Stuffing Box
Introduction
DPSB double packed stuffing boxes for sucker rod pump installations are part of the well heads of a pumping well. They are designed to seal off the annular space between the polished rod and the tubing.
Technical features
| Max. operating pressure | 3000 psi |
| Connection sizes |
2 3/8”,2 7/8”,3 1/2”,4”,4 1/2”- EUE (NUE) |
| Polished rod sizes | 1”,1 1/8”,1 1/4”,1 5/16”,1 3/8”,1 7/16”,1 1/2”,1 3/4” |
| Outside diameter of the sealing packing | 2 1/4” |
| Height of sealing packing | 2 1/2” |
| Max. operating temperature | 121°C(250°F) -CHEVRON NBR packing 163°C(325°F) -CHEVRON HNBR packing 204°C(400°F) -CHEVRON FKM packing 282°C(540°F) -KEVLAR/PTFE packing |
Description and operation
-The stuffing box is composed of an interior body (item 1), in which a lower sealing packing is fixed (item 4), and an exterior body (item 6) that is screwed onto the interior body; the exterior body holds the upper packing
-The lower packing seals off, after tightening the exterior body; to keep the packing in this position, the exterior body is secured by fastening the lock nut (item 3)
-The upper packing seals off after tightening the box nut (item 7)
-To seal off the annular space between polished rod and tubing completely during any change of upper packing, the lower packing has to be tightened