Detachable and lubricable packing gland for electric large-caliber butterfly valve

A detachable and lubricable packing gland for an electric large caliber butterfly valve, comprising a packing gland body (1), wherein the packing gland body (1) comprises a gland body (2) and a pressure ring (3), the pressure ring (3) is arranged at the bottom of the gland body (2), a mounting groove (4) is opened on the bottom of the gland body (2), the diameter of the mounting groove (4) is larger than the outer diameter of the pressure ring (3), the top of the pressure ring (3) is arranged to extend into the mounting groove (4), and a first sealing ring (5) is arranged in a gap between the mounting groove (4) and an outer wall of the top of the pressure ring (3);

• a first through hole (7) for a valve stem (6) to pass through is provided on the gland body (2), and the first through hole (7) is connected to communicate with the mounting groove (4);
• a second through hole (8) for the valve stem (6) to pass through is provided on the pressure ring (3), and a lubrication groove (9) is provided on a hole wall of the second through hole (8);
• the lubrication groove (9) is provided at a middle position of the hole wall of the second through hole (8);
• an oiling hole (10) is provided on an outer wall of one side of the pressure ring (3), a chip removal hole (11) is provided on an outer wall of the other side, and both the oiling hole (10) and the chip removal hole (11) are connected to communicate with the lubrication groove (9).