Gas cylinder valve assembly
First Claim
1. A valve assembly for controlling the flow of fluid from a source under high pressure, comprising a housing having an inlet for fluid from the source and a main bore having a central axis and extending axially therethrough that opens to the inlet, a main valve stem mounted to the housing and extending within the housing bore, the valve stem having an enlarged diametric end portion that has an annular terminal edge within the housing bore and an axial stem bore opening through the annular terminal edge, an annular valve seat mounted in the stem bore and having an annular terminal edge portion and a generally cylindrical inner peripheral surface, an axial extedgeing main valve body mounted in the body bore, at least one of the housing and the valve body having a fluid outlet, the valve body having a reduced diameter first edge portion extedgeing within the valve seat, a valving surface portion joined to the body reduced diameter portion, a terminal second edge portion axially remote from the body first edge portion and a fluid passage opening through the body first edge portion to the valve seat inner peripheral surface and to the outlet, the valve body having a cylindrical portion in fluid sealing relationship with the housing and having a first shoulder facing the valve seat terminal edge portion and the stem enlarged diametric portion terminal edge to provide an annular chamber that opens to the housing inlet, the valve stem being axially movable between a valve closed position that the valve seat blocks fluid flow from the chamber to the opening of the passage to the valve seat and a valve open position permitting fluid flow from the chamber to the passage, the valve stem having at least one annular shoulder facing axial opposite the seat terminal edge portion and the enlarged diametric portion terminal edge in fluid communication with the inlet and of an area slightly greater than the seat terminal edge portion and the enlarged diametric portion terminal edge whereby the inlet pressure is in fluid communication with the at least one shoulder and the seat terminal edge portion and the enlarged diameter portion edge portion to constantly urges the valve stem to move to its closed position and power operated actuator for selectively moving the valve stem to its valve open position.
1 Assignment
0 Petitions
Accused Products
Abstract
The gas valve assembly includes a housing with a bore and a main valve body and a main valve stem mounted therein. The valve body has a fluid passage fluidly connecting the inlet and one of a housing and valve body outlet with the valve stem mounting a valve seat and being movable for blocking fluid flow through the passage. In two embodiments, the housing is threadable to the neck portion of a vessel for the inlet opening to the vessel interior and the main valve body mounts a manual operated shut off valve extending within the valve body to selectively block fluid flow through the passage and an excess flow valve to block fluid flow through the passage when the flow to the outlet is greater than desired. The last two mentioned valves include a common piston in the fluid passage.
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Citations
18 Claims
- 1. A valve assembly for controlling the flow of fluid from a source under high pressure, comprising a housing having an inlet for fluid from the source and a main bore having a central axis and extending axially therethrough that opens to the inlet, a main valve stem mounted to the housing and extending within the housing bore, the valve stem having an enlarged diametric end portion that has an annular terminal edge within the housing bore and an axial stem bore opening through the annular terminal edge, an annular valve seat mounted in the stem bore and having an annular terminal edge portion and a generally cylindrical inner peripheral surface, an axial extedgeing main valve body mounted in the body bore, at least one of the housing and the valve body having a fluid outlet, the valve body having a reduced diameter first edge portion extedgeing within the valve seat, a valving surface portion joined to the body reduced diameter portion, a terminal second edge portion axially remote from the body first edge portion and a fluid passage opening through the body first edge portion to the valve seat inner peripheral surface and to the outlet, the valve body having a cylindrical portion in fluid sealing relationship with the housing and having a first shoulder facing the valve seat terminal edge portion and the stem enlarged diametric portion terminal edge to provide an annular chamber that opens to the housing inlet, the valve stem being axially movable between a valve closed position that the valve seat blocks fluid flow from the chamber to the opening of the passage to the valve seat and a valve open position permitting fluid flow from the chamber to the passage, the valve stem having at least one annular shoulder facing axial opposite the seat terminal edge portion and the enlarged diametric portion terminal edge in fluid communication with the inlet and of an area slightly greater than the seat terminal edge portion and the enlarged diametric portion terminal edge whereby the inlet pressure is in fluid communication with the at least one shoulder and the seat terminal edge portion and the enlarged diameter portion edge portion to constantly urges the valve stem to move to its closed position and power operated actuator for selectively moving the valve stem to its valve open position.
- 9. A gas valve assembly mountable to the threaded neck of a vessel containing fluid under pressure, comprising a housing having portion threadable to the vessel neck portion, the last mentioned housing portion having an inlet opening to the vessel interior when the housing is mounted to the neck and an outlet, and a fluid passage fluidly connecting the inlet to the outlet, said passage including in the housing, an axially elongated housing bore having a central axis and extending axially though the housing and opening to both the inlet and the outlet, an operable main valve that forms at least part of the passage and extending in the housing bore for selectively blocking fluid flow through the passage and permitting fluid flow through said passage, a manually operated valve extending at least in part in said passage between the main valve and the outlet for selectively blocking fluid flow through the passage and an excess flow valve extending in the passage for automatically blocking fluid flow to the outlet in the event the rate of flow through to the outlet exceeds a preselected value, the excess flow valve being mounted by the main valve, and power operated actuator means for selectively operating the main valve between its position.
- 15. A gas valve assembly mountable to the threaded neck of a vessel containing fluid under pressure, comprising a housing having portion threadable to the vessel neck portion and an axially elongated bore extending axially therethrough, the housing bore having a first end portion and a second end portion, the last mentioned housing portion having an inlet opening to the housing bore and to the vessel interior when the housing is mounted to the neck and an outlet, an axially extending main body mounted in the main bore first end portion, a main valve stem mounted to the housing for axial movement between a main valve open position and a main valve closed position, said valve stem extending within the housing bore second end portion and having an enlarged diametric end portion that has a terminal annular edge axially adjacent to the main body, the enlarged diameter cylindrical end portion having an axial bore, an annular main valve seat mounted in the enlarged diameter end portion and having an axial bore that has an inner peripheral surface, the main body including a reduced diameter portion having an annular groove opening radially to the valve seat inner peripheral surface, an axial intermediate portion in fluid sealing relationship with the housing, a second end portion axially opposite the reduced diameter end portion, a valving portion extending between the axial intermediate portion and the reduced diameter portion to provide an annular shoulder opening toward the main valve seat and axially spaced from the main valve seat and the enlarged diametric portion in the main valve closed position to provide an annular fluid chamber and in the valve stem closed position being abuttable against the main valve seat to block fluid flow from the chamber to the annular groove and an axial main body bore opening to the annular groove and to the outlet, the main valve stem having at least one annular shoulder opening axially opposite from said chamber, the housing bore having a bore portion surrounding the stem cylindrical portion to provide an annular clearance that that in both the valve stem open and closed position that has the inlet opening thereto, opens to the at least one annular shoulder and opens to said chamber.
Specification