Patent ID: 11905780
Assignee: AWA OILFIELD SERVICES, INC.
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 15:
16. A secondary seal for a polished rod stuffing box, wherein the stuffing box has a primary seal pack disposed within the stuffing box and below a stuffing box cap, the secondary seal comprising:
a body having an inner surface and an outer surface separated by a first wall thickness, and an inner side surface and an outer side surface separated by a second wall thickness, wherein the second thickness is less than the first thickness;
a cylindrical opening in the body through the first wall thickness, the opening defined by an inner surface of a cylinder having an upper end extending above the body outer surface and a lower end extending below the body inner surface, the inner cylinder surface comprising a polished rod sealing surface;
a separation in the body from the cylindrical opening to the outer side surface and extending through the first and second wall thicknesses, the separation forming a fluid seal when the separation is closed;
a retainer contacting the seal body to retain the seal on the stuffing box cap;
at least one reinforcement disposed in the body such that movement of the seal is restricted when the polished rode reciprocates through the cylindrical opening; and
wherein when the inner surface of the body contacts an outer top surface of the stuffing box cap, and the inner side surface of the body contacts an outer side surface of the stuffing box cap, the separation is closed and the stuffing box is sealed against fluid intrusion from above the stuffing box cap.