Safety Isolation Valve
This valve acts in the same way as an electrical fuse or magnetic circuit breaker does in an electrical circuit. An electrical fuse will blow and a magnetic circuit breaker will trip when a certain current is reached. Similarly, if the flow of the water goes too high the SIV closes off at a predetermined safe slow rate. The SIV differs from its electrical counterpart in that, when it closes, it arrests the flow of water rapidly and then shuts of slowly. This feature is necessary to stop the increase of flow quickly to prevent run away conditions and then stop the flow slowly to prevent hydraulic shock loads and slow down the water in the pipe upstream of the valve at a controlled rate. If the valve does not close slowly it will cause a high-pressure surge. The pipe may be overloaded to the point of failing.
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