High temperature shaft seal for bleed valve with roller bearings

A bleed valve comprising:

• a valve housing with a main flow passage and a bore;
• a shaft with a first end and a second end, wherein the shaft extends across the main flow passage and is rotatable about an axis;
• a flow control member mounted to the shaft, wherein the flow control member is configured to regulate a flow of a fluid through the main flow passage;
• a bearing housing with a bearing compartment, the bearing housing connected to the valve housing, wherein the first end of the shaft extends through the bore of the valve housing into the bearing compartment;
• a bearing assembly disposed in the bearing compartment;
• and
• a seal assembly disposed between the valve housing and the shaft, the seal assembly comprising:
• a first seal piece circumferentially surrounding the shaft and disposed between the shaft and the valve housing, wherein an axial length of the first seal piece relative to the shaft is greater than an axial length of the bore of the valve housing closest to the shaft;
• and
• a second seal piece in contact with and disposed axially adjacent to the first seal piece relative to the shaft, wherein the second seal piece axially biases the first seal piece relative to the shaft against the valve housing.