Back pressure regulator with floating seal support

摘要

A sealing apparatus for a back pressure regulator includes: a body defining a process surface, and including: at least one process void communicating with the process surface; a recess disposed in the process surface; a floating support hub disposed in the recess, carrying an O-ring; a vent void communicating with the recess; an inlet port disposed in fluid communication with the at least one process void and adapted to be coupled in fluid communication with a fluid at a process pressure; and an outlet port disposed in fluid communication with the vent void; and a diaphragm having opposed reference and process sides, the diaphragm disposed against the body such that the process side is substantially coplanar with the process surface.

主权项

1. A sealing apparatus for a back pressure regulator comprising:
a body defining a process surface, and including a vent void communicating with the process surface; a generally cylindrical floating support hub including an annular side wall extending between spaced-apart upper and lower ends, and a central bore extending between the upper and lower ends, wherein the side wall has a shape that receives and supports an O-ring, wherein a height of the hub measured between the upper and lower ends is less than a cross-sectional diameter of the O-ring; and wherein the support hub and O-ring are disposed between the diaphragm and the process surface, in fluid communication with the vent void, and wherein a gap is present between the hub and the process surface.