Pond heating Air vents |
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| Air vents should be fitted on the highest point possible on both the suction and discharge side of the pump. | |
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This photo shows the air vents as fitted to Mark's system. The vents are usually supplied for 15mm pipe so a reducer is required from 22mm. |
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This shows one of the vents before it was fitted. When the system is fully operational the small cap is screwed down and is sealed by the rubber joint that is inside the cap. Any air in the system will rise to the top of the pipe, and can then be released by slackening back the cap until all the air is expelled, and only water comes out in the same way as bleeding a radiator in your home. |
| There is another type similar to this called an automatic vent valve. With this the rubber washer is replaced by a fibre washer. The top is screwed down lightly, and when there is water present then the fibre expands and seals the valve. When air is present then the fibre washer dries out and allows the air to escape. This type is fitted to many domestic central heating boilers, but has the disadvantage of small amounts of water leaking at times and with such a small system as this it can cause problems. |
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