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When the boiler main isolating valve (commonly called the ‘crown’ valve) is opened, steam immediately passes from the boiler into and along the steam mains to the points at lower pressure. The pipework is initially cooler than the steam, so heat is transferred from the steam to the pipe.
Get PriceNote that for two-port steam valves, differential pressure should be taken as the upstream absolute steam pressure; whereas for two-port water valves it will be the maximum pump gauge pressure minus the pressure loss along the pipe between the pump and the valve inlet. Example 7.1.1
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