PLUG HEAD ASSEMBLIES

摘要

In accordance with various embodiments, a plug head assembly is provided comprising a ceramic plug head having a frustroconical geometry, wherein the ceramic plug head has a proximal terminus and a distal terminus, wherein the ceramic plug head has a first coefficient of thermal expansion (CTE), a sleeve having a frustroconical geometry conforming to the ceramic plug head and a second CTE, wherein the second CTE is greater than the first CTE, a distal retainer having a frustroconical geometry conforming to the sleeve, the distal retainer having a first engagement portion for engaging the a proximal retainer, the proximal retainer having a second engagement portion for engaging the distal retainer, and a base that couples with the proximal retainer. In addition, thick banded plug heads are provided

主权项

1. A valve seat assembly comprising:
a SiC valve seat having a circumference; a thick band disposed about the circumference of the SiC valve seat, wherein the thick band exerts a radial stress upon the SiC valve seat at a room temperature and at an operating temperature, wherein the radial stress is from between 800 psi and 8000 psi at the operating temperature, wherein the operating temperature is between 120° F. to 1000° F., wherein a probability of survival of the SiC valve seat under axial thermal expansion stress is greater than 95%.