Shengji fine tuning long-term polished rod stuffing box is our company’s new type patent product. The product is easy to install and convenient to maintain due to simple structure. It is a polished rod stuffing box, which does not require changing the sealing parts frequently through several micro adjustments, to guarantee the sealing effect.

The chosen sealing part is a cone sealing element which is made of special formula. Shengji the fine tuning long-term polished rod stuffing box is made of three level seals：sealing part Ι designed to help change sealing part ΙΙ in case of failure due to abrasion. When operating normally, Shengji polished rod stuffing box bolts on both sides are always in the highest position while sealing part Ι is in a free state. It takes effect while changing sealing part ΙΙ.

Sealing part II is effective in sealing the entire polished rod’s movement,it can be adjusted by fine tuning structure, and compensates the element abrasion continuously to keep a good seal. Sealing part ΙΙΙ prevents the grease spill from the stuffing box，it prevents sand from dropping into the seal and causing damage to the polished rod and the sealing parts, it doesn’t bear the pressure.