.Plunger (material used ... and reliable sealing, long life in easy-wear parts, high volumetric efficiency,etc. On the base of existing series ...