polish rod stuffing box

 It avoid well pollution, improve production efficiency and increase oil output. 

Thread connection

When tight, the thread of upper cap and packing box rotate same angle to prevent eccentric wear so as to prolong service life. 

contrary thread

①Thread of it is contrary to the connection tread of pressure cap and stuffing box, change packing directly without venting.

②mark direction logo.

slot

The surface of contact packing inwall and stuffing box with many slots. When tight, packing after compression into slot. As the polished rod is after fine grinding, squeezed in slot packing will be automatically reset. Prevent untight seal and prolong polish rod service life.

packing

packing after specially processed can be used for 2-4years, reduce cost.

disc spring

At the moment of polish rod broken, disc spring in the gland prevent oil jet that will cause environmental pollution.