Gas pressure regulator having high and low pressure shutoff means
AssigneeTextron Inc.
InventorTheodore A. St. Clair
Life of this patent
Estimating the term…
Abstract
There is disclosed herein a gas pressure regulator having valve means for stopping the flow of gas downstream through the regulator when the pressure of the incoming gas is higher or lower than predetermined acceptable values even though acceptable pressure is subsequently restored, and manually operated means for resetting the valve means after it is determined that the pressure of the gas flowing to the inlet of the regulator has returned to said predetermined acceptable values, provision being made for maintaining a high pressure shutoff valve closed even though pressure of gas in the regulator returns to acceptable pressure by manually operable means not accessible to inexperienced persons.
Claims5
A gas pressure regulator comprisng a valve housing having an inlet means, outlet means and a wall separating said inlet means and said outlet means;
- a diaphragm casing;
- means for removably securing said diaphragm casing to said valve housing, said diaphragm casing having a gas chamber communicating with said outlet means and an air chamber leading to the atmosphere;
- a diaphragm mounted in said diaphragm casing;
- a bushing mounted in said wall of said valve housing;
- an orifice sleeve slidably mounted in said bushing and extending between and communicating with said inlet means and said outlet means, said orifice sleeve having a terminal upstream valve seat and an orifice having a downstream valve seat;
- resilient means in said bushing yieldingly retaining said orifice sleeve in normal position;
- a main valve;
- means operated by said diaphragm for moving said main valve toward and from said downstream valve seat of the orifice to regulate the flow of gas to said gas chamber and outlet means;
- means including a valve body slidably mounted in said bushing and having a high pressure shutoff valve positioned to be engaged by said terminal upstream valve seat on said orifice sleeve to shut off the flow of gas to and through said orifice sleeve to said gas chamber and outlet means when the pressure of the gas in the gas chamber rises above a predetermined acceptable pressure, said high pressure shutoff valve being caused by the pressure of the gas in said inlet means to remain in engagement with said terminal upstream valve seat and keep the flow of gas shut off when said orifice sleeve returns to normal position upon the pressure of the gas in the regulator becoming acceptable;
- and means in the orifice sleeve positioned to engage said shutoff valve including means extending through the downstream orifice of said orifice sleeve and accessible for manual engagement and operation when said diaphragm casing is removed from said valve housing for separating said high pressure shutoff valve from said upstream valve seat on said orifice sleeve to restore the flow of gas therethrough.
Dependencies are inferred from the claim text.