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An Unusual Injector - Article by J L Townsend - News No. 143


Joined: 23-09-00

Topics: 1

Replies: 3

Posted: Fri 7th Dec 2012, 10:24am
An Unusual Injector - Article by J L Townsend - News No. 143

This injector appears to employ air valves develpoed by Doug Hewson in the 1980s. The additional air valve is to cut off air (containing oxygen)to help minimise corrosion, particularly useful for steel boilers. The novel construction is an interesting attempt to simplify construction.I have never used this type of valve in my injectors so I don't really know how effective they are. They are rather small in cross sectional area and have very limited lift, perhaps not that effective when dealing with steam pressures above say 80 to 90 psi. The efficiency of an injector should not be confused with its effectiveness. The efficiency is of little significance to model engineers, the effectiveness and reliability is everything! I hope this helps. Member No. 2945

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