Honeywell International Inc.
Force equilibrium of a valve rod due to internal pressure equalization

Abstract:

An apparatus includes a safety shut-off valve for use with a gas regulator. The safety shut-off valve includes a housing, a valve rod, a vent chamber, and a vent line. The housing includes an interior chamber configured to regulated pressure in a fluid. The valve rod is disposed in the housing and controls a valve for interrupting the fluid in the internal chamber. The vent chamber receives ambient air and maintains pressure equalization of the ambient air and the fluid within a maximum pressure of the fluid. The vent line is disposed in a center of the valve rod and provides fluid communication of the ambient air between the vent chamber and an outside of the housing.