Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
311 words
A non-refillable safety valve for a pressure container, which comprises: a. a housing, having a central bore, providing communication between a port and said pressure container for charging and selective discharging said pressure container, said central bore having a lower portion that is narrower than the upper portion of said central bore; b. a hollow knob unit, having a central bore, in threaded engagement with the outer wall of said housing; c. a core, having a central bore, slidably mounted in said central bore (a) of said housing, the upper end of said hollow knob unit being mounted on said core in a rotatable manner and in fixed longitudinal relationship with said core; d. a sealing member, which is slidably mounted in the lower end portion of said central bore (c) of said core, said core containing end stop means for preventing movement of said sealing member below the lower end of said core, said sealing member engaging the interface ledge formed by said lower portion and said upper portion of said central bore (a) when said core is moved the maximum possible distance into said central bore (c) or when refill is attempted after discharge of said pressure container, said core containing at least one passageway located in said core outwards from said sealing member for communication between said central bore (c) and said upper portion of said central core (a); and e. an engagable stop means, which is positioned between the outer surface of said housing and the inner surface of said hollow knob unit, for limiting retrograde or outward movement of said core to a position whereby said sealing member still engages said interface ledge when refilling said pressure container, said engagable stop means engaging after said pressure system has been filled and said sealing member, said core and said knob unit have been moved into sealing position.
Claim 2
Dependent Claim
311 words
A non-refillable safety valve for a pressure container, which comprises: a. a housing, having a central bore, providing communication between a port and said pressure container for charging and selective discharging said pressure container, said central bore having a lower portion that is narrower than the upper portion of said central bore; b. a hollow knob unit, having a central bore, in threaded engagement with the outer wall of said housing; c. a core, having a central bore, slidably mounted in said central bore (a) of said housing, the upper end of said hollow knob unit being mounted on said core in a rotatable manner and in fixed longitudinal relationship with said core; d. a sealing member, which is slidably mounted in the lower end portion of said central bore (c) of said core, said core containing end stop means for preventing movement of said sealing member below the lower end of said core, said sealing member engaging the interface ledge formed by said lower portion and said upper portion of said central bore (a) when said core is moved the maximum possible distance into said central bore (c) or when refill is attempted after discharge of said pressure container, said core containing at least one passageway located in said core outwards from said sealing member for communication between said central bore (c) and said upper portion of said central core (a); and e. an engagable stop means, which is positioned between the outer surface of said housing and the inner surface of said hollow knob unit, for limiting retrograde or outward movement of said core to a position whereby said sealing member still engages said interface ledge when refilling said pressure container, said engagable stop means engaging after said pressure system has been filled and said sealing member, said core and said knob unit have been moved into sealing position.
Claim 3
Dependent Claim
22 words
A non-refillable safety valve as claimed in claim 1 wherein a slidable sealing member is located between said housing and said core.
Claim 4
Dependent Claim
18 words
A non-refillable safety valve as claimed in claim 2 wherein said slidable sealing member is a resilient 0-ring.
Claim 5
Dependent Claim
19 words
A non-refillable safety valve as claimed in claim 1 wherein said core has two to eight of said passageways.
Claim 6
Dependent Claim
86 words
A non-refillable safety valve as claimed in claim 1 wherein said central bore (b) has a wider portion below where said knob unit threadably engages said housing, said engagable stop means is located inwardly from said wider portion of said central bore (b), when said valve is in the fill position, and said engageable stop means is a spring member that moves outwardly into said outer portion of said central bore (b) when said valve is in the sealing position after filling of said pressure container.