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Posted by Steamer on June 11, 2005 at 08:38:16:
In Reply to: boiler vacumm posted by mikey on March 04, 2005 at 10:03:09:
Regarding your problem, yes the boilers cool at night and the condensation of steam present in the drum will form vacuum that draughs the water.
You do not need to install extra solenoide valves or adjust the level in the tank. The objectives you need to fulfill are;
- break the vacuum in the boiler
- prevent water from entering by gravity.
To solve the problem I advise you to install a vacuum breaker and a air vent on the boiler drum. This will solve two problems:
- First will let air in to breal the vaccum and
- Secondly and more important it will release the air on start-up speeding up the process and reducing the possibility of corrosion on steam system.
To solve the problem of the water draught even if you have an elevated condensate tank, please note tha breaking the vacuum will not stop the water, I advise you to install a disc check valve with a loaded spring and epdm seal just after the pump outlet connection. This check valve will prevent water from going in the boiler when pump is stoped and boiler is without pressure.
This solution was presented to me by Spirax Sarco with excelent results ask them for the DCV2B / AVC32 and VB21.
You can learn it by yourself on http://www.spiraxsarco.com/learn.
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