Gas valve

Claim 2

A valve means for closing a pressurized gas line when there is a sudden change in pressure of a substantial amount in the gas line, said valve means comprising: a. body means for mounting intermediate the gas line, said body means having first and second passageways and an internal cavity for allowing gas to pass therethrough; b. flexible diaphragm means mounted in said internal cavity of said body means for dividing said internal cavity into first and second portions; c. first equalization means located between said first and second portions of said internal cavity for allowing restricted equalization of slow pressure change between said first and second portions of said internal cavity; d. first and second flap means mounted in said first portion of said internal cavity for movement between first positions away from said first and second passageways to allow gas to flow through said valve means and second positions adjacent said first and second passageways to prevent gas from flowing through said valve means; e. activating means mounted on said disphragm means for causing said first and second flap means to move from said first positions to said second positions when the pressure in said first portion of said internal cavity suddenly changes a substantial amount causing said diaphragm to dilate.

Claim 3

The valve means of claim 1 in which said activating means includes plunger means attached to said diaphragm means for causing said first and second flap means to move from said first positions to said second positions when the pressure in said first portion of said internal cavity suddenly drops a substantial amount causing said diaphragm means to extend into said first portion of said internal cavity.

Claim 4

The valve of claim 1 in which said activating means includes bracket means attached to said diaphragm means for causing said first and second flap means to move from said first positions to said second positions when the pressure in said first portion of said internal cavity suddenly increases a substantial amount causing said diaphragm means to extend into said second portion of said internal cavity.

Claim 5

The valve means of claim 1 in which said first and second flap means include magnetic means for coacting with said body means to substantially hold said first and second flap means in said first positions.

Claim 6

The valve means of claim 4 in which said first and second flap means include spring means for urging said first and second flap means toward said second positions when the magnetic hold between said magnetic means of said first and second flap means and said body means is broken.

Claim 7

The valve means of claim 1 in which said first equalization means includes adjustable valve means for selectively adjusting the equalization of pressure change between said first and second portions of said internal cavity.

Claim 8

The valve means of claim 6 in which is included second equalization means located between said first and second passageways and said internal cavity for allowing selective equalization of pressure between the gas line and said internal cavity wheN said first and second flap means are in said second positions preventing the flow of gas through said valve means to allow said first and second flap means to be subsequently moved to said first positions for allowing the flow of gas through said valve means.

Claim 9

The valve means of claim 7 in which said second equalization means includes manual valve means for selectively allowing the equalization of pressure between the gas line and said internal cavity.

Claim 10

A valve means for closing a pressurized gas line when there is a sudden change in pressure of a substantial amount in the gas line, said valve means comprising: a. body means for mounting intermediate the gas line, said body means having first and second passageways for mounting to the gas line and having an internal cavity for allowing gas to pass therethrough; b. flexible diaphragm means mounted in said internal cavity of said body means for dividing said internal cavity into first and second portions; c. first equalization means located between said first and second portions of said internal cavity for allowing restricted equalization of slow pressure change between said first and second portions of said internal cavity; d. first and second flap means mounted in said first portion of said internal cavity for movement between first positions away from said first and second passageways to allow gas to flow through said cut-off valve means and second positions adjacent said first and second passageways to prevent gas from flowing through said valve means; e. plunger means attached to said diaphragm means for causing said first and second flap means to move from said first position to said second position when the pressure in said first portion of said internal cavity drops a substantial amount causing said diaphragm means to extend into said first portion of said internal cavity; and f. bracket means attached to said diaphragm means for causing said first and second flap means to move from the first positions to the second positions when the pressure in said first portion of said internal cavity suddenly increases a substantial amount causing said diaphragm means to extend into said second portion of said internal cavity.

Claim 11

A valve means for closing a pressurized gas line when there is a sudden change in pressure of a substantial amount in the gas line, said valve means comprising: a. body means for mounting intermediate the gas line, said body means having first and second passageways for mounting to the gas line and having an internal cavity for allowing gas to pass therethrough; b. flexible diaphragm means mounted in said internal cavity of said body means for dividing said internal cavity into first and second portions; c. first equalization means located between said first and second portions of said internal cavity for allowing restricted equalization of slow pressure change between said first and second portions of said internal cavity; d. first and second flap means mounted in said first portion of said internal cavity for movement between first positions away from said first and second passageways to allow gas to flow through said cut-off valve means and second positions adjacent said first and second passageways to prevent gas from flowing through said valve means; e. plunger means attached to said diaphragm means for causing said first and second flap means to move from said first position to said second position when the pressure in said first portion of said internal cavity drops a substantial amount causing said diaphragm means to extend into said first portion of said internal cavity; and f. bracket means attached to said diaphragm means for causing said first and second flap means to move from the first positions to the second positions when the pressure in said first portion of said internal cavity suddenly increases a substantial amount causing said diaphragm means to extend into said second portion of said internal cavity.

Claim 12

The valve means of claim 9 in which is included second equalization means located between said first and second passageways and said internal cavity for allowing selective equalization of pressure between the gas line and said internal cavity when said first and second flap means are in said second position preventing the flow of gas through said valve means to allow said first and second flap means to be subsequently moved to said first positions for allowing the flow of gas through said valve means.