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Posted by Pete on July 26, 2002 at 20:50:13:
In Reply to: Boiler Blowdown posted by Cody Lawton on July 26, 2002 at 05:44:32:
The only time you would open the inside valve last and close it first is if you have seatless valves. This is to avoid compressing the water between the valves when closing the inside valve.
If the valve closest to the boiler is a quick-opening valve, it is not designed for throttling but for sealing so it should be opened first and closed last. In any case, the same valve should always be used for throttling so it is taking the wear; you will then always be assured that you have one good valve that will always hold.