| 摘要 |
A vibration responsive gas shut-off valve assembly which is highly effective in conditions which give rise to excessive vibration such as earthquakes and the like. The shut-off valve assembly is inserted into a gas line leading from a source of gas to an interior of a building such a dwelling structure. The valve assembly comprises a spherically shaped ball which may be located within the gas line and which contains a gas passage channel extending therethrough. When the Mall is in a first position, gas will flow from one side of the ball through the channel and to the other side of the ball in the gas line. When the ball is in a second position, the channel is located so that one side is vented through an orifice in the pipe and the other side is in communication with the downstream side of the pipe such that gas in the downstream side of the pipe leading to the building can be vented. A control mechanism is provided to cause the valve to remain in the normally open position but which trips in response to vibration and causes the ball to rotate thereby effectively closing the valve.
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