The HiTemp HydraNut utilizes a patented seal design which can be energized after the operation at elevated temperatures. The seals are machined individually and are not integral parts of the HiTemp nut body or piston. Material selection is temperature specific. The seal assembly procedure guarantees that peripheral seal contact is maintained through pressure application.
The HydraNut load is retained through a patented lockring thread form that ensures maximum load retention, and minimizes the lockring wall thickness, to facilitate a compact and therefore more efficient nut design. The featured top lockring design offers ease of operation and flexibility of design for confined space applications.
The application parameters determine the specific design characteristics of the HydraNut. This includes designing the HydraNut to locate within the confined spot face diameters of the many designs of gas turbine.
Variable High Temperatures
The HydraNut is unique for use at elevated temperatures; the material of the nut and the seals are temperature specific. Additionally, the application of a coating prevents high-temperature surface scaling of the HydraNut internal components.
The HydraNut comprises four main components plus the hydraulic quick connector. The main components comprise the nut body, threaded internally to suit the fastener and externally to suit the lockring, the that moves to generate the bolt extension, the lockring, that is threaded internally and screws onto the nut body, and which is situated under the piston and sits on the nut spot face or flange surface. The quick connector enables fast and reliable interconnection of numerous HydraNuts to the hydraulic pump for simultaneous operation.
How it works
The HydraNut incorporates its own internal annular hydraulic jack. When high-pressure oil is injected into the nut, the piston and body are forced apart developing a purely tensile load in the bolt and stretching it. The bolt extension is locked in place by turning the lockring which maintains the load during plant operation. To remove the HydraNut, the tightening process is simply reversed.