Patent ID: 6435208
Filing Date: 2002-08-20
Classification: F16K,Y10T

Abstract:
A flame-retardant pressure equalizing valve comprising:a housing having an inlet, an outlet opening into the environment in a direction along a longitudinal axis, and passage extending between the inlet and the outlet along the longitudinal axis, a valve body moveably disposed in the housing, said valve body being moveable in an opening direction relative to said housing between a closing position and a blow-off position along an axis that is substantially parallel to said longitudinal axis, and at least one stop on said housing and at least one stop movable with said valve body; wherein the housing and the valve body form a first closure of the passage and, in series therewith, a second closure of the passage with a chamber therein between, wherein a surface projected in the opening direction and enclosed by a circumferential edge of the second closure is larger than a surface projected in the opening direction and enclosed by a circumferential edge of the first closure, wherein the first and second closures are designed so that if the valve body is in a transitional position located between the closing position and the blow-off position, the first closure is open and the second closure is at least partly closed, wherein the second closure is spaced from the first closure in the opening direction, wherein the at least one stop on said housing engages the at least one stop movable with the valve body when the valve body is in the blow-off position; and wherein the valve body includes an end that projects through and past said outlet and into the environment.